CN114877491B - Central air conditioner water system work control method, central air conditioner water system and control device - Google Patents
Central air conditioner water system work control method, central air conditioner water system and control device Download PDFInfo
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- CN114877491B CN114877491B CN202210533225.8A CN202210533225A CN114877491B CN 114877491 B CN114877491 B CN 114877491B CN 202210533225 A CN202210533225 A CN 202210533225A CN 114877491 B CN114877491 B CN 114877491B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 806
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000001816 cooling Methods 0.000 claims abstract description 187
- 238000007710 freezing Methods 0.000 claims abstract description 110
- 230000008014 freezing Effects 0.000 claims abstract description 110
- 239000000498 cooling water Substances 0.000 claims abstract description 71
- 238000004378 air conditioning Methods 0.000 claims abstract description 33
- 238000007599 discharging Methods 0.000 claims description 5
- 239000008400 supply water Substances 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 239000003657 drainage water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/37—Resuming operation, e.g. after power outages; Emergency starting
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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
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- 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
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/50—Load
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention provides a central air-conditioning water system working control method, a central air-conditioning water system and a control device, and relates to the technical field of air conditioners. When the regulation is satisfied, the cooling tower drain water and the unit freezing side drain water are mixed to be used for increasing the temperature of the cooling side unit water, so that the temperature of the cooling side unit water is larger than the lowest starting temperature of the cooling side as much as possible. When the regulation is satisfied, the water discharged from the cooling side of the unit and the backwater from the freezing side of the unit are mixed to be used for improving the temperature of the water returned from the freezing side of the unit, so that the temperature of the water returned from the freezing side of the unit is larger than the difference value between the set value of the temperature of the frozen water outlet of the unit and the deviation value of the temperature of the water outlet, and the condition that the water cannot be started due to low temperature of the cooling water is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a central air conditioner water system work control method, a central air conditioner water system and a control device.
Background
The water system of the water-cooled central air conditioning system comprises a cooling water system and a chilled water/hot water system (generally adopting a single pipe, circulating chilled water in summer and hot water in winter).
For the chilled water circulation system, the part consists of a chilled pump, an indoor fan, a chilled water pipeline and the like. The low-temperature chilled water flowing out of the host evaporator is pressurized by a chilled pump and sent into a chilled water pipeline (outlet water), enters the room for heat exchange, takes away heat in the room, and finally returns to the host evaporator (return water). The indoor fan is used for blowing air through the chilled water pipeline, reducing the temperature of the air and accelerating indoor heat exchange.
For the cooling water circulation part, the part consists of a cooling pump, a cooling water pipeline, a cooling water tower and the like, and when the chilled water circulation system performs indoor heat exchange, a large amount of indoor heat energy is taken away. The heat energy is transferred to the cooling water through the refrigerant in the host machine, so that the temperature of the cooling water is increased. The cooling pump presses the heated cooling water into the cooling water tower (outlet water) to make heat exchange with the atmosphere, and sends the cooled cooling water back to the host condenser (backwater) after the temperature is reduced.
For the main unit (unit), the main unit part is composed of a compressor, an evaporator, a condenser, a refrigerant (refrigerant) and the like.
The applicant found that the prior art has at least the following technical problems:
(1) The group control system on the market at present mainly aims at the control function which is made on the premise that the machine set can continuously run, and for the low-load working condition of the water system, the conventional control mode at present is that when the frozen water outlet temperature of the machine set is smaller than the frozen water outlet temperature set value plus the water outlet temperature deviation value of the machine set, the machine set is gradually unloaded, when the frozen water outlet temperature of the machine set is smaller than the frozen water outlet temperature set value-water outlet temperature deviation value of the machine set (namely, the machine set load is lower than the minimum load set value), the machine set is standby, the machine set is frequently started and stopped, and when the machine set is restarted again after standby, a certain time is required to be met, and the problem that the frozen water outlet temperature of the machine set is higher in the standby process of the machine set, and the terminal load requirement cannot be met in time is solved;
(2) The central air conditioner has a lowest starting temperature of a cooling side, and when the temperature is lower than the lowest starting temperature, the unit cannot be started, and the starting method in the market is to increase electric heating to perform heating treatment.
Disclosure of Invention
The invention aims to provide a central air-conditioning water system work control method, a central air-conditioning water system and a control device, which are used for solving the problems. The preferred technical solutions of the technical solutions provided by the present invention can produce a plurality of technical effects described below.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a method for controlling the operation of a water system of a central air conditioner, which comprises the following steps: judging whether the condition of improving the water temperature of the cooling side unit is met, if yes, guiding the mixed chilled water and cooling tower drainage to a condenser of the unit so as to improve the water temperature of the cooling side unit; or/and judging whether the condition of improving the water temperature of the refrigerating side return unit is met, if so, guiding the mixed cooling water and the refrigerating side return water of the unit to an evaporator of the unit so as to improve the water temperature of the cooling side unit.
Further, when the water temperature of the cooling side unit is lower than the minimum starting temperature value of the unit and the water temperature of the mixed chilled water and cooling tower drain water is higher than the minimum starting temperature value of the unit, judging that the condition of improving the water temperature of the cooling side unit is met.
Further, when the temperature of the chilled water is greater than a first mixing set temperature value and the temperature of the chilled water and cooling tower drain water is less than the first mixing set temperature value, it is determined that the chilled water meets the conditions for mixing with the cooling tower drain water.
Further, a water supply tank is arranged between the water discharge pipeline of the evaporator and the water inlet pipeline of the condenser, or a water supply tank is arranged between the water return pipeline of the evaporator and the water inlet pipeline of the condenser, so that the water is discharged by the chilled water and the cooling tower.
Further, the chilled water is the unit chilled side drainage; when the condition of improving the water temperature of the cooling side inlet unit is met, controlling water discharged by the cooling tower to flow to the water supply tank and guiding the water discharged by the water supply tank to the condenser; when the water temperature of the cooling side unit is not lower than the minimum starting temperature value of the unit, controlling water discharged from the cooling tower to directly flow to the condenser without passing through the water supply tank; when the freezing side drainage meets the condition of mixing with the cooling tower drainage, controlling the water discharged by the evaporator to flow to the water supply tank and guiding the water discharged by the water supply tank to an indoor heat exchange pipeline; when the water temperature of the water supply tank is not lower than the first mixing set temperature value or the water temperature of the freezing side drainage water is not higher than the first mixing set temperature value, controlling the water discharged from the evaporator to directly flow to the indoor pipeline without passing through the water supply tank.
