Is there a calculation for heat loss of a room?

Spies

If you know the outside temperature and inside temperature, and the loss over a time period, is there a particular calculation you can use to see how well (or not) insulated it is?

Verdigris

If you take the volume of air in the room you can look up the amount of energy held by that air, at the higher temperature. You can then do the same for the lower temperature. If you then divide by the time it takes for the temperature to fall then you you will get the rate of loss.

matelodave

try this - Stelrad Heatloss Calculator (starsapp.co.uk) - lots of other calculators on t'interweb.

mumf

My heated rooms are absolutely perfectly warm, insulated,efficient…until the grandchildren leave the b***** doors open! Heat loss 30 seconds flat! LOL. 

markin

mumf said:

My heated rooms are absolutely perfectly warm, insulated,efficient…until the grandchildren leave the b***** doors open! Heat loss 30 seconds flat! LOL. 

Auto door closer.

mumf

I thought that MIGHT make someone 😃!

FreeBear

Spies said: If you know the outside temperature and inside temperature, and the loss over a time period, is there a particular calculation you can use to see how well (or not) insulated it is?

Does this help ?

https://learn.openenergymonitor.org/sustainable-energy/building-energy-model/fabricheatloss

I used a rough & ready measure to determine heat loss in a room. Closed the door & windows. Set up a small (1KW) electric fan heater linked to a thermostat. Recorded the outside temperature and the energy used to maintain the set room temp overnight. Calculated the theoretical heat loss through the external walls, and compared it to the data recorded - The numbers were pretty close even although I ignored window & ceiling heat losses.

ProDave

Unless you actually look up the insulation U values for every wall, floor, ceiling, window and door, and do a proper heat loss model, then anything else you are likely to find is just a rough estimate based on typical values.