Claims:WE CLAIM:

1. Present Improved Evaporative Air Cooling System For Public Conveyance Systems (P), mainly comprises of:
• Ventilating Assembly 1,
• Involute Assembly 2,
• Centrifugal fan Assembly 3,
• Water distribution Assembly 4,
• Honeycomb pads and Filters Assembly 5,
• Controller Assembly 6,
• Housing Assembly 7;

wherein;

said Ventilating Assembly 1 is provided for uniformly distributing fresh, filtered and cooled air from the present evaporative cooling system throughout the train car or coach; said Ventilating Assembly 1 is further comprised of:

• air outlet grills 16,
• Ducts 36;

said air outlet grills 16 is provided for delivering the cool filtered air to the passengers sitting inside the coach and said ducts 36 includes but does not limits to the use of standard duct system selected depending upon the size of the coach and the space available in the coach, also said air outlet grills 16 and Ducts 36 includes but does not limits to the use of standard duct and air grill systems;

said Involute Assembly 2 is provided for housing the centrifugal fan17 and further for providing motive drive to said centrifugal fan17, which is further comprised of:

• Angle bar 18,
• Involute 19,
• Motor mounting plate 20,
• Electric motor 21,
• Motor pulley 22,
• V belt 24;

said Electric motor 21 is located over the involute 19 and is mounted on the motor mounting plate 20, wherein said angle Bar 18 is attached to the motor mounting plate 20; said electric motor 21 is provided to drive said centrifugal fan 17, wherein said centrifugal fan 17 is connected to the electric motor 21 through the said motor pulley 22 through v belt 24;

said Centrifugal Fan Assembly 3 is delivery; said centrifugal fan assembly 3 further comprises of:

• Centrifugal fan 17,
• Centrifugal fan pulley 23,
• Shaft 25;

said centrifugal fan 17 is placed between the said cooling pads 26 and is further connected to an electric motor 21through a pulley system consisting of a motor pulley 22 and a centrifugal fan pulley 23 and through v belt 24, wherein said centrifugal fan assembly3 along with involute shaped air guide is mounted within the housing assembly 7; said centrifugal fan 17 sucks fresh air which passes through the cooling pads 26 for washing and evaporative cooling of the air and such cool filtered air is then delivered to the passenger sitting or resting areas of the coach through duct 36 and air outlet grills 1; said centrifugal Fan 17 is mounted on the shaft 25 and shaft 25 is further connected to the centrifugal fan pulley 23 directly and to the centrifugal fan pulley 23 and electric motor 21 connected through v belt 24;

said Water Distribution Assembly 4 is provided for distribution of water on the cooling pads of the evaporative air cooler 32 and is further comprised of:

• Water Distribution system 27,
• Internal Water tank 28,
• External water tank 29,
• External water pump 30,
• Internal water pump 31,
• Water level sensor 37,
• Water inlet pipe 38;

said internal water tank 28 is connected through an automatic fill device and water inlet pipe 38 to an external water pump 30 ,further external water tank 29 is the bigger water tank and is mounted below the coach or car which can be easily refilled at the major stations (platforms); said external water pump 30 is connected with external water tank 29 through water inlet pipe 38 and switches ON and OFF according to the water requirement of the individual air cooler’s tank which is further monitored by the said water level sensors 37; the water is circulated through said evaporative air cooler 32 by means of the internal water pump 31 and is pumped up from the internal water tank 28 located at the base of the cooler body 32, wherein said internal water pump 31 is connected to water distribution system 27, which is provided for distributing water on the cooling pad 26; said external water pump 30 is connected to connecting means that provide electric supply to said external water pump 30; the water level sensor 37 is mounted in internal water tank 28 said evaporative air cooler 32 further comprises of an inlet air mixing compartment provided in the upper part of the car or coach for receiving air from within the passenger compartment and also simultaneously receiving fresh air from the exterior of said car or coach, further each individual evaporative air cooler 32 comprises of a small internal water tank 28 for water distribution over said cooling pads 26 through internal water pump 31 in the individual cooler, wherein all individual air coolers are connected by a piping system to an external water tank 29 located below the compartment; further the piping between external water tank 29 and individual air cooler’s internal water tank 28 are connected using a system of water level sensors 37 in each individual air cooler and a controller 8 that ensures automatic refilling of said internal water tank 28 from the external water tank 29 as and when required and thereby eliminates manual water filling of the individual air coolers;

said Honeycomb Pads and Filters Assembly 5 are provided to filter out coarse dust and suspended particles from the air for washing and evaporative cooling of the air and thereby provides fresh filtered cooled air to the passengers sitting in the coach or car, further said evaporative air cooler 32 "Displaces" the heat out instead of "Pulling" the heat out and there by provides fresh air throughout it operation; said honey comb pad and filter assembly 5 further comprises of:

