The discussions in this thread, and my associated one (click here), have been very interesting and thought-provoking but have not yet really answered the question I posed in my OP, basically asking how reasonable/credible people felt my heat-loss calculations were. In particular, the one response above which was addressing that question, was somewhat vague, namely ...
To remind you all, I am talking about a fairly large late Victorian 3-storey mid-terraced house, with a total floor area of about 110 m²). Other than for the pitched roof, it’s fairly poorly insulated, with solid 9” brick external walls, single-glazed wooden-framed windows and a suspended wooden ground floor. It is a 'narrow but deep' house - some 5m x 17m overall, hence with relatively little in the way of outside walls, and the two adjacent properties are occupied and heated.
My initial heat-loss calculations suggested a total heat energy requirement (for space heating alone) of around 11 kW, with most rooms requiring a radiator of around 1.5 kW. I have subsequently re-visited those calculations with various alterations to the assumptions, and the 'worst case' of these suggests a total of 13-14 kW, with rooms most commonly needing radiators in the ballpark of 1.5-2.0 kW.
The question of how I translate estimated radiator heat outputs into radiator size (depending upon flow temp and delta T) has been (and continues to be) discussed at length in the other thread.
So, retuning to my initial question, I wonder if people feel that (given the nature of the property) my heat-loss calculations for this house are reasonable/credible - and, if not, roughly what they would have expected the total heat-loss (hence radiator requirements) to be?
Kind Regards, John
I would be very interested to know in which direction gas112 felt that my calculations were 'massively out', and hence in what ballpark he would have expected the answer to be.
To remind you all, I am talking about a fairly large late Victorian 3-storey mid-terraced house, with a total floor area of about 110 m²). Other than for the pitched roof, it’s fairly poorly insulated, with solid 9” brick external walls, single-glazed wooden-framed windows and a suspended wooden ground floor. It is a 'narrow but deep' house - some 5m x 17m overall, hence with relatively little in the way of outside walls, and the two adjacent properties are occupied and heated.
My initial heat-loss calculations suggested a total heat energy requirement (for space heating alone) of around 11 kW, with most rooms requiring a radiator of around 1.5 kW. I have subsequently re-visited those calculations with various alterations to the assumptions, and the 'worst case' of these suggests a total of 13-14 kW, with rooms most commonly needing radiators in the ballpark of 1.5-2.0 kW.
The question of how I translate estimated radiator heat outputs into radiator size (depending upon flow temp and delta T) has been (and continues to be) discussed at length in the other thread.
So, retuning to my initial question, I wonder if people feel that (given the nature of the property) my heat-loss calculations for this house are reasonable/credible - and, if not, roughly what they would have expected the total heat-loss (hence radiator requirements) to be?
Kind Regards, John
