CN118463425B - A zoned two-pipe evaporative heat pump cooling and heating system - Google Patents

A zoned two-pipe evaporative heat pump cooling and heating system Download PDF

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Publication number
CN118463425B
CN118463425B CN202410451723.7A CN202410451723A CN118463425B CN 118463425 B CN118463425 B CN 118463425B CN 202410451723 A CN202410451723 A CN 202410451723A CN 118463425 B CN118463425 B CN 118463425B
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China
Prior art keywords
water
pipe
heat exchanger
valve
heat
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CN118463425A (en
Inventor
雷建平
张再鹏
陈焰华
潘际淼
胡晓伟
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Citic Corp Of China
CITIC General Institute of Architectural Design and Research Co Ltd
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Citic Corp Of China
CITIC General Institute of Architectural Design and Research Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

本发明涉及一种分区两管制蒸发冷热泵供冷供热系统，包括热回收型蒸发冷热泵A、外区干管组、内区干管组；所述热回收型蒸发冷热泵A的冷冻水出水、回水管均与内区干管组、外区干管组管道连通，用以向内、外区供冷供热；所述热回收型蒸发冷热泵A的热水出水、回水管均与内区干管组、外区干管组管道连通，用以向内、外区供冷供热；其有益效果是：其水温可根据不同类型建筑的用能需求进行变化，并根据不同空气处理过程进行分区，同一处理过程归为一个分区。

The present invention relates to a zoned two-pipe evaporative cooling and heat pump cooling and heating system, comprising a heat recovery type evaporative cooling and heat pump A, an outer zone dry pipe group, and an inner zone dry pipe group; the chilled water outlet and return pipes of the heat recovery type evaporative cooling and heat pump A are connected to the inner zone dry pipe group and the outer zone dry pipe group pipes to provide cooling and heating to the inner and outer zones; the hot water outlet and return pipes of the heat recovery type evaporative cooling and heat pump A are connected to the inner zone dry pipe group and the outer zone dry pipe group pipes to provide cooling and heating to the inner and outer zones; the beneficial effect is that the water temperature can be changed according to the energy demand of different types of buildings, and the zones can be divided according to different air treatment processes, and the same treatment process is classified into one zone.

Description

Cold and heat supply system of partition two-pipe evaporation cold and heat pump
Technical Field
The invention relates to the technical field of cold and heat pump systems, in particular to a cold and heat supply system of a zoned two-pipe evaporation cold and heat pump.
Background
The evaporating cold heat pump is a novel energy-saving air conditioning system. The principle of evaporative cooling is that water is sprayed onto the surface of a condenser to form a water film, the water film is in direct contact with air to perform heat-moisture exchange, and part of the water absorbs the latent heat of vaporization and then evaporates into water vapor which is discharged by a fan, so that the discharge of condensation heat is promoted. The heat exchange efficiency of the evaporative cold heat pump is obviously higher than that of an air-cooled heat pump and a water cooling unit, a cooling water system is simplified, and the energy is saved by more than 15% compared with that of a traditional water chilling unit and more than 30% compared with that of the air-cooled heat pump.
But the evaporating cold heat pump can only realize simple cold supply and heat supply functions at present, the functions are relatively single, energy saving potential is not fully exploited yet, and how to design a structure to adapt to various scenes so as to reduce cost is a technical problem to be solved urgently at present.
Disclosure of Invention
Aiming at the technical problems existing in the prior art, the invention provides a partitioned two-pipe evaporative cooling and heating pump cooling and heating system, which can realize free heat supply while cooling, free cooling while heating and free cooling by evaporative cooling, and simultaneously realize the application of a dual-cold-source temperature and humidity control technology and the dehumidification function in the south China.
The technical scheme for solving the technical problems is that the first aspect protects a cold and heat supply system of a zoned two-pipe evaporation cold and heat pump, which comprises a heat recovery type evaporation cold and heat pump A, an outer zone dry pipe group and an inner zone dry pipe group;
The chilled water outlet pipe and the return pipe of the heat recovery type evaporative cold heat pump A are communicated with the inner area dry pipe group and the outer area dry pipe group through pipes and used for supplying cold and heat to the inner area and the outer area;
The hot water outlet pipe and the water return pipe of the heat recovery type evaporative cold heat pump A are communicated with the inner area dry pipe group and the outer area dry pipe group through pipelines and used for supplying cold and heat to the inner area and the outer area;
The heat recovery type evaporative cooling heat pump A comprises an evaporative cooling heat exchanger, a plate heat exchanger and a first water pump, wherein the evaporative cooling heat exchanger is communicated with water inlet and outlet ends of the primary side of the plate heat exchanger, and the water inlet and outlet ends of the secondary side of the plate heat exchanger are connected with an outer area dry pipe group and an inner area dry pipe group through pipes;
The water outlet of the first water pump is communicated with a water inlet pipeline at the primary side of the plate heat exchanger, and is used for conveying cooling water to the plate heat exchanger and then exchanging heat or refluxing to the evaporative cooling heat exchanger.
According to a further technical scheme, the heat recovery type evaporative cold heat pump A further comprises an air cooling heat exchanger, a water cooling heat exchanger, a compressor and a reversing valve which are connected through pipelines;
The inlet end of the air-cooled heat exchanger is connected with a refrigerant pipe pipeline of the evaporative cooling heat exchanger, and the outlet end of the air-cooled heat exchanger is divided into two paths which are respectively connected with a first port of the reversing valve and the compressor pipe;
the outlet end and the water inlet end of the secondary side of the water-cooling heat exchanger are connected with the outer area dry pipe group and the inner area dry pipe group through pipes;
The compressor is communicated with a third port pipeline of the reversing valve;
and a fourth port of the reversing valve is connected with a refrigerant pipe of the evaporative cooling heat exchanger.
