Methods for dehumidification and heat recovery in indoor swimming pools during summer

Abstract

This application discloses a method for dehumidification and heat recovery in indoor swimming pools during summer. The heat exchange equipment implementing the method includes: a sensible heat exchanger, a compressor, a gas-liquid separator, a first heat exchanger, a first evaporator, and a second evaporator. The method includes: first indoor return air being cooled and dehumidified by the second evaporator before being supplied to the room; the first indoor return air being cooled and dehumidified sequentially by the second evaporator and the first evaporator, then mixed with outdoor fresh air cooled and dehumidified by the sensible heat exchanger, and then supplied to the room; second indoor return air being heated by the sensible heat exchanger before being exhausted to the outside, or second indoor return air being heated by the sensible heat exchanger and the first heat exchanger before being exhausted to the outside. This method can control the humidity of the indoor swimming pool and improve the efficiency of heat recovery.

Description

Technical Field

[0001] This application relates to the field of heat recovery technology, and in particular to a method for dehumidifying and recovering heat in indoor swimming pools during the summer. Background Technology

[0002] Most of the heat loss in indoor swimming pools is due to the evaporation of water from the pool surface into water vapor. The heat of the pool water is carried into the pool air by the water vapor, which greatly increases the enthalpy and humidity of the air. Since the pool water contains toxic gases such as chlorine, the pool needs to be ventilated. However, if the air in the pool is directly exhausted, it will result in a large loss of enthalpy (i.e., energy loss).

[0003] The relative humidity in a swimming pool should generally be maintained between 65% and 85%. Too low a relative humidity will lead to faster evaporation from the pool surface and the human body, making people feel colder. Too high a relative humidity will also increase the discomfort of people and make it easy for condensation to form on the outer enclosure structure, thereby reducing the service life and thermal insulation performance of the enclosure structure. Therefore, it is necessary to control the humidity of the swimming pool. If the heat from dehumidification is not recovered, it will also cause a large energy loss.

[0004] Based on the above characteristics of swimming pools, there are many existing technical methods for heat recovery from the exhaust air of swimming pools in summer. For example, the heat pump condensation heat recovery method involves cooling and dehumidifying the indoor return air through the evaporator and then recovering the heat to the condenser. The heat is then used by the condenser for dehumidification, reheating, and heating of the pool water. However, the heat recovery efficiency is low and needs to be further improved. Summary of the Invention

[0005] Based on this, a method for dehumidification and heat recovery in indoor swimming pools during summer is provided, which controls the air humidity of the indoor swimming pool on the one hand, and improves the efficiency of heat recovery on the other.

[0006] A method for dehumidification and heat recovery in indoor swimming pools during summer, wherein the heat exchange equipment for implementing the method includes:

[0007] Sensible heat exchanger;

[0008] A compressor having a first inlet, a second inlet, a third inlet, and an outlet for refrigerant flow;

[0009] A gas-liquid separator for refrigerant gas-liquid separation, having an inlet, a gas outlet, and a liquid outlet, wherein the gas outlet is connected to a third inlet of the compressor;

[0010] The first heat exchanger has a refrigerant inlet connected to the compressor outlet and a refrigerant outlet connected to the gas-liquid separator inlet.

[0011] The first evaporator has a refrigerant inlet connected to the liquid outlet of the gas-liquid separator, and the refrigerant outlet of the first evaporator is connected to the first inlet of the compressor.

[0012] The second evaporator has its refrigerant inlet connected to the liquid outlet of the gas-liquid separator, and its refrigerant outlet connected to the second inlet of the compressor.

[0013] The method includes:

[0014] The first indoor return air is cooled and dehumidified by the second evaporator before being supplied to the room;

[0015] The first indoor return air is cooled and dehumidified by passing through the second evaporator and the first evaporator in sequence. Then, it is mixed with the outdoor fresh air that has been cooled and dehumidified by the sensible heat exchanger and then supplied to the room.

[0016] The return air in the second room is heated by the sensible heat exchanger and then exhausted to the outside, or the return air in the second room is heated by the sensible heat exchanger and the first heat exchanger in sequence and then exhausted to the outside.

