CN113483504A - Soil source heat pump and cooling tower combined system and optimization control method of combined system - Google Patents
Soil source heat pump and cooling tower combined system and optimization control method of combined system Download PDFInfo
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- CN113483504A CN113483504A CN202110762709.5A CN202110762709A CN113483504A CN 113483504 A CN113483504 A CN 113483504A CN 202110762709 A CN202110762709 A CN 202110762709A CN 113483504 A CN113483504 A CN 113483504A
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- 238000001816 cooling Methods 0.000 title claims abstract description 77
- 239000002689 soil Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims description 20
- 238000005457 optimization Methods 0.000 title claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 172
- 239000002131 composite material Substances 0.000 claims abstract description 20
- 239000000498 cooling water Substances 0.000 claims description 17
- 230000007613 environmental effect Effects 0.000 claims description 7
- 238000005094 computer simulation Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000009191 jumping Effects 0.000 claims description 3
- 238000005057 refrigeration Methods 0.000 claims description 2
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 230000017525 heat dissipation Effects 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000004088 simulation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
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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
- F25B30/06—Heat pumps characterised by the source of low potential heat
-
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
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- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a soil source heat pump and cooling tower composite system, which sequentially comprises a buried pipe, a heat pump unit, a fan coil, a water chilling unit and a cooling tower according to the pipeline circulation sequence; the device also comprises a controller. The invention introduces the refrigerating unit as an auxiliary cold source, the cooling tower as an auxiliary heat dissipation source, the buried pipe and the heat pump unit can intermittently operate, and the recovery of the soil temperature is facilitated; through the annual simulation of the system, the start-stop temperature of the cooling tower is set, the soil temperature interval of the high-efficiency operation of the heat pump unit is determined, the cooling tower and the heat pump unit are ensured to operate at high efficiency all the time, and the operation energy efficiency of the system can be improved; the soil heat balance all year round is maintained, the problems that when the soil source heat pump is used in areas with hot summer, cold winter and warm summer, the cold load in summer is far larger than the heat load in winter, the heat gain of the soil is larger than the heat discharge amount, and the soil temperature is increased year by year are solved, and the high efficiency and the energy conservation of the system operation are ensured.
Description
Technical Field
The invention belongs to the technical field of ground source heat pump air conditioners, and particularly relates to a soil source heat pump and cooling tower combined system and an optimization control method of the combined system.
Background
In recent years, the soil source heat pump can achieve the purposes of energy conservation and emission reduction by using geothermal which is a renewable energy source, is efficient and environment-friendly, and is widely researched and applied at home and abroad. However, when the soil source heat pump is used in areas with cold summer and warm summer and winter, the heat gain of the soil is larger than the heat removal amount due to the fact that the cold load in summer is far larger than the heat load in winter, the soil temperature rises year by year, and the performance of the heat pump is seriously affected, namely the soil heat imbalance phenomenon.
A water chilling unit and a cooling tower are added into the ground source heat pump system, the two systems can be operated simultaneously to supply cold indoors in summer, and the ground source heat pump system can be used only to supply heat indoors in winter. The composite system can reduce the heat gain of the soil and better solve the problem of soil heat imbalance.
For this system, a common control scheme for cooling towers is to start and stop at fixed times. However, the control scheme cannot ensure that the cooling tower is always in an efficient operation state, and cannot accurately control the heat balance of heat extraction and release to soil all the year round. And with the rise of the soil temperature, the condensation temperature rises, and the refrigerating capacity of the heat pump unit is reduced. In addition, load distribution and control of the heat pump units and the cold water units are also a problem when the summer system is operated.
For the control problem of the ground source heat pump composite system of the buried pipe and the cooling tower, some patents have been issued, for example, the application number CN201210367360.6 is named as the control system and method of the ground source heat pump composite system of the buried pipe and the cooling tower. According to the ground source heat pump composite system, the difference between the temperature of fluid at the outlet of a heat pump condenser and the temperature of an atmospheric wet bulb is used as a main control variable, the temperature of fluid at the inlet of the heat pump condenser is used as an auxiliary control variable, the cooling tower is optimally controlled to start and stop, the cooling tower is matched with a ground heat exchanger to realize the energy-saving operation of the ground source heat pump composite system, and the annual cold and heat load balance of the underground environment is ensured.
