CN111623433A - Central air-conditioning cold and hot station operation system and operation method thereof - Google Patents
Central air-conditioning cold and hot station operation system and operation method thereof Download PDFInfo
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- CN111623433A CN111623433A CN202010408798.9A CN202010408798A CN111623433A CN 111623433 A CN111623433 A CN 111623433A CN 202010408798 A CN202010408798 A CN 202010408798A CN 111623433 A CN111623433 A CN 111623433A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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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
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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
- F24F11/70—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
- F24F11/70—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
- F24F11/85—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 variable-flow pumps
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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
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Abstract
The invention discloses a central air-conditioning cold and hot station operation system and an operation method thereof, relates to the technical field of central air-conditioning, and aims to solve the problems that in the prior art, the central air-conditioning system is extremely high in electric energy consumption required by operation, most of the central air-conditioning systems are provided with energy-saving settings, but cannot be set in a changing way according to real-time use conditions. The cooling air tower is connected with the cooling water pump in series through a pipeline, the cooling water pump is connected with the first water chilling unit and the second water chilling unit in parallel through pipelines, the first water chilling unit and the second water chilling unit are connected with the chilled water pump in parallel through pipelines, the chilled water pump is connected with the plate heat exchanger in series through pipelines, the plate heat exchanger is connected with the heat storage water tank, the heat release circulating pump and the heat storage electric boiler in parallel through pipelines, the heat storage water tank is connected with the softened water module in series through pipelines, the heat storage water tank is connected with the heat release circulating pump and the heat storage circulating pump in parallel through pipelines, and the heat release circulating pump and the heat storage circulating pump are connected with the heat storage.
Description
Technical Field
The invention relates to the technical field of central air conditioners, in particular to a central air conditioner cold and hot station operation system and an operation method thereof.
Background
The central air conditioning system is composed of one or more cold and heat source systems and a plurality of air conditioning systems, and the system is different from the traditional refrigerant type air conditioner, and the air is intensively treated (such as a single machine, VRV) to achieve the comfort requirement. The principle of liquid gasification refrigeration is adopted to provide the required cold energy for the air conditioning system so as to offset the heat load of the indoor environment; the heating system provides heat required by the air conditioning system to offset the cold and warm load of the indoor environment, the refrigerating system is a vital part of the central air conditioning system, and the type, the operation mode, the structural form and the like of the refrigerating system directly influence the economical efficiency, the high efficiency and the reasonability of the central air conditioning system in operation.
However, the existing central air-conditioning system consumes a lot of electric energy for operation, and most of the central air-conditioning systems have energy-saving settings, but cannot be set variably according to real-time use conditions; therefore, the existing requirements are not met, and a central air-conditioning cold and hot station operation system and an operation method thereof are provided for the system.
Disclosure of Invention
The invention aims to provide a central air-conditioning cold and hot station operation system and an operation method thereof, which aim to solve the problems that the central air-conditioning system provided by the background technology needs extremely high electric energy consumption for operation, and most central air-conditioning systems have energy-saving settings but cannot be set in a changing way according to real-time use conditions.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a cold and hot station operating system of central air conditioning, includes the cooling air tower, the cooling air tower passes through the pipeline with cooling water pump and establishes ties, and cooling water pump and first cooling water set and second cooling water set pass through the pipeline parallelly connected, first cooling water set and second cooling water set pass through the pipeline parallelly connected with the refrigerated water pump, the refrigerated water pump passes through the pipeline with plate heat exchanger and establishes ties, and plate heat exchanger passes through the pipeline parallelly connected with heat storage water tank, heat release circulating pump and heat accumulation electric boiler, heat storage water tank passes through the pipeline with the demineralized water module and establishes ties, and heat storage water tank passes through the pipeline parallelly connected with heat release circulating pump and heat accumulation circulating pump, heat release circulating pump and heat accumulation circulating pump pass through the pipeline parallelly connected with heat accumulation electric boiler.
Preferably, the first water chilling unit and the second water chilling unit are of water-cooling screw type structures, and electromagnetic valves are arranged inside the connecting pipelines.
