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Post by dickpuller on Nov 5, 2022 18:28:32 GMT
John’s explanation makes it amazingly simple to understand the concept & function of a Heat Pump. Anyone involved in Central Heating should watch his design videos, they too are exceptional!!
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Post by tomplum on Nov 5, 2022 22:22:52 GMT
My lad who lives in Canada had one fitted 2 years ago and, Its a game changer, uses next to nothing in electric and heats his house to 20 degrees inside when the outside temp is -20 degrees, he still has a log burner for when it gets below -20, which it does from time to time, it can get -30 or 35 and the heat pump can't cope so the log burner is a back up,  |
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Post by crowsfoot on Nov 6, 2022 9:16:54 GMT
After maintaining the plumbing side of heat pumps for about 17 years I have to say that for me the jury in the UK is still out on them.
The last labour government had commissioned a report on them asking why they don't seem to be working in the UK?
Sadly, the report was cancelled by the incoming conservative government as part of the austerity measures that were needed to balance the UKs books.
It would have made very interesting reading me-thinks.
My final thinking on them after 17 years of working with them is "if you can afford to heat your home to the governments recommended temperatures using standard heating methods then you will save some money by using a heat pump".
However, if you cannot afford/willing to spend the money to do this then they are a waste of money.
When asked how they work I always say that the technology behind the heat pump is off the planet.
You need a compressor in order to alter the air pressure around a liquid thus putting the said liquid into a vacuum which causes the liquid to boil at a very low temperature thus turning it into a gas (which can then be compressed and in doing so will give up its heat).
The gas gets cooler and slowly returns to its normal liquid on planet earth state before it travels back into the vacuum of outer space (via the compressor) and the process starts all over again.
You have to wonder who the hell thought all this up?
I've still got some info on heat pumps that I could scan and post up if anyone's interested.
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Post by battle1066 on Nov 6, 2022 17:15:04 GMT
After maintaining the plumbing side of heat pumps for about 17 years I have to say that for me the jury in the UK is still out on them. The last labour government had commissioned a report on them asking why they don't seem to be working in the UK? Sadly, the report was cancelled by the incoming conservative government as part of the austerity measures that were needed to balance the UKs books. It would have made very interesting reading me-thinks. My final thinking on them after 17 years of working with them is "if you can afford to heat your home to the governments recommended temperatures using standard heating methods then you will save some money by using a heat pump". However, if you cannot afford/willing to spend the money to do this then they are a waste of money. When asked how they work I always say that the technology behind the heat pump is off the planet. You need a compressor in order to alter the air pressure around a liquid thus putting the said liquid into a vacuum which causes the liquid to boil at a very low temperature thus turning it into a gas (which can then be compressed and in doing so will give up its heat). The gas gets cooler and slowly returns to its normal liquid on planet earth state before it travels back into the vacuum of outer space (via the compressor) and the process starts all over again. You have to wonder who the hell thought all this up? I've still got some info on heat pumps that I could scan and post up if anyone's interested. I’m always interested in being educated Tappy so please. |
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Post by battle1066 on Nov 6, 2022 17:18:23 GMT
My lad who lives in Canada had one fitted 2 years ago and, Its a game changer, uses next to nothing in electric and heats his house to 20 degrees inside when the outside temp is -20 degrees, he still has a log burner for when it gets below -20, which it does from time to time, it can get -30 or 35 and the heat pump can't cope so the log burner is a back up, I’m curious as to the noise level of the fan during the night for keeping you awake. |
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Post by dickpuller on Nov 6, 2022 20:02:05 GMT
After installing Vaillant & Daikin Heat Pumps on New Builds, I think they’re great. Most systems are Hybrid with a gas boiler.
