CN112050305A - Multi-zone air conditioning system and operation method thereof - Google Patents
Multi-zone air conditioning system and operation method thereof Download PDFInfo
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- CN112050305A CN112050305A CN202010988585.8A CN202010988585A CN112050305A CN 112050305 A CN112050305 A CN 112050305A CN 202010988585 A CN202010988585 A CN 202010988585A CN 112050305 A CN112050305 A CN 112050305A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 75
- 238000001816 cooling Methods 0.000 claims description 74
- 238000010438 heat treatment Methods 0.000 claims description 43
- 230000017525 heat dissipation Effects 0.000 claims description 42
- 238000000605 extraction Methods 0.000 claims description 26
- 238000011084 recovery Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 2
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- 239000013589 supplement Substances 0.000 description 4
- 239000000110 cooling liquid Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
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- 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
- F24F3/06—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 arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—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 arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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Abstract
The embodiment of the invention provides a multi-zone air conditioning system and an operation method thereof. This air conditioning system includes: the heat pump unit comprises a heat pump unit and a plurality of three-medium heat exchangers, wherein the three-medium heat exchangers are connected in parallel to the heat pump unit, cold supply channels in the three-medium heat exchangers are connected with an evaporator of the heat pump unit through a cold supply main liquid supply pipe and a cold supply main liquid return pipe to form a cold supply circulation loop, heat supply channels in the three-medium heat exchangers are connected with a condenser of the heat pump unit through a heat supply main liquid supply pipe and a heat supply main liquid return pipe to form a heat supply circulation loop, a cold supply valve is arranged at an inlet or an outlet of the cold supply channel of each three-medium heat exchanger, and a heat supply valve is arranged at an inlet or an outlet of. The multi-zone air conditioning system has the advantages of simple structure and low cost, can realize various operation modes, and is particularly suitable for a plurality of service zones with annual cold and hot demands.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-zone air conditioning system and an operation method thereof.
Background
In a building air conditioning system, different cooling and heating requirements exist between different service areas under many conditions, for example, the inner and outer areas of a building often need cooling in summer, the inner area still needs cooling and the outer area needs heating in winter, and the inner and outer areas in transitional seasons need cooling or heating according to needs. In these air conditioning systems, which have frequent alternating or simultaneous cooling and heating needs, it is often necessary to provide both cold and hot water supply pipes.
As an efficient air supply device for an air conditioner, an air conditioning box and a fan coil are widely used in a building space. In the tail end of a conventional fan coil and an air conditioning box, cold water or hot water flows through the coil to supply cold or heat to the indoor space, and the conventional fan coil and the air conditioning box are generally used in a dual-control air conditioning system, namely, winter heat supply and summer heat supply are carried out in the same system, so that when some areas need heat supply and some areas need cold supply, the requirements cannot be met. The tail end of a traditional fan coil and an air conditioning box can be switched to realize the conversion of working conditions of cooling and heating through a plurality of groups of valves in an air conditioning system which is simultaneously provided with a cold water supply pipeline and a hot water supply pipeline, but the working conditions of cooling and heating are difficult to realize the stable and accurate regulation of cooling or heating because the cooling and the heating share the same coil, the hydraulic balance is not favorably controlled, and certain mixing heat transfer loss exists.
Disclosure of Invention
The embodiment of the invention provides a multi-zone air conditioning system and an operation method thereof, which are used for solving the problems that in the prior art, a cooling and heating system of a fan coil and an air conditioning box is difficult to realize flexible and stable switching of cooling and heating conditions, different service zones are difficult to simultaneously meet cooling and heating requirements, and a multi-water-supply-pipe system is complex in pipeline connection and high in investment.
According to a first aspect of embodiments of the present invention, there is provided a multi-zone air conditioning system including: a heat pump unit, a plurality of three-medium heat exchangers, a heat extraction device, a heat extraction valve, a heat dissipation device and a heat dissipation valve, wherein the three-medium heat exchangers are connected in parallel with the heat pump unit, a cold supply channel in each three-medium heat exchanger is connected with an evaporator of the heat pump unit through a cold supply main liquid supply pipe and a cold supply main liquid return pipe to form a cold supply circulation loop, a heat supply channel in each three-medium heat exchanger is connected with a condenser of the heat pump unit through a heat supply main liquid supply pipe and a heat supply main liquid return pipe to form a heat supply circulation loop, a cold supply valve is arranged at an inlet or an outlet of the cold supply channel of each three-medium heat exchanger, a heat extraction valve is arranged at an inlet or an outlet of the heat extraction device, the heat dissipation device is connected between the heat supply main liquid supply pipe and the heat supply main liquid return pipe, and the heat dissipation valve is arranged at an inlet or an outlet of the heat dissipation device.