The application number CN201610345505.0 is an invention patent of a ground source heat pump system and a start-stop control method of a cooling tower. According to the difference between the water inlet temperature of the ground source side main machine and the outdoor air wet bulb temperature, the cooling tower, the buried pipe and the ground source heat pump main machine are controlled to be opened and closed. The control method can keep the soil temperature almost unchanged after the system operates, and ensures the high efficiency and the energy saving performance of the operation of the ground source heat pump system.
The control variables of the two control methods are more, only the cooling tower serving as auxiliary cooling equipment is used, and a water chilling unit serving as an auxiliary cold source is not introduced, so that the control method is different from the composite system structure and the operation mode in the application. The control method can dynamically simulate the system all year round to obtain the soil temperature when the energy efficiency of the heat pump unit is in a high level, and the start-stop temperature of the cooling tower is continuously adjusted to improve the energy efficiency.
Therefore, it is an urgent need for those skilled in the art to develop a system and a control method for maintaining energy efficiency and soil heat balance.
Disclosure of Invention
In order to solve the problems, the invention discloses a soil source heat pump and cooling tower combined system and an optimization control method of the combined system.
In order to achieve the purpose, the invention provides the following technical scheme:
a soil source heat pump and cooling tower composite system comprises a buried pipe, a heat pump unit, a fan coil, a water chilling unit and a cooling tower in sequence according to the circulation sequence of pipelines; the device also comprises a controller;
a ground source side inlet of the heat pump unit is connected with the buried pipe through a ground source side circulating water pump, a ground source side outlet of the heat pump unit returns to the buried pipe through a pipeline, and a cooling side outlet of the heat pump unit sequentially passes through the chilled water circulating water pump and the fan coil inflow valve and flows into the fan coil;
the outlet of the fan coil is communicated to the coil side inlet of the cold water unit and the cooling side inlet of the heat pump unit through the fan coil outflow valve;
the outlet of the coil side of the water chilling unit returns to the fan coil through a pipeline, the outlet of the cooling side of the water chilling unit is connected with the inlet of the cooling tower through a cooling water circulating pump, and the outlet of the cooling tower also returns to the inlet of the cooling side of the water chilling unit through a pipeline;
the controller is respectively connected with the ground source side circulating water pump, the heat pump unit, the chilled water circulating water pump, the fan coil, the cooling tower, the water chilling unit and the cooling water circulating water pump.
Further, the device also comprises a water tank; the outlet of the water tank is communicated with the buried pipe through a pipeline.
Further, a coil side outlet of the water chilling unit returns to a pipeline between the chilled water circulating water pump and the fan coil inflow valve through a pipeline.
Furthermore, a chilled water circulating water pump of the water chilling unit is arranged at the outlet of the coil pipe side of the water chilling unit.
Further, the optimization control method of the composite system comprises the following steps:
performing annual dynamic simulation through environmental working conditions to obtain a soil temperature interval for efficient operation of a heat pump unit; the heat pump unit enters the soil temperature range by adjusting the temperature of an environment wet bulb for controlling the start and stop of the cooling tower; and the heat balance of the soil is kept by changing the control temperature.
Further, the optimization control method of the composite system comprises the following specific steps:
step 2, opening a fan coil according to the refrigeration or heating requirements, and controlling the start and stop of a heat pump unit, a chilled water circulating water pump, a cooling tower, a water chilling unit, a cooling water circulating water pump and a chilled water circulating water pump of the water chilling unit through a controller;
and 3, adjusting the starting and stopping temperature of the cooling tower through a controller to ensure the soil heat balance.
