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Then where does the heat from your dehumidifier go? MVHR seems to assume outside air is always cooler and fresher than inside air, and uses that for free cooli
by maxsilver 9y ago
Then where does the heat from your dehumidifier go?
MVHR seems to assume outside air is always cooler and fresher than inside air, and uses that for free cooling. Which is great for like 70% of the time. But what about the ~30% of time when it isn't there.
- dangravell 9y agoIt doesn't assume that. MVHR has a bypass to disable the heat exchanger if that's important. You don't have a dehumidifier. One of the biggest benefits of fabric first is the reduction in complexity.
- falcolas 9y agoIf you don't have a dehumidifier, all of those big bags of mostly water that inhabit the building will expel some of that water with every breath, and going to increase the humidity fairly noticeably. I'm also going to guess that the MVHR is also not 100% efficient. It's either going to create heat to completely cool down the incoming air (hey, look, an AC, complete with dehumidification), or the incoming air is going to average out with the out going air, creating an increase in temperature. Plus, all of those bags of mostly water are going to be expelling heat, too.
- willyt 9y agoMVHR dehumidifies the air inside, I explained in another comment above. We have used units which are 96% efficient.
- dangravell 9y agoMVHR is a ventilation system - it removes the humidity. A decent MVHR runs at double figures in terms of watts, so like an old fashioned light bulb.
- wheresmyusern 9y agowhat are you talking about? who mentioned a dehumidifier? mvhr simply exchanges air without changing its temperature. its not great for cooling or heating by its very definition. its good for humidity and freshness. using insulation and hr ventilation simply allows you to have a heating and air conditioning solution that is massively reduced in size. in some cases none at all.