Internal and external falling film heat exchanger and air conditioning system using same

Abstract

The internal and external falling film heat exchanger comprises an upper tube plate, a lower tube plate and multiple sets of heat exchange tubes, an upper solution box is arranged at the bottom of the upper tube plate, an upper refrigerant box is arranged at the top of the upper tube plate, a lower refrigerant box is arranged at the bottom of the lower tube plate, and a lower solution box is arranged on the side face of the lower tube plate. The bottom ends of the heat exchange tubes are communicated with the lower refrigerant box, the top ends of the heat exchange tubes sequentially penetrate through the upper solution box and the upper tube plate and are located in the upper refrigerant box, refrigerants can circulate between the upper refrigerant box and the lower refrigerant box along the heat exchange tubes, and in-tube falling film devices are installed at the top ends of the heat exchange tubes respectively. An out-tube falling film device is arranged between the periphery of each heat exchange tube and the shell of the upper solution box; the system comprises an absorption type circulation assembly, a solar driving circulation assembly, a cooling water circulation assembly and an electric compression circulation assembly. The problems that a traditional air conditioner is low in dehumidification efficiency, an existing solution dehumidification air conditioner is large in air resistance and large in occupied area, and an air source heat pump defrosting mode is low in efficiency are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning systems, and in particular to an internal and external falling film heat exchanger and an air conditioning system using the same. Background Art

[0002] The principle of using solutions for dehumidification is widely used. Concentrated solutions such as calcium chloride, lithium chloride, and lithium bromide solutions can absorb water vapor in the air to dehumidify the air. Concentrated solutions absorb water vapor in the air and release latent heat of condensation to increase the air temperature. Therefore, after dehumidification, the air needs to be cooled to achieve the purpose of refrigeration and dehumidification. After the concentrated solution absorbs water vapor in the air, it becomes a dilute solution. In order to continue the cycle, the dilute solution needs to be regenerated.

[0003] The invention patent application with publication number CN118149399A proposes an integrated temperature and humidity independently controlled solution dehumidification unit, which utilizes a solution dehumidification box, dehumidification filler and a switchable refrigeration and heating heat exchanger to reduce the temperature and humidity of the air in the cooling mode; in the heating mode, the solution in the dehumidification box is heated, and the high-temperature solution contacts the air, causing the air to be heated and humidified.

[0004] The invention patent application with publication number CN117606088A proposes an air handling device, a refrigeration device and a refrigeration system, which utilizes the principle of a breathable membrane, uses a dehumidification membrane assembly and a refrigeration heat exchanger to reduce the temperature and humidity of the air; uses the heat and air from the compressor exhaust to act on the regenerator, so that water vapor passes through the breathable membrane into the air to complete solution regeneration.

[0005] However, the above-mentioned conventional air conditioners usually need to lower the air temperature to below the dew point during the dehumidification process, and then discharge the condensed water in the air. Under this condition, the evaporation temperature of the air conditioner is low and the system operation efficiency is very low. At present, air source heat pumps face the problem of frosting when operating in winter. After the outdoor evaporator is frosted, the heat exchange efficiency is extremely poor and the system no longer heats. In the process of processing through the defrosting mode, electrical energy is consumed in vain, resulting in high energy consumption in system operation.

[0006] In view of the above reasons, the present invention proposes an internal and external falling film heat exchanger and an air conditioning system using the same to solve the above technical problems. Summary of the invention

[0007] The object of the present invention is to provide an internal and external falling film heat exchanger and an air conditioning system using the same, which can solve the problems of low dehumidification efficiency of traditional air conditioners, large air resistance of existing solution dehumidification air conditioners and low efficiency of air source heat pump defrosting mode.

