Anyone else finding the heat emitter guide a pain to work with? I keep finding myself with the same problem.
I can size a radiator based on flow temp and heat loss requirements, but the calculated oversizing factor is in the lower star rating than the flow temp.
Example @ 40°C flow temp
Bedroom with a heat loss of 394w/hr @ 18°C
Radiator 600x0900 K2 output @ 18.5°C ΔT = 439 w/hr
Radiator 600x0900 K2 output @ 50°C ΔT = 1559 w/hr
1559 / 394 = Oversizing factor of 3.9
Star rating chart gives ASHP with 40°C flow temp a 5 star rating but with an oversizing factor of 3.9 only 4 star rating!
So which one is right!?!
Any ideas? I don't fancy oversizing radiators just to please the oversizing factor if it can be avoided.
Thanks in advance
I can size a radiator based on flow temp and heat loss requirements, but the calculated oversizing factor is in the lower star rating than the flow temp.
Example @ 40°C flow temp
Bedroom with a heat loss of 394w/hr @ 18°C
Radiator 600x0900 K2 output @ 18.5°C ΔT = 439 w/hr
Radiator 600x0900 K2 output @ 50°C ΔT = 1559 w/hr
1559 / 394 = Oversizing factor of 3.9
Star rating chart gives ASHP with 40°C flow temp a 5 star rating but with an oversizing factor of 3.9 only 4 star rating!
So which one is right!?!
Any ideas? I don't fancy oversizing radiators just to please the oversizing factor if it can be avoided.
Thanks in advance