For the reasons of nature conservation great attention is paid at the systems that use low-grade heat sources in their work (that is heat energy of soils, air, discharge and drain).
原因自然保护的关注在系统使用低品位热源的工作(热能的土壤、空气、放电和排水)。
Meanwhile, only limited number of research papers [7-10] try to examine combined work of heat consumption in buildings control systems and heat pumps (low grade heat sources).
同时，只有有限数量的研究论文[7 - 10]试图研究相结合的建筑耗热量控制系统和热泵（低品位热源）。
This article compares control systems of heat consumption in buildings using conventional heat sources and those using low grade heat sources.
本文比较了在建筑控制系统热消耗使用常规热源和那些使用低品位热源。
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