WO2020003324A1

WO2020003324A1 - Portable personal eco-friendly air cooling system and method thereof

Info

Publication number: WO2020003324A1
Application number: PCT/IN2019/050476
Authority: WO
Inventors: Monish Kumar SIRIPURAPU
Original assignee: Ant Studio Llp
Priority date: 2018-06-24
Filing date: 2019-06-24
Publication date: 2020-01-02

Abstract

The present invention relates to a portable, cost-effective, eco-friendly, sustainable and energy efficient air cooling system based on the principle of evaporative cooling. The geometry of the system is designed in a way that it is a singular volume with a central vent or air passage (15) comprising air cooling units made up of a material capable of capillary action (10), the air cooling units (10) stacked in frame (12) to form air cooling pads (11), a motorized fan or blower (31) placed at the end or in between the plurality of air cooling pads (11), a coolant collection tank (60) to store coolant (20). The plurality of air cooling units (10) are of specific shape and size and arranged in a specific manner to maximize the surface area needed for evaporative cooling, thereby reducing the speed and temperature of incoming hot air (30) to optimize contact surface area and contact time of the incoming hot air (30) with the coolant (20), thereby making the system energy efficient, sustainable, eco-friendly and cost-effective. The system further comprises of sensors (40, 40a, 40b, 40c,... 40n), rotatable base control device, electronic control unit (45), filtration unit and display unit.

Description

TITLE OF THE INVENTION:

PORTABLE PERSONAL ECO-FRIENDLY AIR COOLING SYSTEM AND METHOD THEREOF

FIELD OF INVENTION

The present invention relates to a novel eco-friendly sustainable air cooling system and method thereof. More particularly, the present invention relates to a cost- effective, eco-friendly, energy efficient and air purifying air cooling system based on principles of evaporative cooling for creating a cool microclimate for an individual(s) in small spaces.

BACKGROUND OF THE INVENTION

Human dependence on electricity and machines cannot be discounted in today’s time. The huge consumption of energy by the use of electricity is undoubtedly affecting quality of life. While the life inside an air-conditioned room has its own comfort, in parallel the life next to the air conditioner outdoor unit can be equally unbearable.

Existing air conditioners consume a lot of energy, release harmful chemicals into environment during the life cycle, expensive and they are not effective in open and semi open spaces. Research has proven that the indoor quality of such closed spaces is more polluted and harmful to health than open spaces with natural ventilation. Major drawback in air conditioner is the need to cool the entire volume in a space irrelevant to the occupancy.

Therefore, there is an urgent need to address this problem by devising a bespoke solution to simplify and reinterpret the concept of air-conditioning, understanding that the conventionally known standardized solutions may not be universally applicable amidst the constraints of cost and surrounding environment. Various other known compression systems offer varied solution, but still comes with yet another disadvantage of heavy electrical use to drive compressors. At peak demand periods, the electricity required by excessive use of air conditioning systems has resulted in brownouts. This ever increasing demand of electricity poses another formidable challenge in cooling stream of air in air conditioning systems.

In order to overcome aforementioned limitations, there exists a need for an improved, cost-effective air-cooling systems that reduce the consumptions, that can perform effectively in open, semi open and closed spaces, that are made with no plastic and are environmental friendly using materials such as clay, terracotta, ceramics, natural fibres like jute, paper etc. and are low in maintenance and provides sustainable solution to condition warm moisture-laden air to comfortable temperatures.

Reference is made to the United States Patent application bearing no. US 14834288 titled“Evaporative HVAC apparatus” which discloses an evaporative HVAC apparatus with at least one absorbent wicking layer having a first surface and an opposing second surface, and an at least one thermal layer also having a first surface and an opposing second surface. The second surface of the at least one thermal layer is formed immediately adjacent to the first surface of the at least one wicking layer. An at least one fluid line is in fluid communication with the at least one wicking layer. Thus, a fluid is selectively delivered to the wicking layer through the at least one fluid line which, in turn, permeates the at least one thermal layer and evaporates into the air located immediately adjacent the exposed first surface of the at least one thermal layer, thereby affecting the temperature of the air.