Further, when the temperature of the return water at the freezing side is smaller than the set temperature of the machine, and the temperature of the return water at the freezing side is smaller than the water temperature of the mixed cooling water and return water at the freezing side of the machine set, the condition of improving the water temperature of the return water at the freezing side of the machine set is judged to be met.
Further, when the temperature of the cooling water is greater than a second mixing set temperature value and the water temperature of the mixed cooling water and the return water at the freezing side of the unit is lower than the second mixing set temperature value, judging that the cooling water meets the condition of mixing with the return water at the freezing side.
Further, a backwater water tank is arranged between the water inlet pipeline of the evaporator and the water outlet pipeline of the condenser or between the water inlet pipeline of the evaporator and the water inlet pipeline of the condenser, so as to be used for mixing the cooling water and the backwater of the refrigerating side of the unit.
Further, the cooling water is cooling side drainage, and when the condition of improving the water temperature of the refrigerating side return unit is met, the water discharged by the indoor cooling pipe is controlled to flow to the return water tank and the water discharged by the return water tank is guided to the evaporator; when the return water temperature at the freezing side is not less than the shutdown set temperature, controlling water discharged from the indoor cooling pipe to directly flow to the evaporator without passing through the return water tank; when the cooling side drainage meets the condition of mixing with the freezing side backwater, controlling the water discharged by the condenser to flow to the backwater water tank and guiding the water discharged by the backwater water tank to the cooling tower; when the temperature of the cooling side water discharge is not more than the second mixed set temperature value or the water temperature in the backwater water tank is not less than the second mixed set temperature value, controlling the water discharged from the condenser to directly flow to the cooling tower without passing through the backwater water tank.
The invention provides a central air-conditioning water system used for the central air-conditioning water system work control method, which comprises a water supply tank, wherein the water supply tank is connected with a water discharge pipeline of an evaporator and a water inlet pipeline of a condenser through a pipeline or is connected with the water inlet pipeline of the evaporator and the water inlet pipeline of the condenser through a pipeline, so as to realize the mixing of the chilled water and the cooling tower water discharge when the valve body on-off state on the pipeline is changed; and/or the water return tank is connected with the water inlet pipeline of the evaporator and the water outlet pipeline of the condenser through pipelines or connected with the water inlet pipeline of the evaporator and the water inlet pipeline of the condenser through pipelines, so that the cooling water and the return water on the refrigerating side of the unit are mixed when the on-off state of the valve body on the pipelines is changed.
The present invention provides a control device, comprising: the collecting module is used for collecting and improving parameters of the water temperature condition of the cooling side unit and/or collecting and improving parameters of the water temperature condition of the freezing side return unit; the judging module is used for judging whether the parameters meet the condition of improving the water temperature of the cooling side unit and/or meet the condition of improving the water temperature of the freezing side return unit and can issue a control instruction; the adjusting module is used for receiving the control instruction of the judging module so as to guide the mixed chilled water and cooling tower drainage to a condenser of the central air-conditioning water system unit and/or guide the mixed chilled water and the refrigerating side return water of the unit to an evaporator of the central air-conditioning water system unit.
Further, the control device further includes: the mixing and collecting module is used for collecting the temperature parameter of the chilled water and/or the temperature parameter of the cooling water; the mixing and collecting module is connected with the judging module, the judging module can judge whether the chilled water meets the condition of mixing with the cooling tower drainage and/or judge whether the cooling water meets the mixing condition of returning water at the freezing side of the unit, and can send a control instruction to the adjusting module so that the chilled water is mixed with the cooling tower drainage and/or so that the cooling water is mixed with the returning water at the freezing side of the unit.
The central air conditioner has a minimum start-up temperature on the cooling side below which the unit cannot start up. Based on this, the invention provides a control method, the main principle of which is as follows: when the conditions are met, the cooling tower drain water and the chilled water are mixed to be used for increasing the temperature of the cooling side unit water, so that the temperature of the cooling side unit water is larger than the lowest starting temperature of the cooling side as much as possible.
In addition, when the set freezing water outlet temperature is smaller than the set freezing water outlet temperature-water outlet temperature deviation value (the set freezing water outlet temperature is too low, and the set load is lower than the set minimum load), the set is standby, the set is frequently started and stopped, and the set needs to be restarted again after standby for a certain time, and the problem that the set freezing water outlet temperature is higher in the set standby process and the end load needs cannot be timely met is solved. Based on this, the invention provides a control method, the main principle of which is as follows: when the conditions are met, the set cooling water and the set freezing side backwater are mixed to be used for improving the temperature of the freezing side backwater set water, so that the temperature of the freezing side backwater set water is larger than the difference value of the set freezing outlet water temperature set value and the outlet water temperature deviation value as much as possible.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a prior art central air conditioning water system.
FIG. 2 is a schematic diagram of a central air conditioning water system provided by an embodiment of the present invention;
FIG. 3 is a flow chart of water replenishment of a water supply tank provided by an embodiment of the invention;
fig. 4 is a flow chart of water supply from a water supply tank according to an embodiment of the present invention;
FIG. 5 is a flow chart of water replenishing of a backwater tank provided by an embodiment of the invention;
fig. 6 is a flow chart of water supply from a backwater tank according to an embodiment of the present invention.
100-condenser in the figure; 200-an evaporator; 300-a water supply tank; 400-backwater water tank; 500-cooling tower; 600-a cold water pump; 700-a chilled water pump; 800-seventh connecting duct; 801-eighth connecting pipe; 900-a first valve body; 901-a second valve body; 902-a third valve body; 903-fourth valve body; 904-a fifth valve body; 905-sixth valve body; 906-seventh valve body; 907-eighth valve body; 908-a ninth valve body; 909-tenth valve body; 910-eleventh valve body; 911-twelfth valve body; 912-thirteenth valve body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
Example 1:
the invention provides a method for controlling the operation of a water system of a central air conditioner, which comprises the following steps: and judging whether the condition of increasing the water temperature of the cooling side unit is met, if so, guiding the mixed chilled water and cooling tower drain water to the condenser 100 of the unit so as to be used for increasing the water temperature of the cooling side unit and improving the condition that the cooling side unit cannot be started due to low cooling water temperature. The central air conditioner has a minimum start-up temperature on the cooling side below which the unit cannot start up. Based on this, the invention provides a control method, the main principle of which is as follows: the cooling side unit water temperature is increased by mixing the chilled water with the unit chilled side water discharge to maximize the cooling side unit water temperature greater than the cooling side minimum start temperature, and the control method is required to meet the cooling side unit water temperature increasing condition.