[0008] On the one hand, the present invention provides an inside-outside falling film heat exchanger, comprising: an upper tube plate, a lower tube plate and a plurality of groups of heat exchange tubes installed in parallel therebetween, an upper solution tank is arranged at the bottom of the upper tube plate, an upper refrigerant tank is arranged at the top of the upper tube plate, a lower refrigerant tank is arranged at the bottom of the lower tube plate, a lower solution tank is arranged on the side of the lower tube plate, the bottom end of the heat exchange tube is connected with the lower refrigerant tank, the top end of the heat exchange tube passes through the upper solution tank and the upper tube plate in sequence and is located in the upper refrigerant tank, the refrigerant can flow between the upper refrigerant tank and the lower refrigerant tank along each of the heat exchange tubes, an in-tube falling film device is respectively installed at the top end of each of the heat exchange tubes, and an out-of-tube falling film device is respectively installed between the outer periphery of each of the heat exchange tubes and the outer shell of the upper solution tank.

[0009] Preferably, both ends of the heat exchange tube are respectively connected to the tube holes of the upper tube plate and the lower tube plate by expansion connection or expansion welding.

[0010] Preferably, the in-tube film falling device is a hollow structure, and an outer spiral groove is arranged on the outer periphery of the in-tube film falling device.

[0011] Preferably, the top of the outer tube film falling device is provided with a circle of folded edges, which can be installed in cooperation with the outer shell of the upper solution tank, and the interior of the outer tube film falling device is provided with an inner spiral groove.

[0012] Preferably, the outer-tube falling film device is located 30 mm-300 mm below the inner-tube falling film device.

[0013] Preferably, the upper refrigerant tank is welded to the upper tube plate, a primary refrigerant liquid inlet and a refrigerant gas outlet are provided on the top of the upper refrigerant tank, and a recirculating refrigerant liquid inlet is provided on the side of the upper refrigerant tank.

[0014] Preferably, a concentrated solution inlet and a vent are provided on the side wall of the upper solution tank, and a dilute solution outlet is provided at the bottom of the lower solution tank.

[0015] Preferably, the lower refrigerant tank is welded to the lower tube plate, and a recirculating refrigerant outlet is provided at the bottom of the lower refrigerant tank.

[0016] On the other hand, the present invention provides an air conditioning system using the above-mentioned internal and external falling film heat exchanger, including an absorption circulation component, a solar-driven circulation component, a cooling water circulation component and an electric compression circulation component;

[0017] The absorption circulation component includes a fan, a dilute solution pump, a first heat exchanger, a generating condenser, a condensate pump and a vacuum pump. The fan blows high-temperature and high-humidity air through the inner and outer falling film heat exchangers to absorb heat and dehumidify to form low-temperature and low-humidity air. The upper solution tank and the lower solution tank are respectively connected to the concentrated solution outlet and the dilute solution inlet of the first heat exchanger. The generating condenser is provided with a first heater and a second heater. The dilute solution outlet of the first heat exchanger is connected to the dilute solution inlet of the generating condenser. The concentrated solution outlet of the generating condenser is connected to the first heat exchanger through the concentrated solution pump. The condensate outlet of the generating condenser is connected to the inlet of the condensate pump. The outlet of the condensate pump is connected to the recovery device. The evacuation port of the generating condenser is connected to the air intake port of the vacuum pump. The exhaust port of the vacuum pump is connected to the atmosphere.

[0018] The solar-driven circulation assembly includes a solar collector panel and a hot water circulation pump, the hot water outlet of the solar collector panel is connected to the inlet of the second heater, the outlet of the second heater is connected to the inlet of the hot water circulation pump, and the outlet of the hot water circulation pump is connected to the cold water inlet of the solar collector panel;

[0019] The cooling water circulation assembly comprises a cooling water pump and a cooler, wherein the cooler is arranged in the condensation generator, the outlet of the cooling water pump is connected to the inlet of the cooler, the outlet of the cooler is connected to the inlet of a summer cooling tower and a winter heat user through a first valve and a second valve respectively, and the outlet of the summer cooling tower and the outlet of the winter heat user are connected to the inlet of the cooling water pump through a third valve and a fourth valve respectively;

[0020] The electric compression cycle component includes a compressor, a gas-liquid separator and a throttle valve. The exhaust port of the compressor is connected to the inlet of the first heater, and the outlet of the first heater is connected to the upper refrigerant tank through the throttle valve. The air inlet of the compressor is connected to the outlet of the gas-liquid separator, and the inlet of the gas-liquid separator is connected to the upper refrigerant tank. A refrigerant recirculation pump is connected between the upper refrigerant tank and the lower refrigerant tank. The flow rate of the refrigerant recirculation pump is controlled by frequency conversion through a liquid level sensor in the upper refrigerant tank to form an electric compression cycle.

