CN102353403A - Methods for measuring chilled water flow and cooling medium flow of central air-conditioning host machine - Google Patents

Methods for measuring chilled water flow and cooling medium flow of central air-conditioning host machine Download PDF

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CN102353403A
CN102353403A CN 201110251011 CN201110251011A CN102353403A CN 102353403 A CN102353403 A CN 102353403A CN 201110251011 CN201110251011 CN 201110251011 CN 201110251011 A CN201110251011 A CN 201110251011A CN 102353403 A CN102353403 A CN 102353403A
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central air
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air conditioner
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CN102353403B (en
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赵歆治
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China New Energy Technology Development Co. Ltd. (Tianjin)
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赵歆治
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Abstract

The invention belongs to the field of heating, ventilating and air-conditioning engineering and relates to a method for measuring chilled water flow of a central air-conditioning host machine. In the method, a linear relation between compressor actual input power and compressor theoretical input power is firstly established by utilizing factory test data or field measuring test data of the central air-conditioning host machine, and an adopted calculation method comprises the following steps of: (1) calculating the current flow of a refrigerant flow inside a refrigerating system of the central air-conditioning host machine; and (2) acquiring the flow of the chilled water of the central air-conditioning host machine according to a formula in the specification, wherein h11 represents an enthalpy value of the refrigerant at a condenser outlet, Cp represents the specific heat of the chilled water, T(evap,1) represents the temperature of a chilled water outlet of an evaporator of the central air-conditioning host machine, and T(evap,o) represents the temperature of a chilled water outlet of the evaporator of the central air-conditioning host machine. The invention simultaneously provides a method for measuring cooling medium flow of the central air-conditioning host machine. The methods disclosed by the invention are accurate and stable and has the advantage of greatly saving a large amount of instrument calibration and maintenance expenses compared with the traditional flowmeter.

Description

Central air conditioner main machine chilled-water flow and cooling medium consumption measuring method
Technical field
The invention belongs to Heating,Ventilating and Air Conditioning (HVAC) engineering field, be specifically related to a kind of measuring method that is used to monitor central air conditioner main machine chilled-water flow and cooling medium consumption.
Background technology
The chilled-water flow of central air conditioner main machine and cooling medium consumption monitored have great importance.The refrigeration system of central air conditioner main machine is generally carried out heat exchange with water or air as medium and cold-producing medium; Suitable chilled-water flow and cooling medium consumption can guarantee that the refrigeration system of central air conditioner main machine is operated in state preferably, guarantee the work efficiency of unit.Unsuitable chilled-water flow and cooling medium consumption possibly cause the evaporator of air-conditioner host to freeze, condensing pressure raises, system's refrigerating efficiency descends.
Adopt flow instruments such as vortex shedding flow meter, ultrasonic flow meter, electromagnetic flowmeter for the water/air mass flow monitoring of central air conditioner main machine at present more.The price and the maintenance cost of above-mentioned flow instrument are high, and have certain requirement for mounting condition, and the distance that need satisfy upstream and downstream like the installation site of instrument is greater than the pipe diameter of several times.Expensive instrument price, maintenance cost and system's installation requirement have greatly limited flowmeter in actual application in engineering.
Summary of the invention
Fundamental purpose of the present invention is the deficiency that overcomes existing flow monitoring method, develops a kind of virtual flowmeter the chilled-water flow and the cooling medium consumption of central air conditioner main machine are monitored.The present invention is based on the measured value of existing central air conditioner main machine sensor; Utilize the method for modeling that the chilled-water flow and the cooling medium consumption of central air conditioner main machine are predicted; Thereby realize the flow of main frame refrigeration system is monitored; Application is the hollow air-conditioner host, and its system should comprise evaporator, compressor, condenser and restriction device.Technical scheme of the present invention is following:
A kind of chilled water flow measuring method of central air conditioner main machine, this method at first utilize the delivery test data of central air conditioner main machine or in-site measurement experimental data to set up the actual power input (W of compressor Ac) and the theoretical power input (W of compressor Th) linear relationship, in actual measurement, adopt following computing method:
(1) according to the actual power input (W of the current compressor that records Ac), calculate the theoretical power input (W of compressor Th), according to formula Obtain the refrigerant flow in the current central air conditioner main machine refrigeration system
Figure BDA0000087123460000012
In the formula, the cold-producing medium enthalpy h of the compressor outlet of central air conditioner main machine DisAccording to the refrigerant temperature T of cold-producing medium character by compressor outlet Dis, and condensing pressure P CondConfirm; The cold-producing medium enthalpy h of the compressor inlet of central air conditioner main machine SucAccording to the refrigerant temperature T of cold-producing medium character by compressor inlet Suc, and condensing pressure P EvapConfirm;
(2) chilled-water flow of central air conditioner main machine
Figure BDA0000087123460000021
According to formula
Figure BDA0000087123460000022
Obtain, wherein, the cold-producing medium enthalpy h of condensator outlet LlAccording to the refrigerant temperature T of cold-producing medium character by condensator outlet LlWith condensing pressure P CondConfirm; C p: freezing specific heat of water; T Evap, i: the chilled water inlet temperature of central air conditioner main machine evaporator; T Evap, o: the chilled water outlet temperature of central air conditioner main machine evaporator.
