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5 votes
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What makes swimming pool heat pumps unsuited for home use?

There are a few factors here: Temperature range. Domestic heating water ranges from about 90 F (35 C) to 140 F (60C) The latter is used in radiators and fan coil heat exchangers, the former used in ...
Sherwood Botsford's user avatar
4 votes

Optimal aspect to position air source heat pump (south/east/west)?

I thought to expand a bit on user the answer provided by lshaver above. The following discussion concerns the use of an air heat pump though the discussion of some of the mechanics also applies to a ...
Richard Chambers's user avatar
4 votes

Can a compact compost heat recovery system reduce the usage of fossil fuels on household heating?

Reduce yes. Reduce markedly, no, unless you live in a passive house. A normal human eats about 12 megajoules per day. If waste food is at such a high level as 3 megajoules per day (most people on this ...
juhist's user avatar
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3 votes
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Is it inefficient to turn off the airconditioner for short durations of less than two hours?

I was recently recommended not to turn off the airconditioner (A/C) when leaving a room for two hours or less but instead to increase the temperature setting closer to the outside temperature. ...
juhist's user avatar
  • 5,099
3 votes

Can a compact compost heat recovery system reduce the usage of fossil fuels on household heating?

My answer is yes if this system is run at the size of a town/city and it could run as a rental service. A medium-sized facility will be the center of this operation. First it collect organic wastes ...
gitpharm01's user avatar
3 votes
Accepted

What is the actual efficiency of an air to air heat pump in the winter

There's a bit of data in a paper titled A Review of Domestic Heat Pump Coefficient of Performance (by Dr Iain Staffell, Imperial College London, Centre for Environmental Policy, 2009-04) that you ...
Tim's user avatar
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3 votes

Temperature equalisation throughout the house

The story so far There are three different things that can cause an upstairs to be hotter than a downstairs, and you've mentioned each briefly in your question and comments: Convection. Hot air rises ...
LShaver's user avatar
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3 votes
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heat pump ecodan noise: constant or variable

I have since spoken with somebody who owns an Ecodan and they confirm it's either on or off, with no intermediate levels in normal operation, though I didn't discover whether defrost cycles differ to ...
Sideshow Bob's user avatar
2 votes
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Optimal aspect to position air source heat pump (south/east/west)?

Nu-heat's advice: Bear in mind that your heat pump will need to work harder if it is situated in a cooler, north-facing, shady position, than if it is located in a southern-facing, sunny spot. ...
LShaver's user avatar
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2 votes

What makes swimming pool heat pumps unsuited for home use?

I reached out to a manufacturer of swimming pool heat pumps, and it turns out that they go up to 40C or so. So it seems that the difference is the maximum temperature they can reach, and presumably ...
w00t's user avatar
  • 401
2 votes
Accepted

How more efficient are low surface temperature radiators than traditional boiler systems?

The key is this part, from page two of the brochure: The ULOW-E2 provides enhanced convection via in-built fans. This enables heat sources to operate at their most energy efficient settings. The "...
LShaver's user avatar
  • 11.9k
2 votes

Temperature equalisation throughout the house

Enclosing the stairwell would be a big help with the heating if it can be done with your floorplan.
Derek Andrews's user avatar
2 votes
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For dehumidification purposes, does a ductless heat pump use more or less energy than a dehumidifier?

All else being equal, the dehumidifier will be more efficient. Both devices utilize the same refrigeration cycle (from Wikipedia): Both devices remove moisture from the air at the evaporator (3), ...
LShaver's user avatar
  • 11.9k
1 vote

Will supplemental heating source shut down my heat pump?

It depends where the temperature sensor(s)/thermostats are and where the heat sources are. Imagine a single-room setup - using a heater means the heat pump will not work as hard or as often because ...
Móż's user avatar
  • 3,935
1 vote

Can a compact compost heat recovery system reduce the usage of fossil fuels on household heating?

A few thoughts: if you take too much heat from the compost, the lower temperature impacts the rotting processes. In the end, the same amount of energy will be released, but the thermal power will be ...
cbeleites unhappy with SX's user avatar
1 vote

Why are heat pumps said to be more expensive than AC?

This is slightly speculative, but I came across a sensible answer. In an electric car, the cooling system cools the cabin but also cools the battery. In some conditions, the passenger may request ...
Eric G's user avatar
  • 141
1 vote

Air source heat pumps: does prevailing wind matter?

TL;DR: There is conflicting information on this, and a lot of variables at play -- most likely you will need to speak to the manufacturers or installers of the units you are considering to determine ...
LShaver's user avatar
  • 11.9k
1 vote

What is the actual efficiency of an air to air heat pump in the winter

There are standards for the declared Coefficient of Performance (COP) in Europe and Canada. In Europe this is in DELEGATED REGULATION (EU) No 626/2011 (there is a more accessible discussion in ...
M Juckes's user avatar
  • 1,021
1 vote

Temperature equalisation throughout the house

Issue 1: Cold floor downstairs: Installing a few ceiling fans that kept the air near the floor moving would help a lot. Place area rugs where people's feet park helps a lot too. If the slab is ...
Sherwood Botsford's user avatar
1 vote

Temperature equalisation throughout the house

You seem to be having issues with convection taking warm air upstairs, especially if you have extractors or vents taking air from upstairs bathrooms to the outside world. I have similar issues ...
Chris H's user avatar
  • 2,126

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