[0021] Preferably, the structure of the gas-liquid separator is any one of a tubular type, a cyclone type and a ridge type.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The inside-outside falling film heat exchanger of the present invention is provided with an inside-outside falling film device and an outside-outside falling film device inside and outside the heat exchange tube, respectively. The refrigerant liquid falls and evaporates inside the heat exchange tube to absorb heat, and the concentrated solution falls and absorbs water vapor in the air outside the heat exchange tube to release heat. Through the above process, the high-temperature and high-humidity air is dehumidified and cooled outside the tube to form low-temperature and low-humidity air, thereby improving the cooling and dehumidification efficiency;

[0024] 2. When the air-conditioning system is in winter heating mode, the second valve and the fourth valve are opened, and the first valve and the third valve are closed. The solution of the falling film outside the tube of the inside-outside falling film heat exchanger absorbs the heat of the outdoor air and finally sends the heat to the winter heat users. The advantage is that the solution absorbs heat without causing frost accidents, and the system has high energy efficiency. In summer cooling and dehumidification mode, the first valve and the third valve are opened, and the second valve and the fourth valve are closed. The solution of the falling film outside the tube of the inside-outside falling film heat exchanger absorbs the heat in the high-temperature and high-humidity air and sends out low-temperature and low-humidity air. The advantage is that the evaporation temperature of the refrigerant evaporated by the falling film inside the tube of the inside-outside falling film heat exchanger is relatively high, and the air can be dehumidified without evaporating below the air dew point. The higher evaporation temperature makes the system energy efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of the internal and external falling film heat exchanger of the present invention;

[0027] Figure 2 It is a cross-sectional schematic diagram of the in-tube falling film device of the present invention;

[0028] Figure 3 It is a schematic diagram of the internal structure of the external tube falling film device in the present invention;

[0029] Figure 4 The working principle diagram of the air conditioning system of the present invention;

[0030] Description of reference numerals:

[0031] 1: Weak solution pump; 2: Internal and external falling film heat exchanger; 201: Lower solution tank; 2011: Weak solution outlet; 202: Lower refrigerant tank; 2021: Recirculating refrigerant outlet; 203: Lower tube sheet; 204: Upper solution tank; 2041: Concentrated solution inlet; 2042: Vent; 205: Upper tube sheet; 206: Upper refrigerant tank; 2061: Recirculating refrigerant inlet; 2062: Primary refrigerant inlet; 2063: Refrigerant outlet; 207: In-tube falling film device; 208: Out-tube falling film device; 20 9: heat exchange tube; 3: first heat exchanger; 4: first heater; 5: second heater; 6: hot water circulation pump; 7: solar collector; 8: condensate pump; 9: vacuum pump; 10: cooler; 11: condenser; 12: first valve; 13: summer cooling tower; 14: third valve; 15: second valve; 16: winter heat user; 17: fourth valve; 18: cooling water pump; 19: compressor; 20: concentrated solution pump; 21: gas-liquid separator; 22: throttle valve; 23: fan; 24: refrigerant recirculation pump. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] like Figure 1-3 As shown, the present invention provides an internal and external falling film heat exchanger and an air conditioning system using the same. The internal and external falling film heat exchanger 2 comprises: an upper tube sheet 205, a lower tube sheet 203 and a plurality of groups of heat exchange tubes 209 which are installed in a parallel and uniform manner and in a vertical state between the upper tube sheet 205 and the lower tube sheet 203. An upper solution tank 204 which is sealed and connected to the upper tube sheet 205 is arranged at the bottom, an upper refrigerant tank 206 is arranged at the top of the upper tube sheet 205, a lower refrigerant tank 202 is arranged at the bottom of the lower tube sheet 203, and a lower solution tank 201 is arranged on the side of the lower tube sheet 203. The upper tube sheet 205 and the lower tube sheet 203 are both provided with heat exchange tubes 209 which are connected to the upper tube sheet 205 and the lower tube sheet 203. The tube 209 is matched with the tube hole installed, the bottom end of the heat exchange tube 209 is connected with the lower refrigerant tank 202, the top end of the heat exchange tube 209 passes through the upper solution tank 204 and the upper tube plate 205 in sequence and is located in the upper refrigerant tank 206, the refrigerant can flow between the upper refrigerant tank 206 and the lower refrigerant tank 202 along each heat exchange tube 209, and cool the high-temperature air passing through the inner and outer falling film heat exchangers 2, the top end of each heat exchange tube 209 is respectively installed with an inner tube falling film device 207, and the outer tube falling film device 208 is respectively installed between the outer periphery of each heat exchange tube 209 and the outer shell of the upper solution tank 204. The inner tube falling film device 207 causes the refrigerant liquid in the heat exchange tube 209 to evaporate by falling film to absorb heat, and the outer tube falling film device 208 causes the concentrated solution in the upper solution tank 204 to absorb water vapor in the air by falling film outside the heat exchange tube 209 to release heat. Through this process, the high-temperature and high-humidity air is dehumidified and cooled outside the tube to form low-temperature and low-humidity air.