Further, the specific method of step 2 is as follows:
(2-1) when the soil source heat pump and cooling tower composite system has the function of heating, starting a ground source side circulating water pump, a heat pump unit, a chilled water circulating water pump and a fan coil, and not starting a cooling tower, a water chilling unit, a chilled water circulating water pump of the water chilling unit and a cooling water circulating water pump, and finishing the step 2; otherwise skip (2-2)
(2-2) setting the starting and stopping temperature of the cooling tower to be T1 through the controller, starting the fan coil, starting the water chilling unit, the chilled water circulating water pump of the water chilling unit and the cooling water circulating water pump when the environment wet bulb temperature is less than T1, and entering (2-3), otherwise, starting the heat pump unit, the ground source side circulating water pump and the chilled water circulating water pump, and jumping to (2-4).
(2-3) when the water chilling unit cannot meet the end load requirement, starting the heat pump unit, the ground source side circulating water pump and the chilled water circulating water pump, and finishing the step 2.
(2-4) when the heat pump unit cannot meet the load requirement of the tail end, starting the water chilling unit, the chilled water circulating water pump of the water chilling unit and the cooling water circulating water pump, and finishing the step 2.
Further, the environmental conditions include load characteristics of the building, meteorological parameters, and operating parameters of the system.
Compared with the prior art, the invention has the following beneficial effects:
1. a refrigerating unit is introduced to serve as an auxiliary cold source, a cooling tower serves as an auxiliary heat dissipation source, and the buried pipe and the heat pump unit can intermittently operate, so that the recovery of the soil temperature is facilitated;
2. through the annual simulation of the system, the start-stop temperature of the cooling tower is set, the soil temperature interval of the high-efficiency operation of the heat pump unit is determined, the cooling tower and the heat pump unit are ensured to operate at high efficiency all the time, and the operation energy efficiency of the system can be improved;
3. the soil heat balance all year round is maintained, the problems that when the soil source heat pump is used in areas with hot summer, cold winter and warm summer, the cold load in summer is far larger than the heat load in winter, the heat gain of the soil is larger than the heat discharge amount, and the soil temperature is increased year by year are solved, and the high efficiency and the energy conservation of the system operation are ensured.
Drawings
FIG. 1 is a schematic diagram of the structure of the composite system of the present invention;
FIG. 2 is a flow chart of an optimization control method of the composite system of the present invention.
List of reference numerals: the system comprises a buried pipe 1, a heat pump unit 2, a fan coil 3, a water chilling unit 4, a cooling tower 5, a controller 6, a ground source side circulating water pump 7, a chilled water circulating water pump 8, a fan coil inflow valve 9, a fan coil outflow valve 10, a chilled water circulating water pump 11, a chilled water unit chilled water circulating water pump 12 and a water tank 13.
Detailed Description
The technical solutions provided by the present invention will be described in detail below with reference to specific examples, and it should be understood that the following specific embodiments are only illustrative of the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, the present invention is a schematic structural diagram of a composite system, and the present invention sequentially includes a buried pipe 1, a heat pump unit 2, a fan coil 3, a water chiller 4 and a cooling tower 5 according to a pipeline circulation sequence.
A ground source side inlet of the heat pump unit 2 is connected with the buried pipe 1 through a ground source side circulating water pump 7, a ground source side outlet of the heat pump unit 2 returns to the buried pipe 1 through a pipeline, and a cooling side outlet of the heat pump unit 2 sequentially passes through a chilled water circulating water pump 8 and a fan coil inflow valve 9 and flows into a fan coil 3; the outlet of the fan coil 3 is communicated to the coil side inlet of the cold water unit 4 and the cooling side inlet of the heat pump unit 2 through a fan coil outflow valve 10; the outlet of the coil side of the water chilling unit 4 returns to the fan coil 3 through a pipeline, the outlet of the cooling side of the water chilling unit 4 is connected with the inlet of the cooling tower 5 through a cooling water circulating water pump 11, and the outlet of the cooling tower 5 also returns to the inlet of the cooling side of the water chilling unit 4 through a pipeline; the outlet of the coil side of the water chilling unit 4 returns to the pipeline between the chilled water circulating water pump 8 and the fan coil inflow valve 9 through the pipeline, and the chilled water circulating water pump 12 of the water chilling unit is installed at the outlet of the coil side of the water chilling unit 4.