A method for operating a central air-conditioning cold and hot station comprises the following steps:
step one, during refrigeration, designing a supply and return water temperature of chilled water to be 7/12 ℃, starting a host, operating a refrigerating pump frequently when the supply water temperature of the chilled water is higher than a set value plus 1 ℃, monitoring the differential pressure of a main supply and return water pipe of the chilled water after the refrigerating pump is started, controlling the opening of a bypass electric regulating valve in a PID mode, setting a limit value of the supply and return water differential pressure, increasing the opening of an electric valve when the limit value is higher than the set value, and reducing the opening of the electric valve when the limit value is lower than the set value, wherein the maximum opening of;
step two, the design temperature of cooling water supply and return water is 32/37 ℃, the cooling water return water temperature is higher than 32 ℃, the cooling pump operates under power frequency, the outlet water temperature of the cooling water is higher than 37 ℃, and the cooling pump operates under power frequency when the exhaust pressure of the host is higher than 1400 kPa;
before the host computer is started, starting the fans of the cooling tower one minute in advance, delaying to close all the fans of the cooling tower one minute after the host computer is shut down, wherein the set value of the outlet water temperature of the cooling tower is the outdoor wet bulb temperature plus 3 ℃, and the outlet water temperature is not lower than 26 ℃;
step four, operating a single water-cooling main machine, wherein the loading rate of the water-cooling main machine is lower than a set value, the temperature difference between the chilled water supply temperature and the chilled water supply return temperature is lower than 3 ℃ when the chilled water supply temperature is lower than the set value and 1 ℃, stopping the water-cooling main machine after delaying for five minutes, stopping a cooling tower fan after delaying for one minute, stopping a cooling water pump after delaying for five minutes, and continuously operating the chilled water pump at the frequency of 45 Hz;
step five, during heating, the design temperature of hot water supply and return water of the air conditioner in winter is 45/40 ℃, the water supply temperature of hot water is stabilized within the range of 45 +/-2 ℃, and after supply and demand are balanced, the hot water pump carries out frequency conversion adjustment according to the temperature difference of the supply and return water of the hot water, and the temperature difference of the supply and return water is maintained between 5 ℃;
controlling the opening degrees of a heat release circulating pump and a primary side bypass adjusting valve according to the water supply temperature and the water supply and return temperature difference of the heat supply pipeline, and monitoring the temperature of the primary side and the secondary side supply and return pipelines of the plate heat exchanger in real time;
step seven, when the temperature of the outlet water of the heating pipeline is higher than 45 ℃, preferentially adjusting the frequency of the heat release circulating pump in a PID mode until the frequency of the water pump reaches 35Hz, and starting to increase the opening of an electric adjusting valve on the primary side bypass pipeline;
step eight, when the temperature of the outlet water of the heating pipeline is lower than 43 ℃, preferentially reducing the opening degree of an electric control valve on a primary side bypass pipe in a PID mode, and increasing the running frequency of a water pump when the electric control valve is closed and does not achieve the effect;
step nine, when the temperature of the water supply of the heating pipeline reaches a set temperature range, the temperature difference of the water supply and return is less than 3 ℃, and the duration time exceeds ten minutes, reducing the operating frequency of the heating water pump in a PID mode; the temperature difference of the water supply and the water return is more than 5 ℃, the duration time exceeds five minutes, and the operation frequency of the heating circulating pump is increased in a PID mode;
and step ten, monitoring the liquid level of the heat storage water tank in real time by the system, starting the water supplementing electric valve when the detected liquid level is smaller than the lower limit value, and stopping supplementing water when the detected liquid level reaches the upper limit value of the liquid level.
Preferably, in the first step, the number of the started refrigerating water pumps is the same as the number of the main machines under normal conditions, and if the temperature of the supplied chilled water is lower than a set value +1 ℃, the temperature difference of the supplied and returned water is lower than 4 ℃, and the air conditioner at the end of the unfavorable end does not meet the requirement, the number of the started refrigerating water pumps is 1 more than the number of the started main machines.
Preferably, in the second step, the temperature of the wet bulb in the outdoor environment is higher than 28 ℃ or the return water temperature of the cooling water is higher than 30 ℃, the water supply temperature of the chilled water is higher than 12 ℃, and the host machine can be continuously loaded and operated.
Preferably, in the third step, if it is detected that the exhaust pressure of the main engine exceeds 1400kPa, the cooling tower fans are fully opened, and if the exhaust pressure is lower than 1200kPa, the cooling tower fans are fully closed, and at least one fan is opened between the lower limit value and the upper limit value.