[0017] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0018] Optionally, the heat exchange equipment further includes a pool hot water heat exchanger, wherein the refrigerant inlet of the pool hot water heat exchanger is connected to the outlet of the compressor, and the refrigerant outlet of the pool hot water heat exchanger is connected to the inlet of the gas-liquid separator.

[0019] Optionally, the heat exchange equipment further includes an outdoor condenser, the refrigerant inlet of which is connected to the outlet of the compressor, and the refrigerant outlet of which is connected to the inlet of the gas-liquid separator.

[0020] Optionally, at least one of the following two methods can be used for heat and humidity control:

[0021] (1) Control the air volume of the return air in the first room;

[0022] (2) Adjust the air volume of the first evaporator and the second evaporator. Optionally, the return air in the first room is cooled to 10-15°C by the second evaporator before entering the first evaporator.

[0023] Optionally, the first indoor return air is cooled to 0-10°C by passing through the second evaporator and the first evaporator in sequence, and then mixed with the outdoor fresh air that has been cooled and dehumidified by the sensible heat exchanger.

[0024] Optionally, the outdoor fresh air is cooled to 26–32°C after passing through a sensible heat exchanger.

[0025] Optionally, the return air in the second room is heated to 28-32°C after passing through a sensible heat exchanger before entering the first heat exchanger.

[0026] Optionally, the enthalpy of the outdoor exhaust air is greater than or equal to the enthalpy of the outdoor fresh air.

[0027] This application improves the condensation heat recovery method for indoor swimming pools in summer. On the one hand, it increases the evaporation temperature, thereby improving the overall system efficiency. On the other hand, it introduces fresh air to improve indoor air quality and regulate indoor air humidity load. Attached Figure Description

[0028] Figure 1 A schematic diagram of the structure of a heat exchange device for implementing a summer dehumidification and heat recovery method for indoor swimming pools;

[0029] Figure 2 A schematic diagram illustrating a method for dehumidifying and recovering heat from an indoor swimming pool in summer;

[0030] Figure 3 This is a schematic diagram of the refrigerant circulation.

[0031] Figure 4a An enlarged view of the enthalpy-humidity diagram of the airflow supplied in the dehumidification and heat recovery process for indoor swimming pools during summer;

[0032] Figure 4b An enlarged view of the enthalpy-humidity diagram of the return air in the dehumidification and heat recovery process of an indoor swimming pool during summer;

[0033] Figure 4c This is an enlarged view of the enthalpy-humidity diagram of the exhaust air in the dehumidification and heat recovery process of an indoor swimming pool during summer. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that when a component is said to be "connected" to another component, it can be directly connected to the other component or it can be connected to a component in between. When a component is said to be "set on" another component, it can be directly set on the other component or it may be set to a component in between.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] See Figure 1 , Figure 2 As shown, a method for dehumidification and heat recovery in an indoor swimming pool during summer, wherein the heat exchange equipment for implementing the method includes:

[0038] Sensible heat exchanger;

[0039] The compressor has a first inlet (port a in the figure), a second inlet (port b in the figure), a third inlet (port c in the figure), and an outlet (port d in the figure) for the flow of refrigerant.

[0040] A gas-liquid separator is used for refrigerant gas-liquid separation and has an inlet (port g in the figure), a gas outlet (port e in the figure), and a liquid outlet (port f in the figure). The gas outlet is connected to the third inlet of the compressor.

[0041] The first heat exchanger has a refrigerant inlet connected to the compressor outlet and a refrigerant outlet connected to the gas-liquid separator inlet.

[0042] The first evaporator has a refrigerant inlet connected to the liquid outlet of the gas-liquid separator, and the refrigerant outlet of the first evaporator is connected to the first inlet of the compressor.

[0043] The second evaporator has a refrigerant inlet connected to the liquid outlet of the gas-liquid separator, and a refrigerant outlet connected to the second inlet of the compressor.