The main cooling liquid supply pipe or the main cooling liquid return pipe is provided with a cooling circulating pump, and the main heating liquid supply pipe or the main heating liquid return pipe is provided with a heating circulating pump.
The heat exchanger comprises three medium heat exchangers and is characterized by further comprising an inter-area circulating pump, wherein the inter-area circulating pump is arranged in the cold supply channel or the heat supply channel connected between the two adjacent three medium heat exchangers.
Wherein, the heat extraction device is a ground heat exchanger.
Wherein, the heat dissipation device is a cooling tower.
The heat taking device and the heat radiating device are combined into a three-medium heat exchanger, and the heat taking device and the heat radiating device are two liquid channels of the three-medium heat exchanger respectively.
According to another aspect of the embodiments of the present invention, there is provided an operation method of a multi-zone air conditioning system according to the first aspect of the embodiments of the present invention, including:
respectively installing each three-medium heat exchanger in a corresponding service area;
when all service areas need cooling, all cooling valves are opened, all heating valves are closed, a condenser of the heat pump unit dissipates heat into the heat dissipation device, and cooling circulation liquid supplied by an evaporator of the heat pump unit exchanges heat with the service areas through the three-medium heat exchanger for cooling;
when all service areas need to supply heat, all heat supply valves are opened, all cold supply valves are closed, an evaporator of the heat pump unit takes heat from a heat taking device, and heat supply circulating liquid supplied by a condenser of the heat pump unit exchanges heat with the service areas through a three-medium heat exchanger to supply heat;
when part of service areas need to supply heat and part of service areas need to supply cold, a heat supply valve of the service area needing to supply heat is opened, a corresponding cold supply valve is closed, and heat supply circulating liquid supplied by a condenser of the heat pump unit exchanges heat with the service areas through the three-medium heat exchanger to supply heat; opening a cold supply valve of a service area needing cold supply and closing a corresponding heat supply valve, and exchanging heat and supplying cold with the service area through a three-medium heat exchanger by cold supply circulating liquid supplied by an evaporator of a heat pump unit;
when redundant cold energy exists in the system, opening a heat-taking valve, and taking heat through a heat-taking device; when redundant heat exists in the system, the heat dissipation valve is opened, and heat dissipation is carried out through the heat dissipation device.
The multi-zone air conditioning system and the operation method thereof provided by the embodiment of the invention adopt the three-medium heat exchanger to replace an indoor fan coil or an air conditioning box in the prior art, provide cold and hot circulating liquid for the three-medium heat exchanger through the heat pump unit to supply cold and heat for the room, the tail end of the same three-medium heat exchanger simultaneously comprises a cold supply pipeline and a heat supply pipeline, so that the two mediums are not mixed, the on-off and flow of the cold and hot mediums can be controlled by adjusting a cold supply valve and a heat supply valve for different service zones, the cold supply and heat supply requirements of different service zones are met, and the heat supply and cold supply strategies are flexibly adjusted. The multi-zone air conditioning system provided by the embodiment of the invention has the advantages of simple structure and low cost, can realize multiple operation modes, and is particularly suitable for multiple service zones with annual cold and heat demands.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a multi-zone air conditioning system according to the present invention;
FIG. 2 is a schematic structural view of embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of embodiment 2 of the present invention;
FIG. 4 is a schematic structural view of embodiment 3 of the present invention;
FIG. 5 is a schematic structural view of embodiment 4 of the present invention;
fig. 6 is a schematic structural diagram of embodiment 5 of the present invention.