So simply, when there a high demand, the boiler will kick in. Then the HP just ticks over to maintain heat in the home. However, these are well insulated houses & can be heated by a ‘low temperature’ system
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Post by crowsfoot on Nov 6, 2022 20:57:33 GMT
And that could well be the answer Dick All the ones that I worked on have all been installed in pre-existing houses using oversized radiators rather than UFH! The recommendation is for the heat pump to be set to switch on at 4:00am in order to get the hot water up to temperature so the heat pump can then fully concentrate on heating the property when the occupants arise (like most boilers heat pumps give priority to hot water). This gives rise to a lot of early morning noise which travels well in the early hours from the AS unit (plenty for the neighbours to complain about)   !! I've got quite a big folder on them battle, but I'll see what catches my eye in it then scan some of it (give me a few days). |
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Post by dickpuller on Nov 7, 2022 7:49:28 GMT
The ASHP hybrid systems on new builds manly have radiator emitters, no UFH.
What you must understand, heat pumps need to be on, cycling kills heat pumps. The modern ones can modulate the fan & compressor & manufacturers are moving to higher temperature units, with different Fridge Gasses.
You need well insulated houses for a HP to be efficient.
Most gas boilers in new builds are grossly oversized!!
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Post by crowsfoot on Nov 7, 2022 9:10:24 GMT
Interesting that new builds have gone with a hybrid system because it's not long before gas boilers are going to be outlawed in the UK altogether!
Heat pumps certainly need to be left on - even 24/7 in those zero minus cold spells that the UK seems to experience every 2 or 3 winters,
One of my questions about heat pumps was why fit a time clock on these units (if you fit one the occupiers will start dictating what times that they want it to switch on/off)?
Let the heat pump controls do the work I say.
John says in the video that humans are very bad judges of temperature.
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Post by dickpuller on Nov 7, 2022 10:35:18 GMT
Interesting that new builds have gone with a hybrid system because it's not long before gas boilers are going to be outlawed in the UK altogether! Heat pumps certainly need to be left on - even 24/7 in those zero minus cold spells that the UK seems to experience every 2 or 3 winters, One of my questions about heat pumps was why fit a time clock on these units (if you fit one the occupiers will start dictating what times that they want it to switch on/off)? Let the heat pump controls do the work I say. John says in the video that humans are very bad judges of temperature. Last point first, yes human are a very poor judge of temperature. You’ll never feel cold looking out a window at a sunny day, but always feel cold looking out on snow covered ground. Its all in the mind😏 With Low Temperature heating, be it a HP or Boiler, it’s on 24/7 - but you’d have a ‘night set-back’ temperature. So a Timer would just introduce compressor cycling, that leads to premature compressor failure. Latest news here in Jockoland, it’s 2035 before they stop fitting boilers in new builds. Anyone thinking about fitting a HP, fit a cheap investor Mini Split unit. Air to Air heating & cooling is the future👍👍 |
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Post by rocketmanbkk on Nov 7, 2022 12:38:40 GMT
How much is an instal on a 3 bed house?
South England
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Post by dickpuller on Nov 7, 2022 21:58:20 GMT
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Post by crowsfoot on Nov 8, 2022 8:29:15 GMT
I can't really comment on that combination of units Dick (it's out of my experience area).
Isn't air conditioning one of the big evils of climate change?
2035 to outlaw gas boilers, now that does seem a long way off.
However, I would have thought that the government would want to start the program much earlier than that on new builds.
Rocky, you can or at least could get a government grant to help reduce the cost of a conversion from fossil fuels to ASHP/GSHP unit.
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Post by dickpuller on Nov 8, 2022 19:20:12 GMT
I can't really comment on that combination of units Dick (it's out of my experience area). Isn't air conditioning one of the big evils of climate change? 2035 to outlaw gas boilers, now that does seem a long way off. However, I would have thought that the government would want to start the program much earlier than that on new builds. Rocky, you can or at least could get a government grant to help reduce the cost of a conversion from fossil fuels to ASHP/GSHP unit. These are Air 2 Air units CF. Millions sold worldwide, that’s why they’re so cheap. The biggest evil to climate change is the Tree Huggers!! See, it’s easy for the Tree Huggers to say ban this or that, because it uses Fossil Fuels, but actually banning gas boilers for example is very difficult. |
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Post by crowsfoot on Nov 8, 2022 20:03:07 GMT
 battle,today I had a look at the folder on heat pumps that I was given from the course I attended around 10 years ago.  it's quite boring stuff really, however, here are a couple of the more interesting bits from war and peace . |
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