Economical operation method for central air conditioning system

Abstract

The invention relates to an economical operating method of a central air-conditioning system, comprising the following steps: cold accumulation operation, i.e. a control system controls the closing of a valve at the inlet end of a fan coil, valves at two ends of a cold accumulation groove are open, refrigerating water comes out of the evaporator of a refrigerating main machine and enters the cold accumulation groove through a valve, the refrigerating water and cold accumulation medium in the groove undergo heat exchange, and the refrigerating water subject to the heat exchange is jointed at the collector pipe of the cold accumulation groove and is conveyed to the evaporator of the refrigerating main machine by a refrigerating water pump for purpose of temperature reduction, thus the cold accumulation circulation is completed; and cold supply operation, i.e. a monitor of a control system is used for monitoring the environment temperature and the air-conditioning load change and calculates which working condition of the compressor of the refrigerating main machine leads to the highest energy efficiency, a frequency converter is used for changing the rotation speed of the centrifugal compressor so that the compressor can work in the optimum working condition, the cold accumulation groove provides cold load for the sake of sufficient cold load, and surplus cold is stored in the cold accumulation groove. The invention causes the refrigerating main machine of the central air-conditioning system to keep operating with the highest efficiency, without being influenced by the change of the outside air temperature or the air-conditioning load, and the invention causes the refrigerating main machine of the central air-conditioning system to save energy to the maximum extent.

Description

technical field [0001] The invention relates to an economical operation method of HVAC, in particular to an economical operation method of a central air-conditioning system. Background technique [0002] Nowadays, in the centralized air-conditioning system, the energy efficiency ratio of the centrifugal refrigeration unit is greatly improved after adopting the frequency conversion technology, but the improved energy efficiency ratio has certain limitations. However, there is a large amount of time throughout the year that does not operate within this range, and the best energy-saving effect is limited. In addition, the control system of the centralized air-conditioning system can generally realize functions such as alarm, parameter display, and equipment linkage start and stop, but it requires monitoring personnel to manually judge and manually control the conversion of various operating conditions according to weather conditions, electricity price factors, and load conditio...

AI Technical Summary

Problems solved by technology

[0002] Nowadays, in the centralized air-conditioning system, the energy efficiency ratio of the centrifugal refrigeration unit is greatly improved after adopting the frequency conversion technology, but the improved energy efficiency ratio has certain limitations. However, there is a large amount of time throughout the year that does not operate within this range, and the best energy-saving effect is limited

In addition, the control

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