[0036] More specifically, both ends of the heat exchange tube 209 are respectively connected to the tube holes of the upper tube plate 205 and the lower tube plate 203 by expansion or expansion welding, ensuring that the relative positions of the heat exchange tube 209 and the upper tube plate 205 and the lower tube plate 203 do not change during operation.

[0037] like Figure 2 , 3As shown, the interior of the in-tube falling film device 207 is a hollow structure, and the outer peripheral surface of the in-tube falling film device 207 is provided with an outer spiral groove, which is inserted into the upper part of the tube of the multiple groups of heat exchange tubes 209, so that the inner wall of the multiple groups of heat exchange tubes 209 forms a falling film flow, and the refrigerant gas and excess refrigerant liquid can flow in the hollow parts such as the outer spiral groove. The inner surface of the outer tube falling film device 208 is provided with an inner spiral groove, and the top of the outer tube falling film device 208 is provided with a circle of folding edges, which can be inserted into the outside of the multiple groups of heat exchange tubes 209 and installed in conjunction with the outer shell of the upper solution tank 204, and the outer tube falling film device 208 is located 30mm-300mm below the in-tube falling film device 207, so that the outer wall of the multiple groups of heat exchange tubes 209 forms a falling film flow.

[0038] The upper refrigerant tank 206 is welded to the upper tube plate 205, and is provided with at least three openings. The top of the upper refrigerant tank 206 is provided with a primary refrigerant liquid inlet 2062 and a refrigerant gas outlet 2063, and the side of the upper refrigerant tank 206 is provided with a recirculating refrigerant liquid inlet 2061. The positions of the primary refrigerant liquid inlet 2062 and the recirculating refrigerant liquid inlet 2061 should avoid the refrigerant gas outlet 2063 and the upper part of the hollow part of the in-tube falling film device 207, so as not to interfere with the falling film flow in the tube.

[0039] The upper solution tank 204 is welded to the bottom of the upper tube sheet 205, and its bottom shell clamps the folded edge of the outer tube falling film device 208. The side wall of the upper solution tank 204 is provided with a concentrated solution inlet 2041 and a vent 2042, and the vent 2042 is connected to the atmosphere through an upward pipe. The lower solution tank 204 is arranged on the side of the lower tube sheet 203, and is used to collect the dilute solution after the film falls from the outside of the vertical heat exchange tube 209. The bottom of the lower solution tank 204 is provided with a dilute solution outlet 2011.

[0040] The lower refrigerant tank 202 is welded to the lower tube plate 203. A recirculating refrigerant liquid outlet 2021 is provided at the bottom of the lower refrigerant tank 202, and a refrigerant gas outlet may also be provided thereon.

