Air conditioning system and control method of air conditioning system

Abstract

The invention relates to an air-conditioning system and a control method for the air-conditioning system. The air-conditioning system comprises: a refrigeration unit, including a water inlet for introducing cooling water and a water outlet for discharging cooling water; a plurality of cooling towers, arranged in parallel and each comprising: The inlet communicated with the water outlet of the refrigeration unit and the outlet communicated with the water inlet of the refrigeration unit; a plurality of water pumps are arranged in parallel and each includes an outlet communicated with the water inlet of the refrigeration unit and an inlet communicated with the water outlet of the refrigeration unit, so as to The cooling water is circulated between the refrigeration unit and the cooling tower; a plurality of control valves are arranged in a one-to-one correspondence with the plurality of cooling towers to control whether the corresponding cooling towers work; and a controller is connected in communication with the plurality of control valves And configured to: obtain the total rated flow Q1 of the working cooling tower and the total flow Q2 of multiple pumps, and increase the number of working cooling towers when Q1<Q2, and reduce the working cooling tower when Q1>2*Q2 quantity.

Description

technical field [0001] The present invention relates to the technical field of refrigeration, in particular, to an air conditioning system and a control method of the air conditioning system. Background technique [0002] In the large central air conditioning system, the cooling tower is used as the terminal equipment, relying on the cooling water pump to discharge the heat from the refrigerator (load end) to the atmosphere through the cooling water. For a long time, due to the large proportion of energy consumption of refrigerators and air-conditioning boxes, energy-saving technology research has mainly focused on refrigerators and air-conditioning boxes; while cooling towers are the end equipment for heat discharge, their energy-saving control has not been paid attention to. In general, the chillers, cooling water pumps, and cooling towers are installed online by multiple devices. When the load is reduced, the number of chillers, cooling water pumps, and cooling towers in ...

AI Technical Summary

Problems solved by technology

In general, refrigerators, cooling water pumps, and cooling towers are all installed on-line with multiple devices. When the load decreases, the number of refrigerators, cooling water pumps, and cooling towers will be reduced at the same time. For cooling towers that are out of operation, cooling will not be allocated. Water, the cooling tower is idle, and the energy efficiency of the equipment is not fully utilized

In addition, the motors of conventional cooling water pumps and cooling towers are running at full power, and the temperature of the cooling water entering and leaving the water varies with the load of the refrigerator and the ambient wet bulb temperature. Under this operating condition, the cooling tower may be in a large flow , low temperature difference, or in the state of under flow and high temperature difference, which can neither keep the refrigerator in an energy-efficient operation state, but also waste the energy consumption of cooling water pumps and cooling tower fans, which has a large energy-saving space; existing The research on energy-saving control in China usually sets a fixed temperature difference between the inlet and outlet water of the cooling tower, and adjusts the frequency conversion of the fan of the cooling tower. It does not make effective adjustments according to the load of the refrigerator and the change of ambient temperature and humidity, and the energy-saving space is limited.

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