Another reference is made to Indian Patent application no. 648/MUM/2006 titled “Air Cooling System” disclosing a system useful for the purpose of cooling room air or directly cooling the user. The system consists of a fan or blower, with baked clay, earth or terracotta cooling tubes arranged at the rear. These tubes or grids receive water from an overhead tank as the fan / blower is switched on, air is pulled in over the tubes / grids which are cooled by evaporation from the tube surface, the air thus cooled is sent out into the room or on to the user as a cool draft of air.

A further reference is made to the United States Patent application bearing no. US9182136B2 titled“Heating and cooling system” which discloses an integrated heating and cooling system for a living space of a building connects together (a) a solar-based heating and cooling system and (b) heating and cooling systems that rely directly or indirectly on fossil fuels that are conventionally used in buildings. The system operates the solar-based heating and cooling system preferentially to heat or cool the living space. Therefore, the system minimizes the use of fossil fuels to heat and cool the living space.

Another reference is made to Patent application no. FR92013121 titled“Natural air conditioner for domestic building - comprises closed but porous terracotta vessels, outer containing water and inner containing freely-circulating air” which provides a porous terracotta brick section is closed by pinch-welded covers and by firing, thereby forming a closed vessel containing water in its outer-part (PP) and allowing air to circulate freely in its interior column (PC). The water contained in the closed vase transpires through capillary action through the external porous walls, and there evaporates in contact with heat or wind. The evaporation cools the circulating air in the internal column, which exhausts through an interior orifice and is replaced by hot air through an upper orifice. If installed on an external facade so that the lower (PI) and upper (PS) orifices communicate with a dwelling it provides air conditioning.

A further reference is made to the United States Patent application bearing no. US7296785B2 titled “Water curtain apparatus and method”, providing an evaporative cooler comprising a housing having an upper surface and at least one vertical wall defining a chamber. The upper surface can include at least one opening in communication with the chamber. The evaporative cooler can also comprise at least one drain slit assembly for distributing a fluid and further comprise at least one screen. The screen can define a portion of the vertical wall. The screen can have an interior surface and an exterior surface relative to the chamber. In addition, the screen can be disposed relative to the drain slit assembly such that the drain slit assembly distributes the fluid over the screen. The screen can be configured such that the fluid forms a surface fluid layer over the surfaces of the screen. The evaporative cooler can further comprise an air conveyor disposed within the housing for drawing air through the opening and into the chamber such that the air is conveyed through the screen and the fluid layer.

Another reference is made to the United States Patent application bearing no. US20090301123 A1 titled“Integrated Computer Equipment Container and Cooling Unit” which discloses a shipping container having an interior and a plurality of electronic equipment modules disposed within the interior of the container is cooled by an air conditioning unit adapted to be disposed within the interior of the container. The cooling can be assisted or assumed by use of an air side economizer cycle, or by use of a water side economizer cycle. The electronic equipment may include computing equipment and electronic data storage equipment.

A further reference is made to the United States Patent application bearing no. US 14/372,485 titled“Cooling system for a building with low energy consumption” which provides a building cooling system involving circulation of a cooling liquid in a hydraulic circuit comprising at least one first tank (2), at least one second tank (4) in which at least part of one of its walls (4.1) are made of a porous material and at least one heat exchanger (6) connected in series through a hydraulic circuit, at least one hydraulic pump (8) placed between the first tank (2) and the heat exchanger (6), in which the second tank (4) is located outside the building, in which in which the system comprises means (10) of controlling circulation of liquid from the second tank (4) to the first tank (2), and when the system is in operation to cool the inside of the building, flow from the second tank (4) to the first tank (2) is interrupted and the hydraulic pump (8) circulates the liquid from the first tank (2) to the second tank through the heat exchanger (6), such that the second tank fills up.

