What about a tank that is inserted in the hot water loop in order to increase the thermal inertia (heat pumps are controlled on the basis of a temperature and if the thermal inertia increases the frequency of the on/off cycles decreases)? Shall I consider the heat losses through the envelope of the tank? Only in the proposed or also in the baseline model?

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Mon, 04/23/2018 - 15:53

The tank insulation should be modeled as designed. I don't think any of the baseline systems would include such a tank so it is not an issue in the baseline.

Jean Marais

b.i.g. Bechtold DesignBuilder Expert

LEEDuser Basic Member

581 thumbs up

Tue, 04/24/2018 - 05:42

It's never the less an interesting question as you could consider the hydronic buffer part of the distrubution. Like why would you consider the one and not the other...For a small residential building the losses of the buffer would be larger in relation to line losses where as on a large project the line losses would be far more than that of the buffer. As the code is written at the moment, I would agree with Marcus. In fact, if that clause about the line loses was not there explicitly excluding them, you would model this 'equipment' as designed as well.

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