Ventilated Double Window for the Preheating of the Ventilation Air Comparison of Its Performance in a Northern and a Southern European Climate

Table 4

Monthly results under different climatic conditions, after adjustments of the system.

		Mean value of air flow rate; (m^3/h)		Total heat gain; (kWh)		Mean value of incoming; air temperature; (°C)		Mean value of air; temperature rise; (°C)
		North	South	North	South	North	South	North	South
	Jan		26.9		23		14.7		4.1
	Feb		24.1		18		15.9		4.4
	Mar		24.9		15		16.1		3.4
Lisbon	Apr		25.3		11		16.4		2.6
	May		21.4		5		16.7		1.8
	Oct		18.1		6		18.7		2.4
	Nov		25.7		16		16.9		3.4
	Dec		24.4		21		15.4		4.4
	Jan	18.2		44		5.3		9.0
	Feb	17.4		33		7.3		8.1
	Mar	16.5		33		8.6		7.7
Oslo	Apr	15.9		24		10.9		6.4
	May	12.1		12		15.5		4.3
	Oct	9.8		15		13.0		6.3
	Nov	10.5		22		10.2		8.4
	Dec	13.5		32		7.4		8.9