CN105571844A - Method for measuring heating ventilation air conditioning system water pump or valve flow - Google Patents
Method for measuring heating ventilation air conditioning system water pump or valve flow Download PDFInfo
- Publication number
- CN105571844A CN105571844A CN201510934868.3A CN201510934868A CN105571844A CN 105571844 A CN105571844 A CN 105571844A CN 201510934868 A CN201510934868 A CN 201510934868A CN 105571844 A CN105571844 A CN 105571844A
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- Prior art keywords
- valve
- water pump
- pump
- flow
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
Abstract
The invention discloses a method for measuring heating ventilation air conditioning system water pump or valve flow, and belongs to the technical field of heating ventilation air conditioning. According to the method, real-time water flow of a water pump or a valve is obtained through back calculation of pressure difference of the two ends of the water pump and operation frequency of the water pump or pressure difference of the two ends of the valve and valve opening obtained through onsite monitoring according to a characteristic curve equation of the water pump or the valve provided by manufacturers or the characteristic curve equation of the water pump or the valve obtained through actual onsite measurement and fitting. The characteristic curve equation of the water pump or the valve is fully utilized, real-time flow of the water pump or the vale can be economically and conveniently solved by monitoring easily measured pressure difference of the two ends of the water pump and operation frequency of the water pump or pressure difference of the two ends of the valve and valve opening, and accuracy is relatively high.
Description
Technical field
The invention belongs to Heating,Ventilating and Air Conditioning (HVAC) technical field, particularly a kind of method measuring heating ventilation air-conditioning system water pump or valve flow.
Background technology
The air-treatment scheme of heating ventilation air-conditioning system and the capacity for the treatment of facility are determined when to be in winter, summer design parameter and indoor load be least favorable to outdoor air.But in the most area of China, outdoor air parameter is often between winter, summer design parameter, and indoor load is also constantly change, and therefore heating ventilation air-conditioning system needs the change of load needed for end, makes corresponding runing adjustment.Water is as the main delivery of energy medium of heating ventilation air-conditioning system, and the runing adjustment of its flow parameter to heating ventilation air-conditioning system is most important.
In heating ventilation air-conditioning system, the method of existing measuring flow often adopts flowmeter, but the following problem of flowmeter ubiquity: separate unit is expensive, the flowmeter quantity of the runing adjustment needs of whole heating ventilation air-conditioning system is very large in addition, adds the installation cost of heating ventilation air-conditioning system; Installation requirement is higher, has delayed design and the construction speed of heating ventilation air-conditioning system; Flowmeter, as the additional friction element of water conveying system, can increase hydraulic cutting seam resistance undoubtedly, increases the operation power consumption of water pump; Easy damage, brings greatly inconvenience to the operation maintenance of heating ventilation air-conditioning system.
How economical convenient, do not measure the discharge of heating ventilation air-conditioning system water pump or valve with losing again degree of accuracy, be the problem that field of heating ventilation air conditioning is paid close attention to always.
Summary of the invention
The object of the invention is to propose a kind of method measuring heating ventilation air-conditioning system water pump or valve flow, the family curve equation of the water pump that the method provides according to producer or valve, or the water pump to obtain according to field measurement or valve characteristic curve equation, by the water pump two ends pressure reduction of field monitoring and water pump operation frequency or valve two ends pressure reduction and valve opening, inverse obtains the Real-time Water flow Q2 of water pump Real-time Water flow Q1 or valve, it is characterized in that, specifically comprise:
1) according to the water pump curve equation that producer provides: H=f (Q1, u),
In formula: H---pump head, unit is m
Q1---pump capacity, unit is m
3/ h
U---water pump operation frequency, unit is HZ
Then pressure differential deltap P=ρ gH=ρ gf (Q1, u) at water pump two ends
In formula: Δ P---water pump two ends pressure reduction, unit is Pa
The density of ρ---water, unit is kg/m
3
G---acceleration of gravity, 9.8m/s
2
The water pump curve equation H=f (Q1 that can provide according to producer thus, u), or according to the pump characteristic equation H=f (Q1 that field measurement matching obtains, u), by water pump two ends pressure differential deltap P and the water pump operation frequency u of field monitoring, inverse obtains the Real-time Water flow Q1 of water pump; Wherein, because different water pump curve equation is different, and family curve equation form is various, so cannot provide concrete equation, water pump curve equation H=f (Q1, u) that can only provide according to producer calculates;
2) according to valve characteristic curve equation Δ P=g (Q2, K)), direct-detection valve two ends pressure differential deltap P and valve opening K, by valve characteristic curve equation Δ P=g (Q2, K)) inverse goes out the Real-time Water flow Q2 of valve,
In formula: Δ P---valve two ends pressure reduction, unit is Pa
Q2---valve flow, unit is m
3/ h
K---valve opening, unit is %
Described system water pump used is constant speed pump, and now pump head H is the single-valued function H=f (Q1) of flow Q1, is namely the Q value that a H value can only be corresponding unique; Thus directly by field monitoring water pump two ends pressure differential deltap P, inverse obtains the Real-time Water flow Q1 of water pump.
