FIELD OF THE INVENTION
The present invention relates to a cooling system for providing personalized comfort conditions and in particular spot air conditioner system adapted for target oriented personalized cooling comfort. More particularly, the spot air conditioner system of the present invention is adapted for generation and projection of cool air bolus based individualized cooling and conditioning avoiding in the process cooling of any entire room or enclosure as a whole and thus saving on energy consumption. The system for spot air conditioning according to the invention is also advantageously portable and can thus be readily carried and installed for target specific cooling purposes. Advantageously also, the system is provided with tracking facilities for adapting to any change in required direction of cool air bolus throw based on the change in position of the target to be kept cool and comfortable. Importantly also, the system is capable of generating multiple vortex bolus generators favours projecting cold and fresh air in time sequences so that the recipient individual could feel the cool air continuously and would not encounter any discomfort from bursts of cold air at time intervals. Advantageously, the system is directed to achieve the localized cooling effect, without dispersing in the environment of room/enclosure during its travel. The system is thus capable of providing a target specific cooling system for a wide variety of domestic and industrial application in a simple and cost effective manner such as in hospital wards/cabins, office/work centers, domestic settings etc. and can be economically applied while meeting the personal comfort as well as environmental requirements.
BACKGROUND ART
It is well known in the related art of room cooling/air-conditioning, the existing system are capable of providing required cooling effect in a room or enclosure as a whole and they do not also ensure supply of fresh and clean air with moderate humidity free of any exhaled air or particulate matter for breathing. The conventional coolers desert coolers and air conditioners, further require high energy consumption for cooling an entire space of a room or office or an enclosure/auditorium, hospital ward etc. More over, the conventional air-conditioning and water evaporation based desert coolers are not hygienic considering cross contamination among individuals when many persons occupy a large confined space. The conventional systems also suffer from limitations relating to

space/size of equipments, lack of portability, economizing energy consumption/operation and maintenance costs, magnetic pollution, although may be optimal for large space occupying many persons. The existing room cooling/conditioning system do not also ensure individual comfort in terms of thermal condition, humidity and clean and fresh air for breathing. More over, the conventional systems use compressors that are susceptible to frequent failure and maintenance problems. Also the existing thermoelectric devices could not provide desired adequate thermal transfer at reasonable high efficiency and low cost per unit cooling effect or means for economizing power consumption while maintaining desired comfort conditions.
There has thus been a requirement in the art to meet the common healthcare need of thermal comfort along with clean and fresh air of moderate humidity for breathing which the existing air-conditioning or desert coolers could provide. Also there has been a need in the art to provide such comfort conditions for each individual in isolation in a closed space and thus reduced energy consumption, ensuring clean fresh air for breathing without any cross contamination. The proposed system is adapted to economize power consumption by directing air bolus projections to any individual person among the many occupying a large space and having provision for change in direction for focused air flow on target person even when moving/changing position within the room he occupies.
OBJECTS OF THE INVENTION
It is thus the basic object of the present invention to provide for a spot air-conditioning system such as a personal cooler involving air bolus projection directed to providing cooled air in the form of multiple vortex bolus from a generator projected in time sequence to any person so that the individual feels a continuous smooth flow of cold air in a surrounding localized environment with minimum energy consumption avoiding loss in cooling the room space.
A further object of the present invention is directed to a spot air-conditioning system such as a personal cooler based on air bolus projection spot air-conditioning wherein the localized/personalized cooling effect and fresh clean air free of contamination is provided to ensure individual healthy comfort condition at lower energy and other operating costs.

