CN112050305B - Multi-zone air conditioning system and method of operating the same - Google Patents
Multi-zone air conditioning system and method of operating the same Download PDFInfo
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- CN112050305B CN112050305B CN202010988585.8A CN202010988585A CN112050305B CN 112050305 B CN112050305 B CN 112050305B CN 202010988585 A CN202010988585 A CN 202010988585A CN 112050305 B CN112050305 B CN 112050305B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 116
- 239000007788 liquid Substances 0.000 claims abstract description 87
- 238000010438 heat treatment Methods 0.000 claims abstract description 65
- 230000017525 heat dissipation Effects 0.000 claims description 24
- 238000000605 extraction Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The embodiment of the invention provides a multi-zone air conditioning system and an operation method thereof. The air conditioning system includes: the heat pump unit and a plurality of three medium heat exchangers are connected in parallel to the heat pump unit, a cooling channel in each three medium heat exchanger is connected with an evaporator of the heat pump unit through a cooling total liquid supply pipe and a cooling total liquid return pipe to form a cooling circulation loop, a heating channel in each three medium heat exchanger is connected with a condenser of the heat pump unit through a heating total liquid supply pipe and a heating total liquid return pipe to form a heating circulation loop, a cooling valve is arranged at an inlet or an outlet of the cooling channel of each three medium heat exchanger, and a heating valve is arranged at an inlet or an outlet of the heating channel of each three medium heat exchanger. The multi-zone air conditioning system has a simple structure and low cost, can realize multiple operation modes, and is particularly suitable for multiple service areas with annual cold and heat 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 building air conditioning systems, there are many different cooling and heating requirements between different service areas, for example, the inner area and the outer area of a building are always required to be cooled in summer, the inner area still needs to be cooled in winter, the outer area needs to be heated in winter, and the inner area and the outer area in transitional seasons supply cooling or heating according to the requirements. In these air conditioning systems, which have frequent alternation or simultaneous cooling and heating requirements, it is often necessary to provide both cold and hot water supply lines.
As a high-efficiency air conditioning blower, air conditioning boxes and fan coils are widely used in building spaces. In the tail ends 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 tail ends of the air conditioning box are generally used in a double-pipe air conditioning system, namely winter heat supply and summer heat supply are performed in the same system, so that when some areas need heat supply and some areas need cold supply, the requirements cannot be met. The traditional fan coil and the tail end of an air conditioning box can realize the switching of the working conditions of cooling and heating through the switching of a plurality of groups of valves in an air conditioning system with cold water supply pipelines and hot water supply pipelines simultaneously, but the cooling and the heating share the same coil, so that the stable and accurate adjustment of cooling or heating is difficult to realize, the hydraulic balance is not easy to control, and certain blending 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 fan coil and an air conditioning box cooling and heating system are difficult to realize flexible and stable switching of cooling and heating working conditions, different service areas are difficult to simultaneously meet cooling and heating requirements, and the pipeline connection of a multi-water supply system is complex and has high investment.
According to a first aspect of the present invention, there is provided a multi-zone air conditioning system comprising: the heat pump unit, a plurality of three medium heat exchangers, heat abstractor and heat dissipation valve, a plurality of three medium heat exchangers connect in parallel in heat pump unit, the cooling passageway in the three medium heat exchangers is through cooling total liquid supply pipe and cooling total liquid return pipe with the evaporimeter of heat pump unit is connected in order to form the cooling circulation loop, the heat supply passageway in the three medium heat exchangers is through heating total liquid supply pipe and heating total liquid return pipe with the condenser of heat pump unit is connected in order to form the heating circulation loop, in every three medium heat exchanger the entry or the export of cooling passageway is equipped with the heat supply valve, in every three medium heat exchanger the entry or the export of heat supply passageway is equipped with the heat supply valve, the heat abstractor connect in between the cooling total liquid supply pipe with the entry or the export of heat abstractor, heat abstractor connect in between the heating total liquid supply pipe and the heat abstractor.
