超市制冷系统项目旨在研究和开发新的高效节能超市制冷系统。对超市制冷系统进行了分析、设计和测试，该系统包括不等并联压缩机、带浮头压力控制的冷凝器和基于微处理器的电子控制系统。系统总容量为35 hp（26.10 kW），由三台5、10和20 hp（3.73、7.46和14.91 kW）的压缩机组成，这三台压缩机被确定为最佳数量和容量分布。与传统超市制冷系统的理论比较表明，三个不相等的并联压缩机系统- 12年的最大年节能量为29100 kWh，或26%，R-502年的最大年节能量为20100 kWh，或15%。设计了压缩机容量控制算法，通过将压缩机容量与制冷负荷相匹配，为每种工况选择最佳压缩机组合。选择微处理器系统进行系统控制和数据采集。经济分析表明，在三年或更短的投资回收期内，根据使用的制冷剂和制冷负荷，增加基于微处理器的电子控制系统的成本在500美元到1500美元之间是可以接受的。在78000至160000 Btu/hr（22）的制冷负荷范围内，对不等并联压缩机系统进行了测试。 86至46.88千瓦）。对于制冷剂R-12，与机械压力控制系统相比，基于微处理器的电子控制系统的能效比（EER）增加了9.8%至14.4%。引用:研讨会，ASHRAE交易，第88卷，第2部分，加拿大多伦多

The Supermarket Refrigeration Systems Project was structured to investigate and develop new highly energy-efficient supermarket refrigeration systems. A supermarket refrigeration system that included unequal parallel compressors, a condenser with floating head-pressure control, and a microprocessor-based electronic control system was analyzed, designed, and tested. The total system capacity is 35 hp (26.10 kW), consisting of three compressors of 5, 10, and 20 hp (3.73, 7.46, and 14. 91 kW), which were determined to be the optimum number and capacity distribution. A theoretical comparison to conventional supermarket refrigeration systems revealed that the three unequal parallel compressor system with R-12 exhibited a maximum annual energy savings of 29,100 kWh, or 26%, and with R-502 exhibited a maximum annual energy savings of 20,100 kWh, or 15%.A compressor capacity control algorithm was designed to select the optimum compressor combination for each operating condition by matching compressor capacity to refrigeration load. A microprocessor system was selected for system control and data acquisition. The economic analysis revealed that for a payback period of three years or less, an added microprocessor-based electronic control system that costs between $500 and $1500, depending on the refrigerant used and the refrigeration load, is acceptable.Testing was performed on the unequal parallel compressor system over a refrigeration load range of 78,000 to 160,000 Btu/hr (22.86 to 46.88 kW). For refrigerant R-12, the increase in the energy efficiency ratio (EER) for the microprocessor-based electronic control system, as compared to the mechanical pressure control system, ranged from 9.8 to 14.4%.