• Cooling pad 26,
• Filters 39;

said cooling pads 26 are provided for washing and cooling of the air, wherein thickness of cooling pad 26, air velocity across the cooling pad 26, and water flow through the pad, are so adjusted so as to wash the air thoroughly and remove most of the particular matter and ensure complete filtration of the air and also provides optimised cooling efficiency; said filters 39 are provided for filtering of the cooled air and ensures that the air delivered through the present system is fresh and filtered;

said Controller Assembly 6 is provided to control the automatic refilling system of water from external water tank 29 to the individual cooler water tanks and is further comprised of Controller 8 ; said controller senses the inputs from the said water level sensor 37 and sends signal to the external water pump 30 to supply water to the internal water tank 28, controller 8 stops the external water pump 30 when the internal water tank 28 is filled up;

said Housing Assembly 7 is provided for structural housing of the present Improved evaporative air cooling system for public conveyance system (P), which is further comprised of:
• Top panel 33;
• Front plate 34,
• Bottom plate 35;
•
wherein further centrifugal fan assembly 3 having involute shaped air guide is mounted on the said housing assembly 7; said bottom plate 35 is of Ms sheet or optionally a structure consisting of c channels or i beams, further said external water tank 29 is mounted below the coach chassis and the internal water tank 28 is mounted in the said housing assembly;

said passenger vehicle train 10 in the present Improved evaporative air cooling system for public conveyance system (P), is a railway car or coach having at each end: a lavatory or smoking compartment, a toilet 11, a vestibule and a passage or corridor 12 extending from the end of the car or coach alongside the toilet and lavatory compartments into the passenger compartment 13 inwardly of the lavatory; said corridor or passage is separated from the vestibule by the usual door and partition 14; further the top side of said passenger vehicle train 10 comprises of:
• Outer wall,
• Inner wall; 9

said outer wall extends continuously over the top of the passenger vehicle train 10 and forms the roof 15 with said inner wall 9 of the said passenger vehicle train 10, wherein air ducts are provided for the ventilating of the present system, and are mounted on the inner wall 9.

2. Present Improved Evaporative Air Cooling System for Public Conveyance Systems (P) as claimed in claim 1, wherein said controller8 controls the system and automatically refills said internal water tank 28 from the said external water tank 29 by receiving the signals from the water level sensors 37, which provides automatic refilling of said internal water tank 28.

3. Present Improved Evaporative Air Cooling System For Public Conveyance Systems (P) as claimed in claim 1 and claim 2, wherein said Housing assembly 7 and it`s component parts are constructed using, polymers that are processed using technology such as injection moulding, compression moulding, roto-moulding, cast moulding, or optionally constructed using ferrous material sheets, or non-ferrous material sheets using combination of machining and stamping, forging, bending and other alike operations.

4. Present Improved Evaporative Air Cooling System For Public Conveyance Systems (P) as claimed in claim 1 to claim 3, wherein said evaporative air cooler 32 comprises of an inlet air mixing compartment which is located in the upper part of the car or coach and is provided for receiving of the air from within the passenger car or coach and also for simultaneously receiving fresh air from the exterior of passenger car or coach.

5. Present Improved Evaporative Air Cooling System For Public Conveyance Systems (P) as claimed in claim 1 to claim 4, wherein said evaporative air cooler 32, the air delivery is so calculated and achieved that it ensures sufficient air change in the compartment preferably 10 to 30 air changes per hour depending upon application and heat load and weather conditions to ensure proper ventilation, and, to maintain positive pressure and dust free environment inside the compartment or coach and provide fresh filtered air.

Dated this 10th day of May, 2017.