Reference numerals:
1: a condenser; 2: a heat supply circulating pump; 3: a heat supply main liquid supply pipe; 4: an evaporator; 5: a cooling circulation pump; 6: a cooling main liquid supply pipe; 7: a three-medium heat exchanger; 8: a cooling valve; 9: a heat supply valve; 10: a service area; 10-1: a first service area; 10-N: an Nth service area; 11: a heat supply main liquid return pipe; 12: a compressor; 13: a throttling device; 14: a cooling main liquid return pipe; 15: a cooling channel; 16: a heat supply channel; 17: an inter-zone circulating pump; 18: a heat removal device; 19: a heat extraction valve; 20: a heat sink; 21: heat dissipation valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection can be mechanical connection or point connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A multi-zone air conditioning system according to an embodiment of the present invention will be described with reference to fig. 1 to 6, including: the heat pump unit, a plurality of three-medium heat exchangers 7, a heat taking device 18, a heat taking valve 19, a heat radiating device 20 and a heat radiating valve 21, wherein the three-medium heat exchangers 7 are connected in parallel to the heat pump unit, a cold supply channel 15 in each three-medium heat exchanger 7 is connected with an evaporator of the heat pump unit through a cold supply main liquid supply pipe 6 and a cold supply main liquid return pipe 14 to form a cold supply circulation loop, a heat supply channel 16 in each three-medium heat exchanger 7 is connected with a condenser of the heat pump unit through a heat supply main liquid supply pipe 3 and a heat supply main liquid return pipe 11 to form a heat supply circulation loop, a cold supply valve 8 is arranged at an inlet or an outlet of the cold supply channel 15 of each three-medium heat exchanger 7, a heat supply valve 9 is arranged at an inlet or an outlet of the heat supply channel 16 of each three-medium heat exchanger 7, the heat taking device 18 is connected between the cold supply main liquid supply pipe 6 and the cold supply, the heat sink 20 is connected between the heat supply main liquid supply pipe 3 and the heat supply main liquid return pipe 11, and the heat sink valve 21 is disposed at the inlet or the outlet of the heat sink 20.
Specifically, in this embodiment, the three-medium heat exchanger 7 is adopted to replace a conventional air conditioner air supply terminal (an air outlet terminal such as an indoor fan coil) to be installed in different service areas 10, and the three-medium heat exchanger 7 includes two channels (i.e., a heat supply channel 16 and a cold supply channel 15) connected to the heat pump unit, and the two channels are respectively used for being connected to the condenser 1 and the evaporator 4 of the heat pump, wherein the condenser 1 and the evaporator 4 in the heat pump unit respectively supply circulating liquids with different temperatures, so that air and the circulating liquid exchange heat under the action of a fan of the three-medium heat exchanger 7, and then supply cold or heat to the service areas 10. The heat pump unit can provide a heat exchange cold source or heat source for the three-medium heat exchanger 7 by supplying a relatively cold or relatively hot circulating liquid.
A cold supply channel 15 in the three-medium heat exchanger 7 is connected with an evaporator 4 of the heat pump unit through a cold supply main liquid supply pipe 6 and a cold supply main liquid return pipe 14 to form a cold supply circulation loop, and the circulation liquid serving as a cold supply function moves directionally in the cold supply circulation loop to convey cold; the heat supply channel 16 in the three-medium heat exchanger 7 is connected with the condenser 1 of the heat pump unit through the heat supply main liquid supply pipe 3 and the heat supply main liquid return pipe 11 to form a heat supply circulation loop, and the circulation liquid serving as the heat supply function moves directionally in the heat supply circulation loop to convey heat.
A cold supply valve 8 is arranged at the inlet or the outlet of a cold supply channel 15 of each three-medium heat exchanger 7, a heat supply valve 9 is arranged at the inlet or the outlet of a heat supply channel 16 of each three-medium heat exchanger 7, the on-off and the flow of circulating liquid can be adjusted, and specifically, when a service area 10 needs to supply cold, only the cold supply valve 8 corresponding to the service area 10 is opened; when the service area 10 needs heating, only the heating valve 9 of the corresponding service area 10 is opened. Since the cooling valve 8 and the heating valve 9 are provided in each of the three-medium heat exchangers 7, the cooling or heating capacity of the service area 10 can be further controlled by adjusting the opening degrees of the cooling valve 8 and the heating valve 9.