As preferred implementation, a kind of chilled water flow measuring method of central air conditioner main machine is characterized in that, is setting up the actual power input (W of compressor Ac) and the theoretical power input (W of compressor Th) linear relationship the time, can confirm the theoretical power input of compressor according to formula: Also can confirm the theoretical power input of compressor by formula:
Figure BDA0000087123460000024
The present invention provides a kind of cooling medium consumption measuring method of central air conditioner main machine simultaneously, and this method at first utilizes the delivery test data of central air conditioner main machine or in-site measurement experimental data to set up the actual power input (W of compressor Ac) and the theoretical power input (W of compressor Th) linear relationship, in actual measurement, adopt following computing method:
(1) according to the actual power input (W of the current compressor that records Ac), calculate the theoretical power input (W of compressor Th), according to formula Obtain the refrigerant flow in the current central air conditioner main machine refrigeration system
Figure BDA0000087123460000026
In the formula, the cold-producing medium enthalpy h of the compressor outlet of central air conditioner main machine DisAccording to the refrigerant temperature T of cold-producing medium character by compressor outlet Dis, and condensing pressure P CondConfirm; The cold-producing medium enthalpy h of the compressor inlet of central air conditioner main machine SucAccording to the refrigerant temperature T of cold-producing medium character by compressor inlet Suc, and condensing pressure P EvapConfirm;
(2) cooling medium consumption of central air conditioner main machine
Figure BDA0000087123460000027
According to
Figure BDA0000087123460000028
With
Figure BDA0000087123460000029
Obtain, wherein, the cold-producing medium enthalpy h of condensator outlet LlRefrigerant temperature T through condensator outlet LlWith condensing pressure P CondCalculate and obtain; C p: the specific heat of heat eliminating medium; T Cond, o: the heat eliminating medium outlet temperature of central air conditioner main machine condenser; T Cond, i: the cooling medium inlet temperature of central air conditioner main machine condenser; T Evap, i: the chilled water inlet temperature of central air conditioner main machine evaporator; T Evap, o: the chilled water outlet temperature of central air conditioner main machine evaporator.
, cooling medium consumption sets up the actual power input (W of compressor before measuring Ac) and the theoretical power input (W of compressor Th) linear relationship equally also can adopt two kinds of above-mentioned methods to confirm the theoretical power input of compressor.
The present invention can be used for the chilled-water flow of central air conditioner main machine and cooling medium consumption are monitored; Measured value based on existing central air conditioner main machine sensor; Utilize the method for modeling that the chilled-water flow and the cooling medium consumption of central air conditioner main machine are predicted, thereby realize the chilled-water flow and the cooling medium consumption of main frame refrigeration system are monitored.Virtual stream measuring method of the present invention has following outstanding feature:
(1) experiment shows that this method measurement is accurate, stable;
(2) this method adopts the mode of virtual flow measurement, with traditional flowmeter savings in comparison a large amount of instrument calibration and maintenance costs;
(3) this method adopts the mode of virtual flow measurement, does not have the restriction of installation requirement with traditional flowmeter system of comparing;
(4) this method cost performance is high, can monitor the flow of main frame vaporizer side and condenser side simultaneously, compares with traditional flowmeter and can save a large amount of initial costs.
Description of drawings
Fig. 1 is used for confirming the central air conditioner main machine cooling cycle system figure of flow.
