You have wrong DHW flow rates for the Worcester boiler.
24 kW gives about 9 li/min and you can scale that.
In the UK we work on a 35 C increase which is fine in summer but the flow has to be reduced during the winter when the i/c water is cooler.
In the Med its common for showers to be lower flow rate but in the UK we assume 10 li/min as normal.
I am surprised at the high heat loss of your property!
Tony
The figure came out of the 40CDi brochure.
You are not the first to comment on the high heatloss. The property has 180m2 and 565m3 of air due to 4,1m ceilings. There are two internal patios and 20 balcony windows 2,1x1,5m.
Calc based on following materials:
Windows 1,50 W/m²K
Ext wall 2,20 W/m²K
Int wall 1,20 W/m²K
Marble floors 2,00 W/m²K
Roof (wooden, no insulation- its a communal area) 1,90 W/m²K
Roof false- 1,90 W/m²K
Glass roof area 4,00 W/m²K
Air change loss 0,36 W/m³h
The max requirement uses the max historical external temp of -5,5deg, with an average winter temp 5 deg heating the requirement falls to 16kW. So we are looking at a combi 22kw heating and 30kw hot water.
I did this in excel, heard there are programmes to calculate heatloss- what would you recommend?
