WO2022043978A1

WO2022043978A1 - Cooling apparatus with hybrid cooling cycle and closed water cycle with double wall heat transfer system

Info

Publication number: WO2022043978A1
Application number: PCT/IB2021/059418
Authority: WO
Inventors: Esmaeil ABOUTALEBIAN ELYADERANI
Original assignee: Aboutalebian Elyaderani Esmaeil
Priority date: 2021-10-13
Filing date: 2021-10-13
Publication date: 2022-03-03

Abstract

Cooling Apparatus with Hybrid Cooling Cycle and Closed Water Cycle with Double Wall Heat Transfer System comprising a main body (12),a compression refrigeration unit (20),an evaporative cooling unit (30) and a tube heat transfer system (40) in which the distilled water produced in the compression refrigeration unit transferred to the water tank, is used to cool the condenser, moisten the cooling pads and prevent the evaporator from freezing.

Description

Title of Invention : Cooling Apparatus with Hybrid Cooling Cycle and Closed Water Cycle with Double Wall Heat Transfer System

Technical Field

[0001] The present invention is related to air conditioners and heat exchange systems, especially hybrid air conditioning and cooling apparatus, which works on the basis of compression refrigeration cycle and evaporative cooling cycle.

Background Art

[0002] Air conditioners are used for providing the cooling as well as heating effect, controlling humidity and reducing air pollution entering the building environment, which in an independent type includes condensing coolers, evaporative coolers, etc.

[0003] Several components are used in the structure of condensing coolers, which use a compression refrigeration cycle for cooling, such as compressor, condenser, expansion valves and evaporator.

[0004] In this type of cooling operates on the basis of a compression refrigeration cycle, a compressor that operates by an actuator such as an engine and is used for circulating gas in the refrigeration cycle. A condenser is a heat exchanger or cooling coil by which the cooling gas in the refrigerant circulation pipes in the network is compressed and pressurized to the evaporator coil. The liquid refrigerant released from the condenser coil passes through the capillary tube or expansion valve and experiences a severe pressure drop and a decrease in saturation temperature. The evaporator then transfers the heat to the refrigerant gas and causes it to evaporate. This process is common in gas coolers.

[0005] In traditional condensing coolers, the condenser is located outside of main body, so the higher the ambient temperature and the direct and prolonged exposure to the sun, the lower the efficiency of the compressor and consequently the gas cooler, and may eventually cause loss of insulation and short circuit in the compressor and thus break down of the air conditioner. [0006] Also, large plumbing between the evaporator and the condenser causes energy to be wasted in the pipe path as well as the evaporator freezing and reduces the performance of the air conditioner. On the other hand, the cold (distilled) water produced by the evaporator, which consumes a lot of electricity to produce it, is wasted while it can be used optimally.

[0007] Evaporative cooling systems, consist of a centrifugal fan that moves the air radially and increases speed of air flow using rotating impellers. The air is directed to the duct through this fan and the water is directed to the cooling pads by the pump and the water evaporation process takes place. The heat energy of the air is absorbed through evaporation and as a result the air temperature drops. Also, the water that evaporates mixes with the air and the humidity of the air increases. Therefore, these systems have the ability to increase humidity and decrease temperature simultaneously. High electricity and water consumption include the obvious disadvantages of these air conditioners. In addition to the evaporative performance reason, these types of systems increase the humidity in the air and are not suitable for areas with high humidity and cannot provide optimal comfort conditions and temperatures.

Summary of Invention

[0008] In the present document, the cooled distilled water produced by the evaporator is pumped on the cooling pads and uses the evaporative cooling principle to cool the air in the first stage. The evaporator is located on the fan outlet of the present apparatus, and in the second step of air cooling, which is the passage of air through the evaporator, the refrigerant in the evaporator tubes absorbs the heat of the air flowing through the centrifuge to bring the two-phase refrigerant to gas conversion, which due to this heat exchange, the air temperature decreases in the second step and enters the building through the opening. On the other hand, in the present document, water and tubes are cooled due to this change of refrigerant phase inside the evaporator tubes, and hot air with high humidity hits the cooled evaporator tubes and changes the phase turning into liquid. The distilled and cooled water produced is poured into a chamber at the bottom of the evaporator and from there returns to the main tank. The closed cycle of cooled distilled water output from the compression refrigeration cycle, which causes the cooling pads or the condenser to cool down. [0009] In addition, in present apparatus, the condenser is placed inside the main body along with other components of the cooling device, and a number of fans are used to cool it in the first stage, when the operating temperature of the condenser has not exceeded a certain level. The present apparatus has a tubular heat transfer system in which ambient air enters the device from its inner wall and is circulated by the fan and it is directed to the condenser and is heated by passing through it and discharged into the environment by the suction fan and the outer wall.