The cooling circulation pump is arranged on the cooling total liquid supply pipe or the cooling total liquid return pipe, and the heating circulation pump is arranged on the heating total liquid supply pipe or the heating total liquid return pipe.
The heat exchanger further comprises an inter-area circulating pump, wherein the inter-area circulating pump is arranged on the cooling channel or the heating channel connected between two adjacent three-medium heat exchangers.
Wherein the heat-taking device is a buried pipe heat exchanger.
Wherein, heat abstractor is the 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 respectively two liquid channels of the three-medium heat exchanger.
According to another aspect of the embodiment of the present invention, there is provided a method for operating the multi-zone air conditioning system according to the first aspect of the embodiment of the present invention, including:
each three-medium heat exchanger is respectively installed in a corresponding service area;
when all service areas need to be cooled, all cooling valves are opened, all heating valves are closed, a condenser of the heat pump unit dissipates heat to a heat dissipation device, and cooling circulating liquid supplied by an evaporator of the heat pump unit exchanges heat with the service areas through a three-medium heat exchanger to cool;
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 the 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 a part of service areas need to supply heat and a part of service areas need to supply cold, a heat supply valve of the service areas needing to supply heat is opened, a corresponding cold supply valve is closed, and heat supply circulating liquid supplied by a condenser of a heat pump unit exchanges heat with the service areas through a three-medium heat exchanger to supply heat; opening a cooling valve of a service area needing cooling and closing a corresponding heating valve, and exchanging heat and cooling with the service area through a three-medium heat exchanger by using cooling circulating liquid supplied by an evaporator of a heat pump unit;
when redundant cold exists in the system, a heat-taking valve is opened, and heat is taken through a heat-taking device; when redundant heat exists in the system, the heat dissipation valve is opened, and heat dissipation is performed 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, cold and hot circulating liquid is provided for the three-medium heat exchanger through the heat pump unit to supply cold and heat to the indoor, the tail end of the same three-medium heat exchanger simultaneously comprises a cold supply pipeline and a heat supply pipeline, the two mediums are ensured not to be mixed, the on-off and flow of the cold and hot mediums can be controlled through adjusting the cold supply valve and the heat supply valve for different service areas, thereby meeting the cooling and heating requirements of different service areas, and the adjustment of heat supply strategies and the cooling strategy is flexible. 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 areas with annual cold and heat demands.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
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 view showing the structure of embodiment 4 of the present invention;
fig. 6 is a schematic structural view of embodiment 5 of the present invention.
Reference numerals:
1: a condenser; 2: a heat supply circulation pump; 3: a heat supply total liquid supply pipe; 4: an evaporator; 5: a cooling circulation pump; 6: a cooling total liquid supply pipe; 7: a three medium heat exchanger; 8: a cooling valve; 9: a heating valve; 10: a service area; 10-1: a first service area; 10-N: an nth service area; 11: a heat supply total liquid return pipe; 12: a compressor; 13: a throttle device; 14: a cooling total liquid return pipe; 15: a cooling channel; 16: a heating channel; 17: an inter-zone circulation pump; 18: a heat extraction device; 19: a heat-taking valve; 20: a heat sink; 21: a heat dissipation valve.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; the mechanical connection can be realized, and the point connection can be realized; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
A multi-zone air conditioning system according to an embodiment of the present invention is described below with reference to fig. 1 to 6, including: the heat pump unit, a plurality of three medium heat exchangers 7, heat abstractor 18, heat abstractor 19, heat abstractor 20 and heat abstractor 21, a plurality of three medium heat exchangers 7 are connected in parallel to the heat pump unit, the cooling channel 15 in the three medium heat exchangers 7 is connected with the evaporator of the heat pump unit through the cooling total liquid supply pipe 6 and the cooling total liquid return pipe 14 so as to form a cooling circulation loop, the heating channel 16 in the three medium heat exchangers 7 is connected with the condenser of the heat pump unit through the heating total liquid supply pipe 3 and the heating total liquid return pipe 11 so as to form a heating circulation loop, the inlet or the outlet of the cooling channel 15 of each three medium heat exchanger 7 is provided with the cooling valve 8, the heat abstractor 18 is connected between the cooling total liquid supply pipe 6 and the cooling total liquid return pipe 14, the heat abstractor 19 is arranged at the inlet or the outlet of the heat abstractor 18, the heat abstractor 20 is connected between the heating total liquid supply pipe 3 and the heating total liquid return pipe 11, and the heat abstractor 21 is arranged at the inlet or the outlet of the heat abstractor 20.