Also comprises a controller 6; the controller 6 is respectively connected with the ground source side circulating water pump 7, the heat pump unit 2, the chilled water circulating water pump 8, the fan coil 3, the cooling tower 5, the water chilling unit 4 and the cooling water circulating water pump 11.
Also comprises a water tank 13; the outlet of the water tank 13 is communicated with the buried pipe 1 through a pipeline.
The optimization control method of the composite system comprises the following steps:
performing annual dynamic simulation through environmental working conditions to obtain a soil temperature interval for efficient operation of a heat pump unit; the heat pump unit enters the soil temperature range by adjusting the temperature of an environment wet bulb for controlling the start and stop of the cooling tower; and the heat balance of the soil is kept by changing the control temperature.
As shown in fig. 2, the specific method for optimizing and controlling the composite system is as follows:
temperature sensors are respectively arranged at the inlet and the outlet of the buried pipe 1, the heat pump unit 2, the water chilling unit 4 and the cooling tower 5. Flow sensors are arranged at the outlets of the buried pipe 1 and the cooling tower 5, and a humidity thermometer is arranged at the local place
step (2-1), when the soil source heat pump and cooling tower composite system has the function of heating, starting a ground source side circulating water pump 7, a heat pump unit 2, a chilled water circulating water pump 8 and a fan coil 3, and ending the step 2 without starting a cooling tower 5, a water chilling unit 4, a chilled water circulating water pump 12 and a cooling water circulating water pump 11; otherwise skip (2-2)
And (2-2) setting the starting and stopping temperature of the cooling tower to be T1 through the controller 3, starting the fan coil 3, starting the water chilling unit 4, the chilled water circulating water pump 12 of the water chilling unit and the cooling water circulating water pump 11 when the environment wet bulb temperature Ta is less than T1, entering (2-3), and otherwise, starting the heat pump unit 2, the ground source side circulating water pump 7 and the chilled water circulating water pump 8 and jumping to (2-4).
And (2-3) when the water chilling unit 4 cannot meet the end load requirement, starting the heat pump unit 2, the ground source side circulating water pump 7 and the chilled water circulating water pump 8, and finishing the step 2.
And (2-4) when the heat pump unit 2 cannot meet the load requirement of the tail end, starting the water chilling unit 4, the chilled water circulating water pump 12 of the water chilling unit and the cooling water circulating water pump 11, and finishing the step 2.
And 3, adjusting the starting and stopping temperature of the cooling tower 5 through the controller 6 to ensure the soil heat balance.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all the modifications and equivalent substitutions should be covered by the claims of the present invention.
Claims (8)
1. The soil source heat pump and cooling tower combined system is characterized in that: the system comprises a buried pipe, a heat pump unit, a fan coil, a water chilling unit and a cooling tower in sequence according to the circulation sequence of pipelines; the device also comprises a controller;
a ground source side inlet of the heat pump unit is connected with the buried pipe through a ground source side circulating water pump, a ground source side outlet of the heat pump unit returns to the buried pipe through a pipeline, and a cooling side outlet of the heat pump unit sequentially passes through the chilled water circulating water pump and the fan coil to flow into the fan coil through a valve;
the outlet of the fan coil is communicated to the coil side inlet of the water chilling unit and the cooling side inlet of the heat pump unit through the fan coil outflow valve;
the outlet of the coil side of the water chilling unit returns to the fan coil through a pipeline, the outlet of the cooling side of the water chilling unit is connected with the inlet of the cooling tower through a cooling water circulating water pump, and the outlet of the cooling tower also returns to the inlet of the cooling side of the water chilling unit through a pipeline;
the controller is respectively connected with the ground source side circulating water pump, the heat pump unit, the chilled water circulating water pump, the fan coil, the cooling tower, the water chilling unit and the cooling water circulating water pump.
