Experiences with the Refrigerant R134a as a "Drop-In" Replacement in a Large Water-Water-Heat Pump
نویسندگان
چکیده
A considerable amount of large scale heat pumps working mainly with Rl2 but also partially with Rll4 has been installed in Germany in the past. -As considerable investments have been made, a conversion from Rl2 to Rl34a seems to be an important task. Due to this reason a research project has been started at the University of Hannover to evaluate the possibility of such a conversion. To achieve the design heat·capacity, to reach nearly the same COP and to guarantee a good material compatibility are the most important requirements. This work presents firstexperiences with the refrigerant Rl34a as "Drop-In" in a water-water-heat pump with a heat capacity of design so kW. In this plant the refriger~nt Rl2· as well as a mineral oil as lubricant have been replaced by the refrigerant Rl34a and an ester oil as the new lubricant. An energetic comparison of the plant operating with Rl2 and Rl34a will be presented as well as an examination of the stability of refrigerant/oil under "Drop-In" conditions.
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