CN111947256A - Air conditioner water system flow measurement system and method and air conditioner water system - Google Patents
Air conditioner water system flow measurement system and method and air conditioner water system Download PDFInfo
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- 238000004378 air conditioning Methods 0.000 claims abstract description 45
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0003—Exclusively-fluid 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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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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
- F24F11/85—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
- F24F11/88—Electrical aspects, e.g. circuits
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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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- 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
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Abstract
The invention belongs to the technical field of monitoring of a central air-conditioning water system, and particularly provides an air-conditioning water system flow measurement system and method and an air-conditioning water system. And respectively acquiring the total flow, the total water supply temperature, the total return water temperature and the temperature of each return water branch pipe of the water supply main pipe, and calculating according to the space-time water regulation system flow and the energy conservation equation set to obtain the flow of the water supply branch pipe set corresponding to the return water branch pipe set. According to the scheme, flow sensors are not additionally arranged at the water distributor and the water collector, water flow of each branch can be obtained, the running condition of the air-conditioning water system is monitored, and quantitative reference is provided for hydraulic balance of the air-conditioning water system. The water-saving device has the advantages of simple structure, low manufacturing cost and convenience in implementation, can be used in air-conditioning water systems of implemented projects, and has the advantages of safety and economy. The method is popularized, referred and applied in the cold water machine room project of the station.
Description
Technical Field
The invention belongs to the technical field of monitoring of a central air-conditioning water system, and particularly relates to an air-conditioning water system flow measuring system and method and an air-conditioning water system.
Background
Central air conditioning systems have been widely used in large public buildings to provide a comfortable indoor hot and humid environment, and have occupied an important place in people's daily lives. Hydraulic imbalance is a common problem in the operation process of an air-conditioning water system, and the hydraulic imbalance of the air-conditioning water system not only can affect the operation effect of the air-conditioning system and further affect the indoor environment, but also can cause the phenomenon of energy waste. Therefore, the flow balance of the air-conditioning water system is very important.
Hydraulic imbalance of an air-conditioning water system can be divided into static and dynamic working conditions. The static hydraulic imbalance refers to the condition that under the condition of restriction of various factors such as system design, engineering construction and engineering materials, the resistance value of the air conditioning system pipeline is different from the value specified in the system design. The dynamic hydraulic imbalance is the phenomenon that the flow of each user in an air-conditioning water system is affected by other users when the valve is adjusted, and the actual flow does not accord with the designed flow. Both static and dynamic hydraulic imbalances ultimately result in system end flows that are inconsistent with the design flows. In engineering practice, generally, only a system main pipe is provided with a flow sensor to monitor the total flow of the system, and flow sensors are not arranged at all branches connected with a water distributing and collecting device of an air conditioning system and an air conditioner, so that the flow of all branches of a water system cannot be obtained in time, and the unbalanced flow state of the system cannot be sensed.
Disclosure of Invention
The invention aims to solve the problem that the flow of each branch of a water system cannot be acquired in time in the prior art, and the flow imbalance state of the system cannot be sensed.
Therefore, the invention provides an air conditioner water system flow measurement system, which comprises a flowmeter group, a temperature sensor group and a data acquisition and calculation module;
the flow meter group is used for acquiring the total flow M of the water supply main pipe in real time;
the temperature sensor group is used for acquiring the total water supply temperature T of the water supply main pipe at the jth moment in real time0jAnd total return water temperature TT of return water main pipej；
The temperature sensor group is used for acquiring the temperature of each backwater branch pipe in the backwater branch pipe group corresponding to the water supply branch pipe group in real time;
the data acquisition and calculation module is used for obtaining each water supply according to the following energy balance equationFlow rate M of branch pipei：
Wherein, Ti，jThe water return temperature of the ith water return branch pipe at the jth moment is shown, and n is a natural number greater than 1.
Preferably, the flowmeter is a portable ultrasonic flowmeter, the temperature sensor is a patch type temperature sensor, the portable ultrasonic flowmeter is arranged on the water supply main pipe, and the patch type temperature sensor is attached to the pipe wall of the return water branch pipe.
