Did I lose you Mad, current dew point is 16.7c
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Did I lose you Mad, current dew point is 16.7c
Not lost, just missed the thread!
If the ground ground temp is below dew point of the ambient entering air then you will get some level of dehumidification.
True but I can't assume that especially with a few weeks of 30+ heat so other options should be available. I do know what local commercial options are for de-humidification but Europe tends to be where most new products come from, with the exception of the HRV which was developed here in the 70s.
I am trying to get a handle on the state of the art.
We rarely need dehumidification here in Belgium so the problem doesn't arise. I even think it isn't allowed either. You have simple heat recovery units but those used for example by Mitsubishi are enthalpy recovery units, they interchange also moisture and can humidify or dry partially.
We have very different weather patterns here. While the temps here are record breaking at 34-40C it is the humidity levels that can approach 85% on a sunny day that causes discomfort and therefor much of our energy goes in removing the moisture. Of course without cooling the temp is really uncomfortable.
The code requirements here are for HRV's in all new houses and in major whole house renovations and we have been using ERVs (desiccant wheels) for at least 15 years+. Personally I would rather see people open windows once in a while than have mechanical ventilation mandated by code( I don't like the excess energy use). Here you must provide a certain amount of air to each room and exhaust as well. It is not enough to dump bulk air into a house so ducting is necessary.
here is a video of one product over here
http://www.venmar.ca/en/video_eng.aspx