A water supply tank 300 is provided between a water drain pipe of the evaporator 200 and a water inlet pipe of the condenser 100 or a water supply tank 300 is provided between a water return pipe of the evaporator 200 and a water inlet pipe of the condenser 100, referring to fig. 2, it is illustrated that the water supply tank 300 is provided between the water drain pipe of the evaporator 200 and the water inlet pipe of the condenser 100, and water discharged from the cooling tower 500 is controlled to flow to the water supply tank 300 and water discharged from the cooling tower 500 flows to the water supply tank 300 for mixing cooling tower drainage and unit freezing side drainage.
Specifically, when the water supply tank 300 is disposed between the water discharge pipe of the evaporator 200 and the water intake pipe of the condenser 100, the chilled water mixed with the cooling tower water discharge is the unit chilled side water discharge, and when the cooling side unit water temperature is lower than the unit minimum starting temperature value and the water temperature in the water supply tank 300 is greater than the unit minimum starting temperature value (i.e., the condition for increasing the cooling side unit water temperature is satisfied), the water discharged from the cooling tower 500 is controlled to flow to the water supply tank 300 and the water discharged from the water supply tank 300 is guided to the condenser 100, so as to increase the temperature of the cooling side unit water; when the cooling side unit water temperature is not lower than the unit minimum start-up temperature value, the water discharged from the cooling tower 500 is controlled to flow directly to the condenser 100 without passing through the water supply tank 300.
When the temperature of the chilled water is greater than the first mixing set temperature value and the temperature of the chilled water and cooling tower drain water is less than the first mixing set temperature value (i.e., the chilled water meets the conditions of mixing with the cooling tower drain water), controlling the water discharged from the evaporator 200 to flow to the water supply tank 300 and directing the water discharged from the water supply tank 300 to the indoor heat exchange pipe to raise the temperature of the cooling side unit water; when the water temperature of the water supply tank 300 is not lower than the first mixing set temperature value or the chilled side water discharge temperature is not higher than the first mixing set temperature value, the water discharged from the evaporator 200 is controlled to directly flow to the indoor piping without passing through the water supply tank 300.
A central air-conditioning water system for realizing a central air-conditioning water system operation control method comprises a water supply tank 300, wherein the water supply tank 300 is connected with a water discharge pipeline of an evaporator 200 and a water inlet pipeline of a condenser 100 through pipelines, or the water supply tank 300 is connected with the water inlet pipeline of the evaporator 200 and the water inlet pipeline of the condenser 100 through pipelines, so as to realize the mixing of chilled water and cooling tower water discharge when the on-off state of a valve body on the pipelines is changed. Referring to fig. 2, it is illustrated that the water supply tank 300 is connected to the drain pipe of the evaporator 200 and the water inlet pipe of the condenser 100 through a pipe, when the condition of increasing the water temperature of the cooling side unit is satisfied, the valve body on-off state of the pipe is changed, water discharged from the cooling tower 500 can flow to the water supply tank 300 and can guide water flowing into the water supply tank 300 to the condenser 100, and when chilled water satisfies the condition of mixing with cooling tower water discharge, the valve body on-off state of the pipe is changed, water discharged from the evaporator 200 can flow to the water supply tank 300 and can guide water flowing into the water supply tank 300 to the indoor heat exchange pipe.
Referring to fig. 2, a first connection pipe and a second connection pipe are both connected with a water inlet pipe of the condenser 100 and the water supply tank 300, valve bodies are arranged on the first connection pipe and the second connection pipe, a first valve body 900 is arranged on the first connection pipe, a second valve body 901 is arranged on the second connection pipe, and a third valve body 902 is arranged between the connection part of the first connection pipe and the water inlet pipe of the condenser 100 and the connection part of the second connection pipe and the water inlet pipe of the condenser 100; when the water temperature of the cooling side unit is lower than the minimum starting temperature value of the unit and the water temperature in the water supply tank 300 is higher than the minimum starting temperature value of the unit, the first valve body 900 and the second valve body 901 are controlled to be opened, the third valve body 902 is closed, the water discharged from the cooling tower 500 flows to the water supply tank 300 through the first connecting pipe under the driving of the cooling water pump 600, and the water discharged from the water supply tank 300 is guided to the condenser 100 through the second connecting pipe.
The third connecting pipeline and the fourth connecting pipeline are both connected with the water outlet pipeline of the evaporator 200 and the water supply tank 300, valve bodies are arranged on the third connecting pipeline and the fourth connecting pipeline, the fourth valve body 903 is arranged on the third connecting pipeline, the fifth valve body 904 is arranged on the fourth connecting pipeline, and the sixth valve body 905 is arranged between the connecting part of the third connecting pipeline and the water outlet pipeline of the evaporator 200 and the connecting part of the fourth connecting pipeline and the water outlet pipeline of the evaporator 200. When the temperature of the chilled water discharged from the evaporator 200 is higher than the set temperature of the water supply tank and the temperature of the water supply tank 300 is lower than the set temperature of the water supply tank, the fourth valve body 903 and the fifth valve body 904 are opened, the sixth valve body 905 is closed, and under the action of the chilled water pump 700, the water discharged from the evaporator 200 flows to the water supply tank 300 through the third connecting pipe, and the water discharged from the water supply tank 300 is guided to the indoor heat exchange pipe through the third connecting pipe so as to raise the temperature of the water of the cooling side unit; when the water temperature of the water supply tank 300 is not lower than the water supply tank set temperature or the chilled side drain water temperature is not higher than the water supply tank set temperature, the fourth valve body 903 and the fifth valve body 904 are closed, the sixth valve body 905 is opened, and the water discharged from the evaporator 200 is controlled to directly flow to the indoor piping without passing through the water supply tank 300.
A control device of a central air conditioning water system, comprising: the collecting module is used for collecting and improving parameters of the water temperature condition of the cooling side unit; the judging module is used for judging whether the parameters meet the condition of improving the water temperature of the cooling side unit or not and issuing a control instruction; the adjusting module is used for receiving the control instruction and adjusting the condenser 100 for discharging the mixed chilled water and cooling water to the central air-conditioning water system unit.
The control device is also provided with a mixing and collecting module for collecting the temperature parameters of the chilled water; the mixing collection module is connected with the judging module, and the judging module can judge whether the chilled water meets the condition of mixing with the cooling tower drainage and can send a control instruction to the adjusting module so as to facilitate the mixing of the chilled water and the cooling tower drainage.