Further technical proposal, the outer dry pipe group comprises an outer water dry pipe and an outer backwater dry pipe;
the inner area main pipe group comprises an inner area water main pipe and an inner area backwater main pipe;
Wherein, the chilled water outlet pipe of the heat recovery type evaporative cold heat pump A is divided into two paths, one path is connected with the outer area water main pipe and is provided with a first valve thereon, and the other path is connected with the inner area water main pipe and is provided with a second valve thereon;
The chilled water return pipe of the heat recovery type evaporation cold heat pump A is divided into two paths, one path is connected with the outer area return water main pipe and is provided with a third valve, and the other path is connected with the inner area return water main pipe and is provided with a fourth valve;
the hot water outlet pipe of the heat recovery type evaporation cold heat pump A is divided into two paths, one path is connected with the outer region water main pipe and is provided with a fifth valve, and the other path is connected with the inner region water main pipe and is provided with a sixth valve;
the hot water return pipe of the heat recovery type evaporation cold heat pump A is divided into two paths, one path is connected with the outer area return water main pipe and is provided with a seventh valve, and the other path is connected with the inner area return water main pipe and is provided with an eighth valve.
Further, the technical scheme also comprises a fresh air unit B and an air conditioner unit C;
an outer area coil pipe and an inner area coil pipe are arranged in the fresh air unit B and the air conditioning unit C;
the two ends of the outer area coil pipe are respectively communicated with the outer area water main pipe and the outer area backwater main pipe, and the two ends of the inner area coil pipe are respectively communicated with the inner area water main pipe and the inner area backwater main pipe.
Further, the technical scheme further comprises two fan coils D, wherein an outer region coil is arranged in one fan coil D to serve an outer region, and an inner region coil is arranged in the other fan coil to serve an inner region;
the two ends of the outer area coil pipe are respectively communicated with the outer area water main pipe and the outer area backwater main pipe, and the two ends of the inner area coil pipe are respectively communicated with the inner area water main pipe and the inner area backwater main pipe.
According to a further technical scheme, the evaporative cooling heat exchanger further comprises a spray pipe, a fan and a water receiving disc which are positioned in the shell of the evaporative cooling heat exchanger;
The spray pipe is positioned above the refrigerant pipe to spray cooling water to the refrigerant pipe to form a water film, the water receiving disc is positioned below the water film, and the first water pump is used for conveying the cooling water in the water receiving disc to the plate heat exchanger so as to exchange heat with water from the second water pump on the demand side in the plate heat exchanger;
the fan is used for discharging the evaporated water vapor out of the shell;
The spray pipe is provided with a tenth valve, two branches extending out of the evaporative cooling heat exchanger are arranged on a pipeline where the tenth valve is located, and the two branches are respectively communicated with an inlet and an outlet of the primary side of the plate heat exchanger.
Still further technical scheme, still be equipped with first air intake on the casing of evaporative cooling heat exchanger, and this first air intake is relative with the water film for blow the air to the water film and carry out the heat exchange.
The second aspect protects a cooling and heating method of a cooling and heating system with two-pipe evaporation and heat pump in partition, which is applied to the cooling and heating system with two-pipe evaporation and heat pump in partition in the first aspect, and comprises the following steps:
Step one, partitioning according to the air treatment process, wherein the same treatment process is classified into the same partition;
Secondly, formulating water temperatures required in corresponding subareas according to energy requirements of different seasons and different buildings, and then performing variable water temperature operation;
The variable water temperature operation is realized by adjusting the operation condition of the heat recovery type evaporative cold heat pump A and matching with the switching of valves on the outer zone dry pipe group and the inner zone dry pipe group.
As a further technical scheme, in the first step, the air treatment process comprises three treatment processes of cooling, heating, cooling firstly and heating secondly;
When the air conditioner is divided into an outer area and an inner area, and a fresh air unit B, an air conditioner unit C and a fan coil D are connected according to scene requirements to perform cooling and heating.
As a further technical scheme, the valves on the outer zone dry pipe group and the inner zone dry pipe group are the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve and the eighth valve.
The beneficial effects of the invention are as follows:
1. the invention divides the air treatment process into different areas, the same treatment process is classified into the same area, and the water temperature changing operation is carried out according to the energy consumption requirements of different types of buildings and different seasons;
2. The system can realize the free heat supply and free cooling capacity and free evaporative cooling function while supplying cold, simultaneously realize the application of the double-cold-source temperature and humidity control technology and the dehumidification function in the south of China, and fully exert the energy-saving potential and various functions of the evaporative cooling technology.