However, none of the applications referred in the above mentioned prior art discloses a sustainable and ultra-low maintenance air cooling system with air purifying mechanism, which is capable of working in harsh and adverse conditions, eco-friendly and cost-effective and can work with any source of air whether natural or artificial and capable of recycling and recirculating the coolant thereby providing sustainable solution to condition warm moisture-laden air to comfortable temperatures.

OBJECTS OF THE INVENTION

Accordingly, the main object of the present invention is to provide a novel eco- friendly sustainable air cooling system based on principles of evaporative cooling for creating a cool microclimate for an individual(s) in small spaces.

Another object of the present invention is to provide a novel eco-friendly sustainable air cooling system comprising of air cooling units forming capillary cooling pads to pump the water up through capillary action without use of electric motors.

Yet another object of the present invention is to provide a novel eco-friendly sustainable air cooling system comprising a cooling tank capable of recycling and recirculating the coolant in the system through the capillary action of capillary cooling pads.

Yet another object of the present invention is to provide a novel eco-friendly sustainable air cooling system capable of functioning with any source of air such as artificial air or natural air. Yet another object of the present invention is to provide a novel eco-friendly sustainable air cooling system capable of optimizing thermal capacity of the coolant to cool warm air in diverse conditions with low maintenance.

Yet another object of the present invention is to provide a compact, economical evaporative air cooling system that requires minimal power.

Yet another object of the present invention is to provide a novel eco-friendly sustainable air cooling system with sensor to read various parameters including temperature, pressure, humidity to adjust the orientation of the system using a rotatable base control device in its base.

Yet another object of the present invention is to provide a novel eco-friendly air cooling system with water dispensing mechanism that cools the water contained in the coolant collection tank.

Yet another object of the present invention is to provide a method of novel eco- friendly sustainable air cooling system based on principles of evaporative cooling for creating a cool microclimate for an individual(s) in small spaces.

Yet another object of the present invention is to provide a method of operating novel eco-friendly sustainable air cooling system capable of naturally cooling the coolant in the tank to enhance the efficiency of the air cooling.

Yet another object of the present invention is to provide a novel eco-friendly air cooling system that absorbs the carbon and dust particles in the capillary cooling pads.

Yet another object of the present invention is to provide a method of operating novel eco-friendly sustainable air cooling system capable of recycling and recirculating the coolant. SUMMARY OF THE INVENTION

Accordingly, the present innovation provides a novel portable eco-friendly air cooling system and method thereof for creating a cool microclimate for an individual(s) in small spaces.

The air cooling system of the present invention is based on the principle of evaporative cooling. The system of the present invention is energy-efficient, eco- friendly, sustainable and cost-effective.

The air cooling system comprises of a plurality of air cooling units made up of a specific material and forming capillary cooling pads, coolant, coolant collection tank to collect excessive coolant and recycle, such that the capillary cooling pads receive an incoming stream of air and the coolant rises over the plurality of capillary cooling pads to cool the incoming hot stream of air flowing through said plurality of capillary cooling pads, sensor, a rotatable base control device to sense the inputs from the sensor and to control the direction of the outflow of air accordingly, electronic control unit and a dehumidifying unit within or externally to control the humidity. The specific material forming the air cooling units are selected from biodegradable material such as jute or other natural fibres.

The system further comprises of at least one sensor that can detect and help control various parameters like temperature, humidity and pressure, and proximity of user to control the angle of the system and its performance.

The air cooling system comprises of a housing , an air source and central vent or air passage. The housing has a predefined hollow tubular geometry and predefined size depending upon the requirement of the user. The housing is made up of porous material having latent heat and adsorption properties. The predefined geometry and predefined size is determined by advanced computational analysis and modem calibration techniques. The source of air can be artificial or natural source placed within the housing. The artificial source of air can be a motorized fan or blower. The thickness and the length of the material used for manufacturing the air cooling unit is optimized with CFD Analysis (Computational Fluid Dynamics) calculated on the basis of surrounding environment.