A water supply tank 300 is provided between the drain pipe of the evaporator 200 and the water inlet pipe of the condenser 100; the collecting module comprises a cooling side inlet unit water temperature sensor and a water supply water tank water temperature sensor, the mixing collecting module comprises a freezing side outlet unit water temperature sensor, and the cooling side inlet unit water temperature sensor, the freezing side outlet unit water temperature sensor and the water supply water tank water temperature sensor are all connected with the judging module. The cooling side unit water temperature sensor is used for detecting the temperature of cooling side unit water, the freezing side unit water temperature sensor is used for detecting the temperature of freezing side unit water, the water supply tank water temperature sensor is used for detecting the water temperature in the water supply tank, the cooling side unit water temperature sensor, the freezing side unit water temperature sensor and the water supply tank water temperature sensor can convey detected signal parameters to the judging module, the judging module can control the adjusting module, namely the valve body on the central air-conditioning water system according to relevant parameters, so that when the condition of improving the cooling side unit water temperature is met, the valve body on-off state on a pipeline is changed, mixed cooling tower drainage and unit freezing side drainage are led to the condenser 100 of the unit, when the unit freezing side drainage meets the condition of mixing with the cooling tower drainage, the valve body on-off state on the pipeline is changed, and the unit freezing side drainage is led to the water supply tank 300, so that the condition that the cooling side drainage cannot be started due to low cooling water temperature is improved.
Example 2:
the invention provides a method for controlling the operation of a water system of a central air conditioner, which comprises the following steps: and judging whether the condition of improving the water temperature of the refrigerating side return unit is met, if so, guiding the mixed cooling water and the refrigerating side return water of the unit to the evaporator 200 of the unit so as to improve the water temperature of the refrigerating side return unit and improve the condition of frequent start and stop caused by low temperature of the refrigerating water return water. When the set freezing water outlet temperature is smaller than the set freezing water outlet temperature set value-the water outlet temperature deviation value, the set freezing water outlet temperature is too low, the set load is lower than the minimum load set value, the set is standby, the set is frequently started and stopped in the mode, a certain time is required to be met for restarting the set again after the set is standby, the set freezing water outlet temperature is higher in the set standby process, and the problem that the end load requirement cannot be met in time is solved. Based on this, the invention provides a control method, the main principle of which is as follows: the cooling water and the return water of the refrigerating side of the unit are mixed to be used for improving the temperature of the return water of the refrigerating side unit, so that the temperature of the return water of the refrigerating side unit is larger than the difference value between the set value of the refrigerating outlet water temperature of the unit and the deviation value of the outlet water temperature as much as possible, and the control method can be implemented only by meeting the condition of improving the water temperature of the return water of the refrigerating side unit.
A backwater water tank 400 is arranged between a water inlet pipeline of the evaporator 200 and a water outlet pipeline of the condenser 100, or the backwater water tank 400 is arranged between the water inlet pipeline of the evaporator 200 and the water inlet pipeline of the condenser 100, referring to fig. 2, it is shown that the backwater water tank 400 is arranged between the water inlet pipeline of the evaporator 200 and the water outlet pipeline of the condenser 100, water discharged by the condenser 100 is controlled to flow to the backwater water tank 400, and water discharged by an indoor cooling pipe is controlled to flow to the backwater water tank 400 so as to be used for mixing unit cooling pool water discharge and unit freezing side backwater.
Specifically, when the backwater water tank 400 is disposed between the water inlet pipe of the evaporator 200 and the water outlet pipe of the condenser 100, the cooling water is cooled side water discharged, and when the chilled side backwater temperature is less than the shutdown set temperature (i.e., the unit load is less than the minimum load set value) and the chilled side backwater temperature is less than the water temperature of the backwater water tank 400 (i.e., the condition of increasing the chilled side backwater unit water temperature is satisfied), the water discharged from the indoor cooling pipe is controlled to flow to the backwater water tank 400 and the water discharged from the backwater water tank 400 is guided to the evaporator 200; when the return water temperature at the freezing side is not less than the shutdown set temperature, that is, the unit load is not less than the minimum load set value, the water discharged from the indoor cooling pipe is controlled to flow directly to the evaporator 200 without passing through the return water tank 400.
When the temperature of the cooling water is greater than the second mixing set temperature value and the temperature of the mixed cooling water and the return water of the freezing side of the unit is lower than the second mixing set temperature value (the cooling meets the condition of mixing with the return water of the freezing side), controlling the water discharged by the condenser 100 to flow to the return water tank 400 and guiding the water discharged by the return water tank 400 to the cooling tower 500; when the cooling-side drain temperature is not greater than the second mixing set temperature value or the water temperature in the return water tank 400 is not lower than the second mixing set temperature value, the water discharged from the condenser 100 is controlled to directly flow to the cooling tower 500 without passing through the return water tank 400.
The central air-conditioning water system for realizing the work control method of the central air-conditioning water system comprises a backwater water tank 400, wherein the backwater water tank 400 is connected with a water inlet pipeline of an evaporator 200 and a water outlet pipeline of a condenser 100 through pipelines or the backwater water tank 400 is connected with the water inlet pipeline of the evaporator 200 and the water inlet pipeline of the condenser 100 through pipelines, and referring to fig. 2, the backwater water tank 400 is schematically connected with the water inlet pipeline of the evaporator 200 and the water outlet pipeline of the condenser 100 through pipelines so as to realize the mixing of cooling water and return water on the refrigerating side of a unit when the on-off state of a valve body on the pipelines is changed. When the condition of increasing the water temperature of the refrigerating side return unit is satisfied, the valve body on-off state on the pipeline is changed, water discharged from the condenser 100 can flow to the return water tank 400 and can guide water in the return water tank 400 to the cooling tower 500, when the cooling water satisfies the condition of mixing with the refrigerating side return water, the valve body on-off state on the pipeline is changed, water discharged from the indoor cooling pipe can flow to the return water tank 400 and can guide water in the return water tank 400 to the evaporator 200.
