Air conditioning system based on energy efficiency assessment and optimized control and method thereof

Abstract

The invention relates to the field of the assessment and control on the energy efficiency of air conditioning systems and aims at providing an air conditioning system based on energy efficiency assessment and optimized control and a method thereof. A fresh air temperature sensor, a return air temperature sensor, a return air humidity sensor, a supply air flow sensor and a supply water temperature sensor of the system are connected to a PLC (Programmable Logic Controller) through an input end of a cabinet, and the PLC is connected to a motor, an electronic dynamic flow balance valve, a fresh air valve and a return air valve of an air blower of an air conditioning unit through an output end. According to the system and the method, intelligent valves are mounted at a chilled water system and an air conditioning terminal, chilled water supply temperature, chilled water supply pressure, outdoor temperature and terminal switching signals serve as input and output points; all signals and flows serve as communication points of the intelligent valves MODBUS, energy efficiency coefficients of all systems are calculated according to an assessment method and then are subjected to optimization analysis in a control device, intelligent control data are changed, the energy efficiency of the system is increased greatly, and then, the effects of saving energy and lowering consumption are reached.

Description

technical field [0001] The invention relates to the field of energy efficiency evaluation and control of an air conditioning system. More specifically, the present invention relates to an air conditioning system based on energy efficiency evaluation and optimal control and its method. Background technique [0002] Central air conditioning is the main energy consumption part of modern buildings. According to statistics, the electricity consumption of central air-conditioning accounts for more than 70% of the total electricity consumption of various buildings, and the central air-conditioning equipment fluctuates under 70% load 97% of the time, and the actual air-conditioning load is only about 50% of the equipment capacity on average. As a result, the phenomenon of "big horses and small carts" appeared, resulting in huge waste. Moreover, during the operation of the air conditioner, each motor is fixed at full speed at power frequency for a long time, and the flow of circula...

AI Technical Summary

Problems solved by technology

According to statistics, the electricity consumption of central air-conditioning accounts for more than 70% of the total electricity consumption of various buildings, and the central air-conditioning equipment fluctuates under 70% load 97% of the time, and the actual air-conditioning load is only about 50% of the equipment capacity on average. As a result, the phenomenon of "big horses and small carts" appeared, causing huge waste

Moreover, during the operation of the air conditioner, each motor is fixed at full speed at power frequency for a long time, and the flow of circulating water is adjusted through the throttle valve and bypass valve. It is difficult to achieve real-time matching of water flow and cooling capacity, resulting in water system In the long-term high energy consumption operation state of "large flow, small temperature difference", and reduce the COP of the refrigeration unit

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