Described system valve used is on-off valve, now valve two ends pressure differential deltap P is the single-valued function Δ P=g (Q2) of flow Q2, because the family curve equation of different valve is different, and family curve equation form is various, so concrete equation cannot be provided, according to the Q value that a Δ P value can only be corresponding unique; Then directly by field monitoring valve two ends pressure differential deltap P, inverse obtains the Real-time Water flow Q2 of valve.
Described step 1) in, as pump characteristic equation H=f (Q1, the u) that have producer comparatively accurately to provide, can direct-detection water pump two ends pressure differential deltap P and water pump operation frequency u, by equation Δ P=ρ gH=ρ gf (Q1, u), inverse goes out pump capacity Q1.
Described step 1) in, the pump characteristic equation provided when not having producer, or the pump characteristic error in equation that producer provides is larger, now need the running frequency u of the pump capacity Q1 of field measurement, water pump two ends pressure differential deltap P and water pump, wherein the measurement of pump capacity Q1 adopts ultrasonic flow meter, after measurement terminates, the lower ultrasonic flow meter of dismounting again, then according to pump capacity Q1, the water pump two ends pressure differential deltap P of field measurement and the running frequency u of water pump, Function Fitting water outlet pump curve equation Δ P=f (Q1, u).
Described step 2) in, the valve characteristic curve equation provided when not having producer, or the valve characteristic curve error in equation that producer provides is larger, now need the valve flow Q2 of field measurement, valve two ends pressure differential deltap P and valve opening K, wherein the measurement of valve flow can adopt ultrasonic flow meter, after measurement terminates, the more lower ultrasonic flow meter of dismounting.Then according to valve flow Q2, the water pump two ends pressure differential deltap P and valve opening K of field measurement, Function Fitting goes out family curve equation Δ P=g (Q2, K) of valve.
Beneficial effect of the present invention takes full advantage of the family curve equation of water pump or valve, the water pump two ends pressure reduction measured and water pump operation frequency or valve two ends pressure reduction and valve opening is easier to by monitoring rate, economy can obtain the real-time traffic of water pump or valve easily, and there is higher degree of accuracy.
Figure of description
Fig. 1 is the principle schematic measuring pump capacity.
Fig. 2 is the principle schematic measuring valve flow.
Embodiment
The present invention proposes a kind of method measuring heating ventilation air-conditioning system water pump or valve flow, the family curve equation of the water pump that the method provides according to producer or valve, or the water pump to obtain according to field measurement, matching or valve characteristic curve equation, by the water pump two ends pressure reduction of field monitoring and water pump operation frequency or valve two ends pressure reduction and valve opening, inverse obtains the Real-time Water flow of water pump or valve; Below in conjunction with specific embodiment, the specific embodiment of the present invention is described.
Embodiment 1:
The principle schematic of measurement pump capacity as shown in Figure 1.As the pump characteristic equation H=f (Q1 having producer comparatively accurately to provide, u) time, can direct-detection water pump two ends pressure differential deltap P and water pump operation frequency u, by equation Δ P=ρ gH=ρ gf (Q1, u), inverse goes out pump capacity Q1.If system water pump used is constant speed pump, now pump head H is the single-valued function H=f (Q1) of flow Q1, directly can pass through field monitoring water pump two ends pressure differential deltap P, be obtained the Real-time Water flow Q1 of water pump by equation Δ P=ρ gH=ρ gf (Q1, u) inverse.
The pump characteristic equation provided when not having producer, or the pump characteristic error in equation that producer provides is larger, now need the running frequency u of the pump capacity Q1 of field measurement, water pump two ends pressure differential deltap P and water pump, wherein the measurement of pump capacity Q1 can adopt ultrasonic flow meter, after measurement terminates, then disassemble ultrasonic flow meter.Then according to pump capacity Q1, the water pump two ends pressure differential deltap P of field measurement and the running frequency u of water pump, Function Fitting water outlet pump curve equation Δ P=f (Q1, u), thus can by detecting water pump two ends pressure differential deltap P and water pump operation frequency u, inverse goes out pump capacity Q1.If system water pump used is constant speed pump, now pump head H is the single-valued function H=f (Q1) of flow Q1, only need field measurement water pump two ends pressure differential deltap P and flow Q1, wherein the measurement of pump capacity Q1 can adopt ultrasonic flow meter, after measurement terminates, then disassemble ultrasonic flow meter.Then according to pump capacity Q1, the water pump two ends pressure differential deltap P of field measurement, Function Fitting water outlet pump curve equation Δ P=f (Q1), thus can by detecting water pump two ends pressure differential deltap P, and inverse goes out pump capacity Q1.
