Has anyone had any experience with installing a domestic hot water circulation loop to a domestic hot water cylinder being fed by a ground source heat pump?
The new house really needs to have a continuous HW loop as some draw offs are over 20m away from the plant room. As you all know, on a conventional system this would be fine as the HW cylinder would be over 60ºC and the circulation loop (which would typically be around 50ºC) can be easily achieved. However, with a ground source heat pump system the temperature of the cylinder would be maintained at around 45ºC, being raised to over 60ºC at pre-set times, once a week. But this would mean the HW temp would be circulating at perhaps 40ºC. The flow temp of the GSHP could be raised but this reduces the efficiency of the heat pump.
Does anyone see this lower temp as a problem, this must have been done before as GSHP's are installed on many large new build houses.
Cheers.
The new house really needs to have a continuous HW loop as some draw offs are over 20m away from the plant room. As you all know, on a conventional system this would be fine as the HW cylinder would be over 60ºC and the circulation loop (which would typically be around 50ºC) can be easily achieved. However, with a ground source heat pump system the temperature of the cylinder would be maintained at around 45ºC, being raised to over 60ºC at pre-set times, once a week. But this would mean the HW temp would be circulating at perhaps 40ºC. The flow temp of the GSHP could be raised but this reduces the efficiency of the heat pump.
Does anyone see this lower temp as a problem, this must have been done before as GSHP's are installed on many large new build houses.
Cheers.