Gopi J Trivedi. (Ms)
Authorized Agent of Applicant

To,
The Controller of Patents,
The Patent Office,
Mumbai

, Description:FORM – 2

THE PATENTS ACT, 1970
(39 of 1970)

COMPLETE SPECIFICATION
(SECTION 10; RULE 13)

“AN IMPROVED EVAPORATIVE AIR COOLING SYSTEM FOR PUBLIC CONVEYANCE SYSTEMS”

Symphony Limited,
A Company Incorporated under the Indian Companies Act
having address at
Symphony house FP-12-TP-50 Bodakdev, Off S. G. Highway, Ahmedabad, Gujarat, India-380054

The following specification particularly describes the invention and the manner in which it is to be performed: -

FIELD OF THE INVENTION

The present invention relates to an improved evaporative air cooling system for public conveyance system, such as for a railway coach. Particularly, the present invention further relates to a Improved evaporative air cooling system for public conveyance system that is Improved and that eliminates the user intervention for regular water filling to individual air coolers.

BACKGROUND AND THE PRIOR ART

An evaporative cooler (also swamp cooler, desert cooler and wet air cooler) is a device that cools air through the evaporation of water. Evaporative cooling differs from typical air conditioning systems, which use vapor-compression or absorption refrigeration cycles. Evaporative cooling works by exploiting water's large enthalpy of vaporization. The temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor (evaporation). This can cool air using much less energy than refrigeration. In extremely dry climates, evaporative cooling of air has the added benefit of conditioning the air with more moisture for the comfort of building occupants. Typically, such coolers are used for residential installation or for industrial installation.

Till Date, the railway coaches are either air conditioned (using refrigeration technology) or simply fan cooled. So far, evaporative air cooling has never been attempted for railway coaches, because of several complications involved in implementing of evaporative air cooling system for such moving vehicles and especially for the vehicles which are meant for public conveyance, wherein said complications are involved which are:

• Water management complications: As the space available in the compartment is small, the problem occurs on where and how the water should be stored, refilled between two major stations so as to suffice the evaporative system with water throughout it’s operation.

• Placing of the Evaporative air cooling system: The problem arises as to where to locate the evaporative air cooling system as the height below the roof is almost completely used by the passengers and above the roof there is very small gap between the roof and electric wires for traction.

• Ventilation of the Evaporative air cooling systems: The problem arises as to where and how to provide ventilating system necessary for the evaporative air cooling systems.

• Distribution of the cooled air: the problem arises as to how to distribute the cooled air through evaporative air cooling system to the different compartments, ensuring the ease in working of the evaporative air cooling systems.

• Control of the system: The problem arises as to how to provide improved operation of the system such as automatic refilling of water from main tank to cooling tank.

Several attempts are made to develop evaporative air cooling systems with time tested technology in varying size shape capacity and functions yet none provides the solution to the above mentioned problems.

US5285654 A describes a roof mounted evaporative air cooler for which the sole supply of water is the low profile water container on the roof of the vehicle. In such product, the capacity of water container is limited, one can’t have too much weight on the top of the vehicle, and else it will be unstable during sharp turns at medium to high speeds. Hence, frequent filling of water is necessary. As a result, this has never been applied for largely unattended vehicles for public conveyance such as railway coaches.

US6684658 B2 describes a cooling system based upon vapour compression cycle (refrigeration cycle) using water as a medium in compressors. This is neither a direct evaporation cooling, nor it has an application for cooling of any running vehicle. Said invention is a utility model based upon adiabatic cooling cycle and not based upon refrigeration cycle. Adiabatic cooling cycle needs far less moving components as against refrigeration cycle and hence much easy for operation and maintenance.

Also, the prior art as described in US6684658 B2 works on a vapour compression cycle with a salt concentrated water where the moisture in air is first sucked by the salt and then such dry air is further cooled. This prior art refers to a very complicated multi-stage cooling method which has a very large size for a given air delivery quantity, and, is surely meant for a stationary space cooling applications only, and, certainly not applicable to the running vehicles.