A heat taking device 18 is adopted to provide heat taking circulating liquid for the evaporator 4 so as to supplement heat to the system, eliminate redundant cold energy and adjust the cold-heat balance of the system, and a heat taking valve 19 can be adopted to control the flow of the heat taking circulating liquid; the heat dissipation device 20 is used for supplying heat dissipation circulating liquid to the condenser 1, discharging redundant heat in the system, adjusting the cold-heat balance of the system, and the flow of the heat dissipation circulating liquid can be controlled by a heat dissipation valve 21. When the system has redundant cold energy, the heat extraction valve 19 is opened, and heat is extracted through the heat extraction device 18; when there is excess heat in the system, the heat dissipation valve 21 is opened to dissipate the heat through the heat dissipation device 20
The multi-zone air conditioning system and the operation method thereof provided by the embodiment of the invention adopt the three-medium heat exchanger 7 to replace an indoor fan coil or an air conditioning box in the prior art, provide cold and hot media to the three-medium heat exchanger 7 through a heat pump unit so as to supply cold and heat indoors, the tail end of the same three-medium heat exchanger 7 simultaneously comprises a cold supply channel 15 and a heat supply channel 16, so that the two media are not mixed, the on-off and the flow of the cold and hot media can be controlled by adjusting a cold supply valve 8 and a heat supply valve 9 for different service areas 10, the cold and heat supply requirements of different service areas 10 are met, and the heat supply and cold supply strategies are flexibly adjusted. The multi-zone air conditioning system provided by the embodiment of the invention has the advantages of simple structure and low cost, can realize multiple operation modes, and is particularly suitable for multiple service zones 10 with annual cold and heat demands.
In one embodiment, a cooling circulation pump 5 is provided in the cooling main supply pipe 6 or the cooling main return pipe 14, and a heating circulation pump 2 is provided in the heating main supply pipe 3 or the heating main return pipe 11. In the present embodiment, the circulation liquid in the cooling circulation loop can directionally circulate through the cooling circulation pump 5, and the circulation liquid in the heating circulation loop can directionally circulate through the heating circulation pump 2.
In one embodiment, the heat pump unit comprises a compressor 12, a condenser 1, a throttling device 13 and an evaporator 4 which are connected in sequence.
The cooling channel 15 in the three-medium heat exchanger 7 is connected with the evaporator 4 through the cooling main liquid supply pipe 6 and the cooling main liquid return pipe 14 to form a cooling circulation loop, so that the cooling circulation liquid in the evaporator 4 enters the three-medium heat exchanger 7, absorbs heat from indoor air under the action of an upper fan of the three-medium heat exchanger 7, returns to the evaporator 4 to release heat, and circulates in this way to supply cooling for the service area 10. The heat supply channel 16 in the three-medium heat exchanger 7 is connected with the condenser 1 through the heat supply main liquid supply pipe 3 and the heat supply main liquid return pipe 11 to form a heat supply circulation loop, so that the heat supply circulation liquid in the condenser 1 enters the three-medium heat exchanger 7, releases heat to indoor air under the action of an upper fan of the three-medium heat exchanger, returns to the condenser 1 to absorb heat, and circulates in this way to supply heat for the service area 10.
In one embodiment, as shown in fig. 6, the multi-zone air conditioning system of this embodiment further includes an inter-zone circulating pump 17, and the inter-zone circulating pump 17 is disposed in the cooling channel 15 or the heating channel 16 connected between any two three-medium heat exchangers 7. In the present embodiment, the circulating liquid can be made to flow directionally in the three-medium heat exchanger 7 between the designated service areas 10 by the inter-area circulating pump 17 to regulate the heat transfer between the respective service areas 10.
In one embodiment, the heat extraction device 18 may be a heat extraction apparatus such as a borehole heat exchanger.
In one embodiment, the heat dissipation device 20 may be a heat dissipation apparatus such as a cooling tower.
In one embodiment, the heat extraction device 18 and the heat dissipation device 20 are combined into a three-medium heat exchanger, and the heat extraction device 18 and the heat dissipation device 20 are two liquid channels of the three-medium heat exchanger respectively.
The embodiment of the invention also provides an operation method of the multi-zone air conditioning system based on the embodiment, which comprises the following steps:
installing each three-medium heat exchanger 7 in a corresponding service area 10;
1. when all service areas 10 need cooling, all cooling valves 8 are opened, all heating valves 9 are closed, the condenser 1 of the heat pump unit radiates heat into the heat radiating device 20, and cooling circulation liquid supplied by the evaporator 4 of the heat pump unit exchanges heat with the service areas 10 through the three-medium heat exchanger 7 for cooling.