Drawings
FIG. 1 is a flow chart of a system of the present invention;
FIG. 2 is a flow chart of the system according to embodiment 2 of the present invention;
FIG. 3 is a flow chart of the system of embodiment 3 of the present invention;
FIG. 4 is a flow chart of the system of embodiment 4 of the present invention;
FIG. 5 is a flow chart of the system of embodiment 5 of the present invention;
FIG. 6 is a flow chart of the system of embodiment 6 of the present invention;
In the drawings, the list of components represented by the various numbers is as follows:
The outer region water main 1, the outer region water main 2, the inner region water main 3, the inner region water main 4, the first valve 5, the second valve 6, the third valve 7, the fourth valve 8, the fifth valve 9, the sixth valve 10, the seventh valve 11, the eighth valve 12, the evaporative cooling heat exchanger 13, the plate heat exchanger 14, the first water pump 15, the spray pipe 16, the fan 17, the water receiving disc 18, the refrigerant pipe 19, the second water pump 20, the tenth valve 21, the eleventh valve 22, the twelfth valve 23, the first air inlet 24, the second air inlet 25, the air cooling heat exchanger 26, the water cooling heat exchanger 27, the compressor 28, the reversing valve 29, the ninth valve 30, the expansion valve 31, the outer region coil 32, the inner region coil 33, and the cold and hot water pump 34.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, the term "for example" is used to mean "serving as an example, instance, or illustration. Any embodiment described as "for example" in this disclosure is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes have not been described in detail so as not to obscure the description of the application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
Example 1
In order to meet the energy consumption requirements of different types of buildings, cold and hot water with proper temperature is provided according to the requirements, heat is provided for free while heat is supplied for cooling, cold is provided for free while heat is supplied for heating, and the system has the functions of evaporating cold and free cooling and the like.
The chilled water outlet pipe and the return pipe of the heat recovery type evaporative cold heat pump A are communicated with the inner area dry pipe group and the outer area dry pipe group through pipes and used for supplying cold and heat to the inner area and the outer area;
The hot water outlet pipe and the water return pipe of the heat recovery type evaporative cold heat pump A are communicated with the inner area dry pipe group and the outer area dry pipe group through pipelines and used for supplying cold and heat to the inner area and the outer area;
in more detail, the outer-zone dry pipe group comprises an outer-zone water dry pipe 1 and an outer-zone backwater dry pipe 2;
The inner-zone main pipe group comprises an inner-zone water main pipe 3 and an inner-zone backwater main pipe 4;
wherein, the chilled water outlet pipe of the heat recovery type evaporative cold heat pump A is divided into two paths, one path is connected with the outer region water main pipe 1 and provided with a first valve 5 thereon, the other path is connected with the inner region water main pipe 3 and provided with a second valve 6 thereon, and the water quantity is controlled by the first valve 5 and the second valve 6;
The chilled water return pipe of the heat recovery type evaporation cold heat pump A is divided into two paths, one path is connected with the outer area return water main pipe 2 and is provided with a third valve 7, the other path is connected with the inner area return water main pipe 4 and is provided with a fourth valve 8, and the water quantity is controlled through the third valve 7 and the fourth valve 8;
The hot water outlet pipe of the heat recovery type evaporation cold heat pump A is divided into two paths, one path is connected with the outer region water main pipe 1 and is provided with a fifth valve 9, the other path is connected with the inner region water main pipe 3 and is provided with a sixth valve 10, and the water quantity is controlled through the fifth valve 9 and the sixth valve 10;
the hot water return pipe of the heat recovery type evaporation cold heat pump A is divided into two paths, one path is connected with the outer region return water main pipe 2 and is provided with a seventh valve 11, the other path is connected with the inner region return water main pipe 4 and is provided with an eighth valve 12, and the water quantity is controlled through the seventh valve 11 and the eighth valve 12;
In a specific implementation process, a plurality of heat recovery type evaporative cooling and heating pumps A can be arranged, and the specific use quantity is determined according to actual scene requirements.
The heat recovery type evaporative cooling heat pump A comprises an evaporative cooling heat exchanger 13, a plate heat exchanger 14 and a first water pump 15, wherein the evaporative cooling heat exchanger 13 is communicated with water inlet and outlet end pipelines of the primary side of the plate heat exchanger 14, and water inlet and outlet ends of the secondary side of the plate heat exchanger 14 are connected with an outer area dry pipe group and an inner area dry pipe group through pipelines to provide water after heat exchange;
The water outlet of the first water pump 15 is communicated with a water inlet pipeline at the primary side of the plate heat exchanger 14, so as to convey cooling water to the plate heat exchanger 14 and then exchange heat or reflux the cooling water to the evaporative cooling heat exchanger 13.
In a specific implementation process, the evaporative cooling heat exchanger 13 further comprises a spray pipe 16, a fan 17 and a water receiving disc 18 which are positioned in the shell of the evaporative cooling heat exchanger.
The spray pipe 16 is located above the refrigerant pipe 19 to spray cooling water to the refrigerant pipe 19 to form a water film, the water receiving tray 18 is located below the water film, and the first water pump 15 is used for conveying the cooling water in the water receiving tray 18 to the plate heat exchanger 14 so as to exchange heat with water from the demand side of the second water pump 20 in the plate heat exchanger 14;
the fan 17 is used for discharging the evaporated water vapor out of the shell;
The spraying pipe 16 is provided with a tenth valve 21, two branches extending out of the evaporative cooling heat exchanger 13 are arranged on a pipeline where the tenth valve 21 is positioned, the two branches are respectively communicated with an inlet and an outlet of the primary side of the plate heat exchanger 14, so that accurate water quantity control is facilitated, an eleventh valve 22 is arranged on the branch communicated with an inlet of the primary side of the plate heat exchanger 14, and a twelfth valve 23 is arranged on the branch communicated with the outlet of the primary side of the plate heat exchanger 14;
the second water pump 20 is provided on the cooling/heating pipe of the secondary side of the plate heat exchanger 14, which communicates with the external demand side.
