FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. TITLE OF THE INVENTION
"COMPRESSOR-LESS AIR CONDITIONING SYSTEM FOR LIQUIFIED NATURAL GAS (LNG) VEHICLE AND METHOD OF CONSTRUCTION THEREOF"
2. APPLICANT
VE COMMERCIAL VEHICLES LTD., An Indian National having its place of business at 102, INDUSTRIAL AREA NO.1, PITHAMPUR-454775, DIST. DHAR, MADHYA PRADESH, INDIA
3. PREAMBLE OFTHE DESCRIPTION
The following specification particularly describes the nature of the invention and the manner in which it is to be performed

[oo1] The present subject matter relates to compressor-less air conditioning system for LNG (liquefied natural gas) vehicle and method of construction thereof.
[002] The LNG vehicle used a specialized storage tank called as LNG tank, which used to store liquefied natural gas at a very low temperature > - (minus)16o°C. This cryogenic fuel stored in LNG tank is supplied to LNG vaporizer, which is a type of heat exchangerfor regasification and then this gas goes to engine. The pipe connecting LNG tank and vaporizer has a surface temperature of around -1oo°C and this pipe is exposed to atmosphere resultant wastage of energy. Generally the existing air conditioner operate by using engine powerto drive the compressor, which costs high fuel consumption, maintenance cost and sometimes high operating cost.
[003] Hence there is an unmet need of system to utilize waste cooling energy from the LNG (liquefied natural gas) fuel lines with the help of heat exchanger and the electric pump driving ethanol flow through evaporator and exchanges this cooling with hot air coming from the blower which is then circulated to the cabin for providing air-conditioning effect to operate the air conditioning.
[004] The present subject solves the aforementioned and other problems by providing a system and method for developing the air conditioning system without using the engine or battery power unit for LNG type vehicle and eliminates the high-cost component like compressor, condenser and throttling valve, therefore a low-cost solution for Air conditioning system in LNG vehicles. This type of air conditioning system is only limited to LNG vehicles because of the availability of LNG tank. LNG tank stores liquefied natural gas at a very low temperature (-160 °C) and because its liquidity in nature, the energy density of LNG is greaterthan CNG.
[005] In another embodiment, the present subject matter discloses a cost-effective air conditioning system for liquefied natural gas vehicle comprising a storage system to store liquefied natural gas at a very low temperature of > - (minus) i6o°C, a liquefied natural gas vaporizer, act as heat exchanger for regasification, an electric pump and an evaporator. The said cost-effective air conditioning system for liquefied natural gas (LNG) vehicle is devoid of battery power unit, compressor, condenser and throttling device, etc. Further in the system of present subject matter

the heat recovery is being done through ethanol, which act as working fluid to maintain the low temperature of > - (minus) 16o°C in the system. Here the electric pump drive working fluid ethanol in internal heat exchangerand evaporator with blower.
[006] In another embodiment, the present subject matter discloses a method for construction of cost-effective air conditioning system for liquefied natural gas vehicle comprising a steps of flowing of low temperature liquefied natural gas from liquefied natural gas (LNG) tank to liquefied natural gas Vaporizer has a temperature of around -160 degree Celsius. Furtherflowing of low temperature liquefied natural gas through internal heat exchanger which exchanges this low temperature energy with Ethanol (working fluid); and then it flow to vaporizer and engine finally, wherein said cost-effective air conditioning system for liquefied natural gas vehicle is devoid of battery power unit, compressor, condenser and throttling device, etc.
[007] Though the present subject matter utilizing waste cooling energy from the LNG fuel-lines with the help of heat exchanger and the electric pump driving ethanol flow through evaporator and exchanges this cooling with hot air coming from the blower, which is then circulated to the cabin for providing air-conditioning effect. Hence, it provide a system to utilize this low temperature energy for cooling application in air conditioning system in vehicle. This leads to conservation of energy and reduces fuel consumption of LNG vehicle by eliminating power consumption of HVAC system from engine.
[008] In one embodiment, the present subject matter discloses an air conditioning system operates without using engine or battery power in LNG vehicle, thereby saving of huge energy lost in pipe between LNG tank and vaporizer due to direct contact of-160 oC Fuel and ambient. It also elimination of high cost components of air conditioning system like AC compressor, condenser and throttle valve. It is a low cost solution for air conditioning system in LNG driven vehicle.
[009] In another embodiment, it also reduce the weight of complete Air conditioning system and improves payload capacity of commercial vehicle driven by LNG fuel.

