Centralized dual cold source cooling and heating system

Abstract

The application provides a centralized double cold source cooling and heating system, which comprises four structures. The first structure comprises a water chiller, a plate heat exchanger, a cooling system, a waste heat system, a chilled water pump, a cooling water pump, a hot water pump, a low-temperature chilled water pump, a high-temperature chilled water pump, an external cooling temperature and humidity control air conditioning unit, an external cooling temperature and humidity control fresh air unit, a fan coil and a regulating valve. The other three structures are slightly adjusted on the basis of the first structure. The application relates to a centralized double cold source cooling and heating system, which is combined with innovative external cooling temperature and humidity control air conditioning / fresh air units and fan coils to realize the functions of summer cooling, summer emergency cooling, dehumidification in the dog days, winter heating and direct winter heating of the centralized double cold source temperature and humidity control air conditioning system, and the functions of non-reheat cooling and heating of the process air conditioning.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cold and heat supply, and more particularly to a centralized dual-cold-source cold and heat supply system. BACKGROUND

[0002] The dual-cold-source temperature and humidity separate control air conditioning system is a new energy-saving air conditioning system, which has two temperature cold sources, wherein the low-temperature cold source undertakes indoor latent heat to meet the dehumidification demand, and the high-temperature cold source undertakes indoor sensible heat load and fresh air load to meet the cooling demand. The water temperature of the high-temperature cold source can be increased to significantly reduce the energy consumption of the cold source.

[0003] According to different settings of the low-temperature cold source of the dual-cold-source temperature and humidity separate control air conditioning system, the system can be divided into a centralized low-temperature cold source system and a decentralized low-temperature cold source system. The decentralized low-temperature cold source is usually provided by a temperature and humidity separate control air conditioning / fresh air unit, which can achieve deep dehumidification, and the dehumidification during the return of the south wind can also be achieved by using fresh air. Therefore, the system is mainly applied to occasions requiring deep dehumidification and dehumidification during the return of the south wind. The main disadvantages of the decentralized low-temperature cold source are as follows: the costs of the compressor, evaporator and condenser are high, the maintenance and management workload is large, the noise of the compressor has a certain influence on the building environment, and the heat dissipation louvers of the outdoor unit have a certain influence on the building facade.

[0004] The temperature and humidity separate control air conditioning / fresh air unit of the centralized low-temperature cold source does not have a compressor, which can avoid all the disadvantages of the decentralized low-temperature cold source system. However, the current centralized low-temperature cold source system does not have the dehumidification function during the return of the south wind, which limits the application of the centralized low-temperature cold source. SUMMARY

[0005] The present application provides a centralized dual-cold-source cold and heat supply system, which comprises a first form structure, the first form structure comprises a water chiller 1a-1e, a plate heat exchanger 2, a cooling system 3, a waste heat system 4, a chilled water pump first pump 5a-5e, a cooling water pump 6a-6e, a hot water pump 7, a low-temperature chilled water pump second pump 8, a high-temperature chilled water pump second pump 9, an external cooling type temperature and humidity separate control air conditioning unit 10, an external cooling type temperature and humidity separate control fresh air unit 11, a fan coil 12 and regulating valves V-1-V-16, wherein the coils in the external cooling type temperature and humidity separate control air conditioning unit 10, the external cooling type temperature and humidity separate control fresh air unit 11 and the fan coil 12 are defined as a first coil 13, a second coil 14 and a third coil 15 according to different functions.

[0006] All the devices and systems are connected through water pipes: wherein the chilled water pipeline is divided into a low-temperature chilled water pipeline and a high-temperature chilled water pipeline, the low-temperature chilled water pipeline is connected to the second coil 14, and the high-temperature chilled water pipeline is connected to the first coil 13 and the third coil 15; the cooling water pipeline is connected to heat dissipation devices such as cooling towers, the water chillers 1a-1e and the plate heat exchanger 2; and the waste heat utilization pipeline is connected to the waste heat system 4 and the dry pipes of the water chillers 1d and 1e.

