CN113531953A - Linkage control method for multi-energy cooling and heating - Google Patents
Linkage control method for multi-energy cooling and heating Download PDFInfo
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- CN113531953A CN113531953A CN202111093285.4A CN202111093285A CN113531953A CN 113531953 A CN113531953 A CN 113531953A CN 202111093285 A CN202111093285 A CN 202111093285A CN 113531953 A CN113531953 A CN 113531953A
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- ground source
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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
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Air Conditioning Control Device (AREA)
Abstract
The invention provides a linkage control method for multi-energy cooling and heating, which takes a whole year as a period and firstly judges whether the current energy supply season is winter or summer; the heat supply step under the working condition in winter is as follows: automatically controlling the operation of the ground source heat pump unit according to the system outlet water temperature; reading the operation parameters of the ground source heat pump unit, adjusting the frequency or the number of the ground source heat pump units according to the operation parameters, and ensuring that the ground source heat pump unit operates under the optimal working condition; the cooling step under summer working condition is as follows: the magnetic suspension unit is preferentially started under the condition of high energy efficiency; and operating the ground source heat pump unit and the magnetic suspension unit under other conditions. By effectively combining the magnetic suspension unit and the ground source heat pump unit, the invention can ensure the heat supply in winter, realize the segmented recharging control of the working condition in summer and effectively prevent the cold and hot unbalance of the ground.
Description
Technical Field
The invention relates to the field of environment and energy, in particular to a linkage control method for multi-energy cooling and heating.
Background
The ground source heat pump is one of the main forms of cold and heat supply of the existing clean energy, and because the ground source heat pump is a heating and air-conditioning system which utilizes the shallow geothermal resources (usually less than 400 meters deep) on the surface of the earth as cold and heat sources to perform energy conversion, the ground source heat pump system does work on the redundant heat in the building through a compressor and exchanges the redundant heat to an underground rock-soil layer when refrigerating in summer; when heating in winter, the ground source heat pump works through the compressor, extracts underground heat and sends the underground heat into the room to heat the building. The energy discharged into the ground by the ground source heat pump can cause larger temperature influence on the rock and soil layer around the buried pipe, so the ground source heat pump can not be used as a function, if refrigeration work is carried out in summer, heating is carried out in winter, and the energy discharged into the ground in winter and summer can be balanced. The simple generalization is as follows: how much heat is removed from the ground.
At present, when the building adopted the ground source heat pump cooling heat supply, generally adopted single energy mode, but the cold and hot demand of northern building is that heat is cold many less, so when long-term use because to the recharge heat in the earth with draw the heat disequilibrium, cause the refrigeration effect to descend.
Disclosure of Invention
In order to solve the problems, the invention provides a linkage control method for multi-energy cooling and heating, which is realized by the following technical scheme:
a linkage control method for multi-energy cooling and heating is characterized in that a whole year is used as a large period, an extremely short time is used as a cycle unit, for example, every second or every millisecond, and the current energy supply season is judged to be winter or summer;
the heat supply step under the working condition in winter is as follows:
automatically controlling the operation of the ground source heat pump unit according to the system outlet water temperature, wherein the system outlet water temperature is the water temperature output to a building by machine room equipment in a central air-conditioning system;
reading the operation parameters of the ground source heat pump unit, controlling the number and the frequency of the circulating water pump and the ground source heat pump unit according to the operation parameters, and ensuring that the ratio of the heat or cold generated by the ground source heat pump unit during operation to the consumed electric energy is maximum;
the cooling step under summer working condition is as follows:
and operating a cooperative cooling strategy of the ground source heat pump unit and the magnetic suspension unit.
Preferably, the operating parameters of the ground source heat pump unit under the winter working condition comprise:
the load rate of the ground source heat pump unit, and the temperature of supply and return water at the ground source side and the temperature of supply and return water at the load side, which are obtained by measuring and controlling a feedback point through a sensor arranged on a pipeline; the number and the operating frequency of the circulating water pumps on the ground source side and the circulating water pumps on the load side are controlled, the circulating water pumps are not part of the ground source heat pump, the circulating water pumps and the ground source heat pump form a whole system, the ground source side and the load side are respectively provided with more than two water pumps according to different heat demands of buildings, and a large system is respectively provided with more than six water pumps.
