Intelligent and efficient machine room energy-saving method and system for central air-conditioning system

Abstract

The invention is suitable for the technical field of machine room energy saving, and provides an intelligent and efficient machine room energy-saving method and system for a central air-conditioning system, and the method comprises the following steps: a field controller analyzes and processes a signal collected by a sensor through an input module; outputting the control signal to an execution mechanism and carrying out local full-automatic control; a refrigeration station field controller collects operation state data of a refrigerator, and the field controller uploads the data to a transfer station control cabinet through a network and uploads the data to a central upper computer of a centralized monitoring layer through the Ethernet. And receiving monitoring and management instructions issued by the monitoring station to perform remote centralized management. On the premise of ensuring the cooling effect, the overall energy-saving control of electromechanical equipment in each refrigeration room is realized by taking the lowest overall energy consumption of all equipment in the refrigeration room of each workshop as a target, and the overall energy-saving operation is realized on the premise of ensuring the safe and stable operation of the refrigeration room.

Description

technical field [0001] The invention belongs to the technical field of machine room energy saving, and in particular relates to an intelligent and efficient machine room energy saving method and system for a central air-conditioning system. Background technique [0002] At present, in the central air-conditioning system, the general refrigeration room is equipped with 3 centrifugal chillers. They can respectively adapt to the cooling needs of the refrigeration room in different seasons. Taking into account the system characteristics under different working conditions and ensuring that the strategy used can fully meet the requirements of the system to achieve the highest possible COP efficiency. [0003] In order to meet the energy-saving needs of the computer room of the central air-conditioning system, in the usual energy-saving practices, the common energy-saving measures for the refrigeration room are the adjustment of a single device, such as only adjusting the frequenc...

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Problems solved by technology

[0003] In order to meet the energy-saving needs of the computer room of the central air-conditioning system, in the usual energy-saving practices, the common energy-saving measures for the refrigeration room are the adjustment of a single device, such as only adjusting The frequency of the water pump may only adjust the chilled water temperature, the cooling water temperature, or several parameters, but there is no coordinated control between all parameters, and the total energy consumption may not decrease but increase

[0004]In addition, under normal circumstances, the energy-saving operation of cooling towers, cooling water pumps and chilled water pumps is often contradictory to the energy saving of chillers. The operating frequency of the cooling water pump realizes energy saving, but the reduction of water flow into the chiller will lead to an increase in the outlet water temperature of the chiller, which in turn will cause an increase in the pressure of the refrigerant circulating inside the chiller, which will eventually lead to a decrease in the efficiency of the chiller. Elevated consumption

[0005] Therefore, the total energy consumption of chiller and water pump may not decrease but increase; generally, chiller efficiency can be increased by 1% for every 1 degree Fahrenheit increase in chilled water outlet temperature , but at the same time as the chilled water outlet temperature increases, in order to provide the same cooling capacity, the operating frequency and energy consumption of the chilled water pump will also increase accordingly, and the total energy consumption of the chiller and water pump may not decrease but increase

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