[0007] Based on the technical scheme, the application can be further improved as follows.

[0008] Optionally, the number of the water chillers 1a-1e, the plate heat exchanger 2, the chilled water pumps 5a-5e, the cooling water pumps 6a-6e, the hot water pump 7, the low-temperature chilled water pump 8, the high-temperature chilled water pump 9, the outdoor-cooling temperature and humidity control air conditioning unit 10, the outdoor-cooling fresh air handling unit 11, and the fan-coil 12 is adjusted according to the load demand, the water chillers 1a-1e are operated under the low-temperature chilled water condition or the high-temperature chilled water condition, and the operation mode is switched flexibly according to the load demand.

[0009] Optionally, the low-temperature chilled water pump 8 and the high-temperature chilled water pump 9 are determined according to the water system form of the project.

[0010] Optionally, the waste heat system 4 includes multiple heat sources, and when the temperature of the heat source meets the use demand, the waste heat resource is directly used to supply the air conditioning terminal.

[0011] Optionally, the system further includes a second form structure, the second form structure adjusts the water chillers 1a-1e to the ground source heat pumps 1a-1e and adjusts the cooling system 3 to the ground source system 3 on the basis of the first form structure, and the plate heat exchanger 2, the hot water pump 7, and the adjusting valves V-7-V-14 are cancelled.

[0012] Optionally, the system further includes a third form structure, the third form structure adjusts the water chillers 1a-1e to the four-pipe evaporative cooling / air-cooled heat pumps 1a-1e and adjusts the cooling system 3 to the waste heat system 4 on the basis of the first form structure, and the plate heat exchanger 2, the hot water pump 7, the cooling system 3, and the adjusting valves V-5, V-6, V-11, V-12, V-15, and V-16 are cancelled.

[0013] Optionally, the system further includes a fourth form structure, the fourth form structure adjusts the water chillers 1a-1e to the four-pipe evaporative cooling / air-cooled heat pumps 1a-1e and increases the hot water pump 16 and the hot water pipeline on the basis of the first form structure; the low-temperature chilled water pipeline is connected to the first coil 13, the high-temperature chilled water pipeline is connected to the third coil 15, and the hot water pipeline is connected to the second coil 14; the plate heat exchanger 2, the hot water pump 7, the cooling system 3, the waste heat system 4, and the adjusting valves V-5-V-16 are cancelled.

[0014] Optionally, the system utilizes the regulating valve switching, the water chiller / ground source heat pump / four-tube evaporative cooling heat pump / four-tube air-cooled heat pump working condition switching, and the change of chilled water, cooling water and hot water temperature to realize the summer cooling, summer emergency cooling, summer dehumidification, winter heating, winter direct heating functions of the comfort air conditioner and the non-reheat cooling and heating functions of the process air conditioner.

[0015] The application provides a double cold source cooling and heating system, which has the following innovations.

[0016] The cold and heat source water system process is optimized, the condensation heat in the refrigeration process is used as a reheat heat source, and the summer dehumidification function is realized. The waste heat resource is recovered, and the low-temperature heating is realized by using the water chiller / heat pump unit. The summer emergency cooling function is increased, the water outlet temperature of the water chiller / heat pump unit 1c-1e can be adjusted according to the load size, and the system cooling capacity is improved. The cold and heat source system is simple, and the summer cooling, summer emergency cooling, summer dehumidification, winter heating and winter direct heating functions can be realized only by valve switching and the change of chilled water, cooling water and hot water temperature.