The fifth connecting pipeline and the sixth connecting pipeline are both connected with the water outlet pipeline of the condenser 100 and the backwater water tank 400, valve bodies are arranged on the fifth connecting pipeline and the sixth connecting pipeline, a seventh valve body 906 is arranged on the fifth connecting pipeline, an eighth valve body 907 is arranged on the sixth connecting pipeline, and a ninth valve body 908 is arranged between the connection part of the fifth connecting pipeline and the water outlet pipeline of the condenser 100 and the connection part of the sixth connecting pipeline and the water outlet pipeline of the condenser 100; when the cooling side drainage temperature is greater than the backwater water tank set temperature and the water temperature of the backwater water tank 400 is lower than the backwater water tank set temperature, the seventh valve body 906 and the eighth valve body 907 are opened, the ninth valve body 908 is closed, and the water discharged from the condenser 100 flows to the backwater water tank 400 through the fifth connecting pipeline under the driving of the cooling water pump 600, and the water discharged from the backwater water tank 400 is guided to the cooling tower 500 through the sixth connecting pipeline; when the cooling side drain temperature is not greater than the return water tank set temperature or the return water tank 400 temperature is not lower than the return water tank set temperature, the seventh valve body 906 and the eighth valve body 907 are closed, and the ninth valve body 908 is opened, and the water discharged from the condenser 100 is controlled to directly flow to the cooling tower 500 without passing through the return water tank 400 under the driving of the cooling water pump 600.
Referring to fig. 2, a seventh connection pipe 800 and an eighth connection pipe 801 are illustrated, the seventh connection pipe 800 and the eighth connection pipe 801 are connected to the backwater tank 400, a tenth valve body 909 is provided on the seventh connection pipe 800, an eleventh valve body 910 is provided on the eighth connection pipe 801, the eighth connection pipe 801 is connected to the backwater pipes of the two evaporators 200, and referring to fig. 2, the twelfth valve body 911 and the thirteenth valve body 912 are illustrated. When the freezing-side backwater temperature is less than the shutdown set temperature, the tenth valve body 909 and the eleventh valve body 910 are opened, the twelfth valve body 911 and the thirteenth valve body 912 are closed, and the water discharged from the indoor cooling pipe flows to the backwater tank 400 through the seventh connection pipe 800 under the driving of the chilled water pump 700, and the water in the backwater tank 400 flows to the water inlet pipes of the two evaporators 200 through the eighth connection pipe 801, respectively; when the freezing-side return water temperature is not less than the stop setting temperature or the freezing-side return water temperature is not less than the water temperature of the return water tank 400, the tenth valve body 909 and the eleventh valve body 910 are closed, the twelfth valve body 911 and the thirteenth valve body 912 are opened, and the water discharged from the indoor cooling pipe is controlled to directly flow to the evaporator 200 without passing through the return water tank 400 under the driving of the chilled water pump 700.
A control device of a central air conditioning water system, comprising: the collecting module is used for collecting and improving parameters of the water temperature condition of the freezing side return unit; the judging module is used for judging whether the parameters meet the condition of improving the water temperature of the freezing side return unit or not and issuing a control instruction; the adjusting module is used for receiving the control instruction and adjusting the evaporator 200 for discharging the mixed chilled water and cooling water to the central air-conditioning water system unit.
The mixing collection module is used for collecting temperature parameters of the cooling water; the mixing collection module is connected with the judging module, and the judging module can judge whether the cooling water meets the mixing condition of the return water on the freezing side of the unit and can send a control instruction to the adjusting module so as to facilitate the mixing of the cooling water and the return water on the freezing side of the unit.
A backwater tank 400 is arranged between a water inlet pipeline of the evaporator 200 and a water outlet pipeline of the condenser 100; the collecting module comprises a cooling side outlet unit water temperature sensor and a backwater water tank water temperature sensor, the mixing collecting module comprises a freezing side return unit water temperature sensor, and the cooling side outlet unit water temperature sensor, the freezing side return unit water temperature sensor and the backwater water tank water temperature sensor are all connected with the judging module. The cooling side water temperature sensor of the cooling side water outlet unit is used for detecting the temperature of cooling side water outlet unit, the freezing side water temperature sensor of the freezing side water return unit is used for detecting the temperature of freezing side water return unit, the water return water tank water temperature sensor is used for detecting the temperature of water in the water return water tank, the cooling side water temperature sensor of the cooling side water outlet unit, the freezing side water temperature sensor of the freezing side water return unit and the water return water tank water temperature sensor convey detected signal parameters to the judging module, the judging module can control the adjusting module, namely the valve body on the central air-conditioning water system according to related parameters, so that when the water temperature condition of the freezing side water return unit is improved, the valve body on-off state of a pipeline is changed, mixed unit cooling side drainage and unit freezing side water return are led to the evaporator 200 of the unit, when cooling water meets the condition of mixing with the freezing side water return, the valve body on-off state of the pipeline is changed, and the unit cooling side drainage is controlled to the water return tank 400 so as to be used for improving the condition of frequent start-stop caused by low water return temperature of the freezing water.
Example 3:
the invention provides a method for controlling the operation of a water system of a central air conditioner, which comprises the following steps: judging whether the condition of improving the water temperature of the cooling side unit is met, if yes, guiding the mixed chilled water and cooling tower drainage to a condenser 100 of the unit so as to improve the water temperature of the cooling side unit and improve the condition that the cooling side unit cannot be started due to low cooling water temperature; and judging whether the condition of improving the water temperature of the refrigerating side return unit is met, if so, guiding the mixed cooling water and the refrigerating side return water of the unit to the evaporator 200 of the unit so as to improve the water temperature of the refrigerating side return unit and improve the condition of frequent start and stop caused by low temperature of the refrigerating water return water. The central air conditioner has a minimum start-up temperature on the cooling side below which the unit cannot start up. In addition, when the set freezing water outlet temperature is smaller than the set freezing water outlet temperature set value-the water outlet temperature deviation value, the set freezing water outlet temperature is too low, the set load is lower than the set minimum load value, and the set is standby. Based on this, the invention provides a control method, the main principle of which is as follows: the cooling tower drain water and the chilled water are mixed to be used for increasing the temperature of the cooling side unit water, so that the cooling side unit water temperature is larger than the lowest starting temperature of the cooling side as much as possible, and the cooling side unit water temperature increasing condition is required to be met. The cooling water and the return water of the refrigerating side of the unit are mixed to be used for improving the temperature of the return water of the refrigerating side unit, so that the temperature of the return water of the refrigerating side unit is larger than the difference value between the set value of the refrigerating outlet water temperature of the unit and the deviation value of the outlet water temperature as much as possible, the condition that the refrigerating side unit cannot be started due to low temperature of the cooling water is improved, and the water temperature of the refrigerating side return unit is improved.
Referring to fig. 2, it is illustrated that a return water tank 400 is provided between a water inlet pipe of the evaporator 200 and a water outlet pipe of the condenser 100, and water discharged from the cooling tower 500 is controlled to flow to the water supply tank 300 and water discharged from the cooling tower 500 flows to the water supply tank 300 for mixing cooling tower water discharge and unit freezing side water discharge.
