延长双级耦合热泵一级侧机组启停周期的测试研究
Field test for solving frequent start-up of the first stage in double-stage coupled heat pumps
摘要：
比较了两种回归温差下一级侧机组的启停周期、系统供暖特性等。现场测试结果显示，加大回归温差，可以使一级侧机组小时启停频率降低至3 h-1以内，而系统能效比仍保持较高。分析了加大回归温差对末端环路水温的影响。讨论了最大回归温差的确定方法。
关键词：双级耦合热泵,中间水环路,一级侧机组,回归温差
Abstract：
Compares the start-up period and the heating characteristics of the first stage machines under two regress temperature difference. The field test results show that the first stage machines operating with large regress temperature difference will lower the start-up frequency to three times per hour and keep up higher energy efficiency. Analyses the effect of the enlarging regress temperature difference on the water temperature of terminal loop. Discusses the method for determining the maximal regress temperature difference.
Keywords:double-stage coupled heat pump, middle water loop, first stage machine, regress temperature difference