JP2013519066A - Heat source and cold source of air conditioning system with independent control of temperature and humidity - Google Patents

Abstract

  The present invention comprises a compressor (1), a first condenser (2) and a second condenser (3) connected in series, each connected to a second condenser (3). A first expansion valve (4) and a second expansion valve (5), and a first evaporator (6) and a second evaporator (7) each connected to the compressor (1). Further, a heat source and a cold heat source of the THIC air conditioning system are disclosed. The first evaporator (6) is connected to the first expansion valve (4) to form a first circulation tributary, and the second evaporator (7) is connected to the second expansion valve (5). The second circulation tributary and the first circulation tributary connected in parallel and the second circulation tributary connect the second condenser (3) and the compressor (1). . The heat and cold sources of the THIC air conditioning system of the present invention have a relatively high refrigeration efficiency, thereby significantly reducing energy consumption and protecting the atmospheric environment.

Description

  The present invention relates generally to the technical field of refrigeration and air conditioning equipment, and more particularly to heat and cold sources of an air conditioning system with independent control of temperature and humidity (THIC). .

  The THIC air conditioning system is intended for an air conditioning system consisting of an independent sensible heat treatment system for indoor temperature control and an independent latent heat treatment system for indoor humidity control. THIC air conditioning systems are increasingly used in recent years due to the advantages of improving the performance of air conditioning systems, reducing energy consumption, improving indoor air quality, and protecting the air environment. Patent Document 1 presents a high-efficiency fresh air processing unit using a liquid desiccant driven by a heat pump.

  This fresh air unit cools the desiccant concentrated solution by an evaporator (evaporator) of a heat pump to increase the moisture absorption capacity of the solution and remove latent heat released during the moisture absorption process. Moreover, this fresh air unit heats the regenerated diluted solution by the condenser of the same heat pump. This solution is concentrated and regenerated by performing a total heat exchange using exhaust from total heat recovery.

  The energy efficiency ratio (EER) of the heat pump driven liquid desiccant fresh air unit presented in Patent Document 1 is relatively high, and the practicality of this fresh air unit is very promising. In the THIC air conditioning system described below, the liquid desiccant fresh air unit refers to the heat pump-driven liquid desiccant fresh air unit presented in Patent Document 1.

  FIG. 1 is a schematic diagram showing the operating principle of a THIC air conditioning system in the prior art. Indoor sensible heat is removed by high temperature (about 18 ° C.) cold water from the refrigerator 1 and indoor latent heat is removed by dry cold fresh air from the liquid desiccant fresh air unit. In the liquid desiccant fresh air unit, the refrigerator 2 provides the cooling capacity required by the liquid dehumidifier and the heating capacity required by the liquid regenerator. The refrigerator 1 and the refrigerator 2 can be regarded as a heat source and a cold heat source of the THIC air conditioning system.

Regarding the heat source and cooling source of the THIC air conditioning system in the prior art, the refrigerator 1 is usually a turbo refrigerator or a screw refrigerator having a relatively large cooling capacity, and the refrigerator 2 usually has a relatively small cooling capacity. It is an eddy current refrigerator. A turbo refrigerator is not used as the refrigerator 2. Because the cooling capacity of a conventional turbo refrigerator is several thousand kilowatts, the cooling capacity required by the refrigerator 2 is usually less than 200 kW according to the normal fresh air requirements (less than 18000 m ³ / hour) Because.

  However, the refrigeration efficiency of the vortex refrigerator is usually lower than the refrigeration efficiency of the turbo chiller (the rated value of the vortex refrigerator is usually 3 to 4, whereas the rated value of the refrigeration efficiency of the turbo refrigerator is 5). ~ 6). If the turbo refrigerator can be made small enough to have the cooling capacity level of the vortex refrigerator, the vortex refrigerator can be replaced by a turbo refrigerator.

In summary, the refrigeration efficiency of the heat and cold sources of the prior art THIC air conditioning system is relatively low, which is disadvantageous for reducing energy consumption and protecting the atmospheric environment.

Chinese Patent Application Publication No. 1862123

  The technical problem to be solved by the present invention is to provide a heat source and a cold heat source of a THIC air conditioning system with an increased refrigeration efficiency in order to reduce energy consumption and protect the atmospheric environment, against the above drawbacks. There is to do.

