| From looking at your parameters, I’m guessing that this doesn’t represent a real heat exchanger that you’re trying to match as you specify a horizontal tube bank and then only have one tube - and it’s 30 meters long. So unless your tank is 30 meters long this probably isn’t right. So you’d like more heat transfer - so that means either more HX surface area or lower heat transfer resistance (or a bigger temperature difference but it sounds like you’re comfortable with those conditions). The pipes are copper and the Nusselt number parameters are pretty good (could go higher on the multiplier (maybe up to 1) and slightly higher on the exponent (maybe up to 0.3)) so your best bet is to add more tubes, make the tubes bigger, etc. Like many questions asked here, the answer is usually along the line of “What would you do in real life to fix it”. Always start there as almost all TRNSYS models are based on the physics of the real equipment. Jeff Sent from my iPhone On Jun 4, 2022, at 8:41 AM, Song Aoye via TRNSYS-users <trnsys-users@lists.onebuilding.org> wrote:
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