US3583174 A describes an evaporative air cooling apparatus in which the air naturally passes over the porous cylindrical wetted pad and gets evaporatively cooled. In this case, there is no mechanised means of air blowing and the flow of air depends purely upon the convection currents. Such a system can never keep the cooled space (for example car cabin) in a positive pressure, and, hence, can’t ensure dust free fresh filtered air all the time. The apparatus cited in this prior art can only allow drop of air temperature in vicinity of the porous wetted media. That is the reason that this prior art has never been applied practically to any vehicle cooling, let apart cooling of the big cabins like railway coaches. Also, the apparatus as per this prior art is intended to use for re-circulating the air within the space, hence, does not offer fresh air supply.

US5857350 A refers to an evaporative air cooling system which is designed and conceived for use on wide open playing / sport fields or in open sided warehouses or work stations. A smaller size version of that prior art is intended for use in semi-confined areas such as verandas, patios, lanais, porches etc. Or, temporarily delivery cooled air to confined spaces such as attics in a house. The apparatus of this prior art has no utility for a running vehicle, where much different construction and technological interventions are desired to make the idea of evaporative air cooling work.

US4031710 A refers to the prior art for a vehicle air cooling system in which the condenser of a refrigeration cycle based air conditioner is cooled through water by evaporative cooling. Here, the vehicle cabin is still cooled by refrigeration cooling cycle (typical air conditioning), the water evaporative cooling is a secondary cooling used for cooling the condensor for refrigerant air conditioner. The air in the vehicle is not cooled by evaporative cooling method. In this prior art, the energy consumption for air cooling is quite high because the air is cooled through a refrigerant cycle (based upon compressor, condensor, expansion valve/capillary, and, radiator/evaporator) and also suffers from the disadvantage that they use polluting greenhouse gases as refrigerant media.

DISADVANTAGES OF THE PRIOR ART:

Different evaporative cooling systems for public conveyance systems developed and available in the market suffers from all or at least one of the following disadvantages:
• They fail to provide applicability of cooling to moving vehicles.
• Many of them are based on concept of air conditioners and work on refrigeration cycle which:
o has very high energy consumption,
o uses environment polluting greenhouse gases as refrigerant or cooling medium.
o air quality in the coach is often not fresh and pure. Often, the air is stale, smelly and unhealthy leading to what is commonly known as sick building syndrome.
o does provide cooling of the coach, but in the process liberate substantial heat to the atmosphere thereby leading to direct heating of the atmosphere.
• Many of them work on natural convection based porous wetted media for evaporative cooling of air. Such evaporative cooling of air can drop temperature in the vicinity of the porous media, but cannot keep the entire space under positive pressure, thereby cannot cool entire space and also cannot ensure dust free fresh filtered cool air all the time.
• Fan cooled coaches do not provide sufficient cooling comfort in the coach, especially in hot temperature during summers. In fact, at most times, those are almost non-effective.
• They require a full time attendant for routine operation, thus is not Improved.
• Many of them are complicated in construction and thus difficult to maintain.
• Most of them are thus costly.
• Most of them are not robust and thus fail to be applicable in public conveyance systems like railways cars, vans, buses, truck cabins and the likes.
• Some of them require manual refilling system of water from main water storage tank to the individual cooler water tanks.
• Most of them are cumbersome to operate.

Thus, there is a need to provide an evaporative air cooling system for public conveyance systems.

OBJECTS OF THE INVENTION:

The main object of the present invention is to provide an improved evaporative air cooling system for public conveyance system, such as for a railway coach.

Another object of the present invention is to provide an improved evaporative air cooling system for public conveyance system, which has automatic refilling system of water from main water storage tank to the individual cooler water tanks.

Yet another object of the present invention is to provide an improved evaporative air cooling system for public conveyance system that eliminates the user intervention and functions as Improved for water filling to individual air coolers.

Yet another object of the present invention is to provide an improved evaporative air cooling system for public conveyance system that eliminates the use of environment polluting greenhouse gases as refrigerant or cooling medium.

Yet another object of the present invention is to provide an improved evaporative air cooling system for public conveyance systems that provides fresh and filtered air within the coach of railway or the internal area of any of the public conveyance systems and thus eliminates the risks of sick building syndrome.

Yet another object of the present invention is to provide an improved evaporative air cooling system for public conveyance systems which ensures fresh filtered cool air throughout its operation.

Yet another object of the present invention is to provide an improved evaporative air cooling system for public conveyance systems which provides effective cooling even at high outside temperature during summer.

