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Author/Shenzhen Taiwa Energy Technology Co., Ltd.

Keywords: high-efficiency computer room variable flow system COP central air-conditioning system green building

Abstract: High-efficiency machine room is a popular concept in the design and installation of air-conditioning machine rooms in the HVAC industry. It is also an important energy-saving measure that is currently in full swing in the field of mechanical and electrical energy conservation in buildings around the world. Through the optimization of machine room configuration, pipeline optimization and matching Corresponding frequency conversion measures and convenient flow control systems are used to achieve the new way and trend of the most energy-saving COP energy efficiency value of the entire air-conditioning room system.

Definition of high-efficiency computer room: At present, in the entire industry, the definition of high-efficiency computer room has not yet formed a nationwide consensus and national standard. At present, the understanding of high-efficiency computer room refers to the annual average energy efficiency ratio of the cooling computer room system. (EER) above 5.0, but there is still some ambiguity about the calculation process and the content of the work scope of the calculation. According to the Guangdong Provincial Central Air Conditioning and Refrigeration Room System Energy Efficiency Monitoring and Monitoring Standard (DBJ/T15-129-2017), the minimum energy efficiency requirements are set in the design stage and operation stage, and the classification is as follows:

Design of high-efficiency computer room: The design of high-efficiency computer room first requires the configuration and selection of the refrigeration host, mainly following the following three principles: 1. Select as few large-capacity refrigeration units as possible; 2. Ensure that the refrigeration units are at high load as much as possible 3. The average load of multiple units reduces the complexity of the system.

Secondly, the system's requirements for the refrigeration host: 1. Matching variable flow: 50% - 100% variable flow for conventional refrigeration host; 30% - 100% variable flow for custom variable flow host; differential pressure bypass is set according to the variable flow of the refrigeration host offline. 2. The evaporative condensation temperature is designed for approaching temperature. In general, in the selection, it is necessary to consider the low water resistance of the evaporator and condenser; the flow rate has a large range of change and a high rate of change, which can adapt to the operation of variable water volume conditions.

Construction and measures of high-efficiency computer room: no matter how good the design of high-efficiency computer room is, it also needs to deepen and cooperate in the construction process. For the deepening and construction of high-efficiency computer room, our company has summarized the experience of the deepening and construction of high-efficiency computer room, and the focus is on optimization. Pipeline layout, reduce local resistance, adjust the specific friction resistance of the pipeline, optimize the pipeline layout, reduce the head by reducing the water flow velocity in the pipeline and removing unnecessary valves. The sub-items are as follows: try to avoid pipe bends;

Water pump inlet, low-resistance angle-pass automatic backwash filter;

Pump outlet, low resistance eccentric ball check valve;

45° elbow instead of 90° elbow;

Cancel unnecessary valves, filters;

Use the main pipe to replace the sub-catchment;

Reasonably adjust the installation position of the valve;

Reasonably set bypass pipes to protect main equipment;

The cooling tower uses the main pipe type pipeline to return water;

Reasonable flow distribution of parallel main pipes of chillers, etc.;

Refine the hydraulic calculation of the pipeline in the computer room;

Technically control the pressure of accessories other than the main equipment in the computer room;

BIM drawing to guide on-site construction and reduce construction errors;

Control the quality of the construction process, strictly implement process standards, and quality control standards