  In order to solve the above technical problem, the present invention is a heat source and a cold heat source of a THIC air conditioning system, which is a compressor 1 and a first condenser 2 and a second condenser 3 connected in series. The first expansion valve 4 connected to the second condenser 3, the second expansion valve 5 connected to the second condenser 3, and the first expansion valve connected to the compressor 1. A heat source and a cold source provided with one evaporator 6 and a second evaporator 7 connected to the compressor 1 are provided. The first evaporator 6 is connected to the first expansion valve 4 to form a first circulation branch, and the second evaporator 7 is connected to the second expansion valve 5 to be connected to the second circulation valve. The first circulation tributary and the second circulation tributary that form a tributary and are connected in parallel connect the second condenser 3 and the compressor 1.

  The compressor 1 is preferably a centrifugal compressor. The first expansion valve 4 is preferably used to adjust the temperature of the outlet cold water of the first evaporator 6. The second expansion valve 5 is preferably used to adjust the temperature of the outlet diluted solution of the second evaporator 7.

  The present invention is further a heat and cold source of a THIC air conditioning system, comprising one or more refrigerators a and one or more refrigerators b, wherein the refrigerators a are connected to each other so as to form a ring. The first compressor 1a, the first condenser 2a, the first expansion valve 3a, and the first evaporator 4a are connected to each other so that the refrigerator b forms a ring. Thus, a heat source and a cold source including the second compressor 1b, the second condenser 2b, the second expansion valve 3b, and the second evaporator 4b are provided.

The first compressor 1a and the second compressor 1b are preferably centrifugal compressors.
Preferably, the one or more refrigerators a are controlled independently, and the one or more refrigerators b are controlled independently.

  The present invention provides a heat source and a cold source of a THIC air conditioning system in which one turbo chiller is used as a compressor for removing indoor sensible heat and indoor latent heat. The requirements for a heat source having a cooling capacity of less than 250 kW) and a cold heat source can be satisfied.

  The present invention further provides heat and cold sources for other THIC air conditioning systems in which at least two turbo chillers are used as compressors to independently remove indoor sensible heat and indoor latent heat, respectively. The requirements for heat and cold sources of large scale THIC air conditioning systems (total cooling capacity greater than 500 kW) can be met.

  Compared to conventional vortex chillers, turbo chillers have distinct advantages with respect to refrigeration efficiency, so the total refrigeration efficiency can be increased by using turbo chillers as heat and cold sources for THIC air conditioning systems. Therefore, it is possible to significantly reduce energy consumption and protect the atmospheric environment.

It is the schematic which shows the operation principle of the THIC air conditioning system in a prior art. 1 is a structural schematic diagram showing a heat source and a cold heat source of a THIC air conditioning system according to a first embodiment of the present invention. FIG. 5 is a structural schematic diagram showing a heat source and a cold heat source of a THIC air conditioning system according to a second embodiment of the present invention.

  Hereinafter, specific embodiments for carrying out the present invention will be described in detail with reference to the drawings and embodiments. The following embodiments are presented as explanations of the present invention and are not intended to limit the scope of the present invention.

<First Embodiment>
FIG. 2 is a structural schematic diagram showing a heat source and a cold heat source of the THIC air conditioning system according to the first embodiment of the present invention. As shown in FIG. 2, the heat source and the cold source of the THIC air conditioning system are the compressor 1, the first condenser 2 and the second condenser 3 connected in series, and the second condensation. A first expansion valve 4 connected to the compressor 3, a second expansion valve 5 connected to the second condenser 3, a first evaporator 6 connected to the compressor 1, and the compressor 1 And a second evaporator 7 connected to the.

  The first evaporator 6 is connected to the first expansion valve 4 to form a first circulation tributary, and the second evaporator 7 is connected to the second expansion valve 5 to form a second circulation tributary. doing. The first circulation tributary and the second circulation tributary connected in parallel connect the second condenser 3 and the compressor 1.

  First, a high-temperature (higher than 45 ° C.) outlet refrigerant from the compressor 1 flows into the first condenser 2, and a concentrated solution that flows through the other side of the first condenser 2 in the opposite direction to the outlet refrigerant. Heat. Next, the outlet refrigerant from the first condenser 2 flows into the second condenser 3, and excess condensation heat is removed by the cooling water flowing in the other direction of the second condenser 3 in the opposite direction to the outlet refrigerant. The

  The outlet refrigerant of the second condenser 3 is branched into two flows respectively adjusted by the first expansion valve 4 and the second expansion valve 5. One of these flows enters the first circulation branch, passes through the first expansion valve 4 and then flows into the first evaporator 6, whereby the first evaporator is in the direction opposite to the outlet refrigerant. The cold water of high temperature (18-21 degreeC) which flows through the other of 6 is cooled.