A still further object of the present invention is directed to a spot air-conditioning system such as a personal cooler based on air bolus projection spot air-conditioning ensuring adequate thermal transfer for desired cooling effect.
A still further object of the present invention is directed to a spot air-conditioning system such as a personal cooler based on air bolus projection spot air-conditioning with improved operating efficiency and savings in per unit energy expenditure.
A still further object of the present invention is directed to a spot air-conditioning system such as a personal cooler based on air bolus projection spot air-conditioning wherein high heat transfer rate at low temperature differential potential of evaporative cooling is linked to the low heat transfer rate at high temperature differential property of thermoelectric cooling.
A still further object of the present invention is directed to a spot air-conditioning system such as a personal cooler based on air bolus projection spot air-conditioning wherein said system is adapted to provide means for tracking movements of any target person within a room, in order to control the direction of the cooled air boluses focused on the individual ensuring personalized comfort through cooling and /breathing conditions free of exhaled air or body contaminants.
A still further object of the present invention is directed to a spot air-conditioning system such as a personal cooler based on air bolus projection spot air-conditioning wherein said system provides a duct that sucks away contaminated air in the proximity of an individual to purify and recycle back without being allowed to dissipate within the room ensuring on one hand that the cooling effect is not lost in the process and on the other hand cross contamination among the occupants in a room/enclosure, such as in a hospital ward, is advantageously avoided.
SUMMARY OF THE INVENTION
Thus according to the basic aspect of the invention there is provided a system for spot air conditioning comprising:

an air bolus unit adapted for generating and projecting targeted boluses of cooled air; said air bolus unit adapted to cool the air bolus before projecting the same to the desired target and operatively provided to retrieve /suck back the air from in and around the target areas after cooling for recycling for subsequent generation of cool air boluses.
Advantageously, the above system for spot air conditioning includes means for change in direction of air flow tracking the individual and/or target to be spot cooled.
Also, according to a preferred aspect of the invention the system for spot air conditioning comprises thermoelectric means adapted such that the temperature is lowered and some moisture withdrawn to reduce air humidity during cooled air condensation liquid are utilized such as to derive heat transfer for cooling of the thermoelectric.
Advantageously also, the system for spot air conditioning comprises multiple vortex bolus generators projecting cold air in time sequence such that the target feels a continuous air flow.
In accordance with a further aspect of the invention , the system for spot air conditioning comprises a duct means adapted to suck away air projected to the target area to purify and recycle back by way of subsequent generation of air boluses.
According to yet further aspect of the invention , the system for spot air conditioning comprises laser tracking means to control the direction of the bolus producing vortex generators.
Importantly, in the system of the invention, the said thermoelectric element is adapted to be operated at lower temperature differential and close to the maximum thermoelectric efficiency of the thermoelectric element whereby the high heat transfer rate at low temperature differential potential of evaporative cooling is linked to the low heat transfer rate at high temperature differential property of thermoelectric cooling.

According to another aspect of the invention the system for spot air conditioning involves said air bolus unit comprising atleast one air bolus projector having air cooling provision operatively to impactor means for forced generation of the cool air boluses and means to suck in the air used as cool air bolus into the air bolus projector for subsequent generation of air bolus.
Preferably, the above steam of the invention includes:
said air bolus projector comprises a cylindrical drum means having tow sections a bottom
section housing cooling coils/tubes and an upper section housing a domed shaped
diaphragm;
said impactor means comprising a diaphragm impactor rod means adapted to exert sudden reciprocating impact on the diaphragm during forward stroke such that cool air in the cylinder is forced out making near perfect rings of said air boluses and in the process creating a vacuum in the cylinder for subsequent sucking in of the used air bolus into the cylinder through a valve means for further cooling and generation of fresh air bolus and in the backward stroke of said rod means is driven by spring action such that during this stroke , the diaphragm is pulled back , the valve is adapted to remain closed and air from the cylinder passes through two layers of the diaphragm with preferably the outlet of the bolus projector covered by a light cover to prevent any air from entering from outside.
Preferably, the said impactor means comprises a rotary circular ring with diameter preferably equal to 1.1 times the amplitude of the diaphragm, said ring having a tooth, a rod means with length preferably equal to two times the diameter of the circular ring being attached to a hinge while its other end being free, said rod being operatively connected to the said diaphragm impactor rod such that when the said ring rotates, the said diaphragm impactor rod moves in straight path within a guide ;
said circular ring having a small pin means operatively connecting the hinged rod to the ring whereby the rod remains touched to the ring the pin on the ring carries the rod with it and moves it with sudden impact thereby translating circular motion into linear motion whereby the rod which is connected to the diaphragm moves the diaphragm with high