Embodiment
Fig. 1 is a typical central air-conditioner host Vapor Compression Refrigeration Cycle system 10.System 10 comprises the cooling medium circulation system 20 and the chilled water circulation system 22.Refrigerant vapour during refrigeration system work in the compressor 12 suction evaporators 18 is compressed the back and gets into condenser 14.Cold-producing medium is cooled to liquid in equipressure under condensing pressure, and liberated heat is passed to heat eliminating medium if adopt water-cooling pattern during condensation of refrigerant, and heat eliminating medium is a water, if adopt cooling air mode, heat eliminating medium is an air.Condensed liquid gets into evaporator 18 through restriction device 16.Cold-producing medium seethes with excitement under evaporating pressure, carries out heat exchange with chilled water.
As shown in Figure 1, a typical central air conditioner main machine should comprise with lower sensor: the refrigerant temperature T of compressor inlet Suc, the refrigerant temperature T of compressor outlet Dis, condensator outlet refrigerant temperature T Ll, evaporating pressure P Evap, condensing pressure P Cond, cooling water inlet temperature T Cond, i, cooling water outlet temperature T Cond, o, chilled water inlet temperature T Evap, i, the chilled water outlet temperature T Evap, o, the actual power input W of compressor Ac
Central air conditioner cooling medium flow and chilled water flow
Figure BDA0000087123460000042
by equations (1a) and equation (1b) OK.
Figure BDA0000087123460000043
Figure BDA0000087123460000044
Used parameter interpretation is following in the equation:
Figure BDA0000087123460000045
central air conditioner cooling medium flow;
Figure BDA0000087123460000046
central air conditioner refrigeration refrigerant flow within the system;
h Dis: the cold-producing medium enthalpy h of the compressor outlet of central air conditioner main machine DisAccording to the refrigerant temperature T of cold-producing medium character by compressor outlet Dis, and condensing pressure P CondConfirm;
h Ll: the cold-producing medium enthalpy h of condensator outlet LlAccording to the refrigerant temperature T of cold-producing medium character by condensator outlet LlWith condensing pressure P CondConfirm;
C p: the specific heat of water or air;
T Cond, o: the heat eliminating medium outlet temperature of central air conditioner main machine condenser;
T Cond, i: the cooling medium inlet temperature of central air conditioner main machine condenser;
Figure BDA0000087123460000047
central air conditioner chilled water flow
h Suc: the cold-producing medium enthalpy h of the compressor inlet of central air conditioner main machine SucAccording to the refrigerant temperature T of cold-producing medium character by compressor inlet Suc, and condensing pressure P EvapConfirm;
T Evap, i: the chilled water inlet temperature of central air conditioner main machine evaporator;
T Evap, o: the chilled water inlet temperature of central air conditioner main machine evaporator.
In the equation (1a) and equation (1b), in addition to central air conditioner refrigerant in the system refrigerant flow
Figure BDA0000087123460000048
is an unknown quantity, the other parameters are known quantities, obtained directly by the sensor readings.
Central air conditioner refrigerant within the refrigeration system flow rate
Figure BDA0000087123460000049
by Equation (2) determined by:
Figure BDA00000871234600000410
Used parameter interpretation is following in the equation:
Figure BDA00000871234600000411
central air conditioner refrigeration refrigerant flow within the system;
W Th: the theoretical power input of compressor;
h Dis: the cold-producing medium enthalpy h of the compressor outlet of central air conditioner main machine DisAccording to the refrigerant temperature T of cold-producing medium character by compressor outlet Dis, and condensing pressure P CondConfirm;
h Suc: the cold-producing medium enthalpy h of the compressor inlet of central air conditioner main machine SucAccording to the refrigerant temperature T of cold-producing medium character by compressor inlet Suc, and condensing pressure P EvapConfirm;
In equation (2), remove the theoretical power input W of compressor ThBe unknown quantity, other parameter is known quantity.
The theoretical power input W of compressor ThCan confirm by equation (3):
W th=a×W ac+b (3)
Used parameter interpretation is following in the equation:
W Th: the theoretical power input of compressor;
W Ac: the actual power input of compressor;
A and b: the fit equation coefficient, this coefficient can be obtained by following two kinds of methods.
Method 1: the delivery test data based on central air conditioner main machine are confirmed coefficient a and b.
The theoretical power input of the compressor of (at least four load conditions) can be confirmed by equation (4) one by one under the different load operating condition of test condition
Figure BDA0000087123460000051
Used parameter interpretation is following in the equation:
W Th: the theoretical power input of compressor;
C p: the specific heat of water or air;
Figure BDA0000087123460000052
central air conditioner cooling medium flow;
T Cond, o: the heat eliminating medium outlet temperature of central air conditioner main machine condenser;
T Cond, i: the cooling medium inlet temperature of central air conditioner main machine condenser;
central air conditioner chilled water flow;
T Evap, i: the chilled water inlet temperature of central air conditioner main machine evaporator;
T Evap, o: the chilled water outlet temperature of central air conditioner main machine evaporator.
