Does anyone know exactly how this works? According to the building permit / planning permission, we have a total nominal capacity of 10 kW, but since our architect is extremely incompetent and I have only planned for a 6 kW heating system so far, I would like to know your experiences with the heating capacity for a detached small (120 sqm (1,292 sq ft)) single-family house? We want to heat with geothermal energy and are building at least to the KfW 70 standard. The capacity is now crucial for the borehole depth.
This chart also shows that since 2002, for 100 sqm (1,076 sq ft), 5 kW is assumed.
This chart also shows that since 2002, for 100 sqm (1,076 sq ft), 5 kW is assumed.
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ErikErdgas3 Jan 2016 12:40Hello,
the energy performance certificate is a good initial estimate for the required capacity. The energy performance certificate was most likely prepared by a specialist planner, not by the architect. I would suggest starting there and asking the architect to arrange a joint appointment with this specialist. It is possible that the energy performance certificate was simply calculated based on a “standard” without involving you as users. Currently, however, this can still be updated, and a heat load calculation as described by BeHaElja can be performed. General assumptions are very difficult because user behavior, location, building structure, and the building physics package all play a role. In principle, the specialist planner should run through several scenarios to select the appropriate building physics package and the suitable energy source (air-to-water heat pump, ground source heat pump, gas condensing boiler, combined heat and power unit, etc.) while considering legal requirements and your preferences!
Best regards, Erik
the energy performance certificate is a good initial estimate for the required capacity. The energy performance certificate was most likely prepared by a specialist planner, not by the architect. I would suggest starting there and asking the architect to arrange a joint appointment with this specialist. It is possible that the energy performance certificate was simply calculated based on a “standard” without involving you as users. Currently, however, this can still be updated, and a heat load calculation as described by BeHaElja can be performed. General assumptions are very difficult because user behavior, location, building structure, and the building physics package all play a role. In principle, the specialist planner should run through several scenarios to select the appropriate building physics package and the suitable energy source (air-to-water heat pump, ground source heat pump, gas condensing boiler, combined heat and power unit, etc.) while considering legal requirements and your preferences!
Best regards, Erik
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