Specifically, when the backwater water tank 400 is arranged between the water inlet pipeline of the evaporator 200 and the water outlet pipeline of the condenser 100, the cooling water is cooled side water drainage, and when the freezing side backwater temperature is lower than the shutdown set temperature, namely the unit load is lower than the minimum load set value, and the freezing side backwater temperature is lower than the water temperature of the backwater water tank 400 (namely the condition of increasing the water temperature of the freezing side backwater unit is met), the water discharged by the indoor cooling pipe is controlled to flow to the backwater water tank 400 and the water discharged by the backwater water tank 400 is led to the evaporator 200; when the return water temperature at the freezing side is not less than the shutdown set temperature, that is, the unit load is not less than the minimum load set value, the water discharged from the indoor cooling pipe is controlled to flow directly to the evaporator 200 without passing through the return water tank 400.
When the temperature of the cooling water is greater than the second mixing set temperature value and the temperature of the mixed cooling water and the return water of the freezing side of the unit is lower than the second mixing set temperature value (the cooling water meets the condition of mixing with the return water of the freezing side), controlling the water discharged from the condenser 100 to flow to the return water tank 400 and guiding the water discharged from the return water tank 400 to the cooling tower 500; when the cooling-side drain temperature is not greater than the second mixing set temperature value or the water temperature in the return water tank 400 is not lower than the second mixing set temperature value, the water discharged from the condenser 100 is controlled to directly flow to the cooling tower 500 without passing through the return water tank 400.
A backwater tank 400 is arranged between a water inlet pipeline of the evaporator 200 and a water outlet pipeline of the condenser 100; the water discharged from the condenser 100 is controlled to flow to the backwater tank 400 and the water discharged from the indoor cooling pipe is controlled to flow to the backwater tank 400 for mixing the unit cooling pool water discharge and the unit freezing side backwater.
When the backwater water tank 400 is arranged between the water inlet pipeline of the evaporator 200 and the water outlet pipeline of the condenser 100, the cooling water is cooled side water drainage, and when the backwater temperature of the freezing side is lower than the shutdown set temperature, namely the unit load is lower than the minimum load set value, and the backwater temperature of the freezing side is lower than the water temperature of the backwater water tank 400 (namely the condition of improving the water temperature of the freezing side backwater unit is met), the water discharged by the indoor cooling pipe is controlled to flow to the backwater water tank 400 and the water discharged by the backwater water tank 400 is led to the evaporator 200; when the return water temperature at the freezing side is not less than the shutdown set temperature, that is, the unit load is not less than the minimum load set value, the water discharged from the indoor cooling pipe is controlled to flow directly to the evaporator 200 without passing through the return water tank 400.
A central air-conditioning water system for realizing a central air-conditioning water system operation control method comprises a water supply tank 300, wherein the water supply tank 300 is connected with a water discharge pipeline of an evaporator 200 and a water inlet pipeline of a condenser 100 through pipelines, so as to realize the mixing of chilled water and cooling tower water discharge when the on-off state of a valve body on the pipelines is changed; the water return tank 400 is connected with a water inlet pipeline of the evaporator 200 and a water outlet pipeline of the condenser 100 through pipelines, so that the water return tank 400 is used for realizing the mixing of cooling water and return water on the freezing side of the unit when the on-off state of a valve body on the pipelines is changed. .
Referring to fig. 2, a first connection pipe and a second connection pipe are both connected with a water inlet pipe of the condenser 100 and the water supply tank 300, valve bodies are arranged on the first connection pipe and the second connection pipe, a first valve body 900 is arranged on the first connection pipe, a second valve body 901 is arranged on the second connection pipe, and a third valve body 902 is arranged between the connection part of the first connection pipe and the water inlet pipe of the condenser 100 and the connection part of the second connection pipe and the water inlet pipe of the condenser 100; when the water temperature of the cooling side unit is lower than the minimum starting temperature value of the unit and the water temperature in the water supply tank 300 is higher than the minimum starting temperature value of the unit, the first valve body 900 and the second valve body 901 are controlled to be opened, the third valve body 902 is closed, the water discharged from the cooling tower 500 flows to the water supply tank 300 through the first connecting pipe under the driving of the cooling water pump 600, and the water discharged from the water supply tank 300 is guided to the condenser 100 through the second connecting pipe.
The third connecting pipeline and the fourth connecting pipeline are both connected with the water outlet pipeline of the evaporator 200 and the water supply tank 300, valve bodies are arranged on the third connecting pipeline and the fourth connecting pipeline, the fourth valve body 903 is arranged on the third connecting pipeline, the fifth valve body 904 is arranged on the fourth connecting pipeline, and the sixth valve body 905 is arranged between the connecting part of the third connecting pipeline and the water outlet pipeline of the evaporator 200 and the connecting part of the fourth connecting pipeline and the water outlet pipeline of the evaporator 200. When the temperature of the chilled water discharged from the evaporator 200 is higher than the set temperature of the water supply tank and the temperature of the water supply tank 300 is lower than the set temperature of the water supply tank, the fourth valve body 903 and the fifth valve body 904 are opened, the sixth valve body 905 is closed, and under the action of the chilled water pump 700, the water discharged from the evaporator 200 flows to the water supply tank 300 through the third connecting pipe, and the water discharged from the water supply tank 300 is guided to the indoor heat exchange pipe through the third connecting pipe so as to raise the temperature of the water of the cooling side unit; when the water temperature of the water supply tank 300 is not lower than the water supply tank set temperature or the chilled side drain water temperature is not higher than the water supply tank set temperature, the fourth valve body 903 and the fifth valve body 904 are closed, the sixth valve body 905 is opened, and the water discharged from the evaporator 200 is controlled to directly flow to the indoor piping without passing through the water supply tank 300.
The fifth connecting pipeline and the sixth connecting pipeline are both connected with the water outlet pipeline of the condenser 100 and the backwater water tank 400, valve bodies are arranged on the fifth connecting pipeline and the sixth connecting pipeline, a seventh valve body 906 is arranged on the fifth connecting pipeline, an eighth valve body 907 is arranged on the sixth connecting pipeline, and a ninth valve body 908 is arranged between the connection part of the fifth connecting pipeline and the water outlet pipeline of the condenser 100 and the connection part of the sixth connecting pipeline and the water outlet pipeline of the condenser 100; when the cooling side drainage temperature is greater than the backwater water tank set temperature and the water temperature of the backwater water tank 400 is lower than the backwater water tank set temperature, the seventh valve body 906 and the eighth valve body 907 are opened, the ninth valve body 908 is closed, and the water discharged from the condenser 100 flows to the backwater water tank 400 through the fifth connecting pipeline under the driving of the cooling water pump 600, and the water discharged from the backwater water tank 400 is guided to the cooling tower 500 through the sixth connecting pipeline; when the cooling side drain temperature is not greater than the return water tank set temperature or the return water tank 400 temperature is not lower than the return water tank set temperature, the seventh valve body 906 and the eighth valve body 907 are closed, and the ninth valve body 908 is opened, and the water discharged from the condenser 100 is controlled to directly flow to the cooling tower 500 without passing through the return water tank 400 under the driving of the cooling water pump 600.
