Optimal control device and method for primary pump variable flow system

Abstract

The invention discloses an optimal control device and an optimal control method for a primary pump variable flow system. The device comprises a refrigerator, a water pump, air conditioning cabinets, a water pump controller and a pressure difference optimal setting device, wherein the refrigerator, the water pump and the air conditioning cabinets are arranged on a water supply main pipe and a water return main pipe; the pressure difference optimal setting device is electrically connected with the water pump controller, control regulating valves and a pressure difference sensor respectively; and the water pump controller is electrically connected with a frequency converter, a flow sensor, a bypass regulating valve and the control regulating valves respectively. The optimal control method comprises the following steps that: the pressure difference optimal setting device detects valve position feedback signals; the maximum feedback signal is selected, and a valve position reaches or approaches the maximum opening; the water pump controller maintains the pressure difference between the water supply main pipe and the water return main pipe at a set value; and the bypass regulating valve is controlled to ensure that the flow of the refrigerator is not lower than the minimum flow allowed by the refrigerator. The device and the method have the advantages that the safe operation of a water system is ensured, and the requirement of each tail end air conditioning cabinet on water flow is met; and the device and the method can be widely applied to the fields of building energy conservation and air conditioning control of airports, stations, wharves and the like.

Description

technical field [0001] The invention relates to a system control device and method, in particular to an optimization control device and method for a primary pump variable flow system. Background technique [0002] The current water system generally adopts the constant flow system and the variable flow system in the current water system. The delivery power in the constant flow water system is provided by the constant speed pump. The constant flow water system cannot adjust the flow of the water pump according to the change of the building's air conditioning load, and consumes a lot of energy. The transmission power in the variable flow water system is generally provided by a water pump equipped with a frequency converter. The water pump continuously adjusts the speed according to the water demand of the water system to meet the water demand at the end of the system. The water system can be divided into a primary pump system and a secondary pump system. The secondary pump s...

AI Technical Summary

Problems solved by technology

Since the set value of the differential pressure is constant, if the load of other loops (terminals) is large, the control value of the differential pressure will not change and the valve will be fully opened, and it will not be able to obtain sufficient water flow, which will affect the thermal comfort of the terminal area

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