2. When all service areas 10 need heat supply, all heat supply valves 9 are opened, all cold supply valves 8 are closed, the evaporator 4 of the heat pump unit takes heat from the heat-taking device 18, and heat supply circulating liquid supplied by the condenser 1 of the heat pump unit exchanges heat with the service areas 10 through the three-medium heat exchanger 7 to supply heat.
3. When part of the service areas 10 need to supply heat and part of the service areas 10 need to supply cold, the heat supply valves 9 of the service areas 10 needing heat supply are opened, the corresponding cold supply valves 8 are closed, and heat supply circulating liquid supplied by the condenser 1 of the heat pump unit exchanges heat with the service areas 10 through the three-medium heat exchanger 7 to supply heat; and opening a cold supply valve 8 of a service area 10 needing cold supply and closing a corresponding heat supply valve 9, and exchanging heat and supplying cold with the service area 10 through a three-medium heat exchanger 7 by cold supply circulating liquid supplied by a heat pump unit evaporator 4.
When the system has redundant cold energy, the heat extraction valve 19 is opened, and heat is extracted through the heat extraction device 18; when there is excess heat in the system, the heat dissipation valve 21 is opened, and heat dissipation is performed by the heat dissipation device 20.
In one embodiment, the method further comprises the step of regulating the heat recovery of the three-medium heat exchanger between the zones by using the zone-to-zone circulating pump, and the specific heat recovery method is as described in embodiment 5.
Specifically, the operation method of the present embodiment is illustrated by the following four embodiments:
example 1: as shown in fig. 2, when all the service areas 10 need cooling, the heat dissipation valve 21 and the cooling valves 8 on the cooling channels 15 in the three-medium heat exchangers 7 in all the service areas 10 are opened, and the heat extraction valve 19 and the heating valves 9 on the heating channels 16 in the three-medium heat exchangers 7 in all the service areas 10 are closed; the cooling circulating pump 5 is started, and the heating circulating pump 2 and the inter-area circulating pump 17 are closed; the compressor 12 is turned on.
The cooling circulation liquid releases heat to the evaporator 4, flows through the three-medium heat exchanger 7 under the action of the cooling circulation pump 5, absorbs heat from indoor air under the action of an upper fan of the three-medium heat exchanger, returns to the evaporator 4 to release heat continuously, and circulates in such a way to supply cold to all service areas 10, and the cold distribution among the areas is adjusted by the cooling valves 8 corresponding to the service areas 10.
Example 2: as shown in fig. 3, when all the service areas 10 need to supply heat, the heat-taking valve 19 and the heat-supplying valve 9 on the heat-supplying channel 16 in the three-medium heat exchanger 7 in all the service areas 10 are opened, and the heat-dissipating valve 21 and the cold-supplying valve 8 on the cold-supplying channel 15 in the three-medium heat exchanger 7 in all the service areas 10 are closed; the heating circulating pump 2 is started, and the cooling circulating pump 5 and the inter-area circulating pump 17 are closed; the compressor 12 is turned on.
The heat supply circulating liquid absorbs heat from the condenser 1, flows through the three-medium heat exchanger 7 under the action of the heat supply circulating pump 2, releases heat to indoor air under the action of an upper fan, and then returns to the condenser 1 to continuously absorb heat, the circulation is repeated in such a way, heat is supplied to all service areas 10, and the heat distribution among the areas is adjusted by the heat supply valves 9 corresponding to the service areas 10.
Example 3: as shown in fig. 4, when the first service area 10-1 needs to supply cold and the rest of the service areas 10 need to supply heat, the cold supply valve 8 on the cold supply channel 15 of the three medium heat exchangers 7 in the first service area 10-1 is opened, and the heat supply valve 9 on the heat supply channel 16 of the three medium heat exchangers 7 in the rest of the service areas 10 is opened; closing a heat supply valve 9 on a heat supply channel 16 in the three-medium heat exchanger 7 in the first service area 10-1, and closing a cold supply valve 8 on a cold supply channel 15 in the three-medium heat exchanger 7 in the rest service areas 10; opening the heat taking valve 19 and the heat dissipation valve 21; the heating circulating pump 2 and the cooling circulating pump 5 are opened, and the inter-area circulating pump 17 is closed; the compressor 12 is turned on.