[0044] The method includes:

[0045] The first indoor return air is cooled and dehumidified by the second evaporator before being supplied to the room;

[0046] The first indoor return air is cooled and dehumidified by passing through the second evaporator and the first evaporator in sequence. Then, it is mixed with the outdoor fresh air that has been cooled and dehumidified by the sensible heat exchanger and then supplied to the room.

[0047] The return air in the second room is heated by the sensible heat exchanger and then exhausted to the outside, or the return air in the second room is heated by the sensible heat exchanger and the first heat exchanger in sequence and then exhausted to the outside.

[0048] The first indoor return air, the second indoor return air, and the indoor supply air form a circulation flow of air in the pool. The first indoor return air and the second indoor return air are only used to distinguish the direction of different return air, that is, to distinguish the next processing procedure of the return air. There is no substantial difference between the return air and the return air itself.

[0049] See Figure 1 As shown, the heat exchange equipment also includes a pool hot water heat exchanger, the refrigerant inlet of which is connected to the compressor outlet, and the refrigerant outlet of which is connected to the gas-liquid separator inlet.

[0050] See Figure 1 As shown, the heat exchange equipment also includes an outdoor condenser, the refrigerant inlet of which is connected to the outlet of the compressor, and the refrigerant outlet of which is connected to the inlet of the gas-liquid separator.

[0051] See the refrigerant circulation process in heat exchange equipment. Figure 3 As shown, Figure 3 In the diagram: Point 1 is the state point when the refrigerant from the first evaporator enters the compressor; Point 1' is the state point when the refrigerant from the second evaporator enters the compressor; Point 1" is the state point of the gaseous refrigerant separated by the gas-liquid separator; Points 1, 1', and 1" enter the compressor and are compressed, reaching state points 2, 2', and 2" respectively. The three are mixed and reach state point 3 at the compressor outlet. State point 3 passes through the pool hot water heat exchanger and the first heat exchanger to reach state point 4. Then, it passes through the first electronic expansion valve to become state point 5 and then enters the gas-liquid separator. Liquid refrigerant is separated in the gas-liquid separator and becomes state point 6. It then passes through the second and third electronic expansion valves to reach state points 7' and 7 respectively. Finally, it passes through the first and second evaporators to reach state points 1 and 1' respectively.

[0052] In summer, the introduction of fresh outdoor air not only helps to reduce the relative humidity of the swimming pool, but also reduces the content of toxic gases such as chlorine in the indoor swimming pool air.

[0053] See Figure 1 , Figure 2 As shown, after the first indoor return air enters the second evaporator, it has two paths for supplying air into the room. The first path is that the first indoor return air is cooled and dehumidified by the second evaporator and then directly supplied into the room by a high-temperature dehumidifying fan. The second path is that the first indoor return air is cooled and dehumidified by the second evaporator and the first evaporator in sequence, and then mixed with the outdoor fresh air that has been cooled and dehumidified by the sensible heat exchanger before being supplied into the room.

[0054] The first indoor return air is cooled and dehumidified through two stages of cooling and dehumidification via the first and second evaporators before being supplied to the room, achieving the effect of cooling and dehumidification. Because of the existence of the second and first evaporators with different evaporation temperatures, when the dehumidification and cooling loads are not high, only the second evaporator can be turned on. The second and first evaporators provide different evaporation temperatures for dehumidification, which, compared to a single heat cycle recovery system, increases the evaporation temperature and improves system efficiency.

[0055] After the return air from the second room enters the sensible heat exchanger, it has two paths to exhaust air to the outside. The first path is to exhaust air to the outside after the return air from the second room is heated by the sensible heat exchanger and the first heat exchanger in sequence.

[0056] This application utilizes the principle of heat pumps to absorb the heat obtained from dehumidification in the first and second evaporators, and pumps the heat to the condenser (the outdoor condenser, the pool hot water heat exchanger, and the first heat exchanger are all condensers) through a compressor. The pool hot water heat exchanger, acting as a condenser, can supply heat to the pool water for heating, thereby achieving heat recovery.