[0041] The inside of the tube of the above-mentioned inner and outer falling film heat exchanger 2 is the refrigerant liquid falling film evaporation to absorb heat, and the outside of the tube is the concentrated solution falling film absorbing water vapor in the air to release heat. Through this process, the high-temperature and high-humidity air passing through it is dehumidified and cooled outside the tube to form low-temperature and low-humidity air.

[0042] On the other hand, the present invention provides an air conditioning system using the above-mentioned internal and external falling film heat exchanger, which, in addition to the above-mentioned internal and external falling film heat exchanger 2, also includes an absorption circulation component, a solar-driven circulation component, a cooling water circulation component and an electric compression circulation component;

[0043] like Figure 4As shown, the absorption cycle assembly includes a fan 23, a dilute solution pump 1, a first heat exchanger 3, a generating condenser 11, a condensate pump 8 and a vacuum pump 9, wherein the fan 23 is used to blow high-temperature and high-humidity air through the inner and outer falling film heat exchangers 2, and the refrigerant liquid in the tubes is evaporated by the falling film to absorb heat, and the concentrated solution falling film outside the tubes absorbs water vapor in the air to release heat, thereby absorbing heat and dehumidifying to form low-temperature and low-humidity air, and the upper solution tank 204 and the lower solution tank 201 are respectively connected to the concentrated solution outlet and the dilute solution inlet of the first heat exchanger 3. The dilute solution outlet 2011 of the lower solution tank 201 is connected to the inlet of the dilute solution pump 1, the outlet of the dilute solution pump 1 is connected to the dilute solution inlet of the first heat exchanger 3, the generating condenser 11 is formed by connecting a condenser and a generator, wherein a first heater 4 and a second heater 5 are arranged in the generator, the dilute solution outlet of the first heat exchanger 3 is connected to the dilute solution inlet of the generator of the generating condenser 11, and the flow rate of the dilute solution pump 1 is controlled by frequency conversion through the liquid level sensor of the lower solution tank 201. The concentrated solution outlet of the generator of the generating condenser 11 is connected to the first heat exchanger 3 through the concentrated solution pump 20, and the concentrated solution outlet of the first heat exchanger 3 is connected to the concentrated solution inlet 2041 of the internal and external falling film heat exchanger 2. The first heat exchanger 3 transfers the heat of the concentrated solution to the dilute solution, thereby improving the energy efficiency of the system. After the dilute solution enters the generator of the generating condenser 11, it is heated by the first heater 4 and the second heater 5 and then boils. The generated steam is condensed by the cooler 10 in the condenser of the generating condenser 11, thereby completing the regeneration process of the dilute solution. The condensate outlet of the generating condenser 11 is connected to the inlet of the condensate pump 8, and the outlet of the condensate pump 8 is connected to the recovery device for recovering condensate. The evacuation port of the condenser of the generating condenser 11 is connected to the air intake port of the vacuum pump 9, and the exhaust port of the vacuum pump 9 is connected to the atmosphere, which is used to maintain the vacuum degree of the generating condenser 11, improve the heat exchange coefficient of the condenser, improve the regeneration efficiency of the dilute solution after heating, and reduce the corrosion of the solution to the device. The fan 23 blows outdoor air into one side of the inner and outer falling film heat exchangers 2 and out of the other side, eventually forming an absorption cycle process.

[0044] The solar-driven circulation component includes a solar collector panel 7 and a hot water circulation pump 6, wherein the hot water outlet of the solar collector panel 7 is connected to the inlet of the second heater 5 in the generating condenser 11, the outlet of the second heater 5 is connected to the inlet of the hot water circulation pump 6, and the outlet of the hot water circulation pump 6 is connected to the cold water inlet of the solar collector panel 7. The solar collector panel 7 can absorb solar energy during the day and use it as heat energy for the second heater 5 to heat the dilute solution, thereby saving electric energy and forming a solar-driven circulation process.

