本文介绍了两个超市的现场监测数据，评估了空间湿度对制冷系统能耗的影响。两家商店都使用直接数字控制（DDC）系统来收集15分钟的监测数据。在明尼阿波利斯的A店，DDC系统用于监控系统性能，并在16个使用热气除霜的冷藏区实施温度终止控制，而不是时间终止控制。在印第安纳波利斯的B店，DDC系统用于量化带电动除霜的单压缩机机架系统的性能趋势。 B店的结果表明，空间相对湿度每下降1%，制冷系统能耗就会减少近10 kWh/天，约为系统年平均能耗的0.4%。该值包括潜在负荷减少的影响、电除霜加热器运行减少导致的直接能耗和外加负荷减少，以及防汗加热器能耗减少导致的较小外加负荷。测量的减少量与使用豪厄尔（Howell，1993b）在ASHRAE研究项目596中开发的计算方法预测的影响一致。 在商店A，测量数据显示，在平均空间湿度为22%相对湿度的冬季，实施温度终止除霜可减少制冷系统能耗近70 kWh/天。每降低1%的相对湿度，温度终止除霜节省的电量就会增加4 kWh/天。在这两家商店，使用相同类型的机械控制装置根据商店露点对防汗加热器进行工作循环。观察到防汗加热器的用电量减少了4%。 相对湿度每下降1%，B店为6 kWh/天，A店为3.4 kWh/天。在A店，使用DDC系统实施了更积极的控制方案，将防汗加热器的能耗每%RH减少7.8 kWh/天。据报道，更积极的控制方法可适当控制显示屏表面的雾化和冷凝。两个门店的总能量折减系数分别为A门店每%RH 12 kWh/天和B门店每%RH 15 kWh/天。具有更大的抗干扰能力- 汗液加热器控制，每%RH的减少系数高达20 kWh/天似乎是可能的。单位:I-PCITION:研讨会，ASHRAE交易，第105卷，pt。1.

This paper presents field-monitored data from two supermarkets where the impact of space humidity on refrigerating system energy use was evaluated. Direct digital control (DDC) systems were used at both stores to collect 15-minute monitored data. At Store A in Minneapolis, the DDC system was used to monitor system performance as well as to implement temperature-terminated control in place of time-terminated control on 16 refrigerated zones using hot gas defrost. At Store B in Indianapolis, the DDC system was used to quantify the performance trends for the single compressor rack system with electric defrost.The results at Store B showed that refrigerating system energy use decreases by nearly 10 kWh/day for each 1% drop in space relative humidity, or about 0.4% of average annual system energy use. This value includes the impact of reduced latent loads, the reduction in direct energy use and imposed load from reduced electric defrost heater operation, and the smaller imposed load from reduced anti-sweat heater energy use. The measured reductions agree well with the impact predicted using the calculation methods developed by Howell (1993b) in ASHRAE Research Project 596.At Store A, the measured data show that implementing temperature-terminated defrost reduced refrigerating system energy use by nearly 70 kWh/day over the winter period when the average space humidity was 22% RH. The savings from temperature-terminated defrost increase by 4 kWh/day per each 1% drop in relative humidity.At both stores, the same type of mechanical controls were used to duty cycle the anti-sweat heaters based on store dew point. Anti-sweat heater electricity use was observed to decrease by 4.6 kWh/day at Store B and 3.4 kWh/day at Store A for each 1% drop in relative humidity. At Store A, a more aggressive control scheme was implemented with the DDC system that reduced anti-sweat heater energy use by 7.8 kWh/ day per % RH. The more aggressive control approach was reported to properly control fogging and condensation on display case surfaces.The overall energy reduction factor at the two stores was 12 kWh/day per % RH at Store A and 15 kWh/day per % RH at Store B. With more aggressive anti-sweat heater control, reduction factors as high as 20 kWh/day per % RH appear to be possible.Units: I-P