[0017] Meanwhile, the innovative various external cooling type temperature and humidity control air conditioners / primary air handling units and fan-coil units are used in the system, so that the double cold source temperature and humidity control air conditioning system with the centralized low-temperature cold source has the functions of summer cooling, summer emergency cooling, summer dehumidification, winter heating, winter direct heating, water chiller low-temperature heating and process air conditioner new air without reheat air treatment, and the overall performance is better than that of the double cold source temperature and humidity control air conditioning system with the dispersed low-temperature cold source. The construction cost is significantly reduced, the problems of noise and influence on the building facade of the internal cooling type greenhouse temperature and humidity control primary air handling unit are avoided, the double cold source temperature and humidity control air conditioning system with the centralized low-temperature cold source can replace the double cold source temperature and humidity control air conditioning system with the dispersed low-temperature cold source, and is an ideal temperature and humidity control air conditioning system. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a summer cooling working condition system principle diagram of the double cold source (water chiller);

[0019] Figure 2 It is a summer emergency cooling working condition system principle diagram of the double cold source (water chiller);

[0020] Figure 3 It is a summer dehumidification working condition system principle diagram of the double cold source (water chiller);

[0021] Figure 4 It is a winter heating working condition system principle diagram of the double cold source (water chiller);

[0022] Figure 5 It is a winter direct heating working condition system principle diagram of the double cold source (water chiller);

[0023] Figure 6System principle diagram for double cold source (ground source heat pump) summer cooling condition;

[0024] Figure 7 System principle diagram for double cold source (ground source heat pump) summer emergency cooling condition;

[0025] Figure 8 System principle diagram for double cold source (ground source heat pump) back south dehumidification condition;

[0026] Figure 9 System principle diagram for double cold source (ground source heat pump) winter heating condition;

[0027] Figure 10 System principle diagram for double cold source (ground source heat pump) winter direct heating condition;

[0028] Figure 11 System principle diagram for double cold source (four-tube evaporative cooling / air-cooled heat pump) summer cooling condition;

[0029] Figure 12 System principle diagram for double cold source (four-tube evaporative cooling / air-cooled heat pump) summer emergency cooling condition;

[0030] Figure 13 System principle diagram for double cold source (four-tube evaporative cooling / air-cooled heat pump) back south dehumidification condition;

[0031] Figure 14 System principle diagram for double cold source (four-tube evaporative cooling / air-cooled heat pump) winter heating condition;

[0032] Figure 15 System principle diagram for double cold source (four-tube evaporative cooling / air-cooled heat pump) winter direct heating condition;

[0033] Figure 16 System principle diagram for double cold source (four-tube evaporative cooling / air-cooled heat pump) six-tube summer cooling condition;

[0034] Figure 17 System principle diagram for double cold source (four-tube evaporative cooling / air-cooled heat pump) six-tube summer emergency cooling condition;

[0035] Figure 18 System principle diagram for double cold source (four-tube evaporative cooling / air-cooled heat pump) six-tube transition season cooling condition;

[0036] Figure 19 System principle diagram for double cold source (four-tube evaporative cooling / air-cooled heat pump) six-tube winter heating condition. DETAILED DESCRIPTION

[0037] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application. In addition, the technical features in each of the embodiments or in a single embodiment provided by the present application can be combined with each other at will to form a feasible technical solution, and such combination is not restricted by the order of steps and / or the mode of structural composition, but should be based on the fact that it can be realized by those of ordinary skill in the art. When the combination of technical solutions appears to be contradictory or cannot be realized, it should be considered that such combination of technical solutions does not exist and is not within the protection scope of the present application.

