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Author Topic: air to water heat pumps  (Read 2464 times)
solarod
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« on: August 11, 2006, 11:31:35 AM »

are air to water heat pumps worth considering as  opposed to ground heat pumps ,due to the easy of installation
regards
Rod
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Ian
installers
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« Reply #1 on: August 12, 2006, 08:11:47 AM »

solarod.

Air to water heat pumps are worth considering if you can satisfy the following conditions :

1. Plentiful supply of air (constantly moving)
2. Air never goes below, say, 5 degrees C (not a "magic figure - just one pulled out of the air for ball park understanding)
3. Air is never "wet" with frost, cloud, mist, etc.
4. Good supply of low cost electricity
5. You can site the unit where fan and compressor noise, vibration, etc. is not a problem

I hope this helps.

Regards,
Ian
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Ivan
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« Reply #2 on: August 13, 2006, 12:30:16 AM »

Air source heatpumps are a lot cheaper, and easier to install. Unfortunately, the COP tends to be significantly lower - considerably under 3,whereas GSHP are normally 4 or more. The reason for this, is that you tend to get condensation on the source coil which then freezes - and ice is a good insulator - so it causes the heatpump to work harder to extract heat from the air.
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