Specifically, in this embodiment, the three-medium heat exchanger 7 is used to replace the conventional air-conditioning air supply terminal (the air outlet terminal such as an indoor fan coil) and is 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 respectively used to connect to the condenser 1 and the evaporator 4 of the heat pump, where the condenser 1 and the evaporator 4 in the heat pump unit respectively supply circulating liquids with different temperatures, and the air exchanges heat with the circulating liquids under the action of the fans of the three-medium heat exchanger 7, so as to cool or heat 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 colder or hotter circulating liquid.
The cooling channel 15 in the three-medium heat exchanger 7 is connected with the evaporator 4 of the heat pump unit through the cooling total liquid supply pipe 6 and the cooling total liquid return pipe 14 to form a cooling circulation loop, and circulating liquid serving as cooling effect moves in the cooling circulation loop in a directional manner so as to convey cold quantity; 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 total liquid supply pipe 3 and the heat supply total liquid return pipe 11 to form a heat supply circulation loop, and circulating liquid serving as heat supply effect moves directionally in the heat supply circulation loop to convey heat.
A cooling valve 8 is arranged at the inlet or outlet of the cooling channel 15 of each three-medium heat exchanger 7, a heating valve 9 is arranged at the inlet or outlet of the heating channel 16 of each three-medium heat exchanger 7, the on-off and flow rate of circulating liquid can be regulated, and specifically, when the service area 10 needs cooling, only the cooling valve 8 corresponding to the service area 10 is opened; when the service area 10 requires heat supply, only the heat supply valve 9 corresponding to the service area 10 is opened. Since the cooling valve 8 and the heating valve 9 are provided at each three-medium heat exchanger 7, the cooling or heating amount of the service area 10 can be further controlled by adjusting the opening degrees of the cooling valve 8 and the heating valve 9.
The 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 the 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 providing heat dissipation circulating liquid for the condenser 1, discharging excessive heat in the system, adjusting the cold-heat balance of the system, and the heat dissipation valve 21 can be used for controlling the flow of the heat dissipation circulating liquid. When redundant cold exists in the system, a heat-taking valve 19 is opened, and heat is taken through a heat-taking device 18; when excessive heat exists in the system, the heat dissipation valve 21 is opened, and heat dissipation is performed through the heat dissipation device 20
According to the multi-zone air conditioning system and the operation method thereof provided by the embodiment of the invention, the three-medium heat exchanger 7 is adopted to replace an indoor fan coil or an air conditioning box in the prior art, cold and heat mediums are provided for the three-medium heat exchanger 7 through the heat pump unit so as to supply cold and heat to the indoor, the tail end of the same three-medium heat exchanger 7 simultaneously comprises the cold supply channel 15 and the heat supply channel 16, the two mediums are not mixed, the on-off and flow of the cold and heat mediums can be controlled through adjusting the cold supply valve 8 and the heat supply valve 9 for different service areas 10, so that the cooling and heating requirements of different service areas 10 are met, and the adjustment of the heat supply strategy and the cooling strategy is flexible. The multi-zone air conditioning system of the embodiment of the invention has simple structure and low cost, can realize various operation modes, and is particularly suitable for a plurality of service areas 10 with annual cold and heat demands.
