Li Honglian,Wang Miao,Yang Yi,et al.Generation Method of Design Days for Indirect Evaporative Cooling Air Conditioning under Different Operating Modes[J].Journal of Refrigeration,
Li Honglian,Wang Miao,Yang Yi,et al.Generation Method of Design Days for Indirect Evaporative Cooling Air Conditioning under Different Operating Modes[J].Journal of Refrigeration,DOI:10.12465/issn.0253-4339.20251016002.
Generation Method of Design Days for Indirect Evaporative Cooling Air Conditioning under Different Operating Modes
Current evaporative cooling air conditioning systems adopt traditional HVAC design parameters as their design conditions, using extreme weather conditions as design day parameters, which overlooks the coupling between the diversity of evaporative cooling operation modes and meteorological factors. This study considers data centers as the research object and proposes a new method for generating design days based on the operational characteristics of indirect evaporative cooling air-conditioning systems in dry, wet, and mixed modes. First, a TRNSYS model was established for an indirect evaporative cooling air-conditioning system in data centers, with the supply air temperature serving as the criterion for determining the operation mode. The climatic features corresponding to the hourly outdoor dry- and wet-bulb temperatures under the three switching modes were extracted. By combining conventional principal component analysis and the weighted dynamic time warping method, the meteorological days most similar to these characteristic sequences were identified from historical weather data, thereby generating design-day parameters for different operation modes. The results show that, compared with the original design parameters, the peak cooling loads generated by the new method under the three operating modes exhibit relative deviations from the actual design loads of 0.15%, 0.03%, and 0.41%, respectively. The design-day parameters proposed in this study effectively mitigated the design redundancy issues associated with the original parameters, thereby better satisfying the accuracy requirements of the engineering design.
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