Preferably, the water supply branch pipe set comprises a plurality of water supply branch pipes separated from the water supply main pipe, the water return branch pipe set comprises a plurality of water return branch pipes, and each water return branch pipe corresponds to each water supply branch pipe one to one.
Preferably, the water supply branch pipe group comprises a first water supply branch pipe, a second water supply branch pipe, a third water supply branch pipe and a fourth water supply branch pipe;
the water return branch pipe group comprises a first water return branch pipe, a second water return branch pipe, a third water return branch pipe and a fourth water return branch pipe which are respectively in one-to-one correspondence with the first water supply branch pipe, the second water supply branch pipe, the third water supply branch pipe and the fourth water supply branch pipe;
the energy balance equation is converted into measurement formula (1):
M(T5-T0)＝M1(T1-T0)+M2(T2-T0)+M3(T3-T0)+M4(T4-T0) (1)
wherein, M1, M2, M3 and M4 are respectively the flow rates of the first water supply branch pipe, the second water supply branch pipe, the third water supply branch pipe and the fourth water supply branch pipe, and T1, T2, T3 and T4 are respectively the temperatures of the first water return branch pipe, the second water return branch pipe, the third water return branch pipe and the fourth water return branch pipe.
Preferably, the total flow rate M is an average value of flow rates at respective times.
Preferably, a water separator is arranged at the tail end of the water supply main pipe, an outlet of the water separator is connected with a water supply branch pipe group, and a water collector is arranged at the tail end of the water return branch pipe group.
Preferably, the data acquisition and calculation module is a single chip microcomputer.
Preferably, the backwater branch pipe group is a metal pipe, and the patch type temperature sensor is attached to the outer wall of the metal pipe.
The invention also provides a method for measuring the flow of the air-conditioning water system, which comprises the following steps:
respectively collecting total flow M of the water supply main pipe and total water supply temperature T of the water supply main pipe at the jth moment0jAnd total return water temperature TT of return water main pipejAnd the temperature of each return branch pipe;
the flow M of the water supply branch pipe group is obtained according to the following energy balance equation:
wherein, Ti，jThe water return temperature of the ith water return branch pipe at the jth moment is shown, and n is a natural number greater than 1.
The invention also provides an air-conditioning water system which comprises a refrigerating unit, a water pump and the air-conditioning water system flow measuring system, wherein the refrigerating unit, the water pump, the water supply main pipe, the water supply branch pipe group and the water return branch pipe group are sequentially connected end to end.
The invention has the beneficial effects that: the invention provides a flow measurement system and a flow measurement method for an air-conditioning water system and the air-conditioning water system. Respectively collecting total flow M of the water supply main pipe and total water supply temperature T of the water supply main pipe at the jth moment0jAnd total return water temperature TT of return water main pipejAnd the temperature of each return branch pipe. And calculating to obtain the flow of the water supply branch pipe group corresponding to the return water branch pipe group according to the space-time water transfer system flow and the energy conservation equation, namely calculating to obtain the flow M of the water supply branch pipe group corresponding to the return water branch pipe group according to the following formula.
The proposal does not need to be arranged at the water separator and the water collectorThe flow sensor is additionally arranged, and the water flow of each branch can be obtained by only measuring the flow and the temperature of the water supply main pipe and the temperature of each return branch pipe, so that the running condition of the air-conditioning water system is monitored, and quantitative reference is provided for the hydraulic balance of the air-conditioning water system. The water-saving device has the advantages of simple structure, low manufacturing cost and convenience in implementation, can be used in air-conditioning water systems of implemented projects, and has the advantages of safety and economy. The method is popularized, referred and applied in the cold water machine room project of the station.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a flow measurement system and method for an air conditioning water system and a structure of the air conditioning water system according to the present invention.