Preferably, in the fifth step, when the operating pressure of the hot water pipe network exceeds 6bar, the system automatically alarms, and the interlocking shutdown is operated at the same time.
Preferably, in the step ten, when the liquid level of the water tank is lower than a set value, the valve is opened, when the liquid level of the water tank is higher than the set value, the valve is closed, and when the liquid level of the water tank is lower than the lowest limit value, the system sends out a water tank liquid level alarm.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention realizes the cold quantity supply and demand balance control between the cold station and the tail end in the whole air-conditioning system operation, realizes the optimal energy-saving control of the central air-conditioning system, meets the requirements of energy saving and comfort of the air-conditioning system, determines the operation time of the refrigeration system according to the working time period of a building, realizes the control of starting and stopping at fixed time, and meets the following policy requirements, setting office time of a building according to actual conditions, setting chilled water supply temperature to be between 7 and 12 ℃, starting a system before work to prepare air conditioner cold water, comprehensively considering parameters such as ambient temperature and chilled water capacity when starting the system in advance, closing the system before work, keeping office air conditioner demands by using pipelines and building residual cold, considering parameters such as ambient temperature and chilled water pipe capacity when shutting down the system in advance, meanwhile, the working time period of the building can be a cycle every week, and the office time can be independently set from Monday to Sunday every day.
Drawings
FIG. 1 is a flow chart of the overall system control 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.
Referring to fig. 1, an embodiment of the present invention: a central air conditioning cold and hot station operation system comprises a cooling air tower, wherein the cooling air tower is connected with a cooling water pump in series through a pipeline, the cooling water pump is connected with a first water chilling unit and a second water chilling unit in parallel through pipelines, the first water chilling unit and the second water chilling unit are connected with a chilled water pump in parallel through pipelines, the chilled water pump is connected with a plate heat exchanger in series through a pipeline, the plate heat exchanger is connected with a heat storage water tank, a heat release circulating pump and a heat storage electric boiler in parallel through pipelines, the heat storage water tank is connected with a softened water module in series through a pipeline, the heat storage water tank is connected with the heat release circulating pump and the heat storage circulating pump in parallel through pipelines, and the heat release circulating pump and the heat.
Furthermore, the first water chilling unit and the second water chilling unit are of water-cooling screw type structures, and electromagnetic valves are arranged inside the connecting pipelines, so that remote control operation is facilitated.
A method for operating a central air-conditioning cold and hot station comprises the following steps:
step one, during refrigeration, the design supply and return water temperature of chilled water is 7/12 ℃, a host is started, and when the supply water temperature of the chilled water is higher than a set value plus 1 ℃, a refrigerating pump operates frequently;
step two, the design temperature of cooling water supply and return water is 32/37 ℃, the cooling water return water temperature is higher than 32 ℃, the cooling pump operates under power frequency, the outlet water temperature of the cooling water is higher than 37 ℃, and the cooling pump operates under power frequency when the exhaust pressure of the host is higher than 1400 kPa;
before the host computer is started, starting the fans of the cooling tower one minute in advance, delaying to close all the fans of the cooling tower one minute after the host computer is shut down, wherein the set value of the outlet water temperature of the cooling tower is the outdoor wet bulb temperature plus 3 ℃, and the outlet water temperature is not lower than 26 ℃;
step four, operating a single water-cooling main machine, wherein the loading rate of the water-cooling main machine is lower than a set value, the temperature difference between the chilled water supply temperature and the chilled water supply return temperature is lower than 3 ℃ when the chilled water supply temperature is lower than the set value and 1 ℃, stopping the water-cooling main machine after delaying for five minutes, stopping a cooling tower fan after delaying for one minute, stopping a cooling water pump after delaying for five minutes, and continuously operating the chilled water pump at the frequency of 45 Hz;