In more detail, the shell of the evaporative cooling heat exchanger 13 is further provided with a first air inlet 24, and the first air inlet 24 is opposite to the water film for blowing air to the water film for heat exchange. In order to increase the heat exchange efficiency between the cooling water and the refrigerant pipe 19, a second air inlet 25 is further provided on the housing.
The heat recovery type evaporative cold heat pump A further comprises an air cooling heat exchanger 26, a water cooling heat exchanger 27, a compressor 28 and a reversing valve 29 which are connected through pipelines, so as to provide chilled water/hot water for the outer area dry pipe group and the inner area dry pipe group;
the inlet end of the air-cooled heat exchanger 26 is connected with the refrigerant pipe 19 of the evaporative cold heat exchanger 13 in a pipeline manner, and the outlet end of the air-cooled heat exchanger 26 is divided into two paths which are respectively connected with the first port of the reversing valve 29 and the compressor 28 in a pipeline manner;
the outlet end and the water inlet end of the secondary side of the water-cooling heat exchanger 27 are respectively connected with the outer area dry pipe group and the inner area dry pipe group through pipes;
the compressor 28 is communicated with a third port pipeline of the reversing valve 29, and a fourth port of the reversing valve 29 is connected with a refrigerant pipeline 19 pipeline of the evaporative cooling heat exchanger 13.
In order to accurately control the water/gas quantity, a pipeline between the reversing valve 29 and the evaporative cooling heat exchanger 13, a pipeline between the reversing valve 29 and the air cooling heat exchanger 26, an outlet pipeline of the refrigerant pipe 19 and an inlet of the air cooling heat exchanger 26 are all provided with a ninth valve 30 for controlling the flow rate of the refrigerant. An expansion valve 31 is arranged at the inlet end of the water-cooled heat exchanger 27.
Referring to fig. 1, the operation conditions and flow in the heat recovery type evaporative heat pump a of this embodiment are as follows:
① . Low temperature/medium Wen Gongleng:
The refrigerant flows from an outlet end of the water-cooled heat exchanger 27 to the second port of the reversing valve 29, then flows to the compressor 28 through the first port of the reversing valve 29 and returns to the reversing valve 29, enters the refrigerant pipe 19 through the fourth port of the reversing valve 29, exchanges heat with cooling water sprayed by the spray pipe 16 in the evaporative cooling heat exchanger 13, cools down, and flows out of the evaporative cooling heat exchanger 13, passes through the expansion valve 31 and returns to the water-cooled heat exchanger 27 to complete a refrigeration cycle. For example, the temperature of the low and medium temperature chilled water in the process may be 7/12 ℃, 12/17 ℃, respectively.
The cooling water enters the refrigerant pipe 19 in the evaporative cooling heat exchanger 13, the spraying pipe 16 is opened to spray the cooling water to the refrigerant pipe 19 to form a water film, the cooling water rises in temperature and flows downwards into the shell, at the moment, the first air inlet 24 is opened, so that the cooling water after flowing downwards exchanges heat with the air entering from the first air inlet 24 and then falls to a proper temperature, and then the cooling water is conveyed to the spraying pipe 16 through the tenth valve 21 by the first water pump 15 to be sprayed, so that one cycle is completed.
For example, the temperature of the cooling water may be 32/37 ℃.
② . Low temperature/medium Wen Gongleng, while free heating:
the running path of the refrigerant is the same as ① described above, and will not be described here again;
The cooling water enters the refrigerant pipe 19 in the evaporative cooling heat exchanger 13, the spray pipe 16 is opened to spray the cooling water to the refrigerant pipe 19 to form a water film, the cooling water rises in temperature and flows down into the shell, and then the cooling water is conveyed to the plate heat exchanger 14 through the eleventh valve 22 by the first water pump 15 for heat exchange, and the cooling water after heat exchange and temperature reduction flows through the twelfth valve 23 and returns to the spray pipe 16 for spraying so as to complete one cycle. In this process, the first air inlet 24 may be closed or adjusted according to the situation to control heat (the cooling water after flowing down exchanges heat with the air coming in from the first air inlet 24 and then can be cooled).
For example, the temperature of the cooling water may be 35/30 ℃.
③ . Free cooling in winter, the refrigerant does not run in the process:
The running path of the cooling water is the same as that of ② described above, and therefore, description thereof will not be repeated, wherein it is to be noted that the first air inlet 24 can be opened to improve the cooling efficiency.
For example, the temperature of the cooling water may be 12/17 ℃.
④ . Free cooling while heating:
the refrigerant is conveyed into the spray pipe 16 of the evaporative cooling heat exchanger 13 from the outlet end of the water-cooling heat exchanger 27 through the expansion valve 31 and the ninth valve 30, is discharged out of the evaporative cooling heat exchanger 13 to enter the reversing valve 29 after heat exchange and temperature rise of the refrigerant and cooling water, is connected with the compressor 28 through the first port of the reversing valve 29, is compressed by the compressor 28, returns to the reversing valve 29, is discharged out of the second port of the reversing valve 29 and is conveyed to the water-cooling heat exchanger 27, and thus a heating cycle is completed.
For example, the temperature of the warm water in the process may be 45/40 ℃.
The running path of the cooling water is the same as ②, and therefore, description is omitted, and the temperature of the cooling water in the process can be 12/17 ℃.
⑤ . Heat is supplied, and the evaporative cooling heat exchanger 13 does not operate in the process:
The operation path of the refrigerant is that the refrigerant is transported from the air-cooled heat exchanger 26 to the compressor 28 for compression, the refrigerant with high pressure enters from the third port of the reversing valve 29 and is transported to the water-cooled heat exchanger 27 through a pipeline from the second port, and the refrigerant with high temperature and high pressure is transported to the air-cooled heat exchanger 26 through the expansion valve 31 after heat exchange and temperature reduction in the water-cooled heat exchanger 27.