In one embodiment, the cooling circulation pump 5 is provided in the cooling total liquid supply pipe 6 or the cooling total liquid return pipe 14, and the heating circulation pump 2 is provided in the heating total liquid supply pipe 3 or the heating total liquid return pipe 11. In the present embodiment, the circulation liquid in the cooling circulation loop is allowed to flow in a directional circulation manner by the cooling circulation pump 5, and the circulation liquid in the heating circulation loop is allowed to flow in a directional circulation manner by the heating circulation pump 2.
In one embodiment, the heat pump unit comprises a compressor 12, a condenser 1, a throttle device 13 and an evaporator 4 connected in this order.
The cooling channel 15 in the three-medium heat exchanger 7 is connected with the evaporator 4 through the cooling total liquid supply pipe 6 and the cooling total liquid return pipe 14 to form a cooling circulation loop, so that cooling circulation liquid in the evaporator 4 enters the three-medium heat exchanger 7, absorbs heat from indoor air under the action of a fan on the cooling circulation liquid, returns to the evaporator 4 to release heat, and circulates in this way to cool 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 total liquid supply pipe 3 and the heat supply total liquid return pipe 11 to form a heat supply circulation loop, so that 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, returns to the condenser 1 to absorb heat, and circulates in this way to supply heat to the service area 10.
In one embodiment, as shown in fig. 6, the multi-zone air conditioning system of the present embodiment further includes an inter-zone circulation pump 17, and the inter-zone circulation pump 17 is disposed in the cooling channel 15 or the heating channel 16 connected between any two three-medium heat exchangers 7. In this embodiment, the circulating fluid can be directed to flow 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 device such as a borehole heat exchanger.
In one embodiment, the heat sink 20 may be a heat sink such as a cooling tower.
In one embodiment, the heat-extracting device 18 and the heat-dissipating device 20 are combined into a three-medium heat exchanger, and the heat-extracting device 18 and the heat-dissipating 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:
each three-medium heat exchanger 7 is respectively installed in a corresponding service area 10;
1. When all the service areas 10 need to be cooled, all the cooling valves 8 are opened, all the heating valves 9 are closed, the condenser 1 of the heat pump unit radiates heat into the heat radiating device 20, and the cooling circulating 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 to cool.
2. When all service areas 10 need to supply heat, 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 the 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 the partial service area 10 needs to supply heat and the partial service area 10 needs to supply cold, a heat supply valve 9 of the partial service area 10 needs to supply heat is opened, a corresponding cold supply valve 8 is closed, and heat supply circulating liquid supplied by the heat pump unit condenser 1 exchanges heat with the service area 10 through the three-medium heat exchanger 7 to supply heat; the cooling valve 8 of the cooling service area 10 is opened, the corresponding heating valve 9 is closed, and the cooling circulating liquid supplied by the evaporator 4 of the heat pump unit exchanges heat with the service area 10 through the three-medium heat exchanger 7 for cooling.
When redundant cold exists in the system, a heat-taking valve 19 is opened, and heat is taken through a heat-taking device 18; when excessive heat exists in the system, the heat dissipation valve 21 is opened, and heat dissipation is performed through the heat dissipation device 20.
In one embodiment, the method further comprises regulating heat recovery of the three-medium heat exchanger between each zone using the inter-zone circulation pump, the specific heat recovery method being as described in example 5.
Specifically, the operation method of this embodiment is described by the following four embodiments:
example 1: as shown in fig. 2, when all service areas 10 need to be cooled, the heat dissipation valve 21 and the cooling valve 8 on the cooling channel 15 in the three-medium heat exchanger 7 in all service areas 10 are opened, and the heat extraction valve 19 and the heat supply valve 9 on the heat supply channel 16 in the three-medium heat exchanger 7 in all service areas 10 are closed; starting the cooling circulation pump 5, and closing the heating circulation pump 2 and the inter-region circulation pump 17; the compressor 12 is turned on.
