I do have a question about the section at the start where it was explained that it was the differential between the source and output temperatures that affected the efficiency. In the manual for my Vaillant heat pump it does not show this relationship, it does show the efficiency decreasing with increasing output temperature but not affected by source temperature. So as an example, my Vaillant Arotherm+ has the following figures for a flow temperature of 50º. SCOP 3.41 for all the specified outside temperatures. The maximum power output however varied according to air temperature, with -5º=5.5kW, -3º=5.9kW, 0º=6.4kW, 2º=6.7kW, this indicates that at lower temperatures the maximum power will drop, but efficiency will remain. I assumed that source temperature was external air temperature, It may be that by source temperature it was meant the input water temperature from the heating system rather than outside temperature, in which case my question is invalid, it did seem though in the video that source temperature was outside air temperature.
I should add to my post that the COP readings I get from my heat pump reflect the manual. It's not possible to tell from the heating because the weather compensation means that when the weather is colder the water flow temperature goes up (obviously), however the hot water is always roughly the same flow temperature - some variation depending upon how much hot water I've used. For my hot water I find I get a cop of 3.1/3.2 whatever the outside temperature, if I run the cycle during the day with 15º outside then the COP is roughly the same as when the temperature is 7º - the heat pump has only been in a few months, so I've not had any really low temps.
I always find it funny that you in the UK thinks -10C to be extreme temperature. Also nice to see a fellow Swede in the discussion. And he immediately adjusted that scale. 😀
The problem I see with hybrids (gas backup) is that there is still a reliance on the gas network, really we want to be closing down the gas network not putting out the message that "they're OK, but we need gas for when things get difficult". I realize that there is a transition period, but putting in new systems that rely on gas doesn't seem right. Of course if the backup was just to supplement with electric immersion heating then that would not be a problem, though as was pointed out in the video by Carlos choosing the right heat pump is possible.
Would it not be possible to apply low temp heating theory to conventional combi-boilers? I appreciate there’s many considerations and variables and that it comes down to primarily how well insulated a property is, but would it be more cost effective to run modern combi-boilers at say lowest point of condensing range around 60degrees but for longer durations of time. I have both: heat pump and a combi on properties I own. I was thinking whether it’s possible to apply similar school of thought to the gas boiler side of things? Thx
Is humidity being high in UK and Ireland not a big factor when temperature gets low defrosting is more because of the humidity Evaporator freezing up more.
-10 °C extreme cold? 😂 Works fine down to -25 °C, where the SCOP is 1,0 (or probably below 1,0 as heating element is at 100%). You should not switch off during winter in order to avoid freezing of the exhanger.
I got a Grant heat pump on a Grant the installers went bust immediately,so out the equation they didn’t want to know.I have a black box on the wall which must be recording something but what no instructions the guy that came to service the pump hadn’t a clue all he had was a screwdriver same guy that installed it they just wound the company up didn’t care then don’t care now no one to reprimand them untouchable.Just throwing good money after bad Heat Loss it is all fitted Pump.Pipework if you know what I mean.Like your channel but they keep rabbiting on about why it’s not working my Combi Worked perfectly idiot proof to hot turn it down to cold turn it up.Job done.Same house same draughty rooms same pipework ?
I do have a question about the section at the start where it was explained that it was the differential between the source and output temperatures that affected the efficiency.
In the manual for my Vaillant heat pump it does not show this relationship, it does show the efficiency decreasing with increasing output temperature but not affected by source temperature.
So as an example, my Vaillant Arotherm+ has the following figures for a flow temperature of 50º. SCOP 3.41 for all the specified outside temperatures. The maximum power output however varied according to air temperature, with -5º=5.5kW, -3º=5.9kW, 0º=6.4kW, 2º=6.7kW, this indicates that at lower temperatures the maximum power will drop, but efficiency will remain.
I assumed that source temperature was external air temperature, It may be that by source temperature it was meant the input water temperature from the heating system rather than outside temperature, in which case my question is invalid, it did seem though in the video that source temperature was outside air temperature.
I should add to my post that the COP readings I get from my heat pump reflect the manual. It's not possible to tell from the heating because the weather compensation means that when the weather is colder the water flow temperature goes up (obviously), however the hot water is always roughly the same flow temperature - some variation depending upon how much hot water I've used.
For my hot water I find I get a cop of 3.1/3.2 whatever the outside temperature, if I run the cycle during the day with 15º outside then the COP is roughly the same as when the temperature is 7º - the heat pump has only been in a few months, so I've not had any really low temps.
I always find it funny that you in the UK thinks -10C to be extreme temperature.
Also nice to see a fellow Swede in the discussion. And he immediately adjusted that scale. 😀
The problem I see with hybrids (gas backup) is that there is still a reliance on the gas network, really we want to be closing down the gas network not putting out the message that "they're OK, but we need gas for when things get difficult".
I realize that there is a transition period, but putting in new systems that rely on gas doesn't seem right. Of course if the backup was just to supplement with electric immersion heating then that would not be a problem, though as was pointed out in the video by Carlos choosing the right heat pump is possible.
Would it not be possible to apply low temp heating theory to conventional combi-boilers? I appreciate there’s many considerations and variables and that it comes down to primarily how well insulated a property is, but would it be more cost effective to run modern combi-boilers at say lowest point of condensing range around 60degrees but for longer durations of time. I have both: heat pump and a combi on properties I own. I was thinking whether it’s possible to apply similar school of thought to the gas boiler side of things? Thx
Is humidity being high in UK and Ireland not a big factor when temperature gets low defrosting is more because of the humidity Evaporator freezing up more.
Yes it is. Temperatures between 2-4C typically lead to more defrost cycles.
I'm having difficulty controlling THE VOLUME OF MY VOICE 😂
There were a few volume and sound issues. We tried to level things out as much as we could, but we are reliant on guest's equipment.
@@RenewableHeatingHub yeah I guessed as much, just had me chuckling as I remembered Austin Powers
-10 °C extreme cold? 😂
Works fine down to -25 °C, where the SCOP is 1,0 (or probably below 1,0 as heating element is at 100%). You should not switch off during winter in order to avoid freezing of the exhanger.
I got a Grant heat pump on a Grant the installers went bust immediately,so out the equation they didn’t want to know.I have a black box on the wall which must be recording something but what no instructions the guy that came to service the pump hadn’t a clue all he had was a screwdriver same guy that installed it they just wound the company up didn’t care then don’t care now no one to reprimand them untouchable.Just throwing good money after bad Heat Loss it is all fitted Pump.Pipework if you know what I mean.Like your channel but they keep rabbiting on about why it’s not working my Combi Worked perfectly idiot proof to hot turn it down to cold turn it up.Job done.Same house same draughty rooms same pipework ?