For example, the temperature of the warm water in the process may be 45/40 ℃.
According to the invention, the water temperature controlled by the two partitions is changed according to the energy consumption requirements of different types of buildings and different seasons. The following specific examples are described in terms of different types of building energy etc. (see examples 2-6):
Example 2
The system is applied to buildings with large heat productivity in inner areas, such as commercial projects (see fig. 2) in which the inner areas need to be cooled all the year round, and based on the content of the embodiment 1, the system for cooling and heating by the two-pipe evaporation cold and heat pump in the partition area further comprises a fresh air unit B, an air conditioner unit C and two fan coils D;
An outer area coil 32 and an inner area coil 33 are arranged in the fresh air unit B and the air conditioning unit C;
the two ends of the outer area coil pipe 32 are respectively communicated with the outer area water main pipe 1 and the outer area backwater main pipe 2, and the two ends of the inner area coil pipe 33 are respectively communicated with the inner area water main pipe 3 and the inner area backwater main pipe 4.
Two fan coils D, one of which is provided with an outer coil 32 serving an outer area and the other of which is provided with an inner coil 33 serving an inner area;
Wherein, the two ends of the outer area coil pipe 32 are respectively communicated with the outer area water main pipe 1 and the outer area backwater main pipe 2, and the two ends of the inner area coil pipe 33 are respectively communicated with the inner area water main pipe 3 and the inner area backwater main pipe 4.
In this embodiment, the fresh air unit B and the air conditioning unit C are four-pipe fresh air/air conditioning units, the fan coil D is two-pipe fan coils, the fan coil connected with the main pipe of the inner area only serves the inner area, and the fan coil connected with the main pipe of the outer area only serves the outer area.
The water supply and return temperature of the inner area water pipe is that the intermediate temperature chilled water in summer (for example, 12/17 ℃) and the intermediate temperature chilled water in transitional seasons (for example, 12/17 ℃) and the intermediate temperature chilled water in winter (for example, 12/17 ℃) respectively, and the specific working condition paths are as follows:
① . The chilled water after heat exchange flows out from the second valve 6 of the water-cooling heat exchanger 27, sequentially passes through the inner water main pipe 3, the inner coil 33, the inner backwater main pipe 4, the fourth valve 8 and the cold and hot water pump 34, and returns to the water-cooling heat exchanger 27 to form a cooling cycle.
This procedure is engaged with the refrigerant path of Wen Gongleng (①/② of example 1) in example 1 to form a complete working condition, which is not described in detail.
② . The intermediate-temperature chilled water in the transitional season is the same as the cooling path in ① summer, and will not be described here.
③ . The chilled water subjected to heat exchange in winter is discharged from the plate heat exchanger 14, and returns to the plate heat exchanger 14 through the sixth valve 10, the inner water main pipe 3, the inner coil 33, the inner water return main pipe 4, the eighth valve 12 and the second water pump 20 to form a cooling system.
This procedure is engaged with the refrigerant path of Wen Gongleng (④ of example 1) in example 1 to form a complete working condition, which is not described in detail.
The water supply and return temperature of the water pipe at the outer region is that the low-temperature chilled water (for example, 7/12 ℃) in summer, the water pipe is not operated in transitional seasons, the medium-temperature hot water (for example, 45/40 ℃) in winter, and the specific working condition paths are as follows:
① . The chilled water subjected to heat exchange flows out from the first valve 5 of the water-cooling heat exchanger 27, sequentially passes through the outer water supply pipeline, the outer coil pipe 32, the outer backwater main pipe 2, the third valve 7 and the cold and hot water pump 34, and then returns to the water-cooling heat exchanger 27, so that a cooling cycle is formed.
This procedure is engaged with the refrigerant path of Wen Gongleng (①/② of example 1) in example 1 to form a complete working condition, which is not described in detail.
② . The middle-temperature hot water in winter is the same as the low-temperature chilled water in ① summer in path, and the description is omitted here.
This procedure is linked with the refrigerant path of example 1 for free cooling (④ as in example 1) while supplying heat to form a complete working condition, and will not be described in detail.
More specifically, in summer, if the system has a dehumidification requirement in a transitional season, the temperature of the water supply and return of the inner area water pipe can be adjusted to be low-temperature chilled water (for example, 7/12 ℃ in the same running path as the cooling path in summer of the inner area ①), the temperature of the water supply and return of the outer area water pipe can be adjusted to be low-temperature hot water (for example, 35/30 ℃ in the running path that the water subjected to heat exchange by the plate heat exchanger 14 returns to the plate heat exchanger 14 after passing through the fifth valve 9, the outer area water main pipe 1, the outer area coil 32, the outer area water main pipe 2, the seventh valve 11 and the second water pump 20), and fresh air is frozen and dehumidified first and then reheated to meet the dehumidification requirement.
Example 3
For a common fan coil and fresh air system, such as an office building (see fig. 3), based on the content of embodiment 1, the cooling and heating system with the two-pipe evaporation and cooling pump in a partition further comprises a fresh air unit B, an air conditioning unit C and a fan coil D;
An outer area coil 32 and an inner area coil 33 are arranged in the fresh air unit B and the air conditioning unit C;
the two ends of the outer area coil pipe 32 are respectively communicated with the outer area water main pipe 1 and the outer area backwater main pipe 2, and the two ends of the inner area coil pipe 33 are respectively communicated with the inner area water main pipe 3 and the inner area backwater main pipe 4.