Yet another object of the present invention is to provide an Improved evaporative air cooling system for public conveyance system which is preferably applied for railway coach and the principles of which can be commonly applied to other passenger vehicles, such as cars, vans, buses, truck cabins and the likes.

Yet another object of the present invention is to provide an Improved evaporative air cooling system for public conveyance system that has a provision of a new evaporative air cooling system for railway car or coach for distributing the fresh, filtered and cold comfortable air within the coach, supplying the required amount of fresh and filtered air to the passengers in the coach.

Yet another object of the present invention is to provide an improved evaporative air cooling system for public conveyance system that is simple in construction and easy to use yet efficient in operation.

Yet another object of the present invention is to provide an improved evaporative air cooling system for public conveyance system that eliminates the need for full time attendant especially for such system and provides improved water refilling to the cooler tank.

Yet another object of the present invention is to provide an improved evaporative air cooling system for public conveyance system that is robust.

Yet another object of the present invention is to provide an improved evaporative air cooling system for public conveyance system that has lesser power consumption to the currently used air conditioners in such public conveyance systems.

Yet another object of the present invention is to provide an improved evaporative air cooling system for public conveyance system that is significantly efficient.

Yet another object of the present invention is to provide an improved evaporative air cooling system for public conveyance system that is significantly eco-friendly.

Yet another object of the present invention is to provide an improved evaporative air cooling system for public conveyance system that provides ease in operation.

Yet another object of the present invention is to provide an improved evaporative air cooling system for public conveyance system that calls for less maintenance.

Yet another object of the present invention is to provide an improved evaporative air cooling system for public conveyance system that is economical.
SUMMARY OF THE INVENTION

An Improved evaporative air cooling system for public conveyance system, mainly comprises of centrifugal fan rotated using a motor; an air distribution means such as a duct for to deliver air and an evaporative cooling media (cooling pads) through which water is circulated using a system of pump and water distribution parts. The said centrifugal fan is located between the cooling pads and run by a motor with optional v belt and pulley system. Said centrifugal fan is housed in an involute shaped housing and encapsulated in the general structure consisting also of internal water storage tank. The water from the internal water storage tank is circulated using pump and water distribution system to, on and over the said evaporative cooling media. The centrifugal fan sucks fresh air and washes and filters the air thereby also evaporative cooling the air and such cool fresh filtered air is distributed uniformly within the coach or compartment through any standard system of ducts and air grills. And, the air quality and freshness is maintained through a set of ventilation window or optional exhaust fans normally installed in the train coach walls.

The present invention provides a novel evaporative air cooler which comprises of controller that controls the operation of refilling the water from external water storage tank of the compartment to individual air coolers internal water storage tanks in an improved manner.

The air cooler of the present invention is devolved to be used for the efficient cooling of train coach or car by suitable changes to the individual air cooler capacities.

BREIF DESCRIPTION OF DRAWINGS

Fig.1 : Shows a vertical section of one end of a railway car/coach taken on the line AA of Fig. 2, of present Improved Evaporative Air Cooling System For Public Conveyance Systems
Fig.2 : Shows horizontal section of one end of a railway car, a section being taken above the main duct and evaporative air cooling mechanism of the train car/coach, with sectional view of the parts drawn on the line BB of Fig. 1, of present Improved Evaporative Air Cooling System For Public Conveyance Systems
Fig.3 : Shows section C-C from Fig. 1, of present Improved Evaporative Air Cooling System For Public Conveyance Systems
Fig.4 : Shows isometric view of section C-C of Fig. 1, of present Improved Evaporative Air Cooling System For Public Conveyance Systems
Fig.5 : Shows isometric view of section D-D of Fig. 2, of present Improved Evaporative Air Cooling System For Public Conveyance Systems
Fig.6 : Shows exploded isometric view of section E-E of Fig. 2, of present Improved Evaporative Air Cooling System For Public Conveyance Systems
Fig. 7 : Shows different assemblies and parts of present Improved Evaporative Air Cooling System For Public Conveyance Systems

Meaning of Reference numerals of said component parts of present IMPROVED Evaporative Air Cooling System for Public Conveyance Systems:

P : Present Improved Evaporative Air Cooling System For Public Conveyance Systems.
1 : Ventilating Assembly
2 : Involute Assembly
3 : Centrifugal Fan Assembly
4 : Water Distribution Assembly
5 : Honey Comb Pads And Filters Assembly
6 : Controller Assembly
7 : Housing Assembly
8 : Controller
9 : Inner wall
10 : A Passenger Vehicle Train
11 : A Toilet
12 : A Vestibule And A Passage Or Corridor Extending From The End Of The Car/Coach Alongside The Toilet
13 : Lavatory Compartments Into The Passenger Compartment
14 : Partition
15 : The Roof
16 : Air Outlet Grills
17 : Centrifugal Fan
18 : Angle Bar
19 : Involute
20 : Motor Mounting Plate
21 : Electric Motor
22 : Motor Pulley
23 : Centrifugal Fan Pulley
24 : V Belt
25 : Shaft
26 : Cooling Pad
27 : Water Distribution System
28 : Internal Water Tank
29 : External Water Tank
30 : External Water Pump
31 : Internal Water Pump
32 : An Evaporative Air Cooler
33 : Top panel
34 : Front plate
35 : Bottom plate
36 : Ducts
37 : Water Level Sensor
38 : Water Inlet Pipe
39 : Filters
40 : Ventilation window or Optional exhaust fan

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to an improved evaporative air cooling system for public conveyance system (P), such as for a railway coach. An Improved evaporative air cooling system for public conveyance system (P), provides automatic refilling system of water from main water storage tank to the individual cooler water tanks. It further provides a compact unit structure which further is accommodated in the limited space available in railway coaches. It further ensures filtration, distribution and ventilation and thereby provides fresh and filtered air.

Referring to Fig.1 to Fig.7, the present improved evaporative air cooling system for public conveyance system (P), mainly comprises of:
• Ventilating Assembly 1
• Involute Assembly 2
• Centrifugal fan Assembly 3
• Water distribution Assembly 4
• Honeycomb pads and Filters Assembly 5
• Controller Assembly 6
• Housing Assembly 7

Wherein,

Said Ventilating Assembly 1 is provided for uniformly distributing fresh, filtered and cooled air from the present evaporative cooling system throughout the train car or coach Said Ventilation Assembly is further comprised of:
o air outlet grills 16
o Ducts 36

Said ventilating assembly 1 includes but does not limits to the use of standard ventilation system, air exhaust system and alike. Said air outlet grills 16 is provided for delivering the cool filtered air to the passengers sitting inside the coach. Said ducts 36 includes but does not limits to the use of standard duct system selected depending upon the size of the coach and the space available in the coach. Wherein said air outlet grills 16 and Ducts 36 includes but does not limits to the use of standard duct and air grill systems.

Said Involute Assembly 2 is provided for housing the centrifugal fan 17 and further for providing motive drive to said centrifugal fan. Said involute assembly 2 is further comprised of:
o Angle bar 18
o Involute 19
o Motor mounting plate 20
o Electric motor 21
o Motor pulley 22
o V belt 24;

Said Electric motor 21 is located over the involute 19 and is mounted on the motor mounting plate 20. Said angle Bar 18 is attached to the motor mounting plate 20. Said electric motor 21 is provided to drive the said centrifugal fan 17, wherein said centrifugal fan 17 is connected to the electric motor 21 through the said motor pulley 22 through v belt 24.

Said Centrifugal Fan Assembly 3 is provided for delivery of air through the system. Said centrifugal fan assembly 3 further comprises of:
o Centrifugal fan 17
o Centrifugal fan pulley 23
o Shaft 25

Said centrifugal fan 17 is placed between the said cooling pads 26 and is further connected to an electric motor 21through a pulley system consisting of a motor pulley 22 and a centrifugal fan pulley 23 and through v belt 24. Said centrifugal fan assembly along with involute shaped air guide is mounted within the housing assembly 7. Said centrifugal fan 17 sucks fresh air which passes through the cooling pads 26 for washing and evaporative cooling of the air and such cool filtered air is then delivered to the passenger sitting or resting areas of the coach through duct 36 and air outlet grills 16. Said centrifugal Fan 17 is mounted on the shaft 25. Said shaft 25 is connected to the centrifugal fan pulley 23 directly and the centrifugal fan pulley 23 and electric motor 21 connected through v belt 24.

