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TABLE 1: The Window Information System calculation tool
Window surface area	1000 m²	Cost of natural gas for heating	0.027 拢/kWh
Costs of electricity for cooling	0.10 拢/kWh	Average outside temperature	9掳颁
Solar irradiation	753 W/m²	Average inside temperature	20掳颁
Average sunshine hours/day (all of above figures cam be changed by user)	3	Average hours of thermal loss/day	14
Comparison of window systems and energy costs	Glazing Single 3 mm glazing	Internal shading + glazing Verasol 812 + 3 mm glazing	听
Solar factor (g-value)	87	28	听
U-value	5路9	2路2	听
Air conditioning
Solar energy entering m² of window	655 W/m²	211 W/m²	听
Solar energy entering through windows	55路1 kW	210路8 kW	听
Annual savings on electricity	听	听	243 238 kWh
Annual CO₂ emission	225 964 kg	72 724 kg	听
Annual reduction of CO₂ emission	听	听	153 240 kg
Annual costs for cooling (1 kW = 拢0.10)	拢35 867	拢11 543	听
Annual savings on air conditioning	听	听	拢24 324
Heating
Energy loss through windows	64路9 kW	24路2 kW	听
Required quantity of natural gas/year	414 549 kWh	154 578 kWh	听
Annual savings on natural gas	听	听	259 971 kWh
Annual CO₂ emission	77 935 kg	29 061 kg	听
Annual reduction of CO₂ emission	听	听	48 875 kg
Annual costs for heating (1 kWh = 拢0.027)	拢11 193	拢4174	听
Annual savings on heating	听	听	拢7019
Total annual reduction of CO₂ emission	听	听	202 114 kg
Total annual savings on a/c and heating	听	听	拢31 343

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