An inner area coil 33 is arranged in the fan coil D, and two ends of the fan coil D are respectively communicated with the inner area water main pipe 3 and the inner area backwater main pipe 4.
In this embodiment, the fresh air unit B and the air conditioning unit C are four-pipe fresh air/air conditioning units, the fan coil D is two-pipe fan coils, and the two-pipe fan coils are connected in parallel with the inner-area main pipe.
The water supply and return temperatures of the inner area water pipe are the same as those of the intermediate temperature chilled water in summer (for example, 12/17 ℃), the low temperature chilled water in transition season (for example, 7/12 ℃) and the intermediate temperature hot water in winter (for example, 45/40 ℃), and the specific working condition paths of the intermediate temperature chilled water in summer, the low temperature chilled water in transition season and the intermediate temperature hot water in winter are the same as those of the ① summer cooling path in the inner area in the embodiment 2, and no description is repeated here.
The cooling process is connected to the refrigerant path of the medium Wen Gongleng (①/② in example 1) in example 1 to form a complete working condition, which is not described herein, and the heating process is connected to the refrigerant path of the medium-temperature heat supply (⑤ in example 1) in example 1 to form a complete working condition, which is not described herein.
The water supply and return temperature of the water pipe at the outer region is that the water pipe at the outer region is low-temperature chilled water in summer (for example, 7/12 ℃) and hot water in transitional seasons (for example, 35/30 ℃) and warm water in winter (for example, 45/40 ℃), and the specific working condition paths are as follows:
① . The specific working condition paths of the low-temperature chilled water in summer and the medium-temperature hot water in winter are the same as those of the low-temperature chilled water in ① hours in the outer area in the embodiment 2, and are not described in detail here.
② . And low-temperature hot water in the transitional season returns to the plate heat exchanger 14 after heat exchange by the fifth valve 9, the outer region water main pipe 1, the outer region coil pipe 32, the outer region return water main pipe 2, the seventh valve 11 and the second water pump 20 so as to form a heating cycle.
This procedure is coupled with the path of the cooling water of example 1 (② of example 1) to form a complete working condition, which is not described in detail.
The inner area coil 33 mentioned in the application process of this embodiment may be the inner area coil 33 in the fresh air unit B, the air conditioning unit C and the fan coil D, and the outer area coil may be the outer area coil 32 in the fresh air unit B, the air conditioning unit C and the fan coil D, which are specifically selected according to specific situations and are not limited herein one by one.
Example 4
For an air volume variable system, such as an office building (see fig. 4) of the air volume variable system, based on the content of embodiment 1, the cooling and heating system of the two-pipe evaporation cooling and heating pump of a partition further comprises a fresh air unit B, an air conditioning unit C and a fan coil D;
an outer area coil 32 is arranged in the fresh air unit B, and an inner area coil 33 is arranged in the air conditioning unit C;
the two ends of the outer area coil pipe 32 are respectively communicated with the outer area water main pipe 1 and the outer area backwater main pipe 2, and the two ends of the inner area coil pipe 33 are respectively communicated with the inner area water main pipe 3 and the inner area backwater main pipe 4.
The fan coil D is internally provided with an outer region coil 32, and two ends of the fan coil D are respectively communicated with the outer region water supply main pipe 1 and the outer region return water main pipe 2.
In the embodiment, a fresh air unit B, an air conditioner unit C and a fan coil D all adopt two control devices, wherein the fresh air unit B is connected with an outer area main pipe, the air conditioner unit C is connected with an inner area main pipe, and the fan coil D is connected with an outer area main pipe.
The water supply and return temperature of the inner area water pipe is that low-temperature chilled water in summer (for example, 7/12 ℃) and low-temperature chilled water in transitional seasons (for example, 7/12 ℃) and medium-temperature chilled water in winter (for example, 12/17 ℃). The water running paths of the low-temperature chilled water in summer and the low-temperature chilled water in transitional seasons are the same as those of the medium-temperature chilled water in ① of the inner region in embodiment 2, and will not be described in detail herein, and the water running paths of the medium-temperature chilled water in winter are the same as those of the medium-temperature chilled water in ③ of the inner region in embodiment 2, and will not be described in detail herein.
The water supply and return temperature of the water pipe at the outer region is that of low-temperature chilled water (for example, 7/12 ℃) in summer, low-temperature hot water (for example, 35/30 ℃) in transitional seasons and medium-temperature hot water (for example, 45/40 ℃) in winter. The water paths of the low-temperature chilled water in summer and the medium-temperature hot water in winter are the same as the ① low-temperature chilled water running path in summer in the outer region in the embodiment 2, and are not described in detail herein, and the running path of the low-temperature hot water in the transition season is the same as the running path of the low-temperature hot water in the transition season in the outer region ② in the embodiment 3, and are not described in detail herein.
Example 5
Based on the content of the embodiment 1, the cooling and heating system of the two-pipe evaporation cold and heat pump in the partition further comprises a fresh air unit B and an air conditioning unit C, and a fan coil D with an outer area coil 32 and an inner area coil 33 is arranged in the air conditioning unit C;
An outer area coil 32 and an inner area coil 33 are arranged in the fresh air unit B and the air conditioning unit C;
the two ends of the outer area coil pipe 32 are respectively communicated with the outer area water main pipe 1 and the outer area backwater main pipe 2, and the two ends of the inner area coil pipe 33 are respectively communicated with the inner area water main pipe 3 and the inner area backwater main pipe 4.
