ᐅ Trench Collector Ground Source Heat Pump or Air Source Heat Pump?
Created on: 1 Mar 2015 10:25
L
Legurit
Hello everyone,
We had our first meeting with the builder yesterday. He quickly dismissed the heating topic since there is no gas connection but gave us some contact addresses.
The house has roughly 190 m² (2,045 sq ft) of living space and a heating demand of 6,600 kWh/year, or about 6 kW heating load.
So far, we have planned to install a ground-source heat pump with a horizontal collector, but the builder rightly pointed out that he would prefer some maneuvering space around the house. In the pink forum, there is a community advocating for DIY horizontal collectors, saying that the trenches including materials could be done for around €2,000. Including the heat pump gross price of €10,000, that would be €12,000 total. An air-source heat pump would cost at least that much for the unit alone.
Unfortunately, we are already a bit overwhelmed with the house planning and are not sure if we would trust ourselves to do the DIY installation. Does anyone have experience with the costs when contracting out the trenching and pipe laying?
As for consumption, we found a factor of about 1.5. So the air-source heat pump would be around 50% more expensive to operate than the ground-source heat pump, but we wouldn’t have to dig (in absolute terms, about €180 per year). We are also unsure whether having a photovoltaic system would be beneficial or not (we are skeptical).
Thanks for your experiences and advice.
We had our first meeting with the builder yesterday. He quickly dismissed the heating topic since there is no gas connection but gave us some contact addresses.
The house has roughly 190 m² (2,045 sq ft) of living space and a heating demand of 6,600 kWh/year, or about 6 kW heating load.
So far, we have planned to install a ground-source heat pump with a horizontal collector, but the builder rightly pointed out that he would prefer some maneuvering space around the house. In the pink forum, there is a community advocating for DIY horizontal collectors, saying that the trenches including materials could be done for around €2,000. Including the heat pump gross price of €10,000, that would be €12,000 total. An air-source heat pump would cost at least that much for the unit alone.
Unfortunately, we are already a bit overwhelmed with the house planning and are not sure if we would trust ourselves to do the DIY installation. Does anyone have experience with the costs when contracting out the trenching and pipe laying?
As for consumption, we found a factor of about 1.5. So the air-source heat pump would be around 50% more expensive to operate than the ground-source heat pump, but we wouldn’t have to dig (in absolute terms, about €180 per year). We are also unsure whether having a photovoltaic system would be beneficial or not (we are skeptical).
Thanks for your experiences and advice.
Sebastian79 schrieb:
Oh, and when heating the screed, I had a seasonal performance factor of 1.9 You’re confusing COP and seasonal performance factor. Or did you actually heat screed for a whole year ;p.
My brine heat pump has a COP of about 4.8 at B0W35 but in reality a significantly higher seasonal performance factor. For air-to-air heat pumps, the seasonal performance factor is usually lower than the stated COP.
S
Sebastian793 Jun 2016 18:19No, I haven’t mixed anything up.
Sebastian79 schrieb:
No, I didn’t confuse anything. Sure. Look up what the annual performance factor means, and how you can have an annual performance factor with screed heating.
S
Sebastian793 Jun 2016 18:46Kehr, just take a look at what COP means – are you suggesting that the coefficient of performance, which is usually described with the annual performance factor, can only be displayed once a year?
Otherwise, feel free to call it MAZ, then it will be correct for you.
Otherwise, feel free to call it MAZ, then it will be correct for you.
Sebastian79 schrieb:
Kehr, take a look at what COP means – are you suggesting that the coefficient of performance, which is described as the seasonal performance factor, can only be shown once per year?
Feel free to call it SPF instead, then it would be correct for you. I know what both terms mean. The seasonal performance factor (SPF) is the average over one year, while COP is an instantaneous coefficient of performance, which is given under specific operating conditions.
Therefore, the SPF can only be indicated on an annual basis; it is meant to compare the actual performance of a heat pump under the various operating conditions encountered throughout the year. What you said is similar to saying, "the annual average temperature was 14°C (57°F) in May." Much higher than previous annual averages...
So just calm down, this is not a competition about who is most right. But if you yourself post as above and point out that someone confuses COP and SPF, you should get it right yourself and set a good example. Anyone can complain. Just take a look at your posts #41 and #43 here...
Similar topics