The central vent or air passage is again of predefined hollow tubular geometry which conjoins at both ends of the tube. The end diameter of said air passage is different on the both sides to create pressure difference. The air entering the air passage is circulated by the source of air placed closer to the smaller end diameter of the air passage. The air is then blown with thrust towards the other end diameter of the air passage. The vacant space within the housing between inner walls of housing and outer wall of air passage is used to store coolant, such as water.

The system enables the condensation process in a manner to retain coolant for long period of time, thereby using maximum thermal capacity of the coolant and facilitate the recycling of the coolant

The coolant is selected from a range of substances that are nontoxic and chemically inert having high thermal capacity and low viscosity capable of reducing or regulating the temperature of the system of present invention and does not cause or promote corrosion to the cooling system.

The invention further comprises of one or more sensors which makes the system capable of detecting variable parameters such as, but not limited to, pressure, temperature and humidity. The sensors are installed at the inlet and outlet of the central vent or air passage to read the pressure difference, temperature and humidity levels of the incoming and exiting air streams. Additional sensors are installed at the base of the air cooling system to read the temperature and moisture contents of the surroundings.

The invention further comprises of an Electronic Control Unit (ECU) which is configured to collect data from the sensors and controls and regulates output as per the requirements of the user. The invention additionally includes twisted baffles at the output end to regulate the airflow and increase surface area, hence increasing the efficiency of the air cooling system. The system is capable of being placed in relation to the flow of air, which is capable of being placed horizontal, vertical or inclined.

The present invention also discloses a method of operating the novel portable eco- friendly sustainable air cooling system based on principles of evaporative cooling in a manner to optimize thermal capacity of the coolant. The coolant is filled in the coolant collection tank either using pump or a mechanical device that regularly fills the coolant or topped up manually after specific period of time depending on the rate of evaporation, which can help reduce energy consumption.

Hence present invention provides a novel portable eco-friendly air cooling system and method based on principles of evaporative cooling which is cost-effective, eco- friendly and energy efficient.

BRIEF DESCRIPTION OF DRAWINGS

Figure. 1 illustrates perspective view of air cooling system showing housing and central vent.

Figures. 2a and 2b illustrate cross sectional view of air cooling system.

Figure. 3 depicts front view of the air cooling system.

Figure. 4 depicts arrange of air cooling units forming capillary cooling pads in frames and motorized fan.

Figure. 5 depicts air cooling system in accordance with one working embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE INVENTION WITH NON-LIMITING EMBODIMENTS AND EXAMPLES

It should be noted that the particular description and embodiments set forth in the specification below are merely exemplary of the wide variety and arrangement of instructions which can be employed with the present invention. The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof All the features disclosed in this specification may be replaced by similar other or alternative features performing similar or same or equivalent purposes. Thus, unless expressly stated otherwise, they all are within the scope of present invention. Various modifications or substitutions are also possible without departing from the scope or spirit of the present invention. Therefore, it is to be understood that this specification has been described by way of the most preferred embodiments and for the purposes of illustration and not limitation.

It has to be understood and acknowledged for this specification and claims, that the term "air cooling system" and or“air conditioning system” refers to a fully integrated air conditioning system that is configured to cool the usually heated up and polluted indoor air. An air cooling system having desirable features and advantages will now be described with reference to the figures. Although the following description is provided in the context of an example air conditioning system, it should be understood that the disclosure is not limited by the examples or claims. None of the structures, steps, or other features disclosed herein is essential or indispensable; any can be omitted or substituted by an equivalent.

Certain terms are used herein, such as“top”,“bottom”,“upward”,“downward” and the like, to assist in providing a frame of reference. It is also to be understood that the terminology used in the description is for the purpose of describing the particular versions or embodiments only and is not intended to limit the scope of the present invention, which will be limited only by the appended claims. The words "comprising", "having", "containing", and "including", and of other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items or meant to be limited to only the listed item or items. The disclosed embodiments are merely exemplary methods of the invention, which may be embodied in various forms.