step five, during heating, the design temperature of hot water supply and return water of the air conditioner in winter is 45/40 ℃, the water supply temperature of hot water is stabilized within the range of 45 +/-2 ℃, and after supply and demand are balanced, the hot water pump carries out frequency conversion adjustment according to the temperature difference of the supply and return water of the hot water, and the temperature difference of the supply and return water is maintained between 5 ℃;
controlling the opening degrees of a heat release circulating pump and a primary side bypass adjusting valve according to the water supply temperature and the water supply and return temperature difference of the heat supply pipeline, and monitoring the temperature of the primary side and the secondary side supply and return pipelines of the plate heat exchanger in real time;
step seven, when the temperature of the outlet water of the heating pipeline is higher than 45 ℃, preferentially adjusting the frequency of the heat release circulating pump in a PID mode until the frequency of the water pump reaches 35Hz, and starting to increase the opening of an electric adjusting valve on the primary side bypass pipeline;
step eight, when the temperature of the outlet water of the heating pipeline is lower than 43 ℃, preferentially reducing the opening degree of an electric control valve on a primary side bypass pipe in a PID mode, and increasing the running frequency of a water pump when the electric control valve is closed and does not achieve the effect;
step nine, when the temperature of the water supply of the heating pipeline reaches a set temperature range, the temperature difference of the water supply and return is less than 3 ℃, and the duration time exceeds ten minutes, reducing the operating frequency of the heating water pump in a PID mode; the temperature difference of the water supply and the water return is more than 5 ℃, the duration time exceeds five minutes, and the operation frequency of the heating circulating pump is increased in a PID mode;
and step ten, monitoring the liquid level of the heat storage water tank in real time by the system, starting the water supplementing electric valve when the detected liquid level is smaller than the lower limit value, and stopping supplementing water when the detected liquid level reaches the upper limit value of the liquid level.
Further, in the first step, the number of the started refrigerating water pumps is consistent with the number of the main machines under normal conditions, if the temperature of the supplied chilled water is lower than a set value +1 ℃, the temperature difference of the supplied and returned water is lower than 4 ℃, and the air conditioner at the tail end of the unfavorable end still cannot meet the requirement, the number of the started refrigerating water pumps is 1 more than the number of the started main machines.
Further, in the second step, the temperature of the outdoor environment wet bulb is higher than 28 ℃ or the return water temperature of the cooling water is higher than 30 ℃, the water supply temperature of the chilled water is higher than 12 ℃, and the host machine can be continuously loaded and operated, so that intelligent automatic management and control are realized.
Further, in the third step, if the exhaust pressure of the main unit is detected to exceed 1400kPa, the cooling tower fans are fully opened, and when the exhaust pressure is lower than 1200kPa, the cooling tower fans are fully closed, and at least one fan is opened between the lower limit value and the upper limit value, so that the normal operation of the air conditioner is guaranteed.
Furthermore, in the fifth step, when the operating pressure of the hot water pipe network exceeds 6bar, the system can automatically alarm, and meanwhile, the system can be operated to shut down in a linkage manner, so that the overall safety of the device is improved, and the situation that the water pipe is broken due to overlarge pressure is avoided.
Further, in the tenth step, when the water tank liquid level is less than the setting value, the valve is opened, when the water tank liquid level is higher than the setting value, the valve is closed, when the water tank liquid level is less than the minimum limit value, the system will send the water tank liquid level and report to the police, the warning staff that can be timely opens the water supply pipeline and supplies water.
