Flow rate

[Potatoman]

Hi, can anybody tell me what the flow rate from my 9kw LG ASHP should be given a 5.8 KW heat loss and using glycol, thanks

[JoeBano]

Good video on how to work it out. Don’t know glycol heat capacity, someone will know here. 

[ReedRichards]

You're never going to have a fixed 5.8 kW hot loss, though.

[PhilT]

4 hours ago, Potatoman said:

Hi, can anybody tell me what the flow rate from my 9kw LG ASHP should be given a 5.8 KW heat loss and using glycol, thanks

This is the formula with a few example numbers. Set up a spreadsheet and model the variables to get your flow rate, or whatever parameter you want.

 

Formula for Energy Delivery		M	x	Cp	x	ΔT	=	Q
		flow rate		coefficient		temp diff		output
		l/s		water/glycol		degC		kW
		0.35	x	4.085	x	4.00	=	5.7
litres/minute		21.00
litres/hour		1260
Water Cp		4.18
Fernox HP-5c @ 20%		4.085		-2.3%