Referring more particularly to the drawings by characters of reference, Fig. 1 discloses an air cooling or conditioning system utilizing the method of evaporative cooling including use of cooling properties of easily available liquids or gases that either reduce or regulate the temperatures of system. The disclosure aims to simplify and reinterpret the concept of air conditioning, understanding that standardized solutions may not be accepted in their entirety, given the constraints of cost and surrounding environment.

The air cooling system of present disclosure provides an affordable, energy efficient and robust solution to condition the hot air by converting them into a pleasant breeze. Broadly, the air cooling system comprises of housing (5) made up of a substrate, plurality of air cooling units (10), a coolant collection tank (60) to contain coolant (20), a central vent or air passage (15) configured to receive an incoming stream of hot air, and a coolant (20) which is recycled at room temperatures and run over the central vent (15) or air passage inside the housing (5) with the help of capillary action (Fig. 1). The housing (5) has an opening at the top to pour the coolant (20) inside coolant collection tank (60). The air cooling units are stacked together in a frame (12) to form capillary cooling pad (11) which pull the coolant (20) over the surface through a hole (16) at the base of the central vent (15) to keep the surface of the central vent or air passage (15) moist and cool from the inside of the housing (5). A plurality of capillary pads (11) are placed in the central vent or air passage (15) to cool the incoming hot stream of air (30) flowing through said plurality of capillary cooling pads (11). Further, the coolant (20) is circulated inside the plurality of air cooling units (10) or is absorbed by the specific material they are made up of through capillary action forming said air cooling pads (11). The specific material forming the air cooling units are selected from biodegradable material such as jute or other natural fibres (Fig. 2a and 2b). The plurality of air cooling units are made up of a specific material and forms capillary cooling pads. The specific material forming the air cooling units are selected from biodegradable material such as jute or other natural fibres. The coolant collection tank collects excessive coolant and recycle, such that the capillary cooling pads receive an incoming stream of air and the coolant rises over the plurality of capillary cooling pads to cool the incoming hot stream of air flowing through said plurality of capillary cooling pads. The air cooling system also comprises of one or more sensors and a rotatable base control device to sense the inputs from the sensors. The rotatable base control device controls the direction of the outflow of air based on the inputs from the sensors. The system also comprises of electronic control unit and display unit (35) (Fig. 5).

In an embodiment of present disclosure, different types of coolant (20) can be used in the installation, including but not limited to traditional water, although high heating capacity and low cost makes water a suitable heat-transfer medium for the purposes of present disclosure. While for the purposes of present disclosure, various other kinds of liquid or gas can be used to reduce or regulate the temperature of a system.

In accordance with one preferred embodiment of present disclosure, an ideal coolant (20) shall have high thermal capacity, low viscosity, is low-cost, non-toxic, chemically inert, and neither causes nor promotes corrosion of the cooling system. Some examples of such installation may include utilization of betaine, purified water (deionized, distilled and double distilled) or recycled water, nanofluids, sea water, salts or a combination thereof as preferred coolant. It shall be noted that, recycled water might need regular maintenance to clean the pores on the exterior surface and hence regular water is recommended for long term performance of the installation.

In one aspect of the disclosure, the plurality of air cooling units (10) are stacked in a frame (12) to form air cooling pads (11) and inserted in the central vent or air passage (15) to maximize the surface area of cooling pads (11) configured to cool the incoming stream of hot air (30). More preferably, length and the diameter of the central vent or air passage (15) help reduce the speed and temperature of the incoming hot air by increasing the surface of contact with the coolant (20) in the installation. The central vent or air passage (15) is of hollow tubular geometry conjoined at both ends, i.e. inlet and the outlet, of the central vent (15) with different diameter on the both ends creating the pressure difference the air entering the central vent or air passage (15) is circulated by the source of air (30) placed closer to the end with smaller diameter, i.e. inlet of the air passage and blown with thrust towards the end with larger diameter, i.e. outlet of the central vent or air passage

(15).