W Ac: the actual power input of compressor;
The actual input power measurement data W of compressor to (at least four load conditions) under the different load working condition AcAnd by the theoretical power input data W of the definite compressor of equation (4) ThCarry out match, then can confirm coefficient a and b in the equation (3).
In addition, if the test figure of producer comprises the refrigerant temperature T of different load working condition lower compression machine outlet DisRefrigerant temperature T with compressor inlet Suc(30), the theoretical power input data W of the compressor in the equation (4) ThAlso can obtain by equation (5):
Figure BDA0000087123460000054
Used parameter interpretation is following in the equation:
W Th: the theoretical power input of compressor;
h Dis: the cold-producing medium enthalpy h of the compressor outlet of central air conditioner main machine DisAccording to the refrigerant temperature T of cold-producing medium character by compressor outlet Dis, and condensing pressure P CondConfirm;
h Suc: the cold-producing medium enthalpy h of the compressor inlet of central air conditioner main machine SucAccording to the refrigerant temperature T of cold-producing medium character by compressor inlet SucAnd condensing pressure P (30), EvapConfirm;
Figure BDA0000087123460000061
Refrigerant flow in the central air conditioner main machine refrigeration system can utilize the cooling medium consumption of central air conditioner main machine
Figure BDA0000087123460000062
The heat eliminating medium outlet temperature T of central air conditioner main machine condenser Cond, oThe cooling medium inlet temperature T of central air conditioner main machine condenser Cond, i: the cold-producing medium enthalpy h of the compressor outlet of central air conditioner main machine DisThe cold-producing medium enthalpy h of condensator outlet LlCalculate definite etc. known parameters;
The actual input power measurement data W of compressor to (at least four load conditions) under the different load working condition AcAnd by the theoretical power input data W of the definite compressor of equation (5) ThCarry out match, then can confirm coefficient a and b in the equation (3).
Method 2: confirm coefficient a and b based on the in-site measurement experimental data.
For the unit of the delivery test data that central air conditioner main machine can't be provided, can confirm coefficient a and b through the mode of in-site measurement.The in-site measurement parameter that needs is following:
Figure BDA0000087123460000063
central air conditioner cooling medium flow;
Figure BDA0000087123460000064
central air conditioner chilled water flow;
T Cond, o: the heat eliminating medium outlet temperature of central air conditioner main machine condenser;
T Cond, i: the cooling medium inlet temperature of central air conditioner main machine condenser;
T Evap, i: the chilled water inlet temperature of central air conditioner main machine evaporator;
T Evap, o: the chilled water inlet temperature of central air conditioner main machine evaporator;
W Ac: the actual power input of compressor.
The actual input power measurement data W of compressor to (at least four load conditions) under the different load working condition AcAnd by the theoretical power input data W of the definite compressor of equation (4) ThCarry out match, then can confirm coefficient a and b in the equation (3).
Similar with method 1, the theoretical power input data W of the compressor in the equation (4) ThAlso can obtain by equation (5).The actual input power measurement data W of compressor to (at least four load conditions) under the different load working condition AcAnd by the theoretical power input data W of the definite compressor of equation (5) ThCarry out match, then can confirm coefficient a and b in the equation (3).

Claims (6)

1. the chilled water flow measuring method of a central air conditioner main machine, this method at first utilizes the delivery test data of central air conditioner main machine or in-site measurement experimental data to set up the actual power input (W of compressor Ac) and the theoretical power input (W of compressor Th) linear relationship, in actual measurement, adopt following computing method:
(1) according to the actual power input (W of the current compressor that records Ac), calculate the theoretical power input (W of compressor Th), according to formula
Figure FDA0000087123450000011
Obtain the refrigerant flow in the current central air conditioner main machine refrigeration system
Figure FDA0000087123450000012
In the formula, the cold-producing medium enthalpy h of the compressor outlet of central air conditioner main machine DisAccording to the refrigerant temperature T of cold-producing medium character by compressor outlet Dis, and condensing pressure P CondConfirm; The cold-producing medium enthalpy h of the compressor inlet of central air conditioner main machine SucAccording to the refrigerant temperature T of cold-producing medium character by compressor inlet Suc, and condensing pressure P EvapConfirm;
(2) chilled-water flow of central air conditioner main machine
Figure FDA0000087123450000013
According to formula
Figure FDA0000087123450000014
Obtain, wherein, the cold-producing medium enthalpy h of condensator outlet LlAccording to the refrigerant temperature T of cold-producing medium character by condensator outlet LlWith condensing pressure P CondConfirm; C p: freezing specific heat of water; T Evap, i: the chilled water inlet temperature of central air conditioner main machine evaporator; T Evap, o: the chilled water outlet temperature of central air conditioner main machine evaporator.
