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A chilled water variable flow energy saving control method and control system

A chilled water system and energy-saving control technology, applied in heating and ventilation control systems, air-conditioning systems, heating and ventilation safety systems, etc., can solve problems such as the mismatch between the system and the terminal load, hydraulic imbalance, and inability to timely feedback terminal load changes, etc. , to achieve the effects of reducing hydraulic imbalance, enhancing consistency, and satisfying accuracy and timeliness

Active Publication Date: 2018-10-26
SHENZHEN XINHUANNENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a chilled water variable flow energy-saving control method and control system, aiming to solve the problem in the prior art that the change of the terminal load cannot be fed back in time, so that the system cannot match the terminal load and cause water imbalance

Method used

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  • A chilled water variable flow energy saving control method and control system
  • A chilled water variable flow energy saving control method and control system
  • A chilled water variable flow energy saving control method and control system

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Embodiment 1

[0036] see figure 1 and figure 2 , Embodiment 1 of the present invention provides a chilled water variable flow energy-saving control method, comprising the steps of:

[0037] S10. According to the design data, obtain the design flow rate of the chilled water system as Q 0 , the design differential pressure is ΔP 0 ,calculate

[0038] S20, continuously adjust the opening of the electric valves of each air-conditioning unit, the impedance Si of each parallel pipe section changes; the chilled water flow Q changes; record each change value;

[0039] Specifically, in the actual operation process, when the electric valves of each air-conditioning unit are continuously adjusted, the impedance coefficient S of each pipe section i All change, in this example, S i for S 1 , S 2 , S 3Both change, i is a natural number; the chilled water flow Q changes, and the impedance coefficient S is recorded when the electric valve is continuously adjusted. 1 , S 2 , S 3 , the value of...

Embodiment 2

[0054] see image 3 Embodiment 2 of the present invention provides a chilled water variable flow energy-saving control system. In this embodiment, the chilled water variable flow energy-saving control system is used to control the flow of water through the end user, which can make the flow of the water pump more compatible with the end load, which is extremely The operating cost is greatly reduced, and by enhancing the consistency between the actual flow and the design flow in the pipe network, the phenomenon of hydraulic imbalance is greatly reduced, and the system operation is more energy-saving and efficient.

[0055] The chilled water variable flow energy-saving control system includes a controller 201, a differential pressure sensor 231 connected to the controller 201, a frequency converter, and a flow meter 221. The frequency converter is connected to a refrigeration pump, and one end of each refrigeration pump corresponds to A frequency converter is connected, and elect...

Embodiment 3

[0063] see Figure 4 and Figure 5 , which provides a chilled water variable flow energy-saving control system for Embodiment 3 of the present invention. This embodiment is basically the same as the above-mentioned Embodiment 2. The difference is that in this embodiment, the number of frozen pumps is set as Three, namely the first refrigeration pump 111 , the second refrigeration pump 112 , and the third refrigeration pump 113 . Each of the refrigerating pumps is correspondingly connected to a frequency converter, and each frequency converter synchronously adjusts the refrigerating pumps connected thereto. That is, the first refrigeration pump 111 is connected to the first frequency converter 211 , the second refrigeration pump 112 is connected to the second frequency converter 212 , and the third refrigeration pump is connected to the third frequency converter 213 . The first frequency converter 211 , the second frequency converter 212 and the third frequency converter 213 ...

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Abstract

The invention discloses a chilled water flow-variable energy-saving control method and system and belongs to the field of energy-saving control. The method includes: according to design data, acquiring design flow Q0 and design pressure difference delta P0 of a chilled water system, calculating, and constantly adjusting opening degree of an electric valve of each air conditioning unit; calculating total resistance coefficient S according to relation between total resistance coefficient S of parallelly-connected pipe sections and resistance Si of each parallelly-connected pipe section; calculating set pressure difference delta P of the chilled water system; detecting actual pressure difference delta P of the chilled water system, comparing deviation between the actual pressure difference delta P and the set value delta P, and using a PID (proportion, integration and differentiation) adjusting output control signal to control a variable frequency drive (VFD) for frequency adjusting. A pressure difference is controlled in real time by combining with changes of a tail-end valve, so that the system and a tail-end load are matched better; by improving uniformity of actual flow and design flow in a pipe network, hydropower disorder is reduced greatly.

Description

technical field [0001] The invention relates to the technical field of energy-saving variable flow of chilled water, in particular to a variable-flow energy-saving control method and control of chilled water. Background technique [0002] Chilled water variable flow regulation system is a basic regulation form of water system. It is widely used in some domestic engineering projects, especially the air-conditioning systems of office buildings, buildings and other buildings. [0003] According to the different layout of the pumps, the variable flow system can be mainly divided into a fixed-speed pump variable flow system, a primary pump variable flow system, a secondary pump variable flow system, and a tertiary pump variable flow system. Among them, the secondary pump variable flow system is currently the most widely used variable flow system, especially in some large high-rise civil buildings and multi-functional buildings. In the side pipeline of the machine room of the se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F5/00F24F11/64F24F11/85F24F11/84F24F140/12
CPCF24F5/0003F24F11/30F24F11/89F24F2110/00F24F2140/20
Inventor 李光裕钟如仕杜军
Owner SHENZHEN XINHUANNENG TECH