High-efficiency refrigeration plant room design summary and discussion

Wuhan Optics Valley Joy City is located in the Optics Valley Development Zone of Wuhan City, which includes a shopping center, a Grade A office building and a basement. Among them, the shopping center is a commercial complex integrating retail, catering, cinema and other functions, with 6 floors above ground and 3 floors below ground, and 1 floor below ground locally equipped with retail, catering and supermarkets, with a total floor area of 136,446 m2 above and below ground.

Wuhan's summer climate is characterized by high temperature and high humidity, and the cooling cycle is longer, so its air conditioning and ventilation energy consumption is higher than that of general public buildings. According to relevant research, 90% of the refrigeration plant rooms in China have an average annual energy efficiency ratio of 2.5-3.5, and if some reasonable and reliable technical means are used to improve the energy efficiency of refrigeration plant rooms from 3.5 to 5.0, the power consumption of refrigeration plant rooms can be reduced by 30%. This paper mainly summarizes and discusses the design of high-efficiency refrigeration room in the shopping center of the project.

Cold source group control system can further realize intelligent operation, effect prediction test and self-learning control from automatic operation, and can regulate energy-saving operation according to local meteorological real-time data, for example, the water supply temperature setting value is reset according to the outdoor wet-bulb temperature, the cooling tower outlet temperature setting value is reset according to the outdoor wet-bulb temperature, the chilled-water temperature difference is reset according to the most unfavorable point of the cooling effect, and the number of chiller units is controlled optimally. The load rate interval is self-learning according to the operation data, etc., which can further realize the fine control of the system, and thus improve the operation energy efficiency ratio of the refrigeration plant room.
 

When designing high-efficiency refrigeration plant room, it should optimize the design scheme of air-conditioning cold and heat source, transmission and distribution, terminal and control system on the basis of 8,760 h dynamic load calculation and analysis of the building, break down the expected targets layer by layer and special cracks, and form a closed-loop from the target-setting to the design stage, and then to the bidding, construction quality management and acceptance and commissioning.

In the design of high-efficiency refrigeration plant room in Wuhan Optics Valley Joy City, a large number of optimized design solutions, such as the use of 135 ° beveled elbow and diagonal flow tee, low-resistance valves and other measures to reduce the resistance of the pipeline network, as well as the use of high-efficiency chiller units, etc., but in the actual landing of the project, there is a slight deviation, if you can strengthen the bidding and construction quality management, so that the design is really on the ground, then the refrigeration plant room operation energy efficiency ratio can also be Further enhancement of the operational energy efficiency ratio can even reach more than 5.6.