[0038] The structure of the centralized dual-cold-source cooling and heating system provided by the present application includes four forms, as shown in Figures 1-5 The dual-cold-source cooling and heating system of the first form structure includes: water chillers 1a-1e, a plate heat exchanger 2, a cooling system 3, a waste heat system 4, chilled water pumps 5a-5e, cooling water pumps 6a-6e, a hot water pump 7, a low-temperature chilled water pump 8 (if any), a high-temperature chilled water pump 9 (if any), an external cooling type temperature and humidity separate control air conditioning unit 10, an external cooling type temperature and humidity separate control fresh air unit 11, a fan coil 12 and regulating valves V-1-V-16. The internal coils of the external cooling type temperature and humidity separate control air conditioning unit 10, the external cooling type temperature and humidity separate control fresh air unit 11 and the fan coil 12 are defined as a first coil 13, a second coil 14 and a third coil 15 according to different functions. All these devices and systems are connected through water pipes: the chilled water pipeline is divided into a low-temperature chilled water pipeline and a high-temperature chilled water pipeline, the low-temperature chilled water pipeline is connected to the second coil 14, and the high-temperature chilled water pipeline is connected to the first coil 13 and the third coil 15; the cooling water pipeline is connected to heat dissipation devices such as cooling towers, the water chillers 1a-1e and the plate heat exchanger 2; the waste heat utilization pipeline is connected to the waste heat system 4 and the dry pipes of the water chillers 1d and 1e. The number of devices such as the water chillers 1a-1e, the plate heat exchanger 2, various water pumps, air conditioning / fresh air units and fan coils can be adjusted according to the load demand to adjust the operating state. All the water chillers can operate under the low-temperature chilled water working condition or the high-temperature chilled water working condition, and can be flexibly switched according to the load demand. The low-temperature chilled water pump 8 and the high-temperature chilled water pump 9 are secondary pumps, and whether to be used is determined according to the form of the water system of the project. The waste heat system 4 includes other various heat sources, and when the temperature of the heat source meets the use demand, the waste heat resource is directly used to supply the air conditioning terminal. The system uses valve switching and the temperature change of the chilled water and the cooling water to realize the functions of summer cooling, summer emergency cooling, dehumidification in the back-to-south season, winter heating and direct winter heating.

[0039] For the comfort air conditioning system, the operation conditions of the double cold source cooling and heating system of the first form structure are as follows:

[0040] 1. Cooling in summer: The water chiller 1a and 1b operate in low temperature condition, and provide low temperature chilled water (for example, 6 / 11℃) for the second coil 14 through the low temperature chilled water pipeline. The water chillers 1c~1e operate in high temperature condition, and provide high temperature chilled water (for example, 12 / 17℃) for the first coil 13 and the third coil 15 through the high temperature chilled water pipeline. The air conditioning / fresh air unit operates according to the innovative operation strategy, to realize the summer cooling function. The cooling water pipeline operates normally, and the plate heat exchanger 2 and the waste heat system 4 are closed.

[0041] 2. Emergency cooling in summer: The water chiller 1a and 1b operate in low temperature condition, and provide low temperature chilled water (for example, 6 / 11℃) for the second coil 14 through the low temperature chilled water pipeline. The water chillers 1c~1e switch to low temperature condition, and provide low temperature chilled water (for example, 7 / 12℃) for the first coil 13 and the third coil 15 through the high temperature chilled water pipeline. The air conditioning / fresh air unit operates according to the innovative operation strategy, to realize the emergency cooling function in summer. The cooling water pipeline operates normally, and the plate heat exchanger 2 and the waste heat system 4 are closed.

[0042] 3. Dehumidification in summer: The water chillers 1a~1e operate in low temperature condition, and provide low temperature chilled water (for example, 7 / 12℃) for the first coil 13 and the third coil 15 through the high temperature chilled water pipeline. The heat of the cooling water pipeline is exchanged by the plate heat exchanger 2, and then reheat hot water (for example, 35 / 30℃) is provided for the second coil 14 through the low temperature chilled water pipeline. The air conditioning / fresh air unit operates according to the innovative operation strategy, to realize the dehumidification function in summer. The cooling water pipeline operates normally, and the waste heat system 4 is closed.

[0043] 4. Heating in winter: The water chillers 1d~1e operate in low temperature or high temperature condition, absorb the heat in the waste heat system, and increase the temperature of the cooling water to a suitable temperature (for example, 45 / 40℃). The cooling water is exchanged by the plate heat exchanger 2, and then hot water is provided for the first coil 13 and the third coil 15 through the high temperature chilled water pipeline. The air conditioning / fresh air unit operates according to the innovative operation strategy, to realize the winter heating function. The terminal pipeline of the cooling system 3 is closed, the low temperature chilled water pipeline is closed, and the water chillers 1a~1c are closed.