2. the chilled water flow measuring method of a central air conditioner main machine is characterized in that, is setting up the actual power input (W of compressor Ac) and the theoretical power input (W of compressor Th) linear relationship the time, confirm the theoretical power input of compressor according to formula:
Figure FDA0000087123450000015
3. the chilled water flow measuring method of central air conditioner main machine according to claim 1 is characterized in that, is setting up the actual power input (W of compressor Ac) and the theoretical power input (W of compressor Th) linear relationship the time, confirm the theoretical power input of compressor according to formula:
Figure FDA0000087123450000016
4. the cooling medium consumption measuring method of a central air conditioner main machine, this method at first utilizes the delivery test data of central air conditioner main machine or in-site measurement experimental data to set up the actual power input (W of compressor Ac) and the theoretical power input (W of compressor Th) linear relationship, in actual measurement, adopt following computing method:
(1) according to the actual power input (W of the current compressor that records Ac), calculate the theoretical power input (W of compressor Th), according to formula
Figure FDA0000087123450000017
Obtain the refrigerant flow in the current central air conditioner main machine refrigeration system
Figure FDA0000087123450000018
In the formula, the cold-producing medium enthalpy h of the compressor outlet of central air conditioner main machine DisAccording to the refrigerant temperature T of cold-producing medium character by compressor outlet Dis, and condensing pressure P CondConfirm; The cold-producing medium enthalpy h of the compressor inlet of central air conditioner main machine SucAccording to the refrigerant temperature T of cold-producing medium character by compressor inlet Suc, and condensing pressure P EvapConfirm;
(2) cooling medium consumption of central air conditioner main machine
Figure FDA0000087123450000021
According to
Figure FDA0000087123450000022
With Obtain, wherein, the cold-producing medium enthalpy h of condensator outlet LlRefrigerant temperature T through condensator outlet LlWith condensing pressure P CondCalculate and obtain; C p: the specific heat of heat eliminating medium; T Cond, o: the heat eliminating medium outlet temperature of central air conditioner main machine condenser; T Cond, i: the cooling medium inlet temperature of central air conditioner main machine condenser; T Evap, i: the chilled water inlet temperature of central air conditioner main machine evaporator; T Evap, o: the chilled water outlet temperature of central air conditioner main machine evaporator.
5. the cooling medium consumption measuring method of central air conditioner main machine according to claim 4 is characterized in that, is setting up the actual power input (W of compressor Ac) and the theoretical power input (W of compressor Th) linear relationship the time, confirm the theoretical power input of compressor according to formula:
Figure FDA0000087123450000024
6. the cooling medium consumption measuring method of central air conditioner main machine according to claim 4 is characterized in that, is setting up the actual power input (W of compressor Ac) and the theoretical power input (W of compressor Th) linear relationship the time, confirm the theoretical power input of compressor according to formula:
Figure FDA0000087123450000025
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CN111133281A (en) * 2017-09-20 2020-05-08 罗伯特·博世有限公司 Method and device for controlling a heating element for heating a sensor element of an air quality sensor of a vehicle, and air quality sensor system for a vehicle
CN111133281B (en) * 2017-09-20 2022-07-22 罗伯特·博世有限公司 Method and device for controlling a heating element for heating a sensor element of an air quality sensor of a vehicle, and air quality sensor system for a vehicle
CN110274627A (en) * 2019-06-25 2019-09-24 西安交通大学 The measurement method of interior high temperature and pressure working medium flow distribution is restrained in parallel connection
CN110274627B (en) * 2019-06-25 2020-06-19 西安交通大学 Measuring method for high-temperature and high-pressure working medium flow distribution in parallel tube bundle
EP4151929A3 (en) * 2021-08-31 2023-06-21 Schneider Electric Usa, Inc. Continuous learning compressor input power predictor
US11808468B2 (en) 2021-08-31 2023-11-07 Schneider Electric USA, Inc. Continuous learning compressor input power predictor

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