[oo1o] The present subject matter discloses an air conditioning system,
wherein air conditioning system operates by utilizing low surface temperature of LNG fuel pipes(-1oo degree C) coming from LNG fuel tank. The ethanol is being selected as a working fluid forthis system because of its most favorable properties forthis kind of AC system and also because of its easy availability in market. Other working fluids can also be used, however easy availability will be the constraint. This system is applicable to LNG driven vehicle only.
[0011] The air conditioning system of present subject matter, applicable
for LNG vehicle only, utilize low temperature energy from LNG fuel system. This system recovers low temperature energy which is getting wasted to ambient by using internal heat exchanger. In present subject matter, the system used ethanol as a working fluid to recover this energy and supplies to evaporator to exchange heat with hot air converting it to low temperature air. This lowtemperature air is circulated to cabin with the help of blower for providing air conditioning effect. This system does not require AC compressor, condenser and throttling device like conventional AC system. Hence it is a unique air conditioning system for LNG vehicle. This system works by utilizing waste cooling energy from LNG fuel lines with the help of internal heat exchanger and ethanol as a working fluid.
[0012] The system of present subject matter comprising electric pump and
evaporator as an essential components and eliminates the use of AC compressor, condenser and throttling device. In contrast to present subject matter, the conventional air conditioning system used in vehicle involves large number of working components such as compressor, condenser, throttling device, etc. However involvement of these major components results in higher operating cost and high power consumption. This also require high maintenance cost also. This conventional AC system results more fuel consumption in vehicle to provide driver comfort. In order to cope up this fuel consumption penalty in vehicle, an innovative approach has been followed to avoid fuel penalty in LNG driven vehicle due to air conditioning system by utilizing lowtemperature energy in LNG fuel lines which is lost to ambient. This results in energy conservation and improves fuel economy of vehicle by avoiding large fuel consumption in AC system. This system also requires

only two major components i.e. electric pump to drive working fluid ethanol, internal heat exchanger and evaporator with blower. This is very low cost solution for air conditioning system.
[0013] In another embodiment, the present subject matter discloses
system flow, wherein the low temperature liquefied natural gas flowing from LNG tank to LNG Vaporizer has a temperature of around -160 degree Celsius and the pipe surface temperature is around -100 degree Celsius which is exposed to ambient. This low temperature LNG is allowed to flow through Internal Heat Exchanger which exchanges this low temperature energy with Ethanol (working fluid) which has suitable properties for this application. The LNG fuel after exchanging heat with ethanol through Internal heat Exchanger flows to Vaporizer and then to engine. This low temperature ethanol from heat exchanger is supplied to evaporator with the help of electric pump driving ethanol. The ethanol flows through evaporator and exchanges this cooling with hot air coming from blower which is then circulated to cabin for providing air conditioning effect. The ethanol after coming out from evaporator goes to ethanol reservoir and recirculated for continuous operation.
[0014] It is to be understood that other embodiments of the present
disclosure will become readily apparent to those skilled in the art from the following detailed description, wherein it is shown and described only various embodiments of the disclosure by way of illustration. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
BRIEF DESCRIPTION OF DRAWINGS
[0015] Aspects of the present disclosure are illustrated by way of
example(s), and not by way of limitation, in the accompanying drawings, wherein:
[0016] FIG. 1 is an outline diagram of compressor-less air conditioning
system for LNG.
[0017] FIG. 2 is a system flow diagram of compressor-less air conditioning
system for LNG, as disclosed in FIG. 1

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
[0018] The present disclosure relates generally to compressor-less air
conditioning system for LNG.
[0019] Referring to FIG. 1 illustrated skeleton diagram of compressor-less
air conditioning system for LNG fuel in LNG fuel tank is stored in cryogenic temperature i.e. around -162 degree C. This LNG fuel is supplied to LNG vaporizer through steel pipes. This steel pipe carrying LNG fuel has surface temperature of around -100 degree C and is lost to environment. Hence, in order to utilize this low temperature heat energy coming out from steel pipes, we have used an innovative approach of using a heat exchanger device which is of coaxial tube type as shown in FIG. 1. The cost-effective air conditioning system for liquefied natural gas vehicle comprising a storage system to store liquefied natural gas at a very low temperature of > - (minus) i6o°C, a liquefied natural gas vaporizer, act as heat exchangerfor regasification, an electric pump and an evaporator. The said cost-effective air conditioning system for liquefied natural gas (LNG) vehicle is devoid of battery power unit, compressor, condenser and throttling device, etc. Further in the system of present subject matterthe heat recovery is being done through ethanol, which act as working fluid to maintain the low temperature of > - (minus) i6o°C in the system. Here the electric pump drive working fluid ethanol in internal heat exchanger and evaporator with blower.
[0020] The working fluid Ethanol is used to extract low temperature
energy from the surface of Steel pipes carrying LNG fuel. The Connector End-2 shown in image above is connected to LNG fuel tank. The LNG fuel enters from this connector end, flows through this heat exchangertube and exits from connecter end-3. The AC working fluid "Ethanol" stored in reservoir enters into connector end-i and flows over outer surface of LNG flowing pipe which is having surface temperature of around -100 degree C. In this way, this ethanol fluid extracts this low temperature energy from the pipe surface and exits from connector end-4. which is connected to AC evaporator. The evaporator which is again a heat exchanger helps in reducing the temperature of air coming from blower. This cold air then enters to