[0044] 5. Direct heating in winter: When the waste heat resource meets the direct heating condition, only the waste heat utilization pipeline and the high temperature chilled water pipeline are opened for heating, and the water chillers 1, the plate heat exchanger 2, the cooling water system 3 and the low temperature chilled water pipeline are closed.

[0045] The control strategy of the first form structure system is summarized as follows:

[0046]

[0047] Referring to Figures 6-10 For the second form of the system structure, the second form of structure is based on the first form of structure, the water chiller 1a~1e is adjusted to the ground source heat pump 1a~1e, the cooling system 3 is adjusted to the ground source system 3; cancel the plate heat exchanger 2, the hot water pump 7, the regulating valve V7~V14.

[0048] For the comfort air conditioning system, the operating conditions of the double cold source cooling and heating system of the second form of structure are as follows:

[0049] 1. Summer cooling: The ground source heat pumps 1a and 1b operate in low-temperature conditions to provide low-temperature chilled water (e.g., 6 / 11°C) for the second coil 14 through the low-temperature chilled water pipeline. The ground source heat pumps 1c~1e operate in high-temperature conditions to provide high-temperature chilled water (e.g., 12 / 17°C) for the first coil 13 and the third coil 15 through the high-temperature chilled water pipeline. The air conditioning / fresh air unit operates according to the innovative operation strategy to realize the summer cooling function. The ground source water pipeline operates normally, and the waste heat system 4 is closed.

[0050] 2. Summer emergency cooling: The ground source heat pumps 1a and 1b operate in low-temperature conditions to provide low-temperature chilled water (e.g., 6 / 11°C) for the second coil 14 through the low-temperature chilled water pipeline. The ground source heat pumps 1c~1e switch to low-temperature conditions to provide low-temperature chilled water (e.g., 7 / 12°C) for the first coil 13 and the third coil 15 through the high-temperature chilled water pipeline. The air conditioning / fresh air unit operates according to the innovative operation strategy to realize the summer emergency cooling function. The ground source water pipeline operates normally, and the waste heat system 4 is closed.

[0051] 3. Dehumidification during the return of the south: The ground source heat pumps 1c~1e operate in low-temperature conditions to provide low-temperature chilled water (e.g., 7 / 12°C) for the first coil 13 and the third coil 15 through the high-temperature chilled water pipeline. The ground source heat pumps 1a~1b operate in heating conditions to provide reheated hot water (e.g., 35 / 30°C) for the second coil 14 through the low-temperature chilled water pipeline. The air conditioning / fresh air unit operates according to the innovative operation strategy to realize the dehumidification function during the return of the south. The ground source water pipeline operates normally, and the waste heat system 4 is closed.

[0052] 4. Winter heating: The ground source heat pumps 1d~1e operate in low-temperature or high-temperature conditions to absorb heat from the waste heat system and improve the temperature of the ground source system. The ground source heat pumps 1a~1c operate in heating conditions to provide hot water (e.g., 45 / 40°C) for the first coil 13 and the third coil 15 through the high-temperature chilled water pipeline, and the air conditioning / fresh air unit operates according to the innovative operation strategy to realize the winter heating function. The low-temperature chilled water pipeline is closed.

[0053] 5. Direct heating in winter: When the waste heat resource meets the direct heating condition, only open the waste heat utilization pipeline and the high-temperature chilled water pipeline to heat, and close the ground source heat pump 1, the ground source system 3 and the low-temperature chilled water pipeline.

[0054] The control strategy of the second form structure system is as follows:

[0055]

[0056] Referring to Figures 11-15 , the system further comprises a third form structure, which adjusts the water chiller 1a~1e to a four-pipe evaporative air-cooled heat pump 1a~1e and adjusts the cooling system 3 to a waste heat system 4 on the basis of the first form structure; cancels the plate heat exchanger 2, the hot water pump 7, the cooling system 3, the regulating valves V-5, V-6, V-11, V-12, V-15 and V-16.