[0045] The cooling water circulation component includes a cooling water pump 18 and a cooler 10 in a condenser of a condenser 11. The outlet of the cooling water pump 18 is connected to the inlet of the cooler 10. The outlet of the cooler 10 is connected to the inlets of a summer cooling tower 13 and a winter heat user 16 through a first valve 12 and a second valve 15 respectively. The outlet of the summer cooling tower 13 and the outlet of the winter heat user 16 are connected to the inlet of the cooling water pump 18 through a third valve 14 and a fourth valve 17 respectively, forming a cooling water circulation process.

[0046] The electric compression cycle component includes a compressor 19, a gas-liquid separator 21 and a throttle valve 22, wherein the exhaust port of the compressor 19 is connected to the inlet of the first heater 4, the outlet of the first heater 4 is connected to the primary refrigerant liquid inlet 2062 of the upper refrigerant tank 206 through the throttle valve 22, the air inlet of the compressor 19 is connected to the outlet of the gas-liquid separator 21, the inlet of the gas-liquid separator 21 is connected to the refrigerant air outlet 2063 of the upper refrigerant tank 206, and a refrigerant recirculation pump 24 is connected between the upper refrigerant tank 206 and the lower refrigerant tank 202, the inlet of the refrigerant recirculation pump 24 is connected to the recirculating refrigerant liquid outlet 2021 of the inner and outer falling film heat exchangers 2, and the outlet of the refrigerant recirculation pump 24 is connected to the recirculating refrigerant liquid inlet 2061 of the inner and outer falling film heat exchangers 2, and the flow rate of the refrigerant recirculation pump 24 can be controlled by frequency conversion through the liquid level sensor in the upper refrigerant tank 206 to form an electric compression cycle process.

[0047] In this embodiment, the structure of the gas-liquid separator 21 is any one of a tubular type, a cyclone type and a ridge type.

[0048] The regulation process of the air conditioning system of the present invention is as follows: in winter heating mode, the second valve 15 and the fourth valve 17 are opened, and the first valve 12 and the third valve 14 are closed. After the solution of the falling film outside the tube of the inner and outer falling film heat exchanger 2 absorbs the heat of the outdoor air, the heat is finally sent to the winter heat user 16. The advantage is that the solution absorbs heat without causing frost accidents, and the system has high energy efficiency;

[0049] In the summer cooling and dehumidification mode, the first valve 12 and the third valve 14 are opened, and the second valve 15 and the fourth valve 17 are closed. The solution of the falling film outside the tube of the internal and external falling film heat exchanger 2 absorbs the heat in the high-temperature and high-humidity air and sends out the low-temperature and low-humidity air. The advantage is that the refrigerant evaporating from the falling film inside the tube of the internal and external falling film heat exchanger 2 has a high evaporation temperature, and the air can be dehumidified without evaporating below the air dew point. The higher evaporation temperature makes the system energy efficient. In addition, compared with traditional air conditioners, it occupies less space.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An internal and external falling film heat exchanger, characterized in that: include: An upper tube sheet, a lower tube sheet and multiple groups of heat exchange tubes installed in parallel therebetween, an upper solution tank is arranged at the bottom of the upper tube sheet, an upper refrigerant tank is arranged at the top of the upper tube sheet, a lower refrigerant tank is arranged at the bottom of the lower tube sheet, and a lower solution tank is arranged on the side of the lower tube sheet, the bottom end of the heat exchange tube is connected with the lower refrigerant tank, the top end of the heat exchange tube passes through the upper solution tank and the upper tube sheet in sequence and is located in the upper refrigerant tank, the refrigerant can flow between the upper refrigerant tank and the lower refrigerant tank along each of the heat exchange tubes, an in-tube falling film device is respectively installed at the top end of each of the heat exchange tubes, and an out-of-tube falling film device is respectively installed between the outer periphery of each of the heat exchange tubes and the outer shell of the upper solution tank.

2. The internal and external falling film heat exchanger according to claim 1, characterized in that: The two ends of the heat exchange tube are respectively connected to the tube holes of the upper tube plate and the lower tube plate by expansion connection or expansion welding.