speed , in the reverse movement of the pin ,it leaves the rod down and moves up , as the diaphragm is pushed upwards by spring action the rod is adapted to move up while the rod is guided outside the purview of the circular ring and the rod slowly moves up without getting connected to the ring, the rod is gently place again under the pin which again carry it down with high speed thereby creating another sudden impact on the diaphragm.
In accordance with yet further preferred aspect of the invention , the cool air coming out of the air bolus projector is trapped at the end of the object/target and travels back to the cylinder through a pipeline and connecting valve preferably involving purifying and drying the air involving conventional means.
The said valve means is adapted to remain closed during backward stroke of the said diaphragm and open up automatically by air pressure during the forward stroke.
In accordance with yet another aspect of the invention the system for spot air conditioning comprises said cooling coils/tubes inside the cylindrical drum of the air bolus projector means which are operatively connected to an external thermoelectric water evaporator cooling device.
The present invention and its objects and advantages are described in greater detail with reference to the following non limiting illustrative figures and embodiments.
BRXEF DESCRIPTION OF THE ACCOMPANYING FIGURES
Figure 1: is the schematic illustration of an embodiment of the spot air-conditioning/individualized cooling system comprising multiple vortex bolus generators and projector unit, according to the present invention, including the pick up suction duct.
Figure 2: is the schematic illustration of the rotating ring (A) showing the side view and the location of the pin (p) on its circumference.

Figure 3: is the schematic illustration of the air bolus projection spot air-conditioning system and the location and functional combination of its different subsystems/units, showing the propagation of projected cold air boluses directed to target person.
Figure 4: is the illustration of the multiple vortex air bolus projection unit and the thermoelectric cooling unit in combination, forming the essential subsystems of the spot air-conditioner according to the present invention, connected with suitable flexible air-ducting.
Figure 5: is the schematic illustration of the inside view of the multiple air vortex bolus generator and projector unit according to the present invention.
Figure 6: is the schematic illustration of the inside of cooling unit comprising the heat sink with cooling water tank and cooling fans, coolant box interfaced with thermoelectric module.
DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING FIGURES
Reference is first invited to the accompanying Figure 1, that illustrates a preferred embodiment of the spot air-conditioning/individualized cooling system comprising multiple vortex bolus generators and projector unit having the impactor unit, according to the present invention, including the pick up suction duct for collecting used air. It is clearly apparent from the Figure 1 that an impactor mechanism for creating and projecting air balls has been devised. A domed shaped diaphragm (d) is used to blow the air in forward stroke while used air from the end of the bed is blown out by the immediately previous return stroke is sucked in through the valve (v) at the end of the duct T so as to ensure that the air is re-circulated and not allowed to move out of the bed/drum. The diaphragm may be made of thick canvas or 'Nylon fabric reinforced rubber' and has two layers with holes at scattered locations. The diaphragm is capable to withstand the high magnitude of shear and impact forces to which it is subjected during the forward stroke of the diaphragm. It has a semispherical shaped bottom and conical top (dome shaped) connected to a rod Y that exerts a sudden linear impact to invert the diaphragm in less than millisecond time operatively by the rotation of a ring of selective

diameter, said rod having rotatable connection at its circumference. The rod 'r' is long enough to invert the diaphragm completely during the forward stroke and similarly pulls it back to its original position on the backward stroke. It is also apparent from Figure 1 that the cylindrical drum (Dm) has two portions. The bottom part 'Dm-2' that houses the cooling coil and the upper portion 'Dm-1' that houses the deflecting diaphragm. When the rod V exerts the sudden impact on the diaphragm during the forward stroke, the air entrapped inside it and in the cylindrical drum 'Dm-2' is pushed out of the cylinder making near perfect rings/spheres which is titled by the inventor as 'bolus' that ensures turbulence free air movement till it reaches the target person at other end /edge until it is trapped to re-circulate again through the duct Y. It may be further emphasized that during the forward stroke of the rod V a vacuum is created inside the drum portion 'Dm-1' that facilitates trapping the exhausted air and pulling it back to the drum portion 'Dm-1'. On its return path to the drum, the used air is cleaned and disinfected for fresh charging to bolus formation. The cleaned air is cooled at the bottom part 'Dm-2' by means of the cooling coils provided with thermoelectric cooling module in combination with water evaporative condensation favoring desired de-humidification of fresh charge of air for projection during the next stroke.
Unlike the forward stroke, the return stroke is slow and driven by spring action. It is during this stroke the diaphragm (d) is pulled backward, the valve V remains closed and air from the drum potion 'Dm-1' passes through the two layers of the diaphragm spaced at selective gap in between the layers and having distributed holes of diameter in the range of lcm-2cm, that allow the air to pass through to the drum portion 'Dm-2' and is cooled by surrounding parallel cooling coil. In one embodiment, the mouth opening of the drum of the multiple air bolus generating and projecting unit is closed automatically during the back stroke by a light weight cover that stops air from entering from out side the system, except through the valve only to maintain cleanliness and prevent contamination.
More Importantly, the speed of diaphragm movement and creating the sudden impact is achieved by an innovative process comprising a circular ring(A) having diameter equal to 1.1 times the amplitude of diaphragm deflection required, said ring being rotated by a motor drawing low power. A rod (R) having length two times that of the diameter of said circular ring, connected with the ring by means of a flexible sliding screwed/pin connection through slot (b), said rod (R) hinged at one end and the other end remaining