[0057] For the comfort air conditioning system, the system operating conditions of the third form structure are as follows:

[0058] 1. Cooling in summer: The four-pipe evaporative air-cooled heat pump 1a, 1b operates in low-temperature condition, and provides low-temperature chilled water (for example, 6 / 11℃) for the second coil 14 through the low-temperature chilled water pipeline. The four-pipe evaporative air-cooled heat pump 1c~1e operates in high-temperature condition, and provides high-temperature chilled water (for example, 12 / 17℃) for the first coil 13 and the third coil 15 through the high-temperature chilled water pipeline. The air conditioning / fresh air unit operates according to the innovative operation strategy, realizing the summer cooling function. The cooling water pipeline and the waste heat system 4 are closed.

[0059] 2. Emergency cooling in summer: The four-pipe evaporative air-cooled heat pump 1a, 1b operates in low-temperature condition, and provides low-temperature chilled water (for example, 6 / 11℃) for the second coil 14 through the low-temperature chilled water pipeline. The four-pipe evaporative air-cooled heat pump 1c~1e switches to low-temperature condition, and provides low-temperature chilled water (for example, 7 / 12℃) for the first coil 13 and the third coil 15 through the high-temperature chilled water pipeline. The air conditioning / fresh air unit operates according to the innovative operation strategy, realizing the emergency cooling function in summer. The cooling water pipeline and the waste heat system 4 are closed.

[0060] 3. Dehumidification in the back south: The four-pipe evaporative air-cooled heat pump 1a~1e operates in low-temperature condition, and provides low-temperature chilled water (for example, 7 / 12℃) for the first coil 13 and the third coil 15 through the high-temperature chilled water pipeline. The heat of the cooling water pipeline provides reheat hot water (for example, 35 / 30℃) for the second coil 14 through the low-temperature chilled water pipeline. The air conditioning / fresh air unit operates according to the innovative operation strategy, realizing the dehumidification function in the back south. The cooling water pipeline operates normally, and the waste heat system 4 is closed.

[0061] 4. Winter heating: Four-tube evaporative air-cooled heat pump 1d~1e operates in heating mode to absorb heat from the waste heat system, improving the heating efficiency of four-tube evaporative air-cooled heat pump 1. Air conditioning / fresh air unit operates in innovative operation strategy to realize winter heating function. Cooling water pipeline and waste heat system 4 operate normally.

[0062] 5. Winter direct heating: When the waste heat resource meets the direct heating condition, only open the waste heat system 4 and the high-temperature chilled water pipeline for heating, and close the four-tube evaporative air-cooled heat pump 1, the cooling water pipeline and the low-temperature chilled water pipeline.

[0063] The control strategy of the third form of structure of the double cold source cooling and heating system is as follows:

[0064]

[0065] Referring to Figures 16-19 , the system further includes a fourth form of structure, which adjusts the water chiller 1a~1e to four-tube evaporative air-cooled heat pump 1a~1e on the basis of the first form of structure, increases the hot water pump 16 and the hot water pipeline; the low-temperature chilled water pipeline is connected to the first coil 13, the high-temperature chilled water pipeline is connected to the third coil 15, and the hot water pipeline is connected to the coil 14; the plate heat exchanger 2, the hot water pump 7, the cooling system 3, the waste heat system 4, and the regulating valve V5~V16 are cancelled.

[0066] For process air conditioning system, the operating conditions of the fourth form of structure of the double cold source cooling and heating system are as follows:

[0067] 1. Summer cooling: Four-tube evaporative air-cooled heat pump 1a~1c operates in low-temperature mode to provide low-temperature chilled water (e.g. 6 / 11℃) for the first coil 13 through the low-temperature chilled water pipeline. Four-tube evaporative air-cooled heat pump 1d, 1e operates in high-temperature mode to provide high-temperature chilled water (e.g. 12 / 17℃) for the coil 15 through the high-temperature chilled water pipeline. The air conditioning / fresh air unit operates in innovative operation strategy, and the air conditioning unit operates in secondary return air mode without reheating, realizing summer no-reheating cooling function. The cooling water pipeline is closed.