The working principle is as follows: when the refrigerating system is used, during refrigeration, the design temperature of chilled water supply and return water is 7/12 ℃, the main machine is started, when the temperature of the chilled water supply and return water is more than a set value and +1 ℃, the working frequency of a refrigerating pump is operated, the design temperature of cooling water supply and return water is 32/37 ℃, the temperature of cooling water return water is higher than 32 ℃, the cooling pump is operated at power frequency, when the exhaust pressure of the main machine is higher than 1400kPa, the cooling pump is operated at power frequency, before the main machine is started, cooling tower fans are started one minute in advance, all cooling tower fans are shut down one minute after the main machine is shut down, the set value of the temperature of the cooling tower outlet water is outdoor wet bulb temperature +3 ℃ and is not lower than 26 ℃, when the single water-cooling main machine is operated, the loading rate of the single water-cooling main machine is lower than the set value, the temperature of the chilled water supply and return, after delaying for one minute, stopping a cooling tower fan, after delaying for five minutes, stopping a cooling water pump, continuously operating a freezing water pump at a frequency of 45Hz, when heating, carrying out frequency conversion regulation on a hot water supply and return water temperature difference of an air conditioner in winter at 45/40 ℃ and keeping the hot water supply temperature within a range of 45 +/-2 ℃, after supply and demand are balanced, carrying out frequency conversion regulation on the hot water pump according to the hot water supply and return water temperature difference, keeping the water supply and return water temperature difference between 5 ℃, controlling the opening degree of a heat release circulating pump and a primary side regulating valve bypass according to the water supply temperature and the water supply and return temperature difference of a heat supply pipeline, monitoring the temperature of a primary side supply and a secondary side supply and return pipeline of a plate heat exchanger in real time, when the temperature of the outlet water of a heating pipeline is higher than 45 ℃, preferentially regulating the frequency of the heat release circulating pump in a PID mode until the frequency of the water pump reaches 35Hz, starting, preferentially reducing the opening degree of an electric control valve on a primary side bypass pipe in a PID mode, increasing the running frequency of a water pump when the electric control valve is still not effective when closed, and reducing the running frequency of the heating water pump in the PID mode when the temperature of the water supply of a heating pipeline reaches a set temperature range, the temperature difference of the water supply and return is less than 3 ℃ and the duration time exceeds ten minutes; the temperature difference of the water supply and return is larger than 5 ℃, the duration time exceeds five minutes, the operation frequency of the heating circulating pump is increased in a PID mode, the system monitors the liquid level of the heat storage water tank in real time, when the liquid level is detected to be smaller than the lower limit value, the water supplementing electric valve is started, and when the liquid level reaches the upper limit value, the water supplementing is stopped.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. The utility model provides a cold and hot station operating system of central air conditioning, includes cooling wind tower, its characterized in that: the cooling air tower is connected with the cooling water pump in series through a pipeline, the cooling water pump is connected with the first water chilling unit and the second water chilling unit in parallel through pipelines, the first water chilling unit and the second water chilling unit are connected with the chilled water pump in parallel through pipelines, the chilled water pump is connected with the plate heat exchanger in series through pipelines, the plate heat exchanger is connected with the heat storage water tank, the heat release circulating pump and the heat storage electric boiler in parallel through pipelines, the heat storage water tank is connected with the softened water module in series through pipelines, the heat storage water tank is connected with the heat release circulating pump and the heat storage circulating pump in parallel through pipelines, and the heat release circulating pump and the heat storage circulating pump are connected with the heat storage.
2. A central air conditioning cold and hot station operation system as claimed in claim 1, wherein: the first water chilling unit and the second water chilling unit are of water-cooling screw type structures, and electromagnetic valves are arranged inside the connecting pipelines.
3. A method for operating a cold and hot station of a central air conditioner is characterized by comprising the following steps:
step one, during refrigeration, the design supply and return water temperature of chilled water is 7/12 ℃, a host is started, and when the supply water temperature of the chilled water is higher than a set value plus 1 ℃, a refrigerating pump operates frequently;
step two, the design temperature of cooling water supply and return water is 32/37 ℃, the cooling water return water temperature is higher than 32 ℃, the cooling pump operates under power frequency, the outlet water temperature of the cooling water is higher than 37 ℃, and the cooling pump operates under power frequency when the exhaust pressure of the host is higher than 1400 kPa;
before the host computer is started, starting the fans of the cooling tower one minute in advance, delaying to close all the fans of the cooling tower one minute after the host computer is shut down, wherein the set value of the outlet water temperature of the cooling tower is the outdoor wet bulb temperature plus 3 ℃, and the outlet water temperature is not lower than 26 ℃;