free. The link connection of the rod and the circular ring is so arranged that due to the rotation of the circular ring the rod (R) oscillates in between the two extreme tangential positions of said ring. Further, the rod (R) has a slot at "b" and the rod V is so connected to rod 'R' at the slot 'b' such that when the ring moves, the rod 'r' moves exactly in straight line within a guide 'g'. The circular ring has a small pin 'p' about 0.5 cm long and 0.25 sq. cm cross section, attached at one point to hold the rod 'r' in slot 'b' in rod 'R'. The circular ring rotates clock-wise at a high rpm. The attachment of the rod with the circular ring is such that the pin on the ring carry the rod Y in a manner that sudden impact is created to the diaphragm during rotation of the ring pulling the rod Y in a straight line, translating the circular motion of the ring into linear motion of the rod Y with attached diaphragm moving at a high speed. In the reverse movement of the pin, it leaves the rod at the down position and moves up along the ring. As the diaphragm is pushed upward by spring action, the rod Y tries to move up. However, the rod is guided free of infringing with the circumference of the ring and slowly moves up without getting connected to the ring. The rod is gently placed again under the pin xp' which again carries it down with high speed creating another sudden impact on the diaphragm. This method of generation forward and return path of the pin (p) mounted on the ring(R) is illustrated in accompanying Figure 2.
Cool air coming out of the bolus generator and projector is trapped at the end of the bed/object at suction end of duct 't' and travels back to the cylinder/drum 'd' through suction duct and valve (v). On its way back the air can be purified and dried using conventional means. The valve (v) remains closed during the backward stroke of the diaphragm and opens up automatically by air pressure during the forward stroke.
Reference is now invited to the accompanying Figure 3, that illustrates the schematic arrangement of the air bolus generation and projection unit, the diaphragm impactor(DIR) unit, the combined thermoelectric and water evaporation cooling unit(CU), insulated ducting connecting the bolus projector(PR) and air cooling units of the spot air-conditioning system according to an embodiment of the present invention. The air bolus generation and projection function has already been described by the use of an impactor device with reference to the accompanying Figure 1. The Air bolus projection drum with the vortex outlet are so arranged that depending on the frequency of strokes of the diaphragm impactor(DIR), a series of boluses(B) flows in uniformly time sequenced stream directed to the target individual so that the person feels smooth flow of cool and

clean air. The copper coil/coolant tubes(CCT) surrounding the air drum inside the bolus generator through which coolant is circulated cools the air to the desired temperature. As the air is sucked in from relatively cold region near to the individual, the efficiency and energy economy of the system is better realized by the system based on fundamental thermodynamic principles. The used air sucked in through a duct from near target spot, is further cleaned and purified using conventional means to ensure delivery of hygienic comfort and thermal condition to any recipient. According to an optional embodiment, a built in sensor based tracking system is installed that track the movements of the target person within a room or office or any closed space, so that the bolus projection is directed to reach to the changed position, within certain limitations on distance.
Reference is now invited to accompanying Figure 4 that illustrates schematically an arrangement wherein the air projection unit and the cooling unit are shown to be connected with flexible insulated ducting for coolant circulation. The air projection unit has multiple air bolus generators and at least two generators, having two vortex projection outlets adapted to direct the boluses of cold air in time sequence to travel from the generator to target person without dispersing in the environment during its travel.
Reference is next invited to the accompanying Figure 5 that illustrates the inside view of the multiple air vortex bolus generator and projector unit showing the two vortex generating units with parallel copper coolant coil on inner wall of the bolus generator drum which is thermally insulated from outside. A coolant circulating pump circulates the coolant through said copper coil inside the bolus generator drums through connecting flexible insulated coolant pipe. The vortex generator outlets having flexibility of changing the direction of projection in desired spot/location.
Reference is now invited to the accompanying Figure 6 that schematically illustrates the inside of cooling unit comprising the heat sink with cooling water tank and cooling fans, coolant box interfaced with thermoelectric module, according to the spot air conditioning system of the present invention. It may be noted that the invention makes innovative combination of thermoelectric cooling with water evaporative cooling in the cooling system of the present invention that favor elimination of use of conventional compressor and economize energy consumption as well as eliminating associated frequent breakdown and maintenance problems. It is shown in the Figure 6, that the heat sink is a cooling water tank provided with cooling fan. Moreover, a coolant box with cold face receiving the circulating coolant from cooling coils and is interfaced with a thermoelectric