Preferably, the specific steps of ensuring that the ratio of the heat or cold generated by the ground source heat pump unit during operation to the consumed electric energy is maximum under the working condition in winter are as follows:
calculating an absolute value delta T1 of the temperature difference of the water supply and return on the ground source side and an absolute value delta T2 of the temperature difference of the water supply and return on the load side;
calculating the load rate of the ground source heat pump unit;
judging according to the temperature difference, and determining to increase or decrease the frequency of the circulating water pumps or increase or decrease the number of the circulating water pumps;
and judging according to the load rate of the ground source heat pump units, and determining to increase or decrease the number of the ground source heat pump units.
Preferably, the steps in the summer working condition are specifically realized as follows:
the cold supply stage is divided into a cold supply initial stage, a cold supply middle stage and a cold supply final stage;
in the initial stage and the final stage of cooling, the ground source heat pump unit operates in a heat recovery mode to prepare domestic hot water, and the magnetic suspension water chilling unit supplements the cooling demand;
and in the middle stage of cooling, operating the ground source heat pump unit and the magnetic suspension unit.
Preferably, the decision strategies for the initial stage of cooling, the intermediate stage of cooling, and the final stage of cooling are:
setting Q1 as forecasting cooling capacity in summer (setting parameters of a ground source heat pump), setting Q2 as heat extracted by a ground source side, setting the difference value delta Q = Q1-Q2 between the two, setting the heat dissipation capacity of a cooling tower as Q3 and the heat consumption capacity of domestic hot water as Q4, stopping the operation of the magnetic suspension water chilling unit when Q3+ Q4 is greater than delta Q K, and ending the initial cooling period;
k is a heat difference weight coefficient, the initial value is 0-1, when the system runs in the later period, the value of K is calculated when the running time of the magnetic suspension cold water set in the cold supply initial period and the cold supply final period is consistent according to the time and the heat dissipation data of the cold supply initial period, the cold supply middle period and the cold supply final period in the actual running of the previous year, and the system calculates the average value through historical values and takes the average value as the value of the current K;
and setting the heat released to the ground source side to be Q5, and when the local Q2 is more than or equal to Q5, the ground source heat pump prepares domestic hot water, starts the magnetic suspension set for cooling, and ends the middle cooling period.
Preferably, the operation strategy in the middle cooling period is as follows:
in the cold supply middle period, the ground source heat pump unit supplies cold in a refrigeration mode, and heat is released to the ground source side;
and when the water temperature on the ground source side is higher than the design temperature calculated according to the building load of the building, starting the magnetic suspension unit and the ground source heat pump to supply cold at the same time, otherwise, stopping the magnetic suspension unit, and only starting the ground source heat pump unit to supply cold.
Preferably, in the emergency situation of working conditions in summer, the magnetic suspension unit is put into the ground source heat pump at any time during the cooling period to guarantee the cooling demand, or the magnetic suspension unit is forced to operate by manual intervention to quickly reduce the temperature of chilled water, so that the cooling demand in the emergency situation is guaranteed.
The invention has the advantages that:
the technical scheme adopts the magnetic suspension centrifugal unit with higher cooling efficiency as a cold source supplement, adjusts the balance of recharging heat and extracting heat by switching the operation of different energy sources, fully considers the characteristics that the magnetic suspension centrifugal unit has high efficiency in the initial cooling period and the ground source heat pump has relatively stable efficiency in the whole cooling period, ensures that the magnetic suspension centrifugal unit works in the periods with higher efficiency in the early and last cooling periods as much as possible through the prejudgment function, and simultaneously ensures that the recharging energy and the extracting energy are consistent as much as possible;
by effectively combining the magnetic suspension unit and the ground source heat pump unit, the invention can ensure the heat supply in winter, realize the segmented recharging control of the working condition in summer and effectively prevent the cold and hot unbalance of the ground.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a flow chart of an embodiment of the present invention;
FIG. 2 is a flow chart of a summer operating strategy according to an embodiment of the present invention;
fig. 3 is a flowchart of a winter condition operation strategy according to an embodiment of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The invention discloses a linkage control method for multi-energy cooling and heating, which takes a whole year as an operation period and a short-term time as a circulation unit, such as circulation per second, and ensures that a magnetic suspension unit preferentially works in a refrigeration season and works under the condition of high energy efficiency as far as possible on the basis of comprehensively considering the cold-heat balance of a ground source heat pump system. The specific flow is shown in figure 1.
1. Working conditions in winter:
a ground source heat pump: the operation of the unit is automatically controlled according to the system water outlet temperature according to the building heat supply requirement.