The cooling circulation liquid releases heat into 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 the fan, returns to the evaporator 4 for continuously releasing heat, and circulates in this way to supply cold for all the service areas 10, and the cold distribution among the areas is regulated by the cold supply valves 8 corresponding to the service areas 10.
Example 2: as shown in fig. 3, when all 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 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 service areas 10 are closed; starting the heat supply circulating pump 2, and closing the cooling circulating pump 5 and the inter-region circulating pump 17; 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 the fan, returns to the condenser 1 to continuously absorb heat, and thus circulates and reciprocates to supply heat to all the service areas 10, and the heat distribution among the areas is regulated 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 cooling and the remaining service areas 10 need heating, the cooling valve 8 on the cooling channel 15 in the three-medium heat exchanger 7 in the first service area 10-1 is opened, and the heating valve 9 on the heating channel 16 in the three-medium heat exchanger 7 in the remaining service areas 10 is opened; closing the heat supply valve 9 on the heat supply channel 16 in the three-medium heat exchanger 7 in the first service area 10-1, and simultaneously closing the cooling valve 8 on the cooling channel 15 in the three-medium heat exchanger 7 in the rest of the service area 10; opening the heat taking valve 19 and the heat radiating valve 21; the heat supply circulating pump 2 and the cold supply circulating pump 5 are turned on, and the inter-region circulating pump 17 is turned off; the compressor 12 is turned on.
The cooling circulation liquid releases heat into 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 the upper fan, returns to the evaporator 4 for continuous heat release, and circulates in this way to cool the first service area 10-1; at the same time, the heat-supply circulating liquid absorbs heat from the condenser 1, flows through the three-medium heat exchanger 7 in the rest of the service areas 10 under the action of the heat-supply circulating pump 2, releases heat to indoor air under the action of the upper fan, and returns to the condenser 1 to continuously absorb heat, so that the heat is circularly recovered to supply heat for the rest of the service areas 10.
At this time, the cold-heat balance between the service areas 10 in the system is adjusted by the heat-taking valve 19 and the heat-dissipating valve 21, that is, when the cold quantity is too much, part of the heat is supplemented into the area system by the heat-taking device 18; 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 exchanger 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 exchanger 7 in the rest of the service areas 10 is opened; closing the cold supply valve 8 on the cold supply channel 15 in the three-medium heat exchanger 7 in the first service area 10-1, and simultaneously closing the heat supply valve 9 on the heat supply channel 16 in the three-medium heat exchanger 7 in the rest service area 10; opening the heat taking valve 19 and the heat radiating valve 21; the heat supply circulating pump 2 and the cold supply circulating pump 5 are turned on, and the inter-region circulating pump 17 is turned off; 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 the upper fan, returns to the condenser 1 to continuously absorb heat, and circulates in this way to supply heat to the first service area 10-1; at the same time, the cooling circulation liquid releases heat into the evaporator 4, flows through the three-medium heat exchanger 7 in the rest of the service areas 10 under the action of the cooling circulation pump 5, absorbs heat from indoor air under the action of the fan, returns to the evaporator 4 again for continuous heat release, and circulates in this way to cool the other service areas 10.
At this time, the cold-heat balance between the service areas 10 in the system is adjusted by the heat-taking valve 19 and the heat-dissipating valve 21, that is, when the cold quantity is too much, part of the heat is supplemented into the area system by the heat-taking device 18; 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 individual service zones 10. The inter-area circulating pump 17 is opened, the cold supply valve 8 on the cold supply channel 15 in the three-medium heat exchanger 7 in the first service area 10-1 and the cold supply valve 8 on the cold supply channel 15 in the three-medium heat exchanger 7 in the N service area 10-N are opened, the heat taking valve 19 and the heat radiating valve 21 are opened, the rest circulating pumps and valves are closed, and the compressor 12 is closed.