Depending on the cooling capacity and requirement, the shape and sizes of the central vent or air passage (15) and the overall setup can be modified through advanced computational analysis and modern calibration techniques. Further, as stated above, the plurality of capillary cooling pads (11) are stacked in a frame (12) and enclosed inside the central vent or air passage (15). A provision for motorized fan or blower (31) is made either at the inlet of the central vent (15) or in between the plurality of air cooling pads (11) (Fig. 3 and 4). Incoming stream of air (30) passes through the pads (11) in the central vent (15), bringing down the temperature of the air, thereby cooling the surroundings in energy efficient, sustainable, eco- friendly and cost-effective manner.

The thickness, porosity and the length of the material used for manufacturing the capillary cooling units (10) are optimized with CFD analysis (computational fluid dynamics) to regulate the evaporation rate. The material of the capillary cooling pads is based on the desired evaporation rate requirement for various climatic condition or relative humidity.

Capillary action of the material (terracotta, ceramic etc.) keeps the surface temperature of the housing (5) considerably low as compared to surroundings. The cooling pads (11) placed in the central vent (15), pulls the water filled in the tank over the surface through capillary action. The coolant is absorbed by the plurality of capillary cooling pads (11) which are made up of specific material and shape and size and arranged in a specific manner to maximize the surface area of said capillary cooling pads (11), thereby reducing the speed and temperature of incoming hot air (30) to optimize contact surface area and contact time of the incoming hot air (30) with the coolant (20).

The absorption and latent heat properties of terracotta along with its wide recognition as an eco-friendly and biodegradable material makes it ideal for use as a substrate in forming the housing (5). Further, the terracotta is quite stable in withstanding the pressure at which the hot air is received by the housing (5) and the central vent (15). More preferably, the fired terracotta ware has a much better ability to withstand sudden temperature changes without cracking, i.e. they are able to withstand thermal shock, which refers to stresses imposed on a ceramic by the volume changes associated with sudden shifts in temperature. The open porous nature of the substrate that is a product of the very low firing temperature gives it the ability, in many cases, to even survive an open flame.

According to one exemplary embodiment, a terracotta cup which is glazed with G2931G clear glaze (Ulexite based) and fired at cone 03, is capable of surviving 25 seconds under direct flame against the sidewall before a crack occurs. In contrast, typical porcelains and stoneware would survive 10 seconds, while the super vitreous porcelains would survive up to 5 seconds only. Sudden changes in temperature cause localized thermal expansion, which produces tension and compression that easily cracks most ceramics. But the porous nature of disclosed substrate absorbs it much better. The hot incoming air (30) flowing out through the air cooling pads (11) is cooled down through the process of evaporative cooling and hence decreases the temperature of that particular environment.

In one other embodiment, the sensors (40), say for example, pressure sensor (40a), temperature sensor (40b) and humidity sensor (40c) are installed at the inlet and outlet of the air cooling units (10) to read the pressure difference, temperature and humidity levels respectively of the incoming and outgoing stream of air (32).

An ECU (electronic control unit) (45) is installed which is configured to collect data from the sensors (40) and control desired output for the user. The rate of flow of coolant (20) and the velocity at which the motorized fan or blower (31) operates depends on the surrounding environment and can be automatic or controlled by the user.

With continued reference to above disclosed units of the present air cooling system (1) further comprises a dehumidifying unit (50) to reduce the humidity. For example, silica gel is stacked as a dehumidifying material and placed it in front of the installation. In areas where the air is hot and humid already, the additional humidity caused by cool vapor coming out of the installation will be absorbed by the silicon. This reduces external humidity levels. This solution is flexible, low cost and easy to maintain.

The foregoing description is a specific embodiment of the present disclosure. It should be appreciated that this embodiment is described for purpose of illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the invention. Thus, any addition or omission of any of the components, or change in design can be made in order to improve its efficiency or cost effectiveness without impairing the main object of the invention. It is intended that all such modifications and alterations be included insofar as they come within the scope of the invention as claimed or the equivalents thereof.

