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Energy-conserving control method for adjusting water pump number in synchronization speed changing flow quantity changing heating system

A heating system, energy-saving control technology, applied in the heating system, space heating and ventilation details, heating methods, etc., can solve the problems of constant application, high energy consumption, unreasonable adjustment, etc.

Inactive Publication Date: 2009-08-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the disadvantages of high energy consumption, unreasonable adjustment and constant application in the operation method of the circulating water pump adopting variable speed and variable number coordinated adjustment in the variable flow heating system, and proposes to adjust the synchronous variable speed and variable flow supply. Energy saving control method for the number of water pumps in the heating system

Method used

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  • Energy-conserving control method for adjusting water pump number in synchronization speed changing flow quantity changing heating system
  • Energy-conserving control method for adjusting water pump number in synchronization speed changing flow quantity changing heating system
  • Energy-conserving control method for adjusting water pump number in synchronization speed changing flow quantity changing heating system

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Experimental program
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specific Embodiment approach 2

[0014] Specific implementation mode two: combination figure 1 Describe this embodiment, the steps of this embodiment are as follows:

[0015] Step 1: Initialize the controller 4; set the single water pump 1 provided in the sample of the selected model water pump 1 at the rated speed n 0 The flow rate, lift, power and efficiency values ​​of the lower operating point are input into the controller 4, and the controller 4 obtains the characteristic curve of a single water pump 1 through mathematical fitting; the controller 4 obtains the parallel synchronous The characteristic curve at the time of frequency conversion speed regulation; then input the set flow rate of the heating network pipe network and the pipe network resistance under the set flow rate into the controller 4, and the controller 4 calculates the resistance characteristic curve of the pipe network; finally, the water pump motor and the pipe network resistance The efficiency of the water pump inverter is input into ...

specific Embodiment approach 3

[0018] Embodiment 3: This embodiment is a further description of step 1 in Embodiment 1. Step 1 is to turn the single water pump 1 provided in the sample of the selected model water pump 1 at the rated speed n 0 The flow, head, power and efficiency values ​​of the lower operating point are input into the controller 4; the controller 4 uses the least square method to perform polynomial fitting on the input data, and the form of the polynomial is as formula 1:

[0019] H = H 0 + A 1 Q + A 2 Q 2 N = ...

specific Embodiment approach 4

[0044] Embodiment 4: This embodiment is a further description of Step 2 in Embodiment 1. Step 2 is to input the design working point parameters of the pipe network into the controller 4, and the resistance of the pipe network can be obtained according to formula 4. The resistance characteristic coefficient S of the pipe network in the characteristic curve formula, and then the efficiency of the water pump motor obtained by formula 5 and the efficiency of the water pump frequency converter obtained by formula 6 are input into the water pump frequency converter 2, and the water pump 1 should meet when switching Conditions for flow, head and efficiency to be equal:

[0045] Q i = Q i - 1 ...

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Abstract

The invention provides an energy-saving control method for adjusting the number of water pumps in a synchronous variable-speed variable-flux heat supply system, relating to the field of controlling the variable-flux heat supply system and aiming at overcoming the defects that the existing method has high energy consumption, unreasonable adjustment and unchanged application. The method comprises the following steps of: firstly, initiating the controller; subsequently, calculating m-1 shifting points; finally, carrying out the shift of the number of the water pumps in running; with the change of the flux of the pipe network, emitting an instruction by a controller to the frequency conversion speed regulator of the water pump to carry out the shifting operation if the total flux value of the pipeline network at a certain time is equal to the flux value of the shifting point obtained by the calculation; if not, continuously carrying out connecting in parallel a plurality of pumps so as to run synchronously with a frequency-conversion and speed-regulation way. The method is applicable to the variable-flux heat supply system which adopts a plurality of circulation water pumps to run in parallel. The way takes the total energy consumption of the water pump as the target function, and ensures that the water pump can always runs at the working condition with the lowest energy consumption; therefore, when the way is adopted, the energy consumption can achieve the minimum, the realization method is simple and easy and the energy is saved by 10%-15% compared with the traditional way.

Description

technical field [0001] The invention relates to the field of control of variable flow heating systems. Background technique [0002] For the variable flow heating system, the water pumps are connected in parallel and run at a constant speed, which results in a large waste of energy. [0003] Although the non-synchronous variable speed scheme can reduce the investment in the frequency converter to a certain extent, its operation is quite complicated. If it is not operated properly, it will not save energy, but will increase the energy consumption of the system. [0004] It is also unreasonable and not energy-saving to use multiple water pumps for variable frequency speed regulation throughout the heating season. [0005] In the cooperative adjustment method of variable speed adjustment and number of operating units control, it is unreasonable to use the adjustment mode of single water pump operation when the flow rate provided by a single water pump meets the requirements. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24D19/10
CPCY02B30/745Y02B30/70
Inventor 王昭俊姜永成董立华张治菊
Owner HARBIN INST OF TECH
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