From the “Green Station” to the “Blue Station”: the role of the renovation of railway stations in the ecological transition of cities. Calculation model and possible measures for mitigation and compensation of impacts.

City, Territory and Architecture

An interdisciplinary debate on project perspectives

Table 14 Heating degree days (HDD), cooling degree days (CDD) and total degree days for the city of Rome

Month	T_day	T_night	T_inner	Days	D_day	D_night	DD	HDD	CDD	Total DD
January	11.1	4.0	18.0	31	9.33	14.67	319.9	319.9	0.0	319.9
February	12.5	4.7	18.0	28	10.37	13.63	246.6	246.6	0.0	246.6
March	15.3	6.9	18.0	31	11.58	12.42	176.6	176.6	0.0	176.6
April	18.6	9.4	18.0	30	13.22	10.78	40.0	40.0	0.0	40.0
May	23.2	13.1	20.0	31	14.35	9.65	− 53.1	0.0	53.1	53.1
June	27.5	16.7	20.0	30	15.12	8.88	− 191.2	0.0	191.2	191.2
July	30.5	19.2	20.0	31	14.45	9.55	− 275.9	0.0	275.9	275.9
August	30.1	19.1	20.0	31	13.52	10.48	− 247.2	0.0	247.2	247.2
September	26.6	16.6	20.0	30	12.31	11.69	− 119.8	0.0	119.8	119.8
October	21.2	12.5	20.0	31	11.07	12.93	51.7	51.7	0.0	51.7
November	15.8	8.4	18.0	30	9.53	14.47	170.5	170.5	0.0	170.5
December	12.2	5.3	18.0	31	9.13	14.87	285.2	285.2	0.0	285.2
Year	20.4	11.3		365				1290.3	887.1	2177.5

The heating requirement, for a winter day, is represented by the difference between the external temperature and the reference average internal temperature (18°); HDD is the sum of these offsets for all days of the year. Similarly, CDD is the sum of the daily summer differences between the external and internal reference temperatures (20°). DD is the sum of the absolute values of HDD and CDD