Said Water Distribution Assembly 4 is provided for distribution of water on the cooling pads of the evaporative air cooler 32. Said water distribution assembly 4 is further comprised of:
o Water Distribution system 27
o Internal Water tank 28
o External water tank 29
o External water pump 30
o Internal water pump 31
o Water level sensor 37
o Water inlet pipe 38

Said internal water tank 28 is connected through an automatic fill device and water inlet pipe 38 to an external water pump 30. External water tank 29 is the bigger water tank mounted below the coach or car which can be easily refilled at the major stations (platforms). Said external water pump 30 is connected with external water tank 29 through water inlet pipe 38 and switches ON and OFF according to the water requirement of the individual air cooler’s tank which is further monitored by the said water level sensors 37. The water is circulated through said evaporative air cooler 32 by means of the internal water pump 31 and is pumped up from the internal water tank 28 located at the base of the evaporative air cooler 32body. Said internal water pump 31 is connected to water distribution system 27, which is provided for distributing water on the cooling pad 26. Said external water pump 30 is connected to connecting means that provide electric supply to said external water pump 30. The water level sensor 37 is mounted in internal water tank 28. Said evaporative air cooler 32 further comprises of an inlet air mixing compartment provided in the upper part of the car or coach for receiving air from within the passenger compartment and also simultaneously receiving a fresh air from the exterior of said car or coach, further each individual evaporative air cooler 32 comprises of a small internal water tank 28 for water distribution over said cooling pads 26 through internal water pump 31 in the individual cooler. All individual air coolers are also connected by a piping system to an external water tank 29 located below the compartment. Further the piping between External water tank 29 and individual air cooler’s internal water tank 28 are connected using a system of water level sensors 37 in each individual air cooler and a controller 8 that ensures automatic refilling of said internal water tank 28 from the external water tank 29 as and when required. Thereby eliminates manual water filling of the individual air coolers.

Said Honeycomb Pads and Filters Assembly 5 are provided to filter out coarse dust and suspended particles from the air and for washing and evaporative cooling of the air and thereby provide fresh filtered cooled air to the passengers sitting in the coach or car. Said evaporative air cooler 32 "Displaces" the heat out instead of "Pulling" the heat out and there by provides fresh air throughout it operation. Further for said evaporative air cooler 32, the air delivery is so calculated and achieved that it ensures sufficient air changes in the compartment more preferably 10 to 30 air changes per hour depending upon application and heat load and weather conditions to ensure proper ventilation, and, to maintain positive pressure and dust free environment inside the compartment or coach. Said honey comb pad and filter assembly 5 further comprises of:
o Cooling pad 26
o Filters 39

Wherein said cooling pads 26 are provided for washing and evaporative cooling of the air, wherein thickness of cooling pad 26, air velocity across the cooling pad 26, and water flow through the pad, are so adjusted so as to wash the air thoroughly and remove most of the particular matter and ensure complete filtration of the air and also provides optimised cooling efficiency. Said filters 39 are provided for filtering of the cooled air and ensures that the air delivered through the present system is fresh and filtered air.

Said Controller Assembly 6 is provided to control the automatic refilling system of water from external water tank 29 to the individual cooler water tanks. Said controller assembly further comprises of Controller 8. Said controller senses the inputs from the said water level sensors 37 and sends signal to the external water pump 30 to supply water to the internal water tank 28. The controller 8 stops the external water pump 30 when the internal water tank 28 is filled up.

Said Housing Assembly 7 is provided for structural housing of the present improved evaporative air cooling system for public conveyance system (P), which is further comprised of:
o Top panel 33
o Front plate 34
o Bottom plate 35

Wherein further involute shaped air guide is mounted on the said housing assembly 7. Said bottom plate 35 is of Ms sheet or optionally a structure consisting of c channels or i beams. Said external water tank 29 is mounted below the coach chassis and the internal water tank 28 is mounted in the said housing assembly. Said Housing assembly 7 and it`s component parts are constructed using, but not limited to use of polymers that are processed using technology more specifically using technology such as injection moulding, compression moulding, roto-moulding, cast moulding, or optionally constructed using ferrous material sheets, or non-ferrous material sheets using combination of machining and stamping, forging, bending and other alike operations.

