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Ethyl alcohol based secondary heat transfer fluids are typically used in ground source heat pumps (GSHPs) in Sweden because of their attractive thermophysical properties and low toxicity. Denaturing agents must be added to ethyl alcohol based secondary fluids, and in Europe, the most commonly used are: propyl alcohol, n-butyl alcohol, methyl ethyl ketone, and methyl isobutyl ketone. In Sweden, only propyl alcohol and n-butyl alcohol can be used because of ...
Methyl and ethyl alcohol have good thermophysical characteristics for use in refrigeration systems. The purpose of this study was to measure the thermal conductivity of ethyl and methyl alcohol solutions to determine if they can become competitive secondary fluids. A Thermal Constants Analyzer measured the thermal conductivity of various 20-wt% ethyl alcohol and 20 wt-% propyl alcohol solutions using the Transient Plane Source (TPS) method. Measurements were taken after 1, 2, and 3 seconds ...
Borehole heat exchangers are used in conjunction with ground source heat pumps in Nordic countries. Aqueous ethanol solutions are commonly used with other secondary fluids such as water in borehole heat exchangers to decrease the freezing point of the liquid. However, ethanol based mediums contain denaturing agents that can affect the thermal properties of the secondary fluids. In this study, a Thermal Constants Analyzer used the Transient Plane Source method ...
