One of the most recent search terms on my blog was: ‘cistern for water source heat pump’. I wanted to double-check and searched for this phrase myself - and found an interesting and surprisingly old research report.
Engineering students from Iowa built a working prototype which resembles ours but they did not use a solar collector ... based on a very rough estimate of the heat transfer from ground to the cistern. They haven't tested their system for a whole season and I am pretty sure it could not have sustained heating in winter.
But most intriguing for me was that so far I had figured that 'ice storage' / 'cistern' / 'water tank' powered heat pump systems are a recent European trend - I was not able to find anything in English that wasn't a translation of German papers.
Now these guys from Iowa had been quite leading edge - but due to whatever reason their research had finally not been turned into many deployments or a product. Or it had never been published - I am happy to hear from heat owners in Iowa.
#heatpump #cistern #latentheat #iowa
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