Embodiment 2:
The principle schematic of measurement valve flow as shown in Figure 2.Valve characteristic curve equation Δ P=g (Q2, K) when there being producer comparatively accurately to provide) time, can direct-detection valve two ends pressure differential deltap P and valve opening K, by valve characteristic curve equation, inverse goes out pump capacity Q2.If system valve used is on-off valve, now valve two ends pressure reduction is the single-valued function Δ P=g (Q2) of flow Q2, and directly can pass through field monitoring valve two ends pressure differential deltap P, inverse obtains the Real-time Water flow Q2 of valve.
The valve characteristic curve equation provided when not having producer, or the valve characteristic curve error in equation that producer provides is larger, now need the valve flow Q2 of field measurement, valve two ends pressure differential deltap P and valve opening K, wherein the measurement of valve flow can adopt ultrasonic flow meter, after measurement terminates, then disassemble ultrasonic flow meter.Then according to valve flow Q2, the water pump two ends pressure differential deltap P and valve opening K of field measurement, Function Fitting water outlet pump curve equation Δ P=g (Q2, K), thus can by detecting valve two ends pressure differential deltap P and valve opening K, inverse goes out valve flow Q2.If system valve used is on-off valve, now valve two ends pressure differential deltap P is the single-valued function Δ P=g (Q2) of flow Q2, only need field measurement valve two ends pressure differential deltap P and flow Q2, wherein the measurement of valve flow Q2 can adopt ultrasonic flow meter, after measurement terminates, then disassemble ultrasonic flow meter.Then according to valve flow Q2, the valve two ends pressure differential deltap P of field measurement, Function Fitting goes out family curve equation Δ P=g (Q2) of valve, thus can by detecting valve two ends pressure differential deltap P, and inverse goes out valve flow Q2.
Claims (6)
1. measure the method for heating ventilation air-conditioning system water pump or valve flow for one kind, it is characterized in that, the family curve equation of the water pump that the method provides according to producer or valve, or the water pump to obtain according to field measurement, matching or valve characteristic curve equation, the water pump two ends pressure reduction obtained by field monitoring and water pump operation frequency or valve two ends pressure reduction and valve opening, inverse obtains the Real-time Water flow Q2 of water pump Real-time Water flow Q1 or valve, specifically comprises:
1) according to the water pump curve equation that producer provides: H=f (Q1, u),
In formula: H---pump head, unit is m
Q1---pump capacity, unit is m
3/ h
U---water pump operation frequency, unit is HZ
Then pressure differential deltap P=ρ gH=ρ gf (Q1, u) at water pump two ends
In formula: Δ P---water pump two ends pressure reduction, unit is Pa
The density of ρ---water, unit is kg/m
3
G---acceleration of gravity, 9.8m/s
2
The water pump curve equation H=f (Q1 that can provide according to producer thus, u), or according to the pump characteristic equation H=f (Q1 that field measurement matching obtains, u), by water pump two ends pressure differential deltap P and the water pump operation frequency u of field monitoring, inverse obtains the Real-time Water flow Q1 of water pump; Wherein, because different water pump curve equation is different, and family curve equation form is various, so cannot provide concrete equation, water pump curve equation H=f (Q1, u) that can only provide according to producer calculates;
2) according to valve characteristic curve equation Δ P=g (Q2, K)), direct-detection valve two ends pressure differential deltap P and valve opening K, by valve characteristic curve equation Δ P=g (Q2, K)) inverse goes out the Real-time Water flow Q2 of valve,
In formula: Δ P---valve two ends pressure reduction, unit is Pa
Q2---valve flow, unit is m
3/ h
K---valve opening, unit is %.
2. a kind of method measuring heating ventilation air-conditioning system water pump or valve flow according to claim 1, it is characterized in that, described system water pump used is constant speed pump, now pump head H is the single-valued function H=f (Q1) of flow Q1, is namely the Q value that a H value can only be corresponding unique; Thus directly by field monitoring water pump two ends pressure differential deltap P, inverse obtains the Real-time Water flow Q1 of water pump.
3. a kind of method measuring heating ventilation air-conditioning system water pump or valve flow according to claim 1, it is characterized in that, described system valve used is on-off valve, now valve two ends pressure differential deltap P is the single-valued function Δ P=g (Q2) of flow Q2, because the family curve equation of different valve is different, and family curve equation form is various, so concrete equation cannot be provided, according to the Q value that a Δ P value can only be corresponding unique; Then directly by field monitoring valve two ends pressure differential deltap P, inverse obtains the Real-time Water flow Q2 of valve.