[0057] During summer operation, the pool hot water heat exchanger does not always require heat exchange. When the pool hot water heat exchanger is not in use, it can function as a condenser in the refrigeration cycle through the outdoor condenser and the first heat exchanger. The cooling gas in the first heat exchanger is the gas from the second indoor return air that has been heated by the sensible heat exchanger. This gas temperature is significantly lower than the outdoor circulating air in the outdoor condenser, and the heat exchange efficiency of the first heat exchanger is also significantly higher than that of the outdoor condenser. Therefore, the gas flow of this application improves the overall heat exchange efficiency of the condenser.

[0058] See the enthalpy-humidity diagram for the fresh air flow process. Figure 4a As shown, outdoor fresh air (enthalpy and humidity) Figure 4a The fresh air at point 1) is cooled to a constant humidity level after passing through the sensible heat exchanger. Figure 4a The fresh air at point 2, after mixing with return air at point 3 (the return air from the first room passing through the second evaporator and then the air after the first evaporator), changes its air state point to... Figure 4a Mixed air 1 in the middle, mixed air 1 is used as indoor air supply (enthalpy and humidity) Figure 4a 1) The mixed air is sent into the pool.

[0059] See the enthalpy-humidity diagram of the return air flow. Figure 4b As shown, the first indoor return air (enthalpy and humidity) Figure 4b The return air 1) is processed by the second evaporator to return air 2, and then processed by the first evaporator to return air 3. The return air 3 is mixed with the fresh air from the outside after it has been processed by the sensible heat exchanger, and then sent into the swimming pool as indoor air supply.

[0060] See the exhaust flow enthalpy-humidity diagram. Figure 4c As shown, the second room return air (enthalpy and humidity) Figure 4bThe exhaust air 1 is processed by a sensible heat exchanger to exhaust air 2, and exhaust air 2 is processed by a first heat exchanger to exhaust air 3. Exhaust air 3 has an enthalpy greater than or equal to that of outdoor air, which not only avoids the waste of exhaust air enthalpy but also improves the heat exchange effect of the condenser, thereby improving the system efficiency. Exhaust air 1 can also be directly processed by a sensible heat exchanger to achieve the same enthalpy as outdoor air before being discharged.

[0061] This application can employ the following two methods for heat and humidity control:

[0062] (1) The humidity decreases as the first indoor return air passes through the second evaporator to the indoor supply air. By controlling the air volume, the effect of heat and humidity control can be achieved.

[0063] (2) The return air in the first room is cooled and dehumidified by passing through the second evaporator and the first evaporator. The heat and humidity load borne by the first evaporator is adjusted by controlling the air volume passing through the first evaporator.

[0064] The two methods described above allow for flexible adjustment of the heat and humidity load ratio borne by the first and second evaporators. When the heat and humidity load is low, the return air from the first room can bypass the first evaporator and meet the heat and humidity requirements solely through the second evaporator. This increases the system's evaporation temperature and thus improves system efficiency. When the heat and humidity load is high, the heat and humidity load borne by the second evaporator can be increased by increasing the airflow from the first room return air through the second evaporator before returning to the room. This increases the system's evaporation temperature and improves overall system efficiency.

[0065] The reasons for the improved efficiency of the indoor swimming pool dehumidification and heat recovery method provided in this application during summer are as follows:

[0066] 1. The heat exchange equipment includes a first evaporator and a second evaporator. When the dehumidification and cooling loads are not high, only the second evaporator can be turned on, and the overall efficiency of the refrigeration system can be improved by increasing the evaporation temperature.

[0067] 2. The heat exchange equipment has a first evaporator and a second evaporator. The first and second evaporators have different temperatures, and the airflow within each evaporator can be controlled independently. The heat and moisture load ratio of the first and second evaporators can be adjusted by regulating the airflow within them. The higher the heat and moisture load ratio in the second evaporator, the greater the increase in system evaporation temperature and the higher the overall efficiency.

[0068] 3. The heat exchange equipment absorbs the heat obtained from dehumidification in the evaporator through the heat pump principle, and pumps the heat to the condenser (the outdoor condenser, the pool hot water heat exchanger, and the first heat exchanger are all condensers) through the compressor. The condenser (pool hot water heat exchanger) can then supply the heat to the pool water for heating, thereby realizing heat recovery.

