So I need to calculate how big geothermal heat pumps I need for a building. Heat pump is used for heating and to heat used water.
If I know how many kW's are needed for heating the building and the calculated flow rate of used water, what is the simplest and quickest way to calculate how much power is required from the pump(s)?
Let's say AC heating requires 20 kW, underfloor heating requires 5 kW and flow rate of used warm water 0,3 l/s. And I know dT for AC heating is for example 35 and underfloor heating is 10 and used warm water leaves the pump at 58 degrees celsius.
How should I calculate it? And how do I convert this all to annual kWh used?