Brief Description of Drawings

[0010] [Fig.1 ] shows a schematic view of the hybrid cooling apparatus.

[0011] [Fig.2] shows a perspective view of the exterior of the hybrid cooling apparatus in the current document.

[0012] [Fig.3] shows a perspective view of interior components of hybrid cooling apparatus.

[0013] [Fig.4] shows a side view of interior components of hybrid cooling apparatus.

[0014] [Fig.5] shows another perspective view of interior components of hybrid cooling system in which the water distribution system is shown clearly.

[0015] [Fig.6] shows a perspective view of condenser cooling components and tubular heat transfer system.

[0016] [Fig.7] shows a schematic view of condenser cooling systems and tubular heat transfer system.

Description of Embodiments

[0017] The hybrid cooling apparatus (10) consists of a main body (12) with different sizes depending on the climatic conditions of the environment, which has two separate internal parts for placing the equipment of compression refrigeration unit (20) and evaporative cooling unit(30) are separated by a panel (16). The body(12) of the apparatus has open sides for air entry and suction, which is covered with louvered section(18) and on each of them at least one layer of the evaporative pad (38) is placed.

[0018] Evaporative cooling system unit (30) is located in the lower part and compression refrigeration system equipment (20) is located in the upper part of the device, and this does not mean that the processes are separate and the device has a single combined refrigeration cycle.

[0019] The present apparatus (10) is a cooler with two-way cooling system and a combination of compression refrigeration unit(20) and evaporative cooling unit (30) which reduces the air temperature in two steps, including passing air through cooling pads moistened with cooled distilled water and the passage of air through the evaporator.

[0020] The device (10) has a tank of distilled water (31 ) that to start the apparatus (10) you can manually pour a certain volume of distilled water into it (31 ) (do not fill). As can be seen, the water cycle inside the device is a closed cycle, which means that the device does not need a water supply line for cooling, unlike conventional evaporative cooling systems, and it uses distilled water produced and cooled during the use of the apparatus (10) in the compression refrigeration cycle (20).

[0021 ] Distilled water collected in the tank (31 ) is transferred to the multi-way valve (37) by a fluid handling system such as a pump (35) and from there it is poured on the evaporative pad (38). The pouring may occur in the form of drops, sprays or any other liquid forms. Humidifying the evaporative pad (38) with cooled distilled water increases the performance of the apparatus(10) in the evaporative cooling section (30), which means that the ambient air temperature passes through the evaporative pad(38) located in the nozzles of the cooler is further reduced (18) instead of water at room temperature (similar to what happens in conventional evaporative cooling systems), moistened with cold water. The cooling process is improved by the apparatus (10) and the apparatus(10) can have adequate cooling in unfavorable environmental conditions for the use of evaporative cooling devices and produce air with a temperature in the comfort range.

[0022] The cooled distilled water produced by the compression refrigeration unit (20), in addition to moistening the pads (38), also helps to cool the condenser (22). As mentioned above, all the equipment of the compression refrigeration system (20), unlike conventional gas cooler models, whose condenser is located at a distance from the machine and in the open environment, are all gathered in one body (12). One of the ways to cool the condenser (22) in the present device is to use cooled distilled water in such a way that one of the branches coming out of the multi-way valve sprays distilled water on the condenser (22). This is done by installing a water distributor (46) as a spray device on the corresponding hose (d36). The water spray hose (d36) on the condenser is also connected to a solenoid valve (47) and if necessary and when the operating temperature of the condenser exceeds a certain limit, this cooling system is activated and at other times disabled.

[0023] Accordingly, distilled water is produced in the compression refrigeration unit

(20). In the compression refrigeration unit (20), the present device flows like conventional samples, refrigerant or coolant, which can be R-134 or other common refrigerants. The refrigerant is circulated by the compressor (24) in the compression refrigeration cycle and compressed by the condenser (22) and enters the expansion valve (23) in the liquid state and then enters the evaporator

(21 ) and there, it evaporates due to heat exchange with the ambient air, and due to this heat exchange and during the evaporation process, the ambient air temperature decreases in the second step and enters the building through the air outlet (14).

[0024] Therefore, the evaporator tubes (21 a) also cool down due to the heat exchange between the ambient air and the refrigerant in the evaporator tubes (21 a) and the evaporation of the refrigerant. The moisture in the ambient air is distilled and turned into water by contact with these cold pipes (21 a). This water comes out of the evaporator (21 ) and collects in the chamber (26) installed in the lower part of it. It is then guided by a hose (27) to the main tank (31 ).