module, further provide cooling of circulating coolant in addition to providing the evaporative cooling effect. The cooling system of the invention further achieve improved efficiency of cooling by sucking in air from relatively cooler air from the ambience of the target spot. The heat pumping of thermoelectric unit is enhanced by cooling the thermoelectric device using air withdrawn from the cooled zone and direct water evaporative cooling of the thermoelectric heat sink. Thus the thermoelectric element is operated at lower temperature differential and close to the maximum thermal electric efficiency of the thermoelectric element. Also, such method of cooling of the circulating coolant for air cooling, the high heat transfer rate at low temperature differential potential of evaporative cooling is linked to the low heat transfer rate at high temperature differential property of thermoelectric cooling.
It is thus possible by way of the present invention to providing for a spot air-conditioning system such as an air bolus projection type spot air-condition system for personalized cooling and comfort. Importantly, the system of the invention enables the target individual to feel a continuous flow of cooled air and does not encounter any undesired discomfort due to bursts of cold air at certain time intervals. Advantageously, the air bolus projection based spot air-conditioning system of the invention not only ensure supply of desired comfort coolness and clean fresh air with controlled humidity, free of any dust or cross contamination, in a smooth flowing cooled clean air in surroundings of a person but also ensure economy in per unit energy expenditure. The spot air-conditioning unit according to the present invention is thus capable of providing desired comfort condition to individual occupant in a large confined space at the surrounding zone of the target person, without needing to cool the entire space and thereby reduce energy consumption, ensure compactness and portability of the device/system, lower cost and less complexity in operation. The cooling system of the invention is further capable of providing optionally means for automatic tracking of the person moving in the confined area so that the stream of air bolus projections are directed accordingly to the target person. The air bolus projection spot air conditioner system of the present invention is thus capable of providing a cooling system for individuals/definite targets in a variety of industrial applications including patients in a hospital wards, office premise, domestic setting and industry specifically where a clean and cool work atmosphere is essential, in a simple and cost effective yet hygienic manner economizing energy expenditure.

WE CLAIM:
1. A system for spot air conditioning comprising:
an air bolus unit adapted for generating and projecting targeted boluses of cooled air; said air bolus unit adapted to cool the air bolus before projecting the same to the desired target and operatively provided to retrieve /suck back the air from in and around the target areas after cooling for recycling for subsequent generation of cool air boluses.
2. A system for spot air conditioning as claimed in claim 1 comprising means for change in direction of air flow tracking the individual and/or target to be spot cooled.
3. A system for spot air conditioning as claimed in anyone of claims 1 or 2 comprising thermoelectric means adapted such that the temperature is lowered and some moisture withdrawn to reduce air humidity during cooled air condensation liquid are utilized such as to derive heat transfer for cooling of the thermoelectric.
4. A system for spot air conditioning as claimed in anyone of claims 1 to 3 comprising multiple vortex bolus generators projecting cold air in time sequence such that the target feels a continuous air flow.
5. A system for spot air conditioning as claimed in anyone of claims 1 to 4 comprising a duct means adapted to suck away air projected to the target area to purify and recycle back by way of subsequent generation of air boluses.
6. A system for spot air conditioning as claimed in anyone of claims 1 to 5 comprising laser tracking means to control the direction of the bolus producing vortex generators.

