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System and method for controlling water discharge

A technology for controlling systems and water flow, applied in heating and ventilation control systems, heating and ventilation safety systems, heating methods, etc., to prevent reverse backflow

Active Publication Date: 2013-01-23
THE HONG KONG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a water flow control system and method in view of the defect that reverse backflow easily occurs in the bypass pipe in the chilled water system of the central air-conditioning secondary pump in the prior art

Method used

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  • System and method for controlling water discharge
  • System and method for controlling water discharge
  • System and method for controlling water discharge

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] figure 2 is a logical block diagram depicting a water flow control system according to an embodiment of the present invention, see figure 2 , the water flow control system 200 includes a flow direction detector 210 , a flow limit controller 220 , a differential pressure setpoint controller 230 , a secondary pump controller 240 , a remote differential pressure gauge 250 and a proximal differential pressure gauge 260 . Wherein, the flow flow direction detector 210 is arranged on the bypass pipe 150, and is used to measure the flow direction and the flow rate of the water flow flowing throug...

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Abstract

The invention discloses a system and a method for controlling water discharge. The method for controlling water discharge comprises the following steps of: starting a water discharge control system; collecting a water discharge value inside a by-pass pipe in a secondary pump chilled water system of a central air conditioner, and a near-end pressure differential value and a far-end pressure differential value of a use side in the secondary pump chilled water system of the central air conditioner; determining the maximal near-end pressure differential set value of the user side; determining the near-end pressure differential set value of the user side; comparing the collected near-end pressure differential value with the determined near-end pressure differential set value, and adjusting operating parameters of the secondary pump on the basis of a comparison result, and finishing the adjusting process of the secondary pump. The operating parameters of the secondary pump can be adjusted by virtue of the system and the method for controlling water discharge, so that the water discharge in a water supply pipe of the user side in the chilled water system of the central air conditioner is adjusted; and the condition that the water discharge inside a water return pipe of the user side is not greater than that in the water supply pipe of a host side is ensured, and reverse backflow in the by-pass pipe is prevented finally.

Description

technical field [0001] The invention relates to a control system and method, in particular to a water flow control system and method used in a traditional central air-conditioning secondary pump chilled water system. Background technique [0002] At present, the secondary pump variable flow system is often used in the central air-conditioning chilled water system of large buildings. figure 1 The central air-conditioning chilled water system in the prior art is depicted, see figure 1 , the chiller side (referred to as the host side) 110 adopts the configuration that each host corresponds to a fixed-speed pump (also called a primary pump) to ensure the constant flow operation of the chiller, while the terminal air treatment system (referred to as the user Side) 120 adopts a variable-speed water pump (also known as a secondary pump), and realizes variable-flow operation according to changes in user-side load. The commonly used secondary pump control method is differential pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/00F24F11/02
Inventor 王盛卫
Owner THE HONG KONG POLYTECHNIC UNIV
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