[0025] The condenser (22) in this apparatus (10) is located in the compression refrigeration system (20) and in the upper part of it, and as mentioned, it cools the compressed gas refrigerant in the compressor (24) and releases its heat to the environment. The fan located on the back of the condenser cool the condenser

(22) in other way. In this device, an evaporator (21 ) is installed on the outlet of the blower (32). The location of the evaporator (21 ) in this place increases the amount of heat transfer between the ambient air and the refrigerant inside the evaporator tubes (21a), which ultimately improves the performance of the apparatus (10). [0026] The apparatus which is described in the present document is a combination of compression refrigeration systems (20) and evaporative cooling system (30). As mentioned, high water consumption is one of the disadvantages of the evaporative cooling system, but the present apparatus( ) does not require continuous feeding of fresh water, instead the apparatus(10) uses cold water produced by the evaporator (21 ) for the initial cooling of ambient air.

[0027] Air cooling in the first step or in the initial stage is such that the water pump (35) installed inside the main tank (31 ), transfers the water through water distribution line (36a, 36b, 36c) on the evaporative pad(38) . The moisturizing water of the pads is distilled and cooled. In other words, it is water that has been used to reduce its temperature in the compression refrigeration cycle. One of the differences between the apparatus described in present document and conventional evaporative cooling systems is the temperature of the water transferred to the evaporative pad (38), which because the apparatus described in present document uses distilled water at a much lower temperature than water at room temperature, during the evaporation process, the apparatus(10) is able to further reduce the ambient air temperature, which improves the performance of the apparatus(10).

[0028] Following the initial cooling of the air in the first step, the blower (32) is rotated by the electric motor (33) and the transmission system including belts and pulleys (34) and causes the flow of air (hot and humid) from the environment to inside the apparatus(10). The air passes through the grooves in the inlet louvers (18) and through the holes of the evaporative pad (38) and is cooled by the evaporative cooling principles.

[0029] In the second step of air cooling, which is in the form of passing air through the evaporator, the refrigerant in the evaporator tubes (21 ) absorbs the heat of the air flowing through the blower(32) to convert the two-phase refrigerant into gas, which as a result of this exchange the air temperature drops in the second step and enters the user space or building through the opening (14). The tubes (21 a) also cool down as the result of this phase change occurring inside the evaporator tubes (21 ). [0030] In hot and humid regions, evaporative cooling systems have poor performance, but the apparatus (10) solves this problem and is designed to suit these weather conditions. In these regions, hot air with high humidity hits the cooled evaporator tubes (a21) and changes phase and liquefies. Distilled water is removed from the evaporator (21 ) and collected in a chamber (26) installed at the bottom. The distilled water leaves evaporator and is collected in the container (26) installed in the lower part of chamber. The distilled water collection chamber has a hole in the bottom of the body and the water collected in it is directed by a hose (27) to the main tank (31 ).

[0031] Condensers are of different types and in systems that use the compression refrigeration unit such as condensed cooler, are usually installed outside the building and are cooled by the open air flow of the environment. Condenser (22) in the apparatus(10), the condenser is placed inside the main body along with other components of the cooling apparatus, and a number of fans are used to cool it in the first stage, when the operating temperature of the condenser has not exceeded a certain level. The apparatus(10) has a tubular heat transfer system in which ambient air enters the device from its inner wall and is rotated by the fan and it is directed to the condenser and is heated by passing through it and discharged into the environment by the suction fan and the outer wall.

[0032] The apparatus has a thermal sensor(not shown) that measures the operating temperature of the condenser and if the temperature exceeds a certain limit, the cooled distilled water flow produced in the compression refrigeration cycle is used to cool the condenser. The heat sensor, depending on the operating temperature range of the condenser, commands the flow control valve to direct the flow of water with a certain flow to the condenser, and thus water with a certain flow is sprayed on the condenser in drops. All electronic apparatus such as fans, compressors, valves, sensors, etc. operate using the electrical panel installed in the cooling set and according to the control board program. For example, for a heat sensor that measures the operating temperature of a condenser, a certain temperature range is programmed that allows cooling with a stream of cooled distilled water only if the condenser temperature exceeds a certain limit. This sensor is located at the output of the condenser before the current enters the expansion valve. [0033] Accordingly, the cooled distilled water produced in the compression refrigeration cycle is poured into the tank. Inside the main tank is a water level sensor(not shown). The produced cold water is first used to cool the cooling pads and only if the temperature of the condenser exceeds a certain level detected by the heat sensor, the water flow is used to cool the condenser. If the distilled water level in the tank was less than a certain limit, the distilled water source can be used to feed it, and if it is more than the specified limit, it can be drained from the outlet valve.