7. A system for spot air conditioning as claimed in anyone of claims 3 to 6 wherein the said thermoelectric element is adapted to be operated at lower temperature differential and close to the maximum thermoelectric efficiency of the thermoelectric element whereby the high heat transfer rate at low temperature differential potential of evaporative cooling is linked to the low heat transfer rate at high temperature differential property of thermoelectric cooling.
8. A system for spot air conditioning as claimed in anyone of claims 1 to 7 wherein said air bolus unit comprises atleast one air bolus projector having air cooling provision operatively to impactor means for forced generation of the cool air boluses and means to suck in the air used as cool air bolus into the air bolus projector for subsequent generation of air bolus.
9. A system for spot air conditioning as claimed in claim 8 wherein said air bolus projector comprises a cylindrical drum means having tow sections a bottom section housing cooling coils/tubes and an upper section housing a domed shaped diaphragm;
said impactor means comprising a diaphragm impactor rod means adapted to exert sudden reciprocating impact on the diaphragm during forward stroke such that cool air in the cylinder is forced out making near perfect rings of said air boluses and in the process creating a vacuum in the cylinder for subsequent sucking in of the used air bolus into the cylinder through a valve means for further cooling and generation of fresh air bolus and in the backward stroke of said rod means is driven by spring action such that during this stroke , the diaphragm is pulled back , the valve is adapted to remain closed and air from the cylinder passes through two layers of the diaphragm with preferably the outlet of the bolus projector covered by a light cover to prevent any air from entering from outside.

10. A system for spot air conditioning as claimed in anyone of claims 8 or 9 wherein said
impactor means comprises a rotary circular ring with diameter preferably equal to 1.1
times the amplitude of the diaphragm, said ring having a tooth, a rod means with length
preferably equal to two times the diameter of the circular ring being attached to a hinge
while its other end being free, said rod being operatively connected to the said
diaphragm impactor rod such that when the said ring rotates, the said diaphragm
impactor rod moves in straight path within a guide ;
said circular ring having a small pin means operatively connecting the hinged rod to the ring whereby the rod remains touched to the ring the pin on the ring carries the rod with it and moves it with sudden impact thereby translating circular motion into linear motion whereby the rod which is connected to the diaphragm moves the diaphragm with high speed , in the reverse movement of the pin ,it leaves the rod down and moves up , as the diaphragm is pushed upwards by spring action the rod is adapted to move up while the rod is guided outside the purview of the circular ring and the rod slowly moves up without getting connected to the ring, the rod is gently place again under the pin which again carry it down with high speed thereby creating another sudden impact on the diaphragm.
11. A system for spot air conditioning as claimed in anyone of claims 1 to 10 wherein the cool air coming out of the air bolus projector is trapped at the end of the object/target and travels back to the cylinder through a pipeline and connecting valve preferably involving purifying and drying the air involving conventional means.
12. A system for spot air conditioning as claimed in claim 11 wherein the said valve means is adapted to remain closed during backward stroke of the said diaphragm and open up automatically by air pressure during the forward stroke.

13. A system for spot air conditioning as claimed in anyone of claims 9 to 12 wherein said cooling coils/tubes inside the cylindrical drum of the air bolus projector means are operatively connected to an external thermoelectric water evaporator cooling device.
14. A system for spot air conditioning substantially as hereindescribed and illustrated with reference to the accompanying figures.

A cooling system for providing personalized comfort conditions by spot air conditioner system providing continuous flow of cooled clean fresh air free of cross contamination. The system provides means for multiple vortex bolus generation and projection of cool air bolus for personalized cooling as multiple boluses in time sequences reaching target individual without dissipating in the ambient air instead of cooling an entire room and thus saving on energy consumption. The spot air conditioning is portable and can be easily carried and installed for target specific cooling purposes. The system uses thermoelectric element operating at lower temperature differential and close to maximum thermoelectric efficiency, whereby the high heat transfer rate at low temperature differential potential of evaporative cooling is linked to the low heat transfer rate at high temperature differential property of thermoelectric cooling. The system is suitable for domestic and industrial application in a simple and cost effective manner in hospital wards/cabins, office/work centers, hotels, canteens or domestic settings meeting the personal comfort as well as environmental/hygienic requirements.