[0068] 2. Summer emergency cooling: Four-tube evaporative air-cooled heat pump 1a~1c operates in low-temperature mode to provide low-temperature chilled water (e.g. 6 / 11℃) for the first coil 13 through the low-temperature chilled water pipeline. Four-tube evaporative air-cooled heat pump 1d, 1e operates in low-temperature mode to provide low-temperature chilled water (e.g. 7 / 12℃) for the third coil 15 through the high-temperature chilled water pipeline. The air conditioning / fresh air unit operates in innovative operation strategy, and the air conditioning unit operates in secondary return air mode without reheating, and the third coil 15 also provides cooling, reducing the return air supply air temperature, realizing summer emergency cooling function. The cooling water pipeline is closed.

[0069] 3. Transition season cooling: Four-pipe evaporative air-cooled heat pumps 1a~1c operate in low-temperature conditions to provide low-temperature chilled water (e.g. 6 / 11℃) to the first coil 13 through the low-temperature chilled water pipeline. Four-pipe evaporative air-cooled heat pumps 1d, 1e operate in high-temperature conditions to provide high-temperature chilled water (e.g. 12 / 17℃) to the third coil 15 through the high-temperature chilled water pipeline. The heat recovered from the operation of the four-pipe evaporative air-cooled heat pumps in cooling conditions is provided to the second coil 14 through the hot water pipeline (e.g. 35 / 30℃). The air conditioning / fresh air handling unit operates according to the innovative operation strategy, and the fresh air is reheated by the recovered free hot water to achieve the appropriate supply air temperature. The hot water pipeline is open.

[0070] 4. Winter heating: Four-pipe evaporative air-cooled heat pumps 1a~1e operate in heating conditions to provide low-temperature hot water (e.g. 45 / 40℃) to the first coil 13 through the low-temperature chilled water pipeline and hot water (e.g. 45 / 40℃) to the third coil 15 through the high-temperature chilled water pipeline. The air conditioning / fresh air handling unit operates according to the innovative operation strategy to achieve the winter heating function. The cooling water pipeline is closed.

[0071] The control strategy of the fourth form of dual cold source cooling and heating system for process air conditioning systems or comfort air conditioning systems is as follows:

[0072]

[0073] The present application provides a centralized dual cold source cooling and heating system, which adopts innovative various external cooling type temperature and humidity control air conditioning / fresh air handling units and fan-coil units, so that the centralized low-temperature cold source dual cold source temperature and humidity control air conditioning system has the functions of summer cooling, summer emergency cooling, dehumidification in the hot and humid weather, winter heating, winter direct heating, low-temperature heating of a water chiller, and fresh air air treatment without reheating of a process air conditioning, and the overall performance is better than that of a decentralized low-temperature cold source dual cold source temperature and humidity control air conditioning system. The construction cost is significantly reduced, the problems of noise and influence on the building facade of an internal cooling type greenhouse temperature and humidity control fresh air handling unit are avoided, and the centralized dual cold source temperature and humidity control air conditioning system can replace the decentralized low-temperature cold source dual cold source temperature and humidity control air conditioning system, and is an ideal temperature and humidity control air conditioning system.

[0074] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0075] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including all the preferred embodiments and all the changes and modifications falling within the scope of the present application.