[0034] A tubular heat transfer system (40) is used to cool the condenser (22), which consists of an inner wall (41 ) and an outer wall(42), a separator piece (43) and a filter (50) with two inner walls. The two inner (41 ) and outer (42) walls are concave and centered, and the outer wall has an L-shaped branch with a certain length that extends to the front of the condenser (49) and in this system to reduce heat transfer between the pipes, their surfaces are impregnated with an insulating coating such as insulating paint. The direction of flows in the inputs and output of this heat exchange system are opposite to each other and the inner wall outlet (41 b) and the outer wall inlet (42a) on one side at the back (48) and front (49) of the condenser (22) and on the other hand, it is a concentric tube. The separator piece (43) in this set (40) connects the inner and outer thermal walls (41 and 42) in such a way that first the walls (41 and 42) can transfer the desired air currents as an interconnected system and secondly, the air flow does not leak and is completely separate. The filter (50) in this system (40) traps possible dust in the ambient air and prevents it from entering the refrigeration cycle, especially the condenser.

[0035] In this apparatus using the tube heat transfer system (40), cool air can be transferred from the outside of the building through the inner wall (41 ) to the back of the condenser (22). Cool air (temperature lower than the temperature of the condenser coils) that is transferred to the back of the condenser is blown by the fan (44) and blown into the condenser (22) and passage through the heat transfer tubes (22a) occurs due to heat exchange heats it up and cools the condenser tubes (22a). It is mandatory to use a fan (44) on the back of the condenser (48) to circulate air and increase the heat transfer rate. [0036] The condenser heat dissipation system (22) to the environment is such that the inlet of the outer wall (42a) is located in front of the condenser (49) and the hot air produced by the passage of cool ambient air through the condenser hot heat pipes is sucked in by another fan (45) mounted vertically and in line with the outer wall (42) and discharged into the environment. The hot air discharged into the environment, due to the temperature higher than the ambient temperature, moves quickly and it is not possible to enter it from the inner wall (41 ).

[0037] The second way is to use the distilled and cooled water produced by the evaporator. The distilled cold water, which is described in the production method, is pumped from the main tank (31 ) with the help of a pump (35), where it passes through a multi-way valve (37), solenoid valve (47) and a water distributor (46) and is sprayed on the condenser (22). The water spray in this section is regulated by the solenoid valve (47) and based on the operating temperature of the condenser (22), so that if this temperature increases, the solenoid valve (47) is commanded to cool water for a specified period of time (22) so this is not a permanent method and will only be activated if needed and the condenser temperature rises above a certain level. Note that cold water cooling in this section does not mean the use of cold water condenser, but here a cool air condenser is used, which due to the increase in temperature, excess heat is dissipated by spraying water on the heating coils.i

Claims

[Claim 1] Hybrid refrigeration cycle cooling system with double wall heat dissipation system and closed water circulation system comprising: a main body(12) that all components are placed inside the said body and has at least one air inlet and at least one air outlet, a compression refrigeration unit(20) comprising a condenser(22), an evaporator(21 ), an expansion valve(23) and a compressor(24), an evaporative cooling unit(30) comprising a water tank(31 ), evaporative pads(38), a pump(35) and a blower(32), in which the evaporator is located on the outlet of the blower and connects the two said units in which apparatus(10) reduces the air temperature in two steps, including passing air through thr evaporative pads moistened with cooled distilled water and passing air through the evaporator, and a tube heat transfer system (40) that comprising of two walls and a filter(50) in which the heated exhaust air is blown into the environment and the fresh air comes into apparatus body, in which the distilled water produced in the compression refrigeration unit transferred to the water tank, is used to cool the condenser, moisten the cooling pads and prevent the evaporator from freezing.

[Claim 2] Hybrid refrigeration cycle cooling system according to claim 1 , further has a thermal sensor which measures the operating temperature of the condenser and if the temperature exceeds a certain limit, the cooled distilled water flow which is produced in the compression refrigeration cycle is used to cool the condenser.

[Claim 3] Hybrid refrigeration cycle cooling system according to claim 1 , further has an electrical panel which controls all electronic device used in apparatus (10).

[Claim 4] Hybrid refrigeration cycle cooling system according to claim 1 , in which the distilled cold water is pumped from the main tank (31) by pump (35), passes through a multi-way valve (37) and a water distributor (46) and is sprayed on the condenser (22).

[Claim 5] Hybrid refrigeration cycle cooling system according to claim 1 , in which the two inner (41 ) and outer (42) walls are concave and centered, and the outer wall has an L-shaped branch with a certain length that extends to the front of the condenser (49).

[Claim 6] Hybrid refrigeration cycle cooling system according to claim 1 , in which distilled water is removed from the evaporator (21 ) and collected in a chamber (26).

[Claim 7] Hybrid refrigeration cycle cooling system according to claim 1 and 7, in which the distilled water collection chamber has a hole in the bottom of the body and the water collected in it is directed by a hose (27) to the main tank (31 ).

[Claim 8] Hybrid refrigeration cycle cooling system according to claim 1 , in which the distilled water source can be used to feed the tank, if the distilled water level in the tank was less than a certain limit.