3. The internal and external falling film heat exchanger according to claim 1, characterized in that: The in-tube film falling device is a hollow structure, and an outer spiral groove is arranged on the outer periphery of the in-tube film falling device.

4. The internal and external falling film heat exchanger according to claim 1, characterized in that: The top of the outer tube film falling device is provided with a circle of folded edges, which can be installed in cooperation with the outer shell of the upper solution box, and the interior of the outer tube film falling device is provided with an inner spiral groove.

5. The internal and external falling film heat exchanger according to claim 1, characterized in that: The outer-tube falling film device is located 30 mm to 300 mm below the inner-tube falling film device.

6. The internal and external falling film heat exchanger according to claim 1, characterized in that: The upper refrigerant tank is welded to the upper tube plate, a primary refrigerant liquid inlet and a refrigerant gas outlet are arranged on the top of the upper refrigerant tank, and a recirculating refrigerant liquid inlet is arranged on the side of the upper refrigerant tank.

7. The internal and external falling film heat exchanger according to claim 1, characterized in that: A concentrated solution inlet and a vent hole are provided on the side wall of the upper solution tank, and a dilute solution outlet is provided at the bottom of the lower solution tank.

8. The internal and external falling film heat exchanger according to claim 1, characterized in that: The lower refrigerant tank is welded to the lower tube plate, and a recirculating refrigerant outlet is provided at the bottom of the lower refrigerant tank.

9. An air conditioning system using the internal and external falling film heat exchanger according to any one of claims 1 to 8, characterized in that: It includes absorption circulation components, solar-driven circulation components, cooling water circulation components and electric compression circulation components; The absorption circulation component includes a fan, a dilute solution pump, a first heat exchanger, a generating condenser, a condensate pump and a vacuum pump. The fan blows high-temperature and high-humidity air through the inner and outer falling film heat exchangers to absorb heat and dehumidify to form low-temperature and low-humidity air. The upper solution tank and the lower solution tank are respectively connected to the concentrated solution outlet and the dilute solution inlet of the first heat exchanger. The generating condenser is provided with a first heater and a second heater. The dilute solution outlet of the first heat exchanger is connected to the dilute solution inlet of the generating condenser. The concentrated solution outlet of the generating condenser is connected to the first heat exchanger through the concentrated solution pump. The condensate outlet of the generating condenser is connected to the inlet of the condensate pump. The outlet of the condensate pump is connected to the recovery device. The evacuation port of the generating condenser is connected to the air intake port of the vacuum pump. The exhaust port of the vacuum pump is connected to the atmosphere. The solar-driven circulation assembly includes a solar collector panel and a hot water circulation pump, the hot water outlet of the solar collector panel is connected to the inlet of the second heater, the outlet of the second heater is connected to the inlet of the hot water circulation pump, and the outlet of the hot water circulation pump is connected to the cold water inlet of the solar collector panel; The cooling water circulation assembly comprises a cooling water pump and a cooler, wherein the cooler is arranged in the condensation generator, the outlet of the cooling water pump is connected to the inlet of the cooler, the outlet of the cooler is connected to the inlet of a summer cooling tower and a winter heat user through a first valve and a second valve respectively, and the outlet of the summer cooling tower and the outlet of the winter heat user are connected to the inlet of the cooling water pump through a third valve and a fourth valve respectively; The electric compression cycle component includes a compressor, a gas-liquid separator and a throttle valve. The exhaust port of the compressor is connected to the inlet of the first heater, and the outlet of the first heater is connected to the upper refrigerant tank through the throttle valve. The air inlet of the compressor is connected to the outlet of the gas-liquid separator, and the inlet of the gas-liquid separator is connected to the upper refrigerant tank. A refrigerant recirculation pump is connected between the upper refrigerant tank and the lower refrigerant tank. The flow rate of the refrigerant recirculation pump is controlled by frequency conversion through a liquid level sensor in the upper refrigerant tank to form an electric compression cycle.

10. The air conditioning system using the internal and external falling film heat exchanger according to claim 9, characterized in that: The structure of the gas-liquid separator is any one of a tubular type, a cyclone type and a ridge type.

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