Referring to fig. 2, a seventh connection pipe 800 and an eighth connection pipe 801 are illustrated, the seventh connection pipe 800 and the eighth connection pipe 801 are connected to the backwater tank 400, a tenth valve body 909 is provided on the seventh connection pipe 800, an eleventh valve body 910 is provided on the eighth connection pipe 801, the eighth connection pipe 801 is connected to the backwater pipes of the two evaporators 200, and referring to fig. 2, the twelfth valve body 911 and the thirteenth valve body 912 are illustrated. When the freezing-side backwater temperature is less than the shutdown set temperature, the tenth valve body 909 and the eleventh valve body 910 are opened, the twelfth valve body 911 and the thirteenth valve body 912 are closed, and the water discharged from the indoor cooling pipe flows to the backwater tank 400 through the seventh connection pipe 800 under the driving of the chilled water pump 700, and the water in the backwater tank 400 flows to the water inlet pipes of the two evaporators 200 through the eighth connection pipe 801, respectively; when the freezing-side return water temperature is not less than the stop setting temperature or the freezing-side return water temperature is not less than the water temperature of the return water tank 400, the tenth valve body 909 and the eleventh valve body 910 are closed, the twelfth valve body 911 and the thirteenth valve body 912 are opened, and the water discharged from the indoor cooling pipe is controlled to directly flow to the evaporator 200 without passing through the return water tank 400 under the driving of the chilled water pump 700.
A control device of a central air conditioning water system, comprising: the collecting module is used for collecting and improving parameters of the water temperature condition of the cooling side unit and collecting and improving parameters of the water temperature condition of the freezing side return unit; the judging module is used for judging whether the parameters meet the condition of improving the water temperature of the cooling side unit and the condition of improving the water temperature of the freezing side return unit and sending a control instruction; the adjusting module is used for receiving the control instruction, and can adjust the condenser 100 for discharging the mixed chilled water and cooling water to the central air-conditioning water system unit, and the evaporator 200 for discharging the mixed chilled water and cooling water to the central air-conditioning water system unit.
The control device also comprises a mixing and collecting module for collecting the temperature parameter of the chilled water and the temperature parameter of the cooling water; the mixing collection module is connected with the judging module, the judging module can judge whether the chilled water meets the condition of mixing with the cooling tower drainage and judge whether the cooling water meets the mixing condition of returning water on the freezing side of the unit, and can send a control instruction to the adjusting module so as to mix the chilled water with the cooling tower drainage and mix the cooling water with the returning water on the freezing side of the unit.
A water supply tank 300 is provided between the drain pipe of the evaporator 200 and the water inlet pipe of the condenser 100; the collecting module comprises a cooling side inlet unit water temperature sensor and a water supply water tank water temperature sensor, the mixing collecting module comprises a freezing side outlet unit water temperature sensor, and the cooling side inlet unit water temperature sensor, the freezing side outlet unit water temperature sensor and the water supply water tank water temperature sensor are all connected with the judging module. The cooling side unit water temperature sensor is used for detecting the temperature of cooling side unit water, the freezing side unit water temperature sensor is used for detecting the temperature of freezing side unit water, the water supply tank water temperature sensor is used for detecting the water temperature in the water supply tank, the cooling side unit water temperature sensor, the freezing side unit water temperature sensor and the water supply tank water temperature sensor can convey detected signal parameters to the judging module, the judging module can control the adjusting module, namely the valve body on the central air-conditioning water system according to relevant parameters, so that when the condition of improving the cooling side unit water temperature is met, the valve body on-off state on a pipeline is changed, mixed cooling tower drainage and unit freezing side drainage are led to the condenser 100 of the unit, when the unit freezing side drainage meets the condition of mixing with the cooling tower drainage, the valve body on-off state on the pipeline is changed, and the unit freezing side drainage is led to the water supply tank 300, so that the condition that the cooling side drainage cannot be started due to low cooling water temperature is improved.
A backwater tank 400 is arranged between a water inlet pipeline of the evaporator 200 and a water outlet pipeline of the condenser 100; the collecting module comprises a cooling side outlet unit water temperature sensor and a backwater water tank water temperature sensor, the mixing collecting module comprises a freezing side return unit water temperature sensor, and the cooling side outlet unit water temperature sensor, the freezing side return unit water temperature sensor and the backwater water tank water temperature sensor are all connected with the judging module. The cooling side water temperature sensor of the cooling side water outlet unit is used for detecting the temperature of cooling side water outlet unit, the freezing side water temperature sensor of the freezing side water return unit is used for detecting the temperature of freezing side water return unit, the water return water tank water temperature sensor is used for detecting the temperature of water in the water return water tank, the cooling side water temperature sensor of the cooling side water outlet unit, the freezing side water temperature sensor of the freezing side water return unit and the water return water tank water temperature sensor convey detected signal parameters to the judging module, the judging module can control the adjusting module, namely the valve body on the central air-conditioning water system according to related parameters, so that when the water temperature condition of the freezing side water return unit is improved, the valve body on-off state of a pipeline is changed, mixed unit cooling side drainage and unit freezing side water return are led to the evaporator 200 of the unit, when cooling water meets the condition of mixing with the freezing side water return, the valve body on-off state of the pipeline is changed, and the unit cooling side drainage is controlled to the water return tank 400 so as to be used for improving the condition of frequent start-stop caused by low water return temperature of the freezing water.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The working control method of the central air conditioner water system is characterized by comprising the following steps:
judging whether the condition of improving the water temperature of the cooling side unit is met, if so, guiding the mixed chilled water and cooling tower drain water to a condenser (100) of the unit for improving the water temperature of the cooling side unit, wherein the chilled water is evaporator side drain water;
when the water temperature of the cooling side unit is lower than the minimum starting temperature value of the unit and the water temperature of the mixed chilled water and cooling tower drainage is higher than the minimum starting temperature value of the unit, judging that the condition of improving the water temperature of the cooling side unit is met;
when the water temperature of the chilled water is larger than a first mixing set temperature value and the water temperature of the mixed chilled water and cooling tower drainage is lower than the first mixing set temperature value, judging that the chilled water meets the condition of mixing with the cooling tower drainage;
A water supply tank (300) is arranged between a water discharge pipeline of the evaporator (200) and a water inlet pipeline of the condenser (100), or a water supply tank (300) is arranged between a water return pipeline of the evaporator (200) and a water inlet pipeline of the condenser (100) so as to be used for discharging the mixed chilled water and cooling tower;
when the condition of increasing the water temperature of the cooling side unit is satisfied, controlling water discharged from the cooling tower (500) to flow to the water supply tank (300) and guiding water discharged from the water supply tank (300) to the condenser (100);
when the water temperature of the cooling side unit is not lower than the minimum starting temperature value of the unit, controlling the water discharged from the cooling tower (500) to directly flow to the condenser (100) without passing through the water supply tank (300);
when the freezing side drainage meets the condition of mixing with the cooling tower drainage, controlling the water discharged by the evaporator (200) to flow to the water supply tank (300) and guiding the water discharged by the water supply tank (300) to an indoor heat exchange pipeline;
when the water temperature of the water supply tank (300) is not lower than the first mixing set temperature value or the water temperature of the cold-side drain water is not higher than the first mixing set temperature value, controlling water discharged from the evaporator (200) to directly flow to an indoor heat exchange pipeline without passing through the water supply tank (300).