[0076] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A centralized dual cold source cooling and heating system, characterized in that, The system comprises a first form structure, the first form structure comprises water chillers 1a-1e, a plate heat exchanger (2), a cooling system (3), a waste heat system (4), chilled water pumps 5a-5e, cooling water pumps 6a-6e, a hot water pump (7), a low-temperature chilled water pump (8), a high-temperature chilled water pump (9), an external cooling type temperature and humidity control air conditioning unit (10), an external cooling type temperature and humidity control fresh air unit (11), a fan coil (12), and regulating valves V-1-V-16, wherein the coils inside the external cooling type temperature and humidity control air conditioning unit (10), the external cooling type temperature and humidity control fresh air unit (11), and the fan coil (12) are defined as first coils (13), second coils (14), and third coils (15) according to different functions; all the devices and systems are connected through water pipes, wherein the chilled water pipes are divided into low-temperature chilled water pipes and high-temperature chilled water pipes, the low-temperature chilled water pipes are connected to the second coils (14), and the high-temperature chilled water pipes are connected to the first coils (13) and the third coils (15); the cooling water pipes are connected to cooling tower heat dissipation devices, the water chillers 1a-1e, and the plate heat exchanger (2); and the waste heat utilization pipes are connected to the waste heat system (4) and the dry pipes of the water chillers 1d-1e; the system of the first form structure utilizes condensation heat in a refrigeration process as a reheat heat source to realize a back-to-south dehumidification function. The system further comprises a second form structure, the second form structure is based on the first form structure, the water chillers 1a-1e are adjusted to be ground source heat pumps 1a-1e, the cooling system (3) is adjusted to be a ground source system, and the plate heat exchanger (2), the hot water pump (7), and the regulating valves V-7-V-14 are cancelled. The system further comprises a third form structure, the third form structure is based on the first form structure, the water chillers 1a-1e are adjusted to be four-tube evaporative cold heat pumps 1a-1e or four-tube air-cooled heat pumps 1a-1e, the cooling system (3) is adjusted to be the waste heat system (4), and the plate heat exchanger (2), the hot water pump (7), the cooling system (3), the regulating valves V-5, V-6, V-11, V-12, V-15, and V-16 are cancelled; the system of the third form structure utilizes condensation heat in a refrigeration process as a reheat heat source to realize a back-to-south dehumidification function. The system utilizes regulating valve switching, water chiller / ground source heat pump / four-tube evaporative cold heat pump / four-tube air-cooled heat pump working condition switching, and changes in chilled water, cooling water, and hot water temperatures to realize summer cooling, summer emergency cooling, back-to-south dehumidification, winter heating, and winter direct heating functions of a comfort air conditioner.

2. The centralized dual cold source heating and cooling system of claim 1, wherein, The number of the water chillers 1a-1e, the plate heat exchanger (2), the chilled water pumps 5a-5e, the cooling water pumps 6a-6e, the hot water pump (7), the low-temperature chilled water pump (8), the high-temperature chilled water pump (9), the outdoor-cooling temperature and humidity control air conditioning unit (10), the outdoor-cooling fresh air handling unit (11), and the fan-coil (12) is adjusted according to the load demand, and the water chillers 1a-1e are operated in the low-temperature chilled water mode or in the high-temperature chilled water mode and are switched flexibly according to the load demand.

3. The centralized dual cold source heating and cooling system of claim 2, wherein, The low-temperature chilled water pump (8) and the high-temperature chilled water pump (9) are determined according to the water system form of the project.

4. The centralized dual cold source heating and cooling system of claim 1, wherein, The waste heat system (4) includes multiple heat sources, and when the temperature of the heat source meets the use demand, the waste heat resource is directly used to supply the air conditioning terminal.

5. The centralized dual cold source heating and cooling system of claim 1, wherein, The system further includes a fourth form structure, which is based on the first form structure, adjusts the water chillers 1a-1e to be four-tube evaporative cool heat pumps 1a-1e or four-tube air-cooled heat pumps 1a-1e, increases the hot water pump (16) and the hot water pipeline, connects the first coil (13) to the low-temperature chilled water pipeline, connects the third coil (15) to the high-temperature chilled water pipeline, and connects the second coil (14) to the hot water pipeline, and cancels the plate heat exchanger (2), the hot water pump (7), the cooling system (3), the waste heat system (4), and the regulating valves V-5-V-16 of the first form structure.

6. The centralized dual cold source heating and cooling system of claim 5, wherein, The system realizes the non-reheating cooling and heating function of the process air conditioner by using the regulating valve switching, the four-tube evaporative cool heat pump / four-tube air-cooled heat pump mode switching, and the change of the chilled water and hot water temperature.

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