john of wessex
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Extractor fan with Heat RecoveryI am lookiing at getting extractor fans fitted in the bathroom & shower room.
I asked the sparky about extraction with heat recovery units but he had never fitted one.
So, Mr Google came up with some stuff but I'm B******d if I can understand it.
Any suggestions anyone? The bathroom unit will be located in the attic so can be huge but the shower room is single skin brick.
Suggestions anyone??
Many thanks
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Mutton
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Um - not a lot of help for you this, but here is my pennyworth.
We looked at heat recovery ventilation system for the whole house, but were going to keep the bathroom on an ordinary extract fan for shower time because of all the moist air leaving.
So if you use the leaving moist bathroom air to heat incoming colder air, you will have to have some kind of drain for all the condensation that I assume will happen in the heat exchanger.
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RichardW
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I doubt the minimal heat in one room will make much difference. Its normally done as part of a whole house solution including super insulating & draft proofing the house first. You then "harvest" the heat from the hot areas to ventilate & passive heat the cooler ones.
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Shane
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As Richard says, the flow of air from a bathroom won't have enough heat in it to be of any use. In fact, at times when the air is saturated with water (i.e. whenever you have a shower) it will probably cool down any air stream than you put through the other side of an exchanger as the condensing water will take energy out of the metal in the unit as it evaporates.
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Hairyloon
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| Shane wrote: | | ...it will probably cool down any air stream than you put through the other side of an exchanger as the condensing water will take energy out of the metal in the unit as it evaporates. |
Just read that back to yourself.
Regarding what else folk said:
Yes you would need a drain, but it's a bathroom so that shouldn't be too big a stretch.
Yes, it is unlikely to be cost effective for one room. Does that mean you shouldn't do it?
If you are so minded, you could take the workings out of an old fridge and use that to build one.
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Shane
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| Hairyloon wrote: | | Shane wrote: | | ...it will probably cool down any air stream than you put through the other side of an exchanger as the condensing water will take energy out of the metal in the unit as it evaporates. |
Just read that back to yourself. |
Okay - to be clearer: water from a saturated air stream will condense on a metal surface and will then draw heat from that surface as it evaporates.
Make sense?
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ros
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more sense than the previous one  - though I assumed that's what you meant
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