4. a kind of method measuring heating ventilation air-conditioning system water pump or valve flow according to claim 1, it is characterized in that, described step 1) in, as the pump characteristic equation H=f (Q1 having producer comparatively accurately to provide, u) time, can direct-detection water pump two ends pressure differential deltap P and water pump operation frequency u, by equation Δ P=ρ gH=ρ gf (Q1, u), inverse goes out pump capacity Q1.
5. a kind of method measuring heating ventilation air-conditioning system water pump or valve flow according to claim 1, it is characterized in that, described step 1) in, the pump characteristic equation provided when not having producer, or the pump characteristic error in equation that producer provides is larger, now need the pump capacity Q1 of field measurement, the running frequency u of water pump two ends pressure differential deltap P and water pump, wherein the measurement of pump capacity Q1 adopts ultrasonic flow meter, after measurement terminates, the lower ultrasonic flow meter of dismounting again, then according to the pump capacity Q1 of field measurement, the running frequency u of water pump two ends pressure differential deltap P and water pump, Function Fitting water outlet pump curve equation Δ P=f (Q1, u).
6. a kind of method measuring heating ventilation air-conditioning system water pump or valve flow according to claim 1, it is characterized in that, described step 2) in, the valve characteristic curve equation provided when not having producer, or the valve characteristic curve error in equation that producer provides is larger, now need the valve flow Q2 of field measurement, valve two ends pressure differential deltap P and valve opening K, wherein the measurement of valve flow can adopt ultrasonic flow meter, after measurement terminates, the lower ultrasonic flow meter of dismounting again, then according to the valve flow Q2 of field measurement, valve two ends pressure differential deltap P and valve opening K, Function Fitting goes out the family curve equation Δ P=g (Q2 of valve, K).
Priority Applications (1)
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|---|---|---|---|
| CN201510934868.3A CN105571844A (en) | 2015-12-15 | 2015-12-15 | Method for measuring heating ventilation air conditioning system water pump or valve flow |
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|---|---|---|---|
| CN201510934868.3A CN105571844A (en) | 2015-12-15 | 2015-12-15 | Method for measuring heating ventilation air conditioning system water pump or valve flow |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106050637A (en) * | 2016-06-03 | 2016-10-26 | 河北省电力建设调整试验所 | Online monitoring method for operation state of large-sized variable-speed water-feeding pump |
| CN106917741A (en) * | 2017-03-27 | 2017-07-04 | 天津三博水科技有限公司 | A kind of characteristic determination method of parallel water pump |
| CN110567045A (en) * | 2019-09-12 | 2019-12-13 | 北京市京海换热设备制造有限责任公司 | Method for virtually calculating flow of heat supply system |
| CN111811798A (en) * | 2020-06-30 | 2020-10-23 | 徐州晶睿半导体装备科技有限公司 | Waterway detection system and waterway detection method |
| TWI716813B (en) * | 2019-02-11 | 2021-01-21 | 勝新冷凍空調工程股份有限公司 | Central air conditioning system, flow valve and method for controlling thereof |
| CN112254320A (en) * | 2020-10-22 | 2021-01-22 | 重庆大学 | Adaptive variable differential pressure control method for air conditioner variable flow water system based on AI |
| CN112460326A (en) * | 2020-11-23 | 2021-03-09 | 中国华能集团清洁能源技术研究院有限公司 | System and method for monitoring flow of regulating valve based on sound wave sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106050637A (en) * | 2016-06-03 | 2016-10-26 | 河北省电力建设调整试验所 | Online monitoring method for operation state of large-sized variable-speed water-feeding pump |
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| TWI716813B (en) * | 2019-02-11 | 2021-01-21 | 勝新冷凍空調工程股份有限公司 | Central air conditioning system, flow valve and method for controlling thereof |
| CN110567045A (en) * | 2019-09-12 | 2019-12-13 | 北京市京海换热设备制造有限责任公司 | Method for virtually calculating flow of heat supply system |
| CN111811798A (en) * | 2020-06-30 | 2020-10-23 | 徐州晶睿半导体装备科技有限公司 | Waterway detection system and waterway detection method |
| CN112254320A (en) * | 2020-10-22 | 2021-01-22 | 重庆大学 | Adaptive variable differential pressure control method for air conditioner variable flow water system based on AI |
| CN112254320B (en) * | 2020-10-22 | 2021-08-24 | 重庆大学 | Adaptive variable differential pressure control method for air conditioner variable flow water system based on AI |
| CN112460326A (en) * | 2020-11-23 | 2021-03-09 | 中国华能集团清洁能源技术研究院有限公司 | System and method for monitoring flow of regulating valve based on sound wave sensor |
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Application publication date: 20160511 |