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Old 07-04-17, 05:10 PM   #524
tinco
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Join Date: Jan 2016
Location: The Netherlands
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Wow that's very impressive Kostas, those valves are exactly what I was worrying about, I will take some time to figure out everything you did.

I have a question about the heat exchangers, here people are talking about 20dT efficiency. To qualify for the subsidy my heat exchanger needs to be at least 90% efficient, it is not said at what thermal difference that efficiency should hold, but the commercial ones all list a single efficiency as conforming to the EPN (Energy Performance Directive) norm.

Does anyone have an idea how this norm might be established? It seems all commercial exchangers perform well in excess of 90% (some even 95%) even though 20dT is not very common at all (in The Netherlands I think the average would be closer to 10dT).
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