Description of reference numerals: the device comprises a refrigerating unit 1, a water pump 2, a water supply header pipe 3, a portable ultrasonic flowmeter 4, a water distributor 5, a first water supply branch pipe 6(1), a second water supply branch pipe 6(2), a third water supply branch pipe 6(3), a fourth water supply branch pipe 6(4), a water collector 7, a first water return branch pipe 8(1), a second water return branch pipe 8(2), a third water return branch pipe 8(3), a fourth water return branch pipe 8(4), a patch type temperature sensor 9, a water return header pipe 10 and a data acquisition and calculation module 11.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The embodiment of the invention provides a flow measurement system of an air-conditioning water system, which comprises a flowmeter group, a temperature sensor group and a data acquisition and calculation module, wherein the flowmeter group is connected with the temperature sensor group;
the flow meter group is used for acquiring the total flow M of the water supply main pipe in real time;
the temperature sensor group is used for acquiring the total water supply temperature T of the water supply main pipe at the jth moment in real time0jAnd total return water temperature TT of return water main pipej；
The temperature sensor group is used for acquiring the temperature of each backwater branch pipe in the backwater branch pipe group corresponding to the water supply branch pipe group in real time;
the data acquisition and calculation module is used for obtaining the flow M of each water supply branch pipe according to the following energy balance equationi：
Wherein, Ti，jThe water return temperature of the ith water return branch pipe at the jth moment is shown, and n is a natural number greater than 1. Therefore, if n water supply branch pipes and n water return branch pipes exist, the water temperature needs to be measured for n times to obtain n equations, and then the water supply flow of each water supply branch pipe can be obtained through simultaneous solving.
In a specific implementation scenario, the water supply branch pipe group comprises a first water supply branch pipe 6(1), a second water supply branch pipe 6(2), a third water supply branch pipe 6(3) and a fourth water supply branch pipe 6 (4);
the water return branch pipe set comprises a first water return branch pipe 8(1), a second water return branch pipe 8(2), a third water return branch pipe 8(3) and a fourth water return branch pipe 8(4) which are respectively in one-to-one correspondence with the first water supply branch pipe 6(1), the second water supply branch pipe 6(2), the third water supply branch pipe 6(3) and the fourth water supply branch pipe 6 (4);
the energy balance equation is converted into measurement formula (1):
M(T5-T0)＝M1(T1-T0)+M2(T2-T0)+M3(T3-T0)+M4(T4-T0) (1)
wherein, M1, M2, M3 and M4 are the flow rates of the first water supply branch pipe 6(1), the second water supply branch pipe 6(2), the third water supply branch pipe 6(3) and the fourth water supply branch pipe 6(4), respectively, and T1, T2, T3 and T4 are the temperatures of the first water return branch pipe 8(1), the second water return branch pipe 8(2), the third water return branch pipe 8(3) and the fourth water return branch pipe 8(4), respectively.
The measurement principle is specifically as follows:
a surface-mounted temperature sensor 9 is arranged on a water supply and return header pipe and each water return branch pipe of the air-conditioning water system to measure the wall surface temperature and transmit the wall surface temperature to a collecting and calculating device. A portable ultrasonic flowmeter 4 is arranged on a water supply main pipe of the air-conditioning water system to measure the total water flow of the system. The measuring device is adopted to automatically record the measured value of the system, namely the total water flow of the system, the wall temperature of the water supply and return header pipe and the wall temperature of each water return branch pipe. The method for calculating the water flow of each water supply branch of the air-conditioning water system is provided, namely the water flow of each branch can be calculated by utilizing the measured wall surface temperature of a water supply and return header pipe, the wall surface temperature of each branch water return pipe and the total water flow of the system. The measurement and calculation method is based on the energy balance of a closed water system. The energy balance equation is shown in equation (1):
M(T5-T0)＝M1(T1-T0)+M2(T2-T0)+M3(T3-T0)+M4(T4-T0) (1)
the measurement at the nth time is expressed by equation (2). When the flow of the fixed-flow air-conditioning water system or the tail end is not regulated, the resistance characteristic of the pipe network is unchanged, and the total flow and the flow of the large branch are also unchanged. Although the measurement has certain fluctuation and error, the total flow of the system can be taken as the average value of the flow at each moment.