2. The method according to claim 1, characterized in that it judges whether or not a condition for increasing the water temperature of the refrigerating side return unit is satisfied, and if so, the mixed cooling water and the refrigerating side return water of the unit are led to an evaporator (200) of the unit, wherein the cooling water is condenser side drain water.
3. The method according to claim 2, wherein when the temperature of the return water on the freezing side is lower than the set temperature for shutdown and the temperature of the return water on the freezing side is lower than the water temperature of the mixed cooling water and return water on the freezing side of the unit, it is judged that the condition for raising the water temperature of the return water on the freezing side is satisfied.
4. The method according to claim 3, wherein when the temperature of the cooling water is higher than a second mixing set temperature value and the temperature of the cooling water mixed with the return water on the freezing side of the unit is lower than the second mixing set temperature value, it is judged that the cooling water satisfies the condition of mixing with the return water on the freezing side.
5. The method according to claim 4, characterized in that a backwater water tank (400) is provided between the water intake pipe of the evaporator (200) and the water discharge pipe of the condenser (100) or a backwater water tank (400) is provided between the water intake pipe of the evaporator (200) and the water intake pipe of the condenser (100) for mixing the cooling water and the return water of the refrigerating side of the machine unit.
6. The operation control method of a central air conditioner water system according to claim 5, wherein when a condition for increasing the water temperature of the refrigerating side-return unit is satisfied, controlling water discharged from the indoor cooling pipe to flow to the return water tank (400) and guiding water discharged from the return water tank (400) to the evaporator (200);
when the return water temperature at the freezing side is not less than the shutdown set temperature, controlling water discharged from the indoor cooling pipe to directly flow to the evaporator (200) without passing through the return water tank (400);
when the cooling side drainage meets the condition of mixing with the freezing side backwater, controlling the water discharged by the condenser (100) to flow to the backwater water tank (400) and guiding the water discharged by the backwater water tank (400) to the cooling tower (500);
when the cooling side drainage temperature is not more than the second mixing set temperature value or the water temperature in the backwater water tank (400) is not less than the second mixing set temperature value, controlling the water discharged from the condenser (100) to directly flow to the cooling tower (500) without passing through the backwater water tank (400).
7. A central air-conditioning water system for implementing the operation control method of the central air-conditioning water system as claimed in any one of claims 1 to 6, characterized by comprising a water supply tank (300), the water supply tank (300) being connected to a water discharge pipe of the evaporator (200) and a water intake pipe of the condenser (100) through a pipe or the water supply tank (300) being connected to a water intake pipe of the evaporator (200) and a water intake pipe of the condenser (100) through a pipe for enabling mixing of the chilled water and cooling tower water discharge when changing a valve body on-off state on the pipe;
And/or the water return device comprises a water return water tank (400), wherein the water return water tank (400) is connected with a water inlet pipeline of the evaporator (200) and a water outlet pipeline of the condenser (100) through pipelines or the water return water tank (400) is connected with the water inlet pipeline of the evaporator (200) and the water inlet pipeline of the condenser (100) through pipelines, so that the mixing of cooling water and return water on the refrigerating side of the unit can be realized when the on-off state of a valve body on the pipelines is changed.
8. A control device of a central air-conditioning water system operation control method as claimed in any one of claims 1 to 6, comprising:
the collecting module is used for collecting and improving parameters of the water temperature condition of the cooling side unit and/or collecting and improving parameters of the water temperature condition of the freezing side return unit;
the judging module is used for judging whether the parameters meet the condition of improving the water temperature of the cooling side unit and/or meet the condition of improving the water temperature of the freezing side return unit and can issue a control instruction;
the adjusting module is used for receiving the control instruction of the judging module so as to guide the mixed chilled water and cooling tower drainage to a condenser (100) of the central air-conditioning water system unit and/or guide the mixed chilled water and unit chilled side return water to an evaporator (200) of the central air-conditioning water system unit.
9. The control device according to claim 8, further comprising a mixing and collecting module for collecting a temperature parameter of the chilled water and/or a temperature parameter of the cooling water; the mixing and collecting module is connected with the judging module, the judging module can judge whether the chilled water meets the condition of mixing with the cooling tower drainage and/or judge whether the cooling water meets the mixing condition of returning water at the freezing side of the unit, and can send a control instruction to the adjusting module so that the chilled water is mixed with the cooling tower drainage and/or so that the cooling water is mixed with the returning water at the freezing side of the unit.
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| DE4424870A1 (en) * | 1994-07-14 | 1996-01-18 | Saarbergwerke Ag | Process for improving efficiency in thermal power plants with condensers connected in series on the cooling water side |
| CN101089503A (en) * | 2007-07-06 | 2007-12-19 | 北京时代嘉华环境控制科技有限公司 | Quality and regulation control method and system for chill station of central air conditioner |
| CN211290630U (en) * | 2019-10-12 | 2020-08-18 | 上海方瑄机械设备有限公司 | Water source cold and hot water unit test device |
| CN113588315A (en) * | 2021-08-31 | 2021-11-02 | 广州市华德工业有限公司 | Synthesize hot and cold water unit test system |
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