  The other flow enters the second circulation tributary, passes through the second expansion valve 5 and then flows into the second evaporator 7, thereby causing the second evaporator 7 to flow in the direction opposite to the outlet refrigerant. Cool the diluted solution flowing through the other. The outlet refrigerant of the first circulation tributary and the second circulation tributary (that is, the first evaporator 6 and the second evaporator 7) is mixed and returned to the compressor 1 as one refrigerant stream. The refrigerant then enters the next cycle after being processed.

  In this embodiment, the THIC air conditioning system heat source and cold source compressor 1 is a centrifugal compressor, eg, a centrifugal compressor having a cooling capacity of 175 kW (Wang Jia et al., “Micro “Performance analysis on micro centrifugal chillers”, China Hyundai Air Conditioning HV & AC, Air Conditioning and Sanitary Engineering Society, 2009, Vol. 39, No. 5, pp. 104-108).

  In this embodiment, the concentrated solution entering the first condenser 2 through the concentrated solution inlet 9 is heated to about 45 ° C. by the refrigerant and sent to the regenerator through the concentrated solution outlet 8. The cold water that has entered the first evaporator 6 through the cold water inlet 12 is cooled to about 18 ° C. by the refrigerant, and is sent to the indoor sensible heat section through the cold water outlet 13. The diluted solution that has entered the second evaporator 7 through the diluted solution inlet 14 is cooled to about 14 ° C. by the refrigerant, and is sent to the dehumidifier through the diluted solution outlet 15.

  In this embodiment, the temperature of the outlet cold water of the first evaporator 6 and the temperature of the outlet diluted solution of the second evaporator 7 are changed by the first expansion valve 4 and the second expansion valve 5, respectively. The cooling capacity of the first evaporator 6 and the second evaporator 7 is adjusted so as to satisfy the requirements as an evaporator.

  In this embodiment, the frequency of the compressor 1 or the angle of the guide vane (guide vane) adjusts the total refrigerant flow according to the degree of superheat of the outlet refrigerant of the first evaporator 6 and the second evaporator 7. Thus, the total cooling capacity of the refrigerator satisfies the requirement for removing sensible heat and latent heat.

  In this embodiment, the condensing temperature is adjusted by adjusting the temperature or flow of cooling water entering the second condenser 3 through the cooling water inlet 11 and the outlet concentrated solution temperature of the first condenser 2. However, it shall satisfy the requirements of the concentrated solution.

<Second Embodiment>
FIG. 3 is a schematic structural diagram of a heat source and a cold heat source of a THIC air conditioning system according to the second embodiment of the present invention. As shown in FIG. 3, the heat source and the cold heat source of the THIC air conditioning system include one or more refrigerators a and one or more refrigerators b, and the refrigerator a includes the first compressor 1a, the first 1 condenser 2a, 1st expansion valve 3a, and 1st evaporator 4a, these are connected mutually and form the ring. The refrigerator b includes a second compressor 1b, a second condenser 2b, a second expansion valve 3b, and a second evaporator 4b, which are connected to each other to form a ring. Yes.

  In the refrigerator a, first, the outlet refrigerant of the first compressor 1a flows into the first condenser 2a, and is refrigerated by the cooling water flowing in the other direction of the first condenser 2a in the opposite direction to the outlet refrigerant. The heat of condensation generated by machine a is removed. High-temperature cold water in which the outlet refrigerant from the first condenser 2a flows into the first evaporator 4a through the first expansion valve 3a and flows through the other side of the first evaporator 4a in the opposite direction to the outlet refrigerant. Is cooled. The outlet refrigerant of the first evaporator 4a flows into the first compressor 1a and enters the next cycle after being processed.

  In the refrigerator b, first, the outlet refrigerant of the second compressor 1b flows into the second condenser 2b, and the concentrated solution flowing in the other direction of the second condenser 2b in the opposite direction to the outlet refrigerant is used as the refrigerant. Heat at high temperature. The outlet refrigerant of the second condenser 2b flows into the second evaporator 4b through the second expansion valve 3b, and the diluted solution flowing through the other side of the second evaporator 4b in the direction opposite to the outlet refrigerant is To be cooled. The outlet refrigerant of the second evaporator 4b flows into the second compressor 1b and enters the next cycle after being processed.