In the fan coil D, two ends of the outer area coil 32 are respectively communicated with the outer area water main pipe 1 and the outer area backwater main pipe 2, and two ends of the inner area coil 33 are respectively communicated with the inner area water main pipe 3 and the inner area backwater main pipe 4.
In the embodiment, the fresh air unit B, the air conditioner unit C and the fan coil D all adopt four-pipe equipment, and the two coils are respectively connected with an inner area main pipe and an outer area main pipe.
The water supply and return temperatures of the inner area water pipes are the same as those of the intermediate temperature chilled water in summer (for example, 12/17 ℃), intermediate temperature chilled water in transitional seasons (for example, 12/17 ℃) and intermediate temperature hot water in winter (for example, 45/40 ℃), and the water running paths of the intermediate temperature chilled water in summer, the intermediate temperature chilled water in transitional seasons and the intermediate temperature hot water in winter are the same as those of the intermediate temperature chilled water in ① of the inner area in the embodiment 2, and no description is given here;
The water supply and return temperatures of the outer region water pipe are the same as those of the outer region ① in the embodiment 2, and the water operation paths of the transition season low-temperature hot water are the same as those of the outer region ② in the embodiment 3, and are not described in detail;
Example 6
For the process air conditioning system, the system diagram of the embodiment is the same as that of embodiment 3, namely the connected fresh air unit B, air conditioning unit C and fan coil D are the same, but the working conditions are different;
in the embodiment, the fresh air unit B and the air conditioning unit C adopt four-pipe fresh air/air conditioning units, the fan coil D adopts two-pipe fan coils, and the two-pipe fan coils are connected with an inner-area main pipe in parallel.
The water supply and return temperatures of the inner area water pipe are the same as the summer low-temperature chilled water (e.g. 7/12 ℃), the transition season low-temperature chilled water (e.g. 7/12 ℃) and the winter medium-temperature hot water (e.g. 45/40 ℃), and the operation paths of the summer low-temperature chilled water, the transition season low-temperature chilled water and the winter medium-temperature hot water are the same as the summer cooling path ① in the embodiment 2, and no description is given here.
The return water supply temperature of the outer region water pipe is that the summer low-temperature hot water (for example, 35/30 ℃), the transition season low-temperature hot water (for example, 35/30 ℃) and the winter medium-temperature hot water (for example, 45/40 ℃), the running path of the summer low-temperature hot water and the transition season low-temperature hot water are the same as the running path of the outer region ② transition season low-temperature hot water in the embodiment 3, and are not described in detail herein;
In embodiments 2-6, the inner area coil may be an inner area coil of the fresh air unit B, the air conditioning unit C, or the fan coil D, and the outer area coil may be an outer area coil of the fresh air unit B, the air conditioning unit C, or the fan coil D, which is specifically selected according to specific situations.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and the parts of an embodiment that are not described in detail may be referred to in the description of other embodiments, and meanwhile, principles or motion paths that are not described in detail are well known to those skilled in the art and are not described in detail.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (10)

1. The cold and heat supply system of the two-pipe type evaporation cold and heat pump in the subregion is characterized by comprising a heat recovery type evaporation cold and heat pump A, an outer area dry pipe group and an inner area dry pipe group;
The chilled water outlet pipe and the return pipe of the heat recovery type evaporative cold heat pump A are communicated with the inner area dry pipe group and the outer area dry pipe group through pipes and used for supplying cold and heat to the inner area and the outer area;
The hot water outlet pipe and the water return pipe of the heat recovery type evaporative cold heat pump A are communicated with the inner area dry pipe group and the outer area dry pipe group through pipelines and used for supplying cold and heat to the inner area and the outer area;
The heat recovery type evaporative cooling heat pump A comprises an evaporative cooling heat exchanger (13), a plate heat exchanger (14) and a first water pump (15), wherein the evaporative cooling heat exchanger (13) is communicated with a water inlet end pipeline and a water outlet end pipeline of the primary side of the plate heat exchanger (14), and the water inlet end and the water outlet end of the secondary side of the plate heat exchanger (14) are connected with an outer area dry pipe group and an inner area dry pipe group pipeline;
the water outlet of the first water pump (15) is communicated with a water inlet pipeline at the primary side of the plate heat exchanger (14) and is used for conveying cooling water to the plate heat exchanger (14) and then exchanging heat or refluxing the cooling water to the evaporative cooling heat exchanger (13);
The heat recovery type evaporative cold heat pump A further comprises an air-cooled heat exchanger (26), a water-cooled heat exchanger (27), a compressor (28) and a reversing valve (29) which are connected through pipelines, wherein the inlet end of the air-cooled heat exchanger (26) is connected with a refrigerant pipe (19) of the evaporative cold heat exchanger (13) in a pipeline manner, and the outlet end of the air-cooled heat exchanger (26) is divided into two paths which are respectively connected with a first port of the reversing valve (29) and the compressor (28) in a pipeline manner;
The outlet end of the primary side of the water-cooled heat exchanger (27) is communicated with the second port of the reversing valve (29), and the inlet end of the water-cooled heat exchanger is connected with the refrigerant pipe (19) of the evaporative cooling heat exchanger (13) in a pipeline manner, and the water outlet end and the water inlet end of the secondary side of the water-cooled heat exchanger (27) are connected with the outer area dry pipe group and the inner area dry pipe group in a pipeline manner;
And a fourth port of the reversing valve (29) is connected with a refrigerant pipe (19) of the evaporative cooling heat exchanger (13) in a pipeline manner.