Accordingly, the present invention is not intended to be limited by the recitation of the preferred embodiments but is to be defined by reference to the appended claims.

Non-Limiting experimental data:

Experiment 1:

In an experiment, the observation has been made on the efficiency of the system. The atmospheric temperature was 42 degree Celsius with 20% relative humidity. The room temperature was 38 degrees before operating the unit. The room is of size 8’ x 15’ in plan and 9’ height. The room has one openable window and a door and two walls were exposed to outside area with the roof being directly heated by sun. Water collected from the tap was at 38 degrees at room temperature. After leaving the water in the coolant collection tank for an hour, water temperature dropped to 21.3 degree Celsius. Surface temperature of the housing from outside was 24.5 degree Celsius and the temperature of the central vent was 23 degrees. The speed of air from the fan is 1 m/sec. Air temperature flowing out from outlet of the system was recorded to be 27.2 degrees Celsius with the inlet temperature being at 38 degrees Celsius.

The efficiency of the system of the present invention was compared with the existing air cooling systems of plastic and metal. Experiment 2:

Table 1: Comparative data on cooling efficiency of plastic, metal and terracotta housing

Equal amounts of water (800 mL) of water was taken in 3 containers of different material (plastic, metal and terracotta respectively) and the drop in surface temperature of the container and water temperatures were noted after every 30 minutes. It was observed that the drop in both surface and water temperatures was maximum in the case of terracotta container. This indicates terracotta is ideal for cooling of stored water.

Table 2: Comparative data on cooling efficiency of the system of the present invention with existing air cooling systems

Claims

CLAIMS:

1. A portable eco-friendly air cooling system (1) based on principles of

evaporative cooling for creating a cool microclimate in small spaces, said system comprising of:

— housing (5) made up of a substrate,

— plurality of air cooling units (10) made up of specific material and forming capillary cooling pads (11),

— a central vent or air passage (15),

— at least one frame (12) to contain plurality of air cooling pads (11),

— at least one coolant (20),

— at least one coolant collection tank (60),

— at least one source of incoming air (30),

— a motorized fan or blower (31),

— one or more sensors (40, 40a, 40b, 40c, .. 40n),

— an electronic control unit (45),

— a rotatable base controller device ,

— display unit (35)

wherein the plurality of air cooling units (10) are of specific shape and size and arranged in a specific manner to maximize the surface area needed for evaporative cooling, thereby reducing the speed and temperature of incoming hot air (30) to optimize contact surface area and contact time of the incoming hot air (30) with the coolant (20), thereby making the system energy efficient, sustainable, eco-friendly and cost-effective.

2. The system as claimed in claim 1 wherein said substrate making said housing (5) is a porous and durable material having high latent heat and absorption properties, said material being selected from terracotta, ceramic, metals like porous aluminum or a combination thereof, thereby increasing the cooling efficiency due to reduced temperature of the coolant (20) within the collection tank (60).

3. The system as claimed in claim 1 wherein said housing (5) comprises of coolant collection tank (60), central vent (15) and an opening at the top to pour the coolant inside the coolant collection tank (60).

4. The system as claimed in claim 1 wherein said specific material to make said plurality of air cooling units (10) is of biodegradable material capable of absorbing the coolant through capillary action, said specific material being selected from jute, paper, other natural fibres, either alone or in combination.

5. The system as claimed in claim 1 wherein said air cooling units (10) are stacked in a frame (12) to form one or more capillary cooling pads (11) such that the capillary cooling pads (11) fits the geometry of the central vent (15) with necessary adjustments to extend the pads (11) into the tank (60) through a hole (16) at the base of the central vent (15).

6. The system as claimed in claim 1 wherein said central vent (15) is of hollow tubular geometry conjoined at both ends, i.e. an inlet and an outlet of the central vent (15) with different diameter of the inlet and the outlet creating a pressure difference.