When the first service area 10-1 needs cooling and the N service area 10-N needs heating, circulating liquid absorbs heat from the first service area 10-1, is conveyed to the N 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 continuously absorb heat, and repeats circularly; 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 into 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, and then returns to the first service area 10-1 to continuously release heat, and is circulated and reciprocated.
It will be appreciated that the inter-zone circulation pump 17 may also be located in a similar location in the heating circulation loop, in a similar manner to that described above. The heat and cold balance between the service areas 10 in the system can be still regulated by the heat-taking valve 19 and the heat-dissipating valve 21, namely, when the cooling capacity is excessive, part of heat is supplemented into the area system by the heat-taking device 18; when the heat is excessive, the heat sink 20 removes the excessive heat to the outside of the regional system.
As can be seen from the description of the above embodiments, the multi-zone air conditioning system of the present invention adopts the three-medium heat exchanger 7 to replace the conventional air supply end of the air conditioner, and the multi-service zone 10 is 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 operation is more stable, 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 embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A multi-zone air conditioning system, comprising: the heat pump unit, a plurality of three medium heat exchangers, heat abstractor and heat dissipation valve, a plurality of three medium heat exchangers connect in parallel in heat pump unit, the cooling passageway in the three medium heat exchangers is through cooling total liquid supply pipe and cooling total liquid return pipe with the evaporimeter of heat pump unit is connected in order to form the cooling circulation loop, the heat supply passageway in the three medium heat exchangers is through heating total liquid supply pipe and heating total liquid return pipe with the condenser of heat pump unit is connected in order to form the heating circulation loop, in every three medium heat exchanger the entry or the export of cooling passageway is equipped with the heat supply valve, in every three medium heat exchanger the entry or the export of heat supply passageway is equipped with the heat supply valve, the heat abstractor connect in between the cooling total liquid supply pipe with the entry or the export of heat abstractor, heat abstractor connect in between the heating total liquid supply pipe and the heat abstractor.
2. The multi-zone air conditioning system according to claim 1, wherein a cooling circulation pump is provided in the cooling total liquid supply pipe or the cooling total liquid return pipe, and a heating circulation pump is provided in the heating total liquid supply pipe or the heating total liquid return pipe.
3. The multi-zone air conditioning system of claim 1, further comprising an inter-zone circulation pump disposed at the cooling or heating channels 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 buried pipe 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 device and the heat dissipation device are combined into one three-medium heat exchanger, and the heat extraction device and the heat dissipation device are two liquid channels of the three-medium heat exchanger, respectively.
7. A method of operating a multi-zone air conditioning system according to any of claims 1-6, comprising:
each three-medium heat exchanger is respectively installed in a corresponding service area;
when all service areas need to be cooled, all cooling valves are opened, all heating valves are closed, a condenser of the heat pump unit dissipates heat to a heat dissipation device, and cooling circulating liquid supplied by an evaporator of the heat pump unit exchanges heat with the service areas through a three-medium heat exchanger to cool;
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 the 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 a part of service areas need to supply heat and a part of service areas need to supply cold, a heat supply valve of the service areas needing to supply heat is opened, a corresponding cold supply valve is closed, and heat supply circulating liquid supplied by a condenser of a heat pump unit exchanges heat with the service areas through a three-medium heat exchanger to supply heat; opening a cooling valve of a service area needing cooling and closing a corresponding heating valve, and exchanging heat and cooling with the service area through a three-medium heat exchanger by using cooling circulating liquid supplied by an evaporator of a heat pump unit;
when redundant cold exists in the system, a heat-taking valve is opened, and heat is taken through a heat-taking device; when redundant heat exists in the system, the heat dissipation valve is opened, and heat dissipation is performed through the heat dissipation device.
8. The method of operating a multi-zone air conditioning system of claim 7, further comprising regulating heat recovery of the three-medium heat exchanger between each zone using an inter-zone circulation pump.
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