2. A zoned two-pipe evaporative heat pump cooling and heating system according to claim 1, characterized in that the inlet end of the water-cooled heat exchanger (27) is provided with an expansion valve (31).
3. The cold and heat supply system of the partitioned two-pipe evaporative heat pump according to claim 1, wherein the outer-area dry pipe group comprises an outer-area water main pipe (1) and an outer-area backwater main pipe (2);
The inner area main pipe group comprises an inner area water main pipe (3) and an inner area backwater main pipe (4);
Wherein, the chilled water outlet pipe of the heat recovery type evaporation cold heat pump A is divided into two paths, one path is connected with the outer region water main pipe (1) and provided with a first valve (5) thereon, and the other path is connected with the inner region water main pipe (3) and provided with a second valve (6) thereon;
the chilled water return pipe of the heat recovery type evaporation cold heat pump A is divided into two paths, one path is connected with the outer area return water main pipe (2) and is provided with a third valve (7) thereon, and the other path is connected with the inner area return water main pipe (4) and is provided with a fourth valve (8) thereon;
the hot water outlet pipe of the heat recovery type evaporation cold heat pump A is divided into two paths, one path is connected with the outer region water main pipe (1) and is provided with a fifth valve (9) thereon, and the other path is connected with the inner region water main pipe (3) and is provided with a sixth valve (10) thereon;
The hot water return pipe of the heat recovery type evaporation cold heat pump A is divided into two paths, one path is connected with the outer area return water main pipe (2) and is provided with a seventh valve (11) thereon, and the other path is connected with the inner area return water main pipe (4) and is provided with an eighth valve (12) thereon.
4. The cold and heat supply system of the partitioned two-pipe evaporative heat pump according to claim 3, further comprising a fresh air unit B and an air conditioner unit C;
An outer area coil (32) and an inner area coil (33) are arranged in the fresh air unit B and the air conditioning unit C;
The two ends of the outer area coil pipe (32) are respectively communicated with the outer area water main pipe (1) and the outer area backwater main pipe (2), and the two ends of the inner area coil pipe (33) are respectively communicated with the inner area water main pipe (3) and the inner area backwater main pipe (4).
5. A zoned two-tube evaporative heat pump cooling and heating system according to claim 4, further comprising two fan coils D, one of said fan coils D having an outer zone coil (32) disposed therein for serving an outer zone and the other of said fan coils D having an inner zone coil (33) disposed therein for serving an inner zone;
Wherein, the both ends of outer district coil pipe (32) are respectively with outer district water main (1), outer district return water main (2) intercommunication, the both ends of interior district coil pipe (33) are respectively with interior district water main (3), interior district return water main (4) intercommunication.
6. A zoned two-pipe evaporative heat pump cooling and heating system according to claim 3, characterized in that the evaporative heat exchanger (13) further comprises a spray pipe (16), a fan (17) and a water pan (18) in the housing thereof;
The spray pipe (16) is positioned above the refrigerant pipe (19) to spray cooling water to the refrigerant pipe (19) to form a water film, the water receiving disc (18) is positioned below the water film, and the first water pump (15) is used for conveying the cooling water in the water receiving disc (18) to the plate heat exchanger (14) so as to exchange heat with water from the requirement side of the second water pump (20) in the plate heat exchanger (14);
the fan (17) is used for discharging the evaporated water vapor out of the shell;
The spray pipe (16) is provided with a tenth valve (21), two branches extending out of the evaporative cooling heat exchanger (13) are arranged on a pipeline where the tenth valve (21) is located, and the two branches are respectively communicated with an inlet and an outlet of the primary side of the plate heat exchanger (14).
7. The system according to claim 6, wherein the shell of the evaporative heat exchanger (13) is further provided with a first air inlet (24), and the first air inlet (24) is opposite to the water film for blowing air to the water film for heat exchange.
8. A method for supplying cold and heat to a district heating system with two-pipe evaporative heat and cold pumps, applied to a district heating system with two-pipe evaporative heat and cold pumps as set forth in any one of claims 3-7, comprising the steps of:
Step one, partitioning according to the air treatment process, wherein the same treatment process is classified into the same partition;
Secondly, formulating water temperatures required in corresponding subareas according to energy requirements of different seasons and different buildings, and then performing variable water temperature operation;
The variable water temperature operation is realized by adjusting the operation condition of the heat recovery type evaporative cold heat pump A and matching with the switching of valves on the outer zone dry pipe group and the inner zone dry pipe group.
9. The method for supplying cold and heat in a partitioned two-pipe evaporative heat pump cooling and heat supply system according to claim 8, wherein the air treatment process comprises three steps of cooling, heating, cooling and heating;
When the air conditioner is divided into an outer area and an inner area, and a fresh air unit B, an air conditioner unit C and a fan coil D are connected according to scene requirements to perform cooling and heating.
10. The cold and heat supply method of the cold and heat supply system of the two-pipe type evaporation and heat pump with the partition according to claim 8, wherein valves on the outer area main pipe group and the inner area main pipe group are the first valve (5), the second valve (6), the third valve (7), the fourth valve (8), the fifth valve (9), the sixth valve (10), the seventh valve (11) and the eighth valve (12).
CN202410451723.7A 2024-04-16 2024-04-16 A zoned two-pipe evaporative heat pump cooling and heating system Active CN118463425B (en)

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