the vehicle cabin providing air conditioning effect. In this way the cycle continues. This system uses electric pumpforflowing the working fluid "ethanol". The conventional air conditioning system used in vehicle generally uses engine powerto drive AC compressorto flow working fluid R134a throughout the system. In this innovative AC system, there is no AC compressor requirement and instead of AC compressor, electric pump is used to flow working fluid "ethanol" throughout the system. The electric pump is driven by power supply from vehicle battery in LNG vehicle. This electric pump requires very less power compared to mechanical AC compressor driven by engine.
[0021] Referring to FIG. 2 illustrated system flow of the present system,
wherein the low temperature liquefied natural gas flowing from LNG tank to LNG Vaporizer has a temperature of around -160 degree Celsius and the pipe surface temperature is around -100 degree Celsius which is exposed to ambient. This low temperature LNG is allowed to flow through Internal Heat Exchanger which exchanges this low temperature energy with Ethanol (working fluid) which has suitable properties for this application. The LNG fuel after exchanging heat with ethanol through Internal heat Exchanger flows to Vaporizer and then to engine. This low temperature ethanol from heat exchanger is supplied to evaporator with the help of electric pump driving ethanol. The ethanol flows through evaporator and exchanges this cooling with hot air coming from blower which is then circulated to cabin for providing air conditioning effect. The ethanol after coming out from evaporator goes to ethanol reservoir and recirculated for continuous operation.
[0022] It would become abundantly clear to a person in the art, after
reading this specification that the present subject matter also provides a compressor-less air conditioning system for LNG and method working thereof. More specifically, the present subject matter identify and display compressor-less air conditioning system for LNG without departing from the spirit of the present subject matter. While the subject matter may be susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and have been described herein. Alternate embodiments or modifications may be practiced without departing from the spirit of the present subject matter.

The drawings shown are schematic drawings and may not be to the scale. While the drawings show some features of the subject matter, some features may be omitted. Alternatively, in some other cases some features may be emphasized while others are not. Further, the methods disclosed herein may be performed in manner and/or order in which the methods are explained. Alternatively, the methods may be performed in manner or order different than what is explained without departing from the spirit of the present subject matter. It should be understood that the subject matter is not intended to be limited to the particular forms disclosed. Rather, the subject matter is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the subject matter.

We claim:
1) A cost-effective air conditioning system for liquefied natural gas vehicle
comprising :
a) a storage system to store liquefied natural gas at a very low temperature of > - (minus) 16o°C;
b) a liquefied natural gas vaporizer, act as heat exchangerfor regasification;
c)an electric pump; and
d) an evaporator.
wherein said cost-effective air conditioning system for liquefied natural gas vehicle is devoid of battery power unit, compressor, condenser and throttling device, etc.
2) The cost-effective air conditioning system for liquefied natural gas vehicle as claimed in claim 1, wherein heat recovery is being done through ethanol.
3) The cost-effective air conditioning system for liquefied natural gas vehicle as claimed in claim 1, wherein ethanol is working fluid to maintain the low temperature of > - (minus) i6o°C.
4) The cost-effective air conditioning system for liquefied natural gas vehicle as claimed in claim I, wherein electric pump drive working fluid ethanol in internal heat exchanger and evaporator with blower.
5) A method of construction of cost-effective air conditioning system for liquefied natural gas vehicle comprising steps of:

a) flowing of lowtemperature liquefied natural gas from liquefied natural gas (LNG)tank to liquefied natural gas Vaporizer has a temperature of around -160 degree Celsius;
b) further flowing of lowtemperature liquefied natural gasthrough internal heat exchanger which exchanges this lowtemperature energy with Ethanol (working fluid); and
c) Then it flow to vaporizer and engine finally;

wherein said cost-effective air conditioning system for liquefied natural gas vehicle is devoid of battery power unit, compressor, condenser and throttling device, etc.
6) The method of construction of cost-effective air conditioning system for liquefied natural gas vehicle as claimed in claim 5, wherein heat recovery is being done through ethanol.
7) The method of construction of cost-effective air conditioning system for liquefied natural gas vehicle as claimed in claim 5, wherein ethanol is working fluid to maintain the low temperature of > - (minus) 16o°C.
8) The method of construction of cost-effective air conditioning system for liquefied natural gas vehicle as claimed in claim 5, wherein electric pump drive working fluid ethanol in internal heat exchanger and evaporator with blower.