Hello everyone,
we are building a KfW 40 house with a Viessmann Vitocal 200-S heat pump and an 8 kW photovoltaic system.
The heat pump is also capable of cooling. The upgrade would cost 1000 € (only the heating installer, thermostats extra).
Is it generally worthwhile to cool using the heat pump? Just because it can does not necessarily mean it is practical.
How fast does a room cool down? Underfloor heating systems are usually quite slow in response.
Or does it make more sense to invest in an air conditioning system and operate it with the photovoltaic system on hot days?
Thanks and best regards
Markus254
we are building a KfW 40 house with a Viessmann Vitocal 200-S heat pump and an 8 kW photovoltaic system.
The heat pump is also capable of cooling. The upgrade would cost 1000 € (only the heating installer, thermostats extra).
Is it generally worthwhile to cool using the heat pump? Just because it can does not necessarily mean it is practical.
How fast does a room cool down? Underfloor heating systems are usually quite slow in response.
Or does it make more sense to invest in an air conditioning system and operate it with the photovoltaic system on hot days?
Thanks and best regards
Markus254
So.. update from us. We received the quote for the cooling upgrade: approximately 1300 euros.
Actually, the package would also have included a power outlet plus an additional heating element for the electric operation of the towel dryer. But we would have accepted that anyway.
The 1300 euros surcharge is worth the experiment for us.
Actually, the package would also have included a power outlet plus an additional heating element for the electric operation of the towel dryer. But we would have accepted that anyway.
The 1300 euros surcharge is worth the experiment for us.
Fuchur schrieb:
We have also been using a ground-source heat pump with passive cooling for one year and find it excellent. I can confirm the mentioned 3°C (5.4°F) difference; of course, shading is still necessary, otherwise the heat gain is simply too high. The cool floor does not bother us at all; on the contrary, it is very pleasant during extreme summer heat. With tiled floors, you notice it more clearly, while in rooms with laminate flooring, the cooling effect is hardly noticeable by the perceived floor temperature when switching it on or off.
The biggest advantage is the low electricity consumption since only two circulation pumps need to operate.
The only issue we are still looking for a solution to is this: since the heating circuits are adjusted according to thermal balancing, the required flow reverses during cooling. The bedroom has the lowest heating water demand but the highest cooling demand. That means adjusting the flow rates twice a year. Are there control valves that can hold intermediate positions? KNX is installed in the house. I can confirm this as well.
We have:
an active-passive cooling system with two boreholes, each 100 m (330 ft) deep. I would definitely choose cooling again, and in my opinion, controlled mechanical ventilation is sufficient (which we have not yet installed).
Of course, it’s a different situation if temperatures exceed 35°C (95°F) for several weeks; then I would consider installing an air conditioning system.
tumaa schrieb:
2 boreholes, each 100 m (330 ft)Normally sufficient (50 W/m) for a 10 kW heat pump. 350 sqm (3,767 sq ft), Zugspitze or boreholes — “simply oversized”?
driver55 schrieb:
Normally, 50 W/m is sufficient for a 10 kW heat pump.
350 sqm (3767 sq ft), Zugspitze or boreholes—“simply oversized”? I wanted more than necessary; going deeper doesn’t hurt, rather the opposite... at least that’s how I understood it :-)
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