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Analysis of Refrigeration and HVAC Impacts on Supermarket Energy Performance (RP-1467) 制冷和暖通空调对超市能源性能的影响分析(RP-1467)
本文基于ASHRAE研究项目RP-1467的研究结果。这项工作是在ASHRAE研究项目RP-1467下完成的,该项目平衡了陈列柜和商店舒适性冷却之间的潜热负荷。总体目标是通过优化暖通空调和制冷系统的设计和运行,全面评估超市的节能潜力。该研究探讨了超市设计、暖通空调和制冷系统设计、温度和湿度设定点以及商店位置的影响。该研究使用EnergyPlus(DOE 2011)作为超市建模的模拟工具,总体上发现在单个变量水平上,测量结果和预期结果都符合得很好。根据对超市行业从业人员和美国能源部国家实验室的调查,开发了一个原型商店。 对原型商店进行了参数和分数因子分析,以探索超市和系统特征对能源性能的影响。结果表明,与最初的预期相反,暖通空调因素对超市能耗的影响相对较小。制冷因素主导着超市的能源问题,超市暖通空调设计、分区或湿度设定点的变化对整体影响不大。影响最大的制冷因素是制冷量、箱子布局和排列,以及影响箱子对商店环境的显式和潜在制冷效果的因素。此外,相同的制冷因素对暖通空调系统的尺寸和能耗有主要影响。不幸的是,HVAC设计因素的影响,包括气流速率、需求控制通风、热管、盘管回路和区域设定点,导致存储能量变化小于1%。 虽然这种小的相对节约可能代表着巨大的绝对成本,但影响超市能源使用的认真努力不应集中在暖通空调策略上。引文:2017年冬季会议,内华达州拉斯维加斯,《交易》,第123卷,第一部分
This paper is based on findings resulting from ASHRAE Research Project RP-1467.The work was completed under ASHRAE Research Project RP-1467,Balancing Latent Heat Load between Display Cases and Store Comfort Cooling. The overall objective is to provide a comprehensive assessment of the potential for energy savings in supermarkets by optimized design and operation of the combined HVAC and refrigeration systems. The research addresses the impact of supermarket design, HVAC and refrigeration system design, temperature and humidity set points, and store location. The study uses EnergyPlus (DOE 2011) as the simulation tool for modeling supermarkets and generally found good agreement with both measured results and expected outcomes on an individual variable level. A prototypical store was developed based on surveys of practitioners in the supermarket industry and the DOE national laboratories. Parametric and fractional factorial analyses were conducted on the prototype store to explore the impact of supermarket and system characteristics on energy performance. The results show that, contrary to initial expectations, the HVAC factors have relatively little influence over supermarket energy consumption. Refrigeration factors dominate supermarket energy issues, and changes to the HVAC design, zoning, or humidity set points of the supermarket have little overall influence. The refrigeration factors with the greatest influence are refrigeration capacity, case layout and lineup, and factors that affect the sensible and latent cooling effect of the cases on the store environment. Furthermore, the same refrigeration factors have a dominant influence on the HVAC system sizing and energy consumption. Unfortunately, the impact of HVAC design factors, including airflow rates, demand controlled ventilation, heat pipes, coil circuiting, and zone set points, results in store energy changes of less than 1%. While this small relative savings may represent significant absolute costs, serious efforts to affect supermarket energy use should not focus on HVAC strategies.
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