I was looking over one of the key posts/marked threads on this great
forum recently and I noticed a post comparing the brine & DX
variants of collector/heat pump GSHP systems.
One statement caused me concern since I have already received
a quote from an indirect GSHP system which includes provision
of domestic hot water. The system includes horizontal collector
and a NIBE fighter 1220 heat pump (which has a storage tank
for hot water needs integrated within a single tall unit which
also houses the main heat pump).
Is the following an issue with non-DX systems or even a concern ?
I am quoting Moss from a contribution to an earlier thread:
"However, I have found that there are two types of heatpumps - direct evaporation (refrigerant) and indirect evaporation (water and antifreeze). The direct appears to be the most efficent giving a higher COP (coefficient of performance) or heat factor. I am told that it doesnt require a circulaton pump and avoids a heat exchanger - saving electricty. It brings water up to 90degrees C - (above legionaires disease - 60/70 degrees C) avoiding the need of an electric emersion and is cheaper to install using up less ground space requirement than indirect heat pump."
I was told that the indirect heat pump (NIBE) included a tank which
had a backup immersion element but that it was rarely required.
However, if the water is only brought to say 55 degrees is this
risky with respect to Legionnaire's disease. Also is it adequate temp
for a shower or bath ?
-ipxl
forum recently and I noticed a post comparing the brine & DX
variants of collector/heat pump GSHP systems.
One statement caused me concern since I have already received
a quote from an indirect GSHP system which includes provision
of domestic hot water. The system includes horizontal collector
and a NIBE fighter 1220 heat pump (which has a storage tank
for hot water needs integrated within a single tall unit which
also houses the main heat pump).
Is the following an issue with non-DX systems or even a concern ?
I am quoting Moss from a contribution to an earlier thread:
"However, I have found that there are two types of heatpumps - direct evaporation (refrigerant) and indirect evaporation (water and antifreeze). The direct appears to be the most efficent giving a higher COP (coefficient of performance) or heat factor. I am told that it doesnt require a circulaton pump and avoids a heat exchanger - saving electricty. It brings water up to 90degrees C - (above legionaires disease - 60/70 degrees C) avoiding the need of an electric emersion and is cheaper to install using up less ground space requirement than indirect heat pump."
I was told that the indirect heat pump (NIBE) included a tank which
had a backup immersion element but that it was rarely required.
However, if the water is only brought to say 55 degrees is this
risky with respect to Legionnaire's disease. Also is it adequate temp
for a shower or bath ?
-ipxl