step four, operating a single water-cooling main machine, wherein the loading rate of the water-cooling main machine is lower than a set value, the temperature difference between the chilled water supply temperature and the chilled water supply return temperature is lower than 3 ℃ when the chilled water supply temperature is lower than the set value and 1 ℃, stopping the water-cooling main machine after delaying for five minutes, stopping a cooling tower fan after delaying for one minute, stopping a cooling water pump after delaying for five minutes, and continuously operating the chilled water pump at the frequency of 45 Hz;
step five, during heating, the design temperature of hot water supply and return water of the air conditioner in winter is 45/40 ℃, the water supply temperature of hot water is stabilized within the range of 45 +/-2 ℃, and after supply and demand are balanced, the hot water pump carries out frequency conversion adjustment according to the temperature difference of the supply and return water of the hot water, and the temperature difference of the supply and return water is maintained between 5 ℃;
controlling the opening degrees of a heat release circulating pump and a primary side bypass adjusting valve according to the water supply temperature and the water supply and return temperature difference of the heat supply pipeline, and monitoring the temperature of the primary side and the secondary side supply and return pipelines of the plate heat exchanger in real time;
step seven, when the temperature of the outlet water of the heating pipeline is higher than 45 ℃, preferentially adjusting the frequency of the heat release circulating pump in a PID mode until the frequency of the water pump reaches 35Hz, and starting to increase the opening of an electric adjusting valve on the primary side bypass pipeline;
step eight, when the temperature of the outlet water of the heating pipeline is lower than 43 ℃, preferentially reducing the opening degree of an electric control valve on a primary side bypass pipe in a PID mode, and increasing the running frequency of a water pump when the electric control valve is closed and does not achieve the effect;
step nine, when the temperature of the water supply of the heating pipeline reaches a set temperature range, the temperature difference of the water supply and return is less than 3 ℃, and the duration time exceeds ten minutes, reducing the operating frequency of the heating water pump in a PID mode; the temperature difference of the water supply and the water return is more than 5 ℃, the duration time exceeds five minutes, and the operation frequency of the heating circulating pump is increased in a PID mode;
and step ten, monitoring the liquid level of the heat storage water tank in real time by the system, starting the water supplementing electric valve when the detected liquid level is smaller than the lower limit value, and stopping supplementing water when the detected liquid level reaches the upper limit value of the liquid level.
4. A central air conditioning cold and hot station operation method as claimed in claim 3, characterized in that: in the first step, the number of the started refrigerating water pumps is consistent with the number of the main machines under normal conditions, if the temperature of the supplied chilled water is lower than a set value +1 ℃, the temperature difference of the supplied and returned water is lower than 4 ℃, and the air conditioner at the tail end of the unfavorable end cannot meet the requirement, the number of the started refrigerating water pumps is 1 more than the number of the started main machines.
5. A central air conditioning cold and hot station operation method as claimed in claim 3, characterized in that: in the second step, the temperature of the outdoor environment wet bulb is higher than 28 ℃ or the return water temperature of the cooling water is higher than 30 ℃, the water supply temperature of the chilled water is higher than 12 ℃, and the host machine can be continuously loaded and operated.
6. A central air conditioning cold and hot station operation method as claimed in claim 3, characterized in that: in the third step, if the exhaust pressure of the main engine is detected to exceed 1400kPa, the cooling tower fans are fully opened, and when the exhaust pressure is lower than 1200kPa, the cooling tower fans are fully closed, and at least one fan is opened between the lower limit value and the upper limit value.
7. A central air conditioning cold and hot station operation method as claimed in claim 3, characterized in that: in the fifth step, when the operating pressure of the hot water pipe network exceeds 6bar, the system automatically alarms, and meanwhile, the interlocking shutdown is operated.
8. A central air conditioning cold and hot station operation method as claimed in claim 3, characterized in that: in the step ten, when the liquid level of the water tank is lower than a set value, the valve is opened, when the liquid level of the water tank is higher than the set value, the valve is closed, and when the liquid level of the water tank is lower than a lowest limit value, the system sends out a water tank liquid level alarm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010408798.9A CN111623433A (en) | 2020-05-14 | 2020-05-14 | Central air-conditioning cold and hot station operation system and operation method thereof |
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| CN202010408798.9A CN111623433A (en) | 2020-05-14 | 2020-05-14 | Central air-conditioning cold and hot station operation system and operation method thereof |
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Cited By (3)
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| CN112432269A (en) * | 2020-11-27 | 2021-03-02 | 上海碳索能源服务股份有限公司 | Method and system for optimizing set value of pressure difference of refrigerating water pump of refrigerating room |
| CN112665121A (en) * | 2020-12-10 | 2021-04-16 | 珠海格力电器股份有限公司 | Control method and device for air conditioner chilled water pump, controller and air conditioning system |
| CN112963887A (en) * | 2021-03-25 | 2021-06-15 | 中冶西北工程技术有限公司 | Single-tank heat storage heating equipment and heat output adjusting method |
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| CN112432269A (en) * | 2020-11-27 | 2021-03-02 | 上海碳索能源服务股份有限公司 | Method and system for optimizing set value of pressure difference of refrigerating water pump of refrigerating room |
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