  In this embodiment, the first compressor 1a and the second compressor 1b are, for example, centrifugal compressors having a cooling capacity of 175 kW (Wang Jia et al., “Micro Turbo Refrigerator”). (Performance analysis on micro centrifugal chiller) ”, China Hot Air Conditioning HV & AC, Air Conditioning and Sanitary Engineering Society, 2009, Vol. 39, No. 5, 104-108).

  In this embodiment, the high-temperature cold water that has entered the first evaporator 4 a through the cold water inlet 7 is cooled to about 18 ° C. by the refrigerant and is sent to the indoor sensible heat section through the cold water outlet 8. The concentrated solution entering the second condenser b through the concentrated solution inlet 10 is heated to about 45 ° C. by the refrigerant and sent to the regenerator through the concentrated solution outlet 9. The diluted solution that has entered the second evaporator 4 b through the diluted solution inlet 11 is cooled to about 14 ° C. by the refrigerant, and is sent to the dehumidifier through the diluted solution outlet 12.

  In this embodiment, one or more refrigerators a are controlled independently. One or more refrigerators b are controlled independently.

  In summary, the present invention provides a heat source and cold source for a THIC air conditioning system in which one turbo refrigerator is used as a compressor to remove both indoor sensible heat and indoor latent heat. The requirements for the heat source and the cold source of the THIC air conditioning system (total cooling capacity less than 250 kW) can be satisfied. The present invention further provides heat and cold sources for other THIC air conditioning systems in which at least two turbo chillers are used as compressors to independently remove indoor sensible heat and indoor latent heat, respectively. The requirements for heat and cold sources of large scale THIC air conditioning systems (total cooling capacity greater than 500 kW) can be met.

  Compared to conventional vortex chillers, turbo chillers have distinct advantages with respect to refrigeration efficiency, so the total refrigeration efficiency can be increased by using turbo chillers as heat and cold sources for THIC air conditioning systems. Therefore, it is possible to significantly reduce energy consumption and protect the atmospheric environment.

  The above embodiments are used only to explain the present invention, but do not limit the protection scope of the present invention. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Accordingly, all equivalent solutions are intended to be within the protection scope of the present invention as defined by the appended claims.

DESCRIPTION OF SYMBOLS 1 Compressor 1a 1st compressor 2 1st condenser 2a 1st condenser 2b 2nd condenser 3 2nd condenser 3a 1st expansion valve 3b 1st expansion valve 4 1st expansion Valve 4a First evaporator 4b Second evaporator 5 Second expansion valve 6 First evaporator 7 Second evaporator 9 Concentrate inlet 11 Cooling water inlet

Claims (7)

A heat source and a cold source of an air conditioning system capable of independently controlling temperature and humidity,
A compressor (1);
A first condenser (2) and a second condenser (3) connected in series;
A first expansion valve (4) connected to the second condenser (3);
A second expansion valve (5) connected to the second condenser (3);
A first evaporator (6) connected to the compressor (1);
A second evaporator (7) connected to the compressor (1),
The first evaporator (6) is connected to the first expansion valve (4) to form a first circulation tributary;
The second evaporator (7) is connected to the second expansion valve (5) to form a second circulation tributary;
A heat source and a cold heat source in which the first circulation branch and the second circulation branch connected in parallel connect the second condenser (3) and the compressor (1).   The heat source and cold source according to claim 1, wherein the compressor (1) is a centrifugal compressor.   The heat and cold source according to claim 1, wherein the first expansion valve (4) is used to adjust the temperature of the outlet cold water of the first evaporator (6).   The heat and cold source according to claim 1, wherein the second expansion valve (5) is used to adjust the temperature of the outlet diluted solution of the second evaporator (7). A heat source and a cold source of an air conditioning system capable of independently controlling temperature and humidity,
One or more refrigerators (a);
Comprising one or more refrigerators (b),
A first compressor (1a), a first condenser (2a), a first expansion valve (3a), a first compressor, and a refrigerator (a) connected to each other so as to form a ring. 1 evaporator (4a),
A second compressor (1b), a second condenser (2b), a second expansion valve (3b), and a second compressor (b) connected to each other so as to form a ring. Heat source and cold source including two evaporators (4b).   The heat source and cold source according to claim 5, wherein the first compressor (1a) and the second compressor (1b) are centrifugal compressors. The one or more refrigerators (a) are independently controlled;
The heat source and cold heat source according to claim 5, wherein the one or more refrigerators (b) are controlled independently of each other.

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