The cooling circulation liquid releases heat to the evaporator 4, flows through the three-medium heat exchanger 7 under the action of the cooling circulation pump 5, absorbs heat from indoor air under the action of an upper fan of the three-medium heat exchanger, returns to the evaporator 4 to continuously release heat, and circularly repeats the steps in the above way to supply cold to the first service area 10-1; meanwhile, the heat supply circulating liquid absorbs heat from the condenser 1, flows through the three-medium heat exchanger 7 in the rest service areas 10 under the action of the heat supply circulating pump 2, releases heat to indoor air under the action of an upper fan, returns to the condenser 1 to continuously absorb heat, and circularly repeats the steps to supply heat to the rest service areas 10.
At this time, the cold-heat balance among the service areas 10 in the system is adjusted by the heat extraction valve 19 and the heat dissipation valve 21, namely when the cold quantity is excessive, the heat extraction device 18 supplements part of heat quantity to the area system; when the heat is excessive, the heat sink 20 removes the excessive heat to the outside of the regional system.
Example 4: as shown in fig. 5, when the first service area 10-1 needs to supply heat and the rest of the service areas 10 need to supply cold, the heat supply valve 9 on the heat supply channel 16 in the three medium heat exchangers 7 in the first service area 10-1 is opened, and the cold supply valve 8 on the cold supply channel 15 in the three medium heat exchangers 7 in the rest of the service areas 10 is opened; closing a cooling valve 8 on a cooling channel 15 in the three-medium heat exchanger 7 in the first service area 10-1, and closing a heating valve 9 on a heating channel 16 in the three-medium heat exchanger 7 in the rest service areas 10; opening the heat taking valve 19 and the heat dissipation valve 21; the heating circulating pump 2 and the cooling circulating pump 5 are opened, and the inter-area circulating pump 17 is closed; the compressor 12 is turned on.
The heat supply circulating liquid absorbs heat from the condenser 1, flows through the three-medium heat exchanger 7 under the action of the heat supply circulating pump 2, releases heat to indoor air under the action of an upper fan of the three-medium heat exchanger, returns to the condenser 1 to continuously absorb heat, and circularly repeats the steps in the above way to supply heat to the first service area 10-1; meanwhile, the cooling circulation liquid releases heat to the evaporator 4, flows through the three-medium heat exchanger 7 in the other service areas 10 under the action of the cooling circulation pump 5, absorbs heat from the indoor air under the action of an upper fan of the three-medium heat exchanger, returns to the evaporator 4 to continuously release heat, and circulates in the way to supply cold to the other service areas 10.
At this time, the cold-heat balance among the service areas 10 in the system is adjusted by the heat extraction valve 19 and the heat dissipation valve 21, namely when the cold quantity is excessive, the heat extraction device 18 supplements part of heat quantity to the area system; when the heat is excessive, the heat sink 20 removes the excessive heat to the outside of the regional system.
Example 5: as shown in fig. 6, the present embodiment employs an inter-zone circulation pump 17 to regulate heat transfer between the respective service zones 10. And (3) opening the inter-area circulating pump 17, opening the cooling valve 8 on the cooling channel 15 in the three-medium heat exchanger 7 in the first service area 10-1 and the cooling valve 8 on the cooling channel 15 in the three-medium heat exchanger 7 in the Nth service area 10-N, opening the heat taking valve 19 and the heat dissipation valve 21, closing the rest circulating pumps and valves, and closing the compressor 12.
When the first service area 10-1 needs cooling and the Nth service area 10-N needs heating, the circulating liquid absorbs heat from the first service area 10-1, is conveyed to the Nth service area 10-N to release heat under the action of the inter-area circulating pump 17, then returns to the first service area 10-1 to continue absorbing heat, and circulates; when the first service area 10-1 needs to supply heat and the Nth service area 10-N needs to supply cold, the circulating liquid releases heat to the first service area 10-1, is conveyed to the Nth service area 10-N to absorb heat under the action of the inter-area circulating pump 17, then returns to the first service area 10-1 to continue releasing heat, and the circulation is repeated.
It will be appreciated that the inter-zone circulation pump 17 may also be placed in a similar position in the heating circulation loop, operating in a similar manner to that described above. The cold and heat balance among the service areas 10 in the system can still be adjusted by the heat taking valve 19 and the heat dissipation valve 21, namely when the cold quantity is excessive, the heat taking device 18 supplements part of heat quantity to the area system; when the heat is excessive, the heat sink 20 removes the excessive heat to the outside of the regional system.
