Suitable Glazing Selection for Glass-Curtain Walls in Tropical Climates of India

Table 2

Effect of glazed area on annual heating/cooling load (kWh/m²yr) of a building. (a) Delhi. (b) Jodhpur. (c) Chennai.

(a)

Glazed area (%)	Clear-clear			Low-e1-clear			Low-e2-clear			Sol.control-abs			Sol.control-ref
	Heating; load	Cooling; load	Total; load	Heating; load	Cooling; load	Total; load	Heating; load	Cooling; load	Total; load	Heating; load	Cooling; load	Total; load	Heating; load	Cooling; load	Total; load
North
20	2.3	95.7	98.0	1.9	94.7	96.6	2.1	91.3	93.4	3.0	86.0	89.0	2.8	81.9	84.7
35	2.2	108.2	110.4	1.6	107.2	108.8	1.9	100.3	102.2	3.3	90.5	93.8	3.2	84.8	88.0
50	2.4	119.6	122.0	1.5	117.1	118.6	1.8	109.1	110.9	3.9	94.9	98.8	3.6	86.4	90.0
65	2.4	132.2	134.6	1.3	130.1	131.4	1.7	118.4	120.1	4.3	101.2	105.5	3.9	89.5	93.4
80	2.6	143.3	145.9	1.3	140.6	141.9	1.7	125.6	127.3	5.0	105.2	110.2	4.3	90.7	95.0
90	2.7	150.8	153.5	1.2	148.0	149.2	1.7	131.3	133.0	5.2	108.7	113.9	4.5	92.6	97.1
South
20	0.3	106.2	106.5	0.3	104.0	104.3	0.5	97.2	97.7	1.7	88.6	90.3	2.3	82.9	85.2
35	0.1	129.3	129.4	0.1	126.8	126.9	0.1	114.0	114.1	1.3	95.7	97.0	2.2	86.1	88.3
50	0.0	153.3	153.3	0.0	150.6	150.6	0.1	130.6	130.7	1.1	102.7	103.8	2.1	88.4	90.5
65	0.0	180.0	180.0	0.0	176.3	176.3	0.0	150.3	150.3	1.0	111.0	112.0	2.0	92.4	94.4
80	0.0	203.0	203.0	0.0	200.5	200.5	0.0	167.6	167.6	1.0	118.9	119.9	2.0	95.2	97.2
90	0.0	218.9	218.9	0.0	217.1	217.1	0.0	180.2	180.2	1.0	124.8	125.8	2.0	98.0	100.0
East
20	1.3	98.5	99.8	1.2	96.7	97.9	1.5	92.4	93.9	2.4	85.6	88.0	2.6	81.8	84.4
35	0.8	112.9	113.7	0.7	110.8	111.5	1.0	103.0	104.0	2.3	90.9	93.2	2.7	84.1	86.8
50	0.6	128.1	128.7	0.4	125.0	125.4	0.7	113.2	113.9	2.3	95.8	98.1	2.8	85.7	88.5
65	0.5	142.1	142.6	0.3	138.9	139.2	0.5	124.1	124.6	2.2	101.2	103.4	2.9	88.0	90.9
80	0.4	157.1	157.5	0.2	154.2	154.4	0.4	135.7	136.1	2.2	106.9	109.1	2.8	91.0	93.8
90	0.4	167.4	167.8	0.2	163.0	163.2	0.3	142.1	142.4	2.3	109.9	112.2	3.0	91.9	94.9
West
20	1.6	97.2	98.8	1.5	95.9	97.4	1.7	91.9	93.6	2.6	85.2	87.8	2.7	81.7	84.4
35	1.2	110.9	112.1	1.0	109.4	110.4	1.3	101.5	102.8	2.6	90.5	93.1	2.9	84.1	87.0
50	0.9	124.9	125.8	0.7	123.0	123.7	1.0	112.2	113.2	2.7	95.0	97.7	3.0	86.0	89.0
65	0.8	138.9	139.7	0.5	136.1	136.6	0.8	122.2	123.0	2.8	101.0	103.8	3.1	88.5	91.6
80	0.7	153.8	154.5	0.4	151.4	151.8	0.6	133.3	133.9	2.8	106.7	109.5	3.2	90.8	94.0
90	0.6	163.1	163.7	0.3	160.2	160.5	0.6	139.6	140.2	2.9	109.9	112.8	3.3	91.8	95.1

(b)

