Cold (warm) water circulation energy efficiency control method and cold (warm) water circulation energy efficiency control device for central air-conditioning system

Abstract

The invention relates to a cold (warm) water circulation energy efficiency control method for a central air-conditioning system, which is characterized in that a water outlet end of an air conditioning unit of a circulation loop is respectively provided with temperature and pressure detections; a water outlet end of an air conditioning load is respectively provided temperature and pressure detections; temperature and pressure detections are respectively arranged between water inlets of a water pump and the air conditioning unit; a cold (warm) water shunt bypass valve is an electrical control valve; and a variable volume pump and the electrical control valve are respectively controlled by detecting the air conditioning unit and the air conditioning load. The water pump and / or the bypass shunt valve are adjusted by respectively detecting the temperature and the pressure at both ends of the air conditioning unit and the air conditioning load so as to meet the requirements of the air conditioning unit, the air conditioning load and the air conditioning effect for the flow rate to achieve the effect that under the best using effect, the system works in the best energy efficiency state,has adaptive ability and can save electric energy over 50 percent.

Description

technical field [0001] The invention relates to a method for controlling the energy efficiency of cold (warm) water circulation in a central air-conditioning system, in particular to a method for controlling the energy efficiency of cold (warm) water circulation in a central air-conditioning system which can ensure the air-conditioning effect required by users and save energy consumption to the greatest extent. Background technique [0002] The cold (warm) water cycle of the central air conditioner consists of the air conditioner unit, the air conditioner load (indoor fan coil unit), and the water pump connected in series to form a closed circuit. (Warm) water circulates between the unit and the load to realize cooling or heating of the load. The design of the central air-conditioning system is designed according to the maximum use requirements. However, most of the time in actual operation is under the condition of less than the maximum value. A large number of statistics s...

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Problems solved by technology

They still only have temperature detection, but no flow (pressure) detection, and the above-mentioned shortcomings of the temperature control type have not been overcome; secondly, the bypass circuit connected to both ends of the evaporator can only play a single on / off function, and cannot control the unit. If the flow rate is adjusted linearly, the best energy efficiency of the pump cannot be guaranteed.

[0005] Chinese patents CN1601193, CN2703223, CN201335489, CN2898692, CN1654893, etc., although there is a pressure point in the system, it is only used as a monitoring signal and cannot realize mutual control of differential pressure. not resolved

[0006] Chinese patent CN1598427 central air-conditioning chilled water system fuzzy predictive control method, although pressure difference samplers are added at both ends of the bypass loop, it is only used for bypass compensation of the minimum flow of the unit, and cannot realize the regulation of the load flow, which is still the temperature difference Control type; secondly, a single differential pressure acquisition cannot reflect the actual pressure of the water and return pipes, and cannot be protected in terms of pressure

This kind of control device, because the modules are connected by lines, is prone to electromagnetic interference, so the anti-interference ability is low; and the installation of multiple nodes is prone to errors and difficult adjustments, which lead to poor stability of the control device; in addition, the combination of multiple modules is expensive. , larger volume

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