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

Table 3

Monthly results under different climatic conditions.

		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	36.0	15.2	20	18	13.0	16.2	2.4	5.6
	Feb	33.2	13.3	16	13	13.8	17.4	2.3	5.9
	Mar	33.1	13.6	15	11	14.9	17.4	2.2	4.7
Lisbon	Apr	34.5	12.5	12	8	15.7	17.8	1.9	4.0
	May	34.3	12	9	4	16.6	17.5	1.7	2.6
	Oct	28.6	10.2	6	5	17.7	19.7	1.4	3.4
	Nov	30.1	14.4	13	13	15.5	18.2	2.0	4.7
	Dec	33.6	14.4	19	17	13.4	16.8	2.4	5.8
	Jan	35.2	35.5	58	62	2.5	2.8	6.2	6.5
	Feb	33.7	34.9	44	48	4.8	5.3	5.6	6.1
	Mar	32.0	33.8	44	51	6.2	7.0	5.3	6.1
Oslo	Apr	30.9	29.6	33	39	8.9	10.0	4.4	5.5
	May	22.9	24.3	16	22	14.2	15.4	3.0	4.2
	Oct	18.7	32.9	21	33	11.5	11.1	4.8	4.4
	Nov	20.1	31.6	32	42	8.2	7.2	6.4	5.4
	Dec	26.0	35.7	45	53	5.0	4.2	6.5	5.7