7. The system as claimed in claim 1 wherein said coolant collection tank (60) stores the coolant (20) wherein said coolant is selected from a substance with high thermal capacity, low viscosity, non-toxic, chemically inert, non- corrosive and low cost substance such as, but not limited to liquid water, betaine, nanofluids, sea water, salts or a combination thereof.

8. The system as claimed in claim 7 wherein said coolant (20) is purified water.

9. The system as claimed in claim 1 wherein the central vent (15) is configured to tightly grip a motorized fan or blower (31) either at the inlet or in between the plurality of air cooling pads (10) and configured to receive the incoming hot air (30) from inlet which flows out through outlet at the other end of the central vent (15).

10. The system as claimed in claim 1 wherein said frame (12) is made up of metal, preferably, of stainless steel, aluminum or natural materials such as bamboo or equivalent with high tensile strength configured to tightly grip the air cooling pads (11) and the motorized fan (31)

11. The system as claimed in claim 1 wherein said specific length and size of the air cooling pads (11) and geometry of central vent (15) is determined by known advanced computational analysis and modern calibration techniques to achieve optimized cooling.

12. The system as claimed in claim 1 wherein said coolant (20) is recycled at room temperature.

13. The system as claimed in claim 1 wherein said incoming source of air (30) is natural source of air or artificial source of air or recycled air or a combination thereof.

14. The system as claimed in claim 1 wherein said sensors (40, 40 a, 40b, 40c..) are configured to sense temperature, humidity or pressure or a combination thereof of the incoming stream of air (30) and the outgoing stream of air (32).

15. The system as claimed in claim 1 wherein said system further comprises of dehumidifying unit (50) to reduce humidity of the outgoing stream of air (32).

16. The system as claimed in claim 1 wherein said further comprises an air purifier.

17. The system as claimed in claim 1 wherein said electronic control unit (45) is configured at the base of the system (1) to collect data from the sensors (40, 40 a, 40b, 40c..) and control desired output for the user.

18. The system as claimed in claim 1 wherein said system further comprises filtration unit to filter the incoming stream of air at the inlet of the central vent (15) to cut the air pollutants and carbon particles.

19. The system as claimed in claim 1 wherein said system enables purification of incoming stream of air (30) by allowing the porosity of the material of the capillary cooling pads (11) to absorb carbon particles.

20. The system as claimed in claim 1 wherein said rotatable control device enables controlling speed and direction of the outgoing stream of air depending upon the position of user.

21. The system as claimed in claim 1 wherein said display unit (35) is preferably at the base of the system and display the data related to temperature, humidity or pressure, etc. as recorded by the sensors.

22. A method for the novel eco-friendly sustainable air cooling system (1) of claim 1 comprising the steps of:

a. stacking plurality of the air cooling units (10) in a specific manner in a frame (12) to form capillary cooling pads (11) within the central vent or air passage (15) configured to receive incoming stream of hot air (30);

b. pouring and storage of the coolant (20) in the coolant collection tank (60);

c. absorption of the coolant (20) by said substrate (25) of said housing (5) bringing down the temperature of the coolant (20); d. capillary absorption of the coolant (20) by the plurality of the air cooling pads (11) through the hole (16) at the base of the central vent

(15);

e. receiving said incoming hot stream of air (30) at the inlet using said motorized fan or blower (31), passing said hot stream of air (30) through said capillary cooling pads (11) bringing down the temperature of outing stream of air through the outlet;

f. collection of excess coolant (20) in the coolant collection tank (60), wherein said coolant (20) is absorbed by the air cooling units (10) arranged in a specific manner to form said capillary cooling pads (11) in order to maximize the surface area of said capillary cooling pads (11), thereby reducing the speed and temperature of incoming hot air (30) to optimize contact surface area and contact time of the incoming hot air (30) with the coolant (20), thereby cooling the outgoing stream of air in energy efficient, sustainable, eco-friendly and cost-effective manner.