M(T5(n)-T0(n))＝M1(T1(n)-T0(n))+M2(T2(n)-T0(n))+M3(T3(n)-T0(n))+M4(T4(n)-T0(n)) (2)
If there are n time measurements, equation (2) can be written as matrix form (3), and the flow calculation for each branch is as equation (4).
Order to
Then there is
The invention can obtain the water flow of each branch of the air-conditioning water system on the basis of no need of additionally arranging a flow sensor, can effectively monitor the water flow of each branch in real time, and provides quantitative reference for the hydraulic balance of the air-conditioning water system.
The scheme has the characteristics of low manufacturing cost, simple structure and convenient implementation. The wall temperature of a water supply and return header pipe and the wall temperature of each branch water return pipe are measured by adopting a surface-mounted temperature sensor, the total water flow of the system is measured by adopting a portable ultrasonic flowmeter, and the measured value of the system is recorded in real time. When the water system does not adjust the flow, the resistance characteristic is not changed, and the flow of each branch can be obtained through a mathematical method according to the principle of flow and energy balance. According to the measured branch flow of the air conditioning water system, the hydraulic imbalance degree of the system can be found in time and corresponding measures are adopted to improve the hydraulic characteristic.
The invention also provides a method for measuring the flow of the air-conditioning water system, which comprises the following steps:
respectively collecting total flow M of the water supply main pipe and total water supply temperature T of the water supply main pipe at the jth moment0jAnd total return water temperature TT of return water main pipejAnd the temperature of each return branch pipe;
the flow M of the water supply branch pipe group is obtained according to the following energy balance equation:
wherein, Ti，jThe water return temperature of the ith water return branch pipe at the jth moment is shown, and n is a natural number greater than 1.
The invention also provides an air-conditioning water system which comprises a refrigerating unit 1, a water pump 2, a water supply main pipe 3 and a water separator 5, wherein the water supply branch pipe group comprises a first water supply branch pipe 6(1) with the corresponding flow rate of M1; the second water supply branch pipe 6(2) has a corresponding flow rate of M2; the third water supply branch pipe 6(3) has a corresponding flow rate of M3; a fourth water supply branch pipe 6(4) with a corresponding flow rate of M4, a water collector 7, a return water branch pipe group which comprises a first return water branch pipe 8(1), a second return water branch pipe 8(2), a third return water branch pipe 8(3), a fourth return water branch pipe 8(4) and a return water main pipe 10. The measuring system mainly comprises a portable ultrasonic flowmeter 4 (corresponding to a flow rate M), a patch type temperature sensor 9 (measuring points are respectively a water supply temperature T0, a temperature T1 of a first water return branch pipe 8(1), a temperature T2 of a second water return branch pipe 8(2), a temperature T3 of a third water return branch pipe 8(3), a temperature T4 of a fourth water return branch pipe 8(4), a total water return temperature T5) and a data acquisition and calculation module 11. Compared with the traditional air-conditioning water system, only a plurality of groups of patch type temperature sensors, portable ultrasonic flow meters and data acquisition and calculation modules 11 are added.