Reading the operating parameters of the ground source heat pump unit: the ground source side supplies backwater temperature, the load side supplies backwater temperature, the number of running sets and the running frequency of the ground source side circulating water pumps and the load side circulating water pumps are controlled, the ground source side and the load side are respectively provided with more than two water pumps according to different heat demands of buildings, and a large system is respectively provided with six and seven water pumps, so that the ground source heat pump unit is ensured to run under the optimal working condition, wherein the optimal working condition is to ensure that the ratio of heat generation or cold energy to electric energy consumption is the maximum when the ground source heat pump unit runs.
For example: when the temperature difference delta T of supply and return water on the ground source side is greater than 5 ℃, increasing the frequency of a circulating water pump on the ground source side, and when the frequency of the circulating water pump is greater than 50Hz, increasing the running number of the circulating water pumps;
when the temperature difference delta T of the supplied water and the returned water is less than 5 ℃, the frequency of the circulating water pump on the ground source side is reduced, and when the frequency of the circulating water pump is less than 30Hz, the running number of the circulating water pumps is reduced.
The number of the ground source heat pump units is controlled: the number of the ground source heat pumps is started, the judgment is carried out according to the load rate of the unit, and the comprehensive control is carried out by combining the domestic hot water and the heating load.
For example: when the operation load rate of the ground source heat pump unit is more than 90%, adding one ground source heat pump unit;
when the operation load rate of the ground source heat pump unit is less than 30%, one ground source heat pump unit is reduced.
2. Summer working condition
The switching between the magnetic suspension centrifugal machine and the ground source heat pump is mainly controlled by Q1 (forecasting cooling capacity in summer) -Q2 (taking heat quantity on the ground source side) = delta Q according to the delta Q, and the magnetic suspension centrifugal machine and the ground source heat pump are controlled by overall calculation to enable the magnetic suspension machine set to be preferentially started at the initial stage and the final stage of cooling as far as possible under the conditions of low outdoor temperature and high energy efficiency of the magnetic suspension machine set.
In the initial cooling stage, the ground source heat pump unit operates in a heat recovery mode to prepare domestic hot water, the magnetic suspension water chilling unit supplements the cooling demand, and when Q3 (the heat dissipation capacity of the cooling tower) + Q4 (the heat consumption of the domestic hot water) > [ delta ] Q (0-1), the magnetic suspension water chilling unit stops operating, and the initial cooling stage is finished.
And K is a heat difference weight coefficient, the initial value is 0-1, the value of K is calculated when the running time of the magnetic suspension cold water set in the cold supply initial stage and the cold supply final stage is consistent according to the time and the heat dissipation data of the cold supply initial stage, the cold supply middle stage and the cold supply final stage in actual running of the past year, and the system calculates the average value through historical values and takes the average value as the value of the current K.
In the middle stage of cooling, the ground source heat pump unit supplies cooling in a refrigeration mode, most of heat is released to the ground source side, when the water temperature at the ground source side is higher than the design temperature (the temperature is generally marked on a design drawing) calculated according to the building load of a building, the magnetic suspension unit is started for cooling, when Q5 (the heat released to the ground source side) is greater than or equal to Q2 (the heat taken from the ground source side), the ground source heat pump prepares domestic hot water, the magnetic suspension unit is started for cooling, and the middle stage of cooling is finished.
And at the last stage of cooling, the ground source heat pump unit operates in a heat recovery mode to prepare domestic hot water, and the magnetic suspension water chilling unit supplements the cooling demand until the cooling season is finished.
Under emergency, the magnetic suspension unit is put into the ground source heat pump at any time during cold supply to guarantee cold supply requirements through temperature rise rate control of chilled water, and the magnetic suspension unit can be forced to operate through manual intervention to quickly reduce the temperature of the chilled water, so that the cold supply requirements under emergency are guaranteed.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A linkage control method for multi-energy cooling and heating is characterized in that a whole year is taken as a period, and the current energy supply season is judged to be winter or summer;
the heat supply step under the working condition in winter is as follows:
automatically controlling the operation of the ground source heat pump unit according to the system outlet water temperature, wherein the system outlet water temperature is the water temperature output to a building by machine room equipment in a central air-conditioning system;
reading the operation parameters of the ground source heat pump unit, controlling the number and the frequency of the circulating water pump and the ground source heat pump unit according to the operation parameters, and ensuring that the ratio of the heat or cold generated by the ground source heat pump unit during operation to the consumed electric energy is maximum;
the cooling step under summer working condition is as follows:
and operating a cooperative cooling strategy of the ground source heat pump unit and the magnetic suspension unit.
