rolling-orbit

Hi Both Thanks for having a look at this! So instead of looking up degree days from the table on source 1, I could use different between "minimum internal temperature" and "average outside temperature" for the days of the year that I heat the house. Average U-value of windows (glazing and frame): 1.0 W/m²K Area of windows: 10 m² Minimum internal temperature: 19°C. The mean annual outside temperature[3]: 10°C Temperature different: 9°C Heating days: 180 (1.0 x 10 x 9 x 180 x 24)/1000 = 389 kWh a year heat loss through windows. I've added a table below in case its useful for other people. You both can't see anything crazyly wrong with either approach as a first approximation heat loss from central heating through windows however? U-value of glazing and frame (W/m²K) Heat loss through windows using annual mean outside temperature (kWh) Heat loss through windows using degree days table (kWh) 1.2 467 544 1 389 453 0.8 311 363 [3] https://www.arcgis.com/apps/dashboards/d863748b238c4f72b2aed0718591b66b

Hi All Is this a correct way to work out the approximate heat loss from central heating through windows? Average U-value of windows: 1.0 W/m²K Area of windows: 10 m² Degree days in London[1]: 1889 (1.0 x 10 x 1889 x 24) / 1000 = 453 kWh a year heat loss through windows. I'm a little unsure about it, especially degree days. All else held the same, I'm trying to quantify the difference in heat loss between different window u-values (e.g. 1.2, 1.0, 0.8), very approximately. I understand perception of heat in the room via radiation is also an important subjective benefit of lower u-value windows, however I wanted to start with the above heat losses first. Thanks! 😁 [1] https://www.open.edu/openlearn/nature-environment/energy-buildings/content-section-2.4.2 [2] https://www.heatspaceandlight.com/calculate-much-energy-windows-will-save-u-values/