The method and the device for measuring the flow of each branch of the water collector of the air-conditioning water system are provided when the flow of the constant-flow air-conditioning water system or the tail end is not regulated. The method adopts a surface mount type temperature sensor to measure the wall surface temperature of a water supply and return main pipe and each branch water return pipe, adopts a portable ultrasonic flowmeter to measure the total water flow of the system, and utilizes a measuring device to record the measured value of the system in real time. For a constant-flow air-conditioning water system or a tail end, when the flow is not regulated, the resistance characteristic of the air-conditioning water system is not changed, and the flow of each branch can be obtained through a mathematical method according to the principles of flow balance and energy balance. According to the result, the invention can find the hydraulic disorder degree of the air-conditioning water system in time and adopt corresponding measures to improve the hydraulic characteristic.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (10)
1. The utility model provides an air conditioner water system flow measurement system which characterized in that: the system comprises a flowmeter group, a temperature sensor group and a data acquisition and calculation module;
the flow meter group is used for acquiring the total flow M of the water supply main pipe in real time;
the temperature sensor group is used for acquiring the total water supply temperature T of the water supply main pipe at the jth moment in real time0jAnd total return water temperature TT of return water main pipej；
The temperature sensor group is used for acquiring the temperature of each backwater branch pipe in the backwater branch pipe group corresponding to the water supply branch pipe group in real time;
the data acquisition and calculation module is used for obtaining the flow M of each water supply branch pipe according to the following energy balance equationi：
Wherein, Ti，jThe water return temperature of the ith water return branch pipe at the jth moment is shown, and n is a natural number greater than 1.
2. An air conditioner water system flow measurement system according to claim 1, wherein: the flowmeter is a portable ultrasonic flowmeter, the temperature sensor is a patch type temperature sensor, the portable ultrasonic flowmeter is arranged on the water supply main pipe, and the patch type temperature sensor is attached to the pipe wall of the return water branch pipe.
3. An air conditioner water system flow measurement system according to claim 1, wherein: the water supply branch pipe set comprises a plurality of water supply branch pipes separated from a water supply main pipe, the water return branch pipe set comprises a plurality of water return branch pipes, and each water return branch pipe corresponds to each water supply branch pipe one to one.
4. An air conditioner water system flow measurement system according to claim 3, wherein: the water supply branch pipe group comprises a first water supply branch pipe, a second water supply branch pipe, a third water supply branch pipe and a fourth water supply branch pipe;
the water return branch pipe group comprises a first water return branch pipe, a second water return branch pipe, a third water return branch pipe and a fourth water return branch pipe which are respectively in one-to-one correspondence with the first water supply branch pipe, the second water supply branch pipe, the third water supply branch pipe and the fourth water supply branch pipe;
the energy balance equation is converted into measurement formula (1):
M(T5-T0)＝M1(T1-T0)+M2(T2-T0)+M3(T3-T0)+M4(T4-T0) (1)
wherein, M1, M2, M3 and M4 are respectively the flow rates of the first water supply branch pipe, the second water supply branch pipe, the third water supply branch pipe and the fourth water supply branch pipe, and T1, T2, T3 and T4 are respectively the temperatures of the first water return branch pipe, the second water return branch pipe, the third water return branch pipe and the fourth water return branch pipe.
5. An air conditioner water system flow measurement system according to claim 1, wherein: the total flow rate M is an average value of flow rates at various times.
6. An air conditioner water system flow measurement system according to claim 1, wherein: the tail end of the water supply main pipe is provided with a water separator, an outlet of the water separator is connected with a water supply branch pipe group, and the tail end of the water return branch pipe group is provided with a water collector.
7. An air conditioner water system flow measurement system according to claim 1, wherein: the data acquisition and calculation module is a single chip microcomputer.
8. An air conditioner water system flow measurement system according to claim 2, wherein: the backwater branch pipe group is a metal pipe, and the patch type temperature sensor is attached to the outer wall of the metal pipe.
9. A method for measuring the flow of an air conditioner water system is characterized by comprising the following steps:
respectively collecting total flow M of the water supply main pipe and total water supply temperature T of the water supply main pipe at the jth moment0jAnd total return water temperature TT of return water main pipejAnd the temperature of each return branch pipe;
the flow M of the water supply branch pipe group is obtained according to the following energy balance equation:
wherein, Ti，jThe water return temperature of the ith water return branch pipe at the jth moment is shown, and n is a natural number greater than 1.
10. The utility model provides an air conditioner water system, includes refrigerating unit and water pump, its characterized in that: the air-conditioning water system flow measuring system of any one of claims 1 to 8, wherein the refrigerating unit, the water pump, the water supply main pipe, the water supply branch pipe group and the water return branch pipe group are sequentially connected end to end.
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