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Advanced control of condensing temperature for enhancing the operating efficiency of air-cooled chillers

机译：先进的冷凝温度控制，可提高风冷式冷水机组的运行效率

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Air-cooled chillers are commonly used to provide cooling energy in commercial buildings in the subtropical climate. These chillers have long been considered inefficient because they operate under head pressure control where the condensing temperature is kept high in the refrigeration cycle. This paper considers a novel method to strategically lower the condensing temperature to enhance chiller efficiency at any outdoor temperature. An experiment is carried out on an air-cooled reciprocating chiller to confirm that an electronic expansion valve enables refrigerant to be adequately fed into the evaporator in all operating conditions, even when the condensing temperature falls to around 20℃. By enhancing the heat rejection airflow of the condenser, both the condensing temperature and chiller power can decrease considerably with less fluctuation. According to the algorithm of staging condenser fans, this enhancement corresponds to resetting the set point of the condensing temperature based on any outdoor temperature. The potential and benefits of implementing this reset strategy are discussed.
机译：在亚热带气候中，风冷式冷水机组通常用于在商业建筑中提供冷却能量。这些冷水机长期以来被认为是低效的，因为它们在压头压力控制下运行，在此压力下，制冷循环中的冷凝温度保持较高。本文考虑了一种策略性地降低冷凝温度以提高任何室外温度下的制冷机效率的新颖方法。在风冷往复式制冷机上进行了一项实验，以确认即使在冷凝温度降至20℃左右时，电子膨胀阀也能使制冷剂在所有运行条件下均能充分地进入蒸发器。通过增强冷凝器的散热气流，冷凝温度和冷却器功率都可以以较小的波动显着降低。根据分段式冷凝器风扇的算法，此增强功能对应于根据任何室外温度重置冷凝温度的设定点。讨论了实施此重置策略的潜力和好处。

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