It can be known from the above description of the embodiments that the multi-zone air conditioning system of the present invention uses the three-medium heat exchanger 7 to replace the conventional air supply end of the air conditioner, and the multiple service zones 10 are connected in parallel to form a circulation loop, so as to realize frequent switching of cooling and heating conditions in any zone, and meanwhile, the system is more stable in operation, the pipeline is more simplified, the cost is further reduced, and heat recovery between different air conditioning zones can be realized.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A multi-zone air conditioning system, comprising: a heat pump unit, a plurality of three-medium heat exchangers, a heat extraction device, a heat extraction valve, a heat dissipation device and a heat dissipation valve, wherein the three-medium heat exchangers are connected in parallel with the heat pump unit, a cold supply channel in each three-medium heat exchanger is connected with an evaporator of the heat pump unit through a cold supply main liquid supply pipe and a cold supply main liquid return pipe to form a cold supply circulation loop, a heat supply channel in each three-medium heat exchanger is connected with a condenser of the heat pump unit through a heat supply main liquid supply pipe and a heat supply main liquid return pipe to form a heat supply circulation loop, a cold supply valve is arranged at an inlet or an outlet of the cold supply channel of each three-medium heat exchanger, a heat extraction valve is arranged at an inlet or an outlet of the heat extraction device, the heat dissipation device is connected between the heat supply main liquid supply pipe and the heat supply main liquid return pipe, and the heat dissipation valve is arranged at an inlet or an outlet of the heat dissipation device.
2. The multi-zone air conditioning system as claimed in claim 1, wherein a cooling circulation pump is provided in the cooling main supply pipe or the cooling main return pipe, and a heating circulation pump is provided in the heating main supply pipe or the heating main return pipe.
3. The multi-zone air conditioning system of claim 1 further comprising an inter-zone circulation pump disposed in the cooling or heating channel connected between two adjacent three medium heat exchangers.
4. The multi-zone air conditioning system of claim 1 wherein the heat extraction device is a borehole heat exchanger.
5. The multi-zone air conditioning system of claim 1 wherein the heat sink is a cooling tower.
6. The multi-zone air conditioning system of claim 1 wherein the heat extraction means and the heat dissipation means are combined into one three-medium heat exchanger and the heat extraction means and the heat dissipation means are two fluid passages of the three-medium heat exchanger, respectively.
7. A method of operating a multi-zone air conditioning system as claimed in any one of claims 1 to 6 comprising:
respectively installing each three-medium heat exchanger in a corresponding service area;
when all service areas need cooling, all cooling valves are opened, all heating valves are closed, a condenser of the heat pump unit dissipates heat into the heat dissipation device, and cooling circulation liquid supplied by an evaporator of the heat pump unit exchanges heat with the service areas through the three-medium heat exchanger for cooling;
when all service areas need to supply heat, all heat supply valves are opened, all cold supply valves are closed, an evaporator of the heat pump unit takes heat from a heat taking device, and heat supply circulating liquid supplied by a condenser of the heat pump unit exchanges heat with the service areas through a three-medium heat exchanger to supply heat;
when part of service areas need to supply heat and part of service areas need to supply cold, a heat supply valve of the service area needing to supply heat is opened, a corresponding cold supply valve is closed, and heat supply circulating liquid supplied by a condenser of the heat pump unit exchanges heat with the service areas through the three-medium heat exchanger to supply heat; opening a cold supply valve of a service area needing cold supply and closing a corresponding heat supply valve, and exchanging heat and supplying cold with the service area through a three-medium heat exchanger by cold supply circulating liquid supplied by an evaporator of a heat pump unit;
when redundant cold energy exists in the system, opening a heat-taking valve, and taking heat through a heat-taking device; when redundant heat exists in the system, the heat dissipation valve is opened, and heat dissipation is carried out through the heat dissipation device.
8. The method of operating a multi-zone air conditioning system according to claim 7 further comprising regulating the heat recovery of the three medium heat exchangers between each zone using an inter-zone circulation pump.
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| CN114562760A (en) * | 2022-02-28 | 2022-05-31 | 青岛海尔空调电子有限公司 | Air conditioning system and control method thereof |
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