Hi everyone,
I've got a problem with the return temperature dropping too much for my boiler, and the safety cut out comes on. I've been working out the flow rate and came to the conclusion the pump was flowing about 0.32 litres per second of hot water. This is for large four bed detatched house.
The pump is a commercial one and is set on its highest setting:
Grundfos UPS 25-55 180
What sort of flow rate should I be getting in litres/second from the pump? Will the pressure in the system effect how much water the pump can flow?
Way I calculated the flow rate was the output of the boiler, and difference between flow and return temperatures:
Specific heat capacity of water:
4.2 kilojoules/kg
1 celcius raise requires 4.2 kilojoules/litre
:. 30 celcius raise requires 126 kilojoules/litre
Boiler output is 41kw in condensing mode, or 41kilojoules/second
:. boiler is heating 0.32 litres/second
I've got a problem with the return temperature dropping too much for my boiler, and the safety cut out comes on. I've been working out the flow rate and came to the conclusion the pump was flowing about 0.32 litres per second of hot water. This is for large four bed detatched house.
The pump is a commercial one and is set on its highest setting:
Grundfos UPS 25-55 180
What sort of flow rate should I be getting in litres/second from the pump? Will the pressure in the system effect how much water the pump can flow?
Way I calculated the flow rate was the output of the boiler, and difference between flow and return temperatures:
Specific heat capacity of water:
4.2 kilojoules/kg
1 celcius raise requires 4.2 kilojoules/litre
:. 30 celcius raise requires 126 kilojoules/litre
Boiler output is 41kw in condensing mode, or 41kilojoules/second
:. boiler is heating 0.32 litres/second