2. The soil source heat pump and cooling tower combined system as claimed in claim 1, wherein: the device also comprises a water tank; and the outlet of the water tank is communicated with the buried pipe through a pipeline.
3. The soil source heat pump and cooling tower combined system as claimed in claim 2, wherein: and the outlet at the coil side of the water chilling unit returns to a pipeline between the chilled water circulating water pump and the fan coil inflow valve through a pipeline.
4. The soil source heat pump and cooling tower combined system as claimed in claim 3, wherein: and a chilled water circulating water pump of the water chilling unit is arranged at the outlet of the coil pipe side of the water chilling unit.
5. The soil source heat pump and cooling tower combined system as claimed in claim 4, wherein: the optimization control method of the composite system comprises the following steps:
performing annual dynamic simulation through environmental working conditions to obtain a soil temperature interval for efficient operation of a heat pump unit; the heat pump unit enters the soil temperature range by adjusting the temperature of an environment wet bulb for controlling the start and stop of the cooling tower; and the heat balance of the soil is kept by changing the control temperature.
6. The soil source heat pump and cooling tower combined system as claimed in claim 5, wherein: the optimization control method of the composite system comprises the following specific steps:
step 1, performing annual dynamic simulation through environmental working conditions to obtain a soil temperature interval when the energy efficiency of a heat pump unit is in high-level heat;
step 2, opening a fan coil according to the refrigeration or heating requirements, and controlling the start and stop of a heat pump unit, a chilled water circulating water pump, a cooling tower, a water chilling unit, a cooling water circulating water pump and a chilled water circulating water pump of the water chilling unit through a controller;
and 3, adjusting the starting and stopping temperature of the cooling tower through a controller to ensure the soil heat balance.
7. The soil source heat pump and cooling tower combined system as claimed in claim 6, wherein: the specific method of the step 2 is as follows:
(2-1) when the soil source heat pump and cooling tower composite system has the function of heating, starting a ground source side circulating water pump, a heat pump unit, a chilled water circulating water pump and a fan coil, and not starting a cooling tower, a water chilling unit, a chilled water circulating water pump of the water chilling unit and a cooling water circulating water pump, and finishing the step 2; otherwise skip (2-2)
(2-2) setting the starting and stopping temperature of the cooling tower to be T1 through a controller, starting a fan coil, starting a water chilling unit, a chilled water circulating water pump of the water chilling unit and a cooling water circulating water pump when the environment wet bulb temperature is less than T1, and entering (2-3), otherwise, starting the heat pump unit, a ground source side circulating water pump and the chilled water circulating water pump, and jumping (2-4);
(2-3) when the water chilling unit cannot meet the end load requirement, starting the heat pump unit, the ground source side circulating water pump and the chilled water circulating water pump, and finishing the step 2;
(2-4) when the heat pump unit cannot meet the load requirement of the tail end, starting the water chilling unit, the chilled water circulating water pump of the water chilling unit and the cooling water circulating water pump, and finishing the step 2.
8. The soil source heat pump and cooling tower combined system as claimed in claim 6, wherein: the environmental conditions include load characteristics of the building, meteorological parameters, and operating parameters of the system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110762709.5A CN113483504A (en) | 2021-07-06 | 2021-07-06 | Soil source heat pump and cooling tower combined system and optimization control method of combined system |
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| CN202110762709.5A CN113483504A (en) | 2021-07-06 | 2021-07-06 | Soil source heat pump and cooling tower combined system and optimization control method of combined system |
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Cited By (2)
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| CN116857863A (en) * | 2023-07-07 | 2023-10-10 | 淮北矿业(集团)有限责任公司物业分公司 | Multi-energy complementary system optimal control method and device based on large-scale ground source heat pump |
| CN118009582A (en) * | 2024-04-10 | 2024-05-10 | 天津大学 | Combined type ground source heat pump system unit start-stop optimization method and device thereof |
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| CN118009582B (en) * | 2024-04-10 | 2024-06-07 | 天津大学 | Combined type ground source heat pump system unit start-stop optimization method and device thereof |
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