2. The linkage control method for multi-energy source cold and heat supply according to claim 1, wherein the operating parameters of the ground source heat pump unit under the winter condition comprise:
the load rate of the ground source heat pump unit;
and the temperature of the supply and return water at the ground source side and the temperature of the supply and return water at the load side are obtained by measuring and controlling feedback points through sensors arranged on the pipelines.
3. The linkage control method for multi-energy cold and heat supply according to claim 2, wherein the specific steps of ensuring that the ratio of the heat or cold generated by the ground source heat pump unit during operation to the consumed electric energy is the maximum under the working condition in winter are as follows:
calculating an absolute value delta T1 of the temperature difference of the water supply and return on the ground source side and an absolute value delta T2 of the temperature difference of the water supply and return on the load side;
calculating the load rate of the ground source heat pump unit;
judging according to the temperature difference, and determining to increase or decrease the frequency of the circulating water pumps or increase or decrease the number of the circulating water pumps;
and judging according to the load rate of the ground source heat pump units, and determining to increase or decrease the number of the ground source heat pump units.
4. The linkage control method for multi-energy cooling and heating according to claim 1, wherein the summer working condition collaborative cooling strategy is specifically implemented as follows:
the cold supply stage is divided into a cold supply initial stage, a cold supply middle stage and a cold supply final stage;
in the initial stage and the final stage of cooling, the ground source heat pump unit operates in a heat recovery mode to prepare domestic hot water, and the magnetic suspension water chilling unit supplements the cooling demand;
and in the middle stage of cooling, operating the ground source heat pump unit and the magnetic suspension unit.
5. The coordinated control method for multi-energy cooling and heating according to claim 4, wherein the decision strategies for the initial stage, the middle stage and the final stage of cooling are as follows:
setting Q1 as forecasting cooling capacity in summer, setting Q2 as heat extracted from a ground source side, setting the difference value delta Q = Q1-Q2, setting the heat dissipation capacity of a cooling tower as Q3 and the heat consumption capacity of domestic hot water as Q4, stopping the operation of the magnetic suspension water chilling unit when Q3+ Q4 is more than delta Q K, and ending the initial cooling period;
k is a heat difference weight coefficient, the initial value is 0-1, when the system runs in the later period, the value of K is calculated when the running time of the magnetic suspension cold water set in the cold supply initial period and the cold supply final period is consistent according to the time and the heat dissipation data of the cold supply initial period, the cold supply middle period and the cold supply final period in the actual running of the previous year, and the system calculates the average value through historical values and takes the average value as the value of the current K;
and setting the heat released to the ground source side to be Q5, and when the local Q2 is more than or equal to Q5, the ground source heat pump prepares domestic hot water, starts the magnetic suspension set for cooling, and ends the middle cooling period.
6. The coordinated control method for multi-energy source cooling and heating according to claim 4, wherein the operation strategy in the middle cooling period is as follows:
in the cold supply middle period, the ground source heat pump unit supplies cold in a refrigeration mode, and heat is released to the ground source side;
and when the water temperature on the ground source side is higher than the design temperature, the magnetic suspension unit and the ground source heat pump are started to supply cold at the same time, otherwise, the magnetic suspension unit is stopped, and only the ground source heat pump unit is started to supply cold.
7. The coordinated control method for multi-energy source cooling and heating according to claim 1, wherein the summer working condition further comprises the steps of:
in an emergency, the magnetic suspension unit is put into the ground source heat pump at any time during the cooling period to guarantee the cooling demand, or the magnetic suspension unit is forced to operate by manual intervention to quickly reduce the temperature of the chilled water, so that the cooling demand in the emergency is guaranteed.
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| CN202111093285.4A CN113531953A (en) | 2021-09-17 | 2021-09-17 | Linkage control method for multi-energy cooling and heating |
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| CN202111093285.4A CN113531953A (en) | 2021-09-17 | 2021-09-17 | Linkage control method for multi-energy cooling and heating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115523644A (en) * | 2022-11-04 | 2022-12-27 | 蘑菇物联技术（深圳）有限公司 | Method, apparatus and storage medium for controlling host of air conditioning system |
| CN116007231A (en) * | 2022-12-16 | 2023-04-25 | 珠海格力电器股份有限公司 | Ground source heat pump unit, control method and device thereof and storage medium |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115523644A (en) * | 2022-11-04 | 2022-12-27 | 蘑菇物联技术（深圳）有限公司 | Method, apparatus and storage medium for controlling host of air conditioning system |
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Application publication date: 20211022 |