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NC-2009 EAp2:Minimum Energy Performance

Heat recovery and dehumidification

In a swimming pool removing latent heat is necessary all the year round. For the baseline model, if I model the heat recovery according to G3.1.2.10 Exhaust Air Energy Recovery (50% both sensible and latent efficiency), the humidity ratio of the supplied air is increased by the latent heat recovery (particularly in winter). As an effect, the dehumidification system has to work more. Shall (can) I model the heat recovery anyway? Not clear if exception g. applies. In the proposed/design model there is sensible only recovery and dehumidification. Best Regards

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 08/08/2017 - 13:53

I think the conditioning of natatoriums is a bit of a grey area. The pool heating itself is clearly a process load. The space conditioning required is primarily due to that process load but is done for the occupants (and to maintain the structure of the building). If adding heat recovery increases the overall energy use I would not include it. Doing so is the conservative approach which is always the choice to make when in doubt.

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