[0069] 4. In summer, the pool hot water heat exchanger does not necessarily need to exchange heat continuously. When the pool hot water heat exchanger is not in use, the outdoor condenser and the first heat exchanger can function as the condenser in the refrigeration cycle. The cooling gas of the first heat exchanger is the gas from the second indoor return air that has been heated by the sensible heat exchanger. The temperature of this gas is significantly lower than that of the outdoor circulating air in the outdoor condenser. Therefore, the heat exchange efficiency of the first heat exchanger is also significantly higher than that of the outdoor condenser. Thus, the gas flow of this invention improves the overall heat exchange efficiency of the condenser.

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for dehumidification and heat recovery in indoor swimming pools during summer, characterized in that, The heat exchange equipment for implementing the method includes: Sensible heat exchanger; The compressor has a first inlet, a second inlet, a third inlet, and an outlet for refrigerant flow; A gas-liquid separator for refrigerant gas-liquid separation, having an inlet, a gas outlet, and a liquid outlet, wherein the gas outlet is connected to a third inlet of the compressor; The first heat exchanger has a refrigerant inlet connected to the compressor outlet and a refrigerant outlet connected to the gas-liquid separator inlet. The first evaporator has a refrigerant inlet connected to the liquid outlet of the gas-liquid separator, and the refrigerant outlet of the first evaporator is connected to the first inlet of the compressor. The second evaporator has its refrigerant inlet connected to the liquid outlet of the gas-liquid separator, and its refrigerant outlet connected to the second inlet of the compressor. The method includes: The first indoor return air is cooled and dehumidified by the second evaporator before being supplied to the room; The first indoor return air is cooled and dehumidified by passing through the second evaporator and the first evaporator in sequence. Then it is mixed with the outdoor fresh air that has been cooled and dehumidified by the sensible heat exchanger and then sent into the room. The return air in the second room is heated by the sensible heat exchanger and then exhausted to the outside, or the return air in the second room is heated by the sensible heat exchanger and the first heat exchanger in sequence and then exhausted to the outside.

2. The method for dehumidification and heat recovery in indoor swimming pools during summer as described in claim 1, characterized in that, The heat exchange equipment also includes a pool hot water heat exchanger, the refrigerant inlet of which is connected to the compressor outlet, and the refrigerant outlet of which is connected to the gas-liquid separator inlet.

3. The method for dehumidification and heat recovery in indoor swimming pools during summer as described in claim 1, characterized in that, The heat exchange equipment also includes an outdoor condenser, the refrigerant inlet of which is connected to the outlet of the compressor, and the refrigerant outlet of which is connected to the inlet of the gas-liquid separator.

4. The method for dehumidification and heat recovery in indoor swimming pools during summer as described in claim 1, characterized in that, Heat and humidity control can be performed using at least one of the following two methods: (1) Control the air volume of the return air in the first room; (2) Adjust the air volume of the first evaporator and the second evaporator.

5. The method for dehumidification and heat recovery in indoor swimming pools during summer as described in claim 1, characterized in that, The return air from the first room is cooled to 10-15°C by the second evaporator before entering the first evaporator.

6. The method for dehumidification and heat recovery in indoor swimming pools during summer as described in claim 1, characterized in that, The first indoor return air is cooled to 0-10°C by passing through the second evaporator and the first evaporator in sequence, and then mixed with the outdoor fresh air that has been cooled and dehumidified by the sensible heat exchanger.

7. The method for dehumidification and heat recovery in indoor swimming pools during summer as described in claim 1, characterized in that, Outdoor fresh air is cooled to 26-32°C after passing through a sensible heat exchanger.

8. The method for dehumidification and heat recovery in indoor swimming pools during summer as described in claim 1, characterized in that, The return air in the second room is heated to 28-32°C after passing through the sensible heat exchanger, and then enters the first heat exchanger.

9. The method for dehumidification and heat recovery in indoor swimming pools during summer as described in claim 1, characterized in that, The enthalpy of the outdoor exhaust air is greater than or equal to the enthalpy of the outdoor fresh air.

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