Said passenger vehicle train 10 in the present Improved evaporative air cooling system for public conveyance system (P), is a railway car or coach having at each end: a lavatory or smoking compartment, a toilet 11, a vestibule and a passage or corridor 12 extending from the end of the car or coach alongside the toilet and lavatory compartments into the passenger compartment 13 inwardly of the lavatory. Said corridor or passage is separated from the vestibule by the usual door and partition 14. Further the top side of said passenger vehicle train 10 comprises of:
• Outer wall,
• Inner wall; 9

Said outer wall extends continuously over the top of the passenger vehicle train 10 and forms the roof 15 with said inner wall 9 of the said passenger vehicle train 10. Air ducts are provided for the ventilating of the present system, and are mounted on the inner wall.

The parts of the railway coach that are shown herewith, are only for reference and they are not the part of present invention. The design and detailing of the railway coach will vary from one coach type to the other and is subject to continuous improvement and changes by the railway authorities. However, the present invention shall be applicable to the railway coaches, irrespective of its evolving design.

WORKING OF THE INVENTION:

Referring to Fig.1 to Fig.7 the working of the present improved evaporative air cooling system for public conveyance system (P) is best performed by following steps:

Step: 1 Air suction is provided for an evaporative air cooler 32 mounted on Front plate 34. Said centrifugal fan 17 sucks fresh air generated by the evaporation air cooler 32. The centrifugal fan 17 sucks fresh air which passes through the cooling pads 26 for washing and passes through the filters 39, wherein the air is filtrated and such cool filtered air is further delivered to the passenger sitting or resting areas of the coach through duct 36 and air outlet grills 16.

Step: 2 further the cooled fresh and filtered air is transferred to the air distribution duct 36 and is distributed in the train car or coach through air outlet grills 16.

Step: 3 the water is circulated using internal water pump 31 and water distribution system27 over the said evaporative cooling pads 26. The ventilation windows - with optional provision 40 for exhaust fans are suitably located on the ceiling of the coach. Further the internal water tank 28 is automatically refilled from the said external water tank 29 through said controller 8. Said water level sensor 37 senses the water level in the internal water tank 28 and further sends the signal to the controller 8. Further controller 8 signals the external water pump 30 to supply the water to the internal water tank 28 and upon refiling of said internal water tank 28 controller 8 sends stop signal to the external water pump 30.

Having described what is considered the best form presently contemplated for embodying the present invention, various alterations, modifications, and/or alternative applications of the invention for any system will be promptly apparent to those skilled in the art. Therefore, it is to be understood that the present invention is not limited to the practical aspects of the actual preferred embodiments hereby described and that any such modifications and variations must be considered as being within the spirit and the scope of the invention, as described in the above description.

Advantages of the current invention:

The present invention has many advantages over the prior art:

• The present invention provides the automatic refilling of the water in the internal water tank from the external water tank, that is refilled at major stations and thus eliminates the manual intervention in refilling of the internal water tank and thus provides improved evaporative air cooling system.
• Said invention uses water as a medium, and thereby provides an environment friendly, non-polluting cooling solution.
• Said invention does not uses any greenhouse gases for cooling and thus eliminates risk of leakage of greenhouse gases that lead to the global warming phenomenon.
• The evaporative air cooling system in coach of the present invention provides fresh and filtered air. Thus provides much better indoor air quality for the passengers.
• Capital investment costs for individual coach is lower for evaporative air cooling system.
• Said invention can be easily fitted to existing coaches also
• Evaporative air cooling system of the present invention has much lower power consumption for individual coaches of the railway thereby the operating costs are much lower.
• Maintenance costs are much lower in evaporative air cooling system since there are very few moving parts.
• Said invention provides a system of evaporative air coolers which can be installed with any standard and suitable duct system for individual air coolers depending upon the space available in the coach - and coupled with the standard available exhausts for ventilation in the coach - to ensure uniform distribution of fresh air within all passenger sitting or rest areas in the compartment.
• Said invention does not generate and throw any heat in the outer atmosphere. Hence, the surroundings of coach - while train is parked on the platform - will not be hot or uncomfortable.