Glazed area (%)	Clear-clear			Low-e1-clear			Low-e2-clear			Sol.control-abs			Sol.control-ref
	Heating; load	Cooling; load	Total; load	Heating; load	Cooling; load	Total; load	Heating; load	Cooling; load	Total; load	Heating; load	Cooling; load	Total; load	Heating; load	Cooling; load	Total; load
North
20	0.3	105.2	105.5	0.2	104.5	104.7	0.3	100.3	100.6	0.5	95.1	95.6	0.5	90.7	91.2
35	0.3	118.2	118.5	0.2	117.6	117.8	0.2	110.1	110.3	0.7	99.5	100.2	0.6	92.8	93.4
50	0.4	131.3	131.7	0.2	128.7	128.9	0.2	118.8	119.0	0.9	104.6	105.5	0.8	94.8	95.6
65	0.4	143.8	144.2	0.1	142.3	142.4	0.2	129.1	129.3	1.0	110.4	111.4	0.8	97.8	98.6
80	0.4	156.7	157.1	0.1	153.2	153.3	0.2	137.8	138.0	1.3	115.5	116.8	1.0	99.9	100.9
90	0.5	164.1	164.6	0.1	162.1	162.2	0.2	143.6	143.8	1.4	119.0	120.4	1.1	101.5	102.6
South
20	0.0	118.9	118.9	0.0	116.8	116.8	0.0	109.0	109.1	0.2	97.9	98.1	0.3	91.8	92.1
35	0.0	146.3	146.3	0.0	143.0	143.0	0.0	128.3	128.3	0.1	106.5	106.6	0.3	95.1	95.4
50	0.0	173.3	173.3	0.0	168.9	168.9	0.0	147.6	147.6	0.1	114.3	114.4	0.3	98.1	98.4
65	0.0	200.1	200.1	0.0	196.6	196.6	0.0	168.0	168.0	0.0	124.9	124.9	0.2	102.7	102.9
80	0.0	225.0	225.0	0.0	222.1	222.1	0.0	187.5	187.5	0.0	134.0	134.0	0.2	105.4	105.6
90	0.0	242.7	242.7	0.0	239.8	239.8	0.0	200.8	200.8	0.0	140.6	140.6	0.2	108.6	108.8
East
20	0.1	108.8	108.9	0.1	106.7	106.8	0.1	102.2	102.3	0.3	94.7	95.0	0.4	90.1	90.5
35	0.0	124.9	124.9	0.0	122.4	122.4	0.0	113.7	113.8	0.3	100.2	100.5	0.4	92.5	92.9
50	0.0	141.2	141.2	0.0	138.1	138.1	0.0	125.5	125.6	0.2	105.4	105.6	0.4	94.8	95.2
65	0.0	158.1	158.1	0.0	154.1	154.1	0.0	138.0	138.0	0.2	111.4	111.6	0.4	97.1	97.5
80	0.0	175.9	175.9	0.0	172.2	172.2	0.0	151.2	151.2	0.2	118.1	118.3	0.4	100.2	100.6
90	0.0	185.3	185.3	0.0	181.9	181.9	0.0	158.4	158.4	0.2	121.2	121.4	0.4	101.3	101.7
West
20	0.2	108.2	108.4	0.2	106.6	106.8	0.2	102.2	102.4	0.4	95.5	95.9	0.5	90.4	90.9
35	0.1	125.1	125.2	0.1	122.3	122.4	0.2	113.9	114.1	0.4	100.1	100.5	0.5	92.9	93.4
50	0.1	141.0	141.1	0.1	137.8	137.9	0.1	126.2	126.3	0.5	105.3	105.8	0.6	95.9	96.5
65	0.1	158.9	159.0	0.1	155.0	155.1	0.1	138.0	138.1	0.5	111.7	112.2	0.6	98.3	98.9
80	0.1	176.1	176.2	0.0	171.6	171.6	0.1	150.9	151.0	0.5	118.8	119.3	0.6	101.4	102.0
90	0.1	186.4	186.5	0.0	181.7	181.7	0.1	160.3	160.4	0.5	122.5	123.0	0.7	102.2	102.9

(c)

Glazed area (%)	Clear-clear			Low-e1-clear			Low-e2-clear			Sol.control-abs			Sol.control-ref
	Heating; load	Cooling; load	Total; load	Heating; load	Cooling; load	Total; load	Heating; load	Cooling; load	Total; load	Heating; load	Cooling; load	Total; load	Heating; load	Cooling; load	Total; load
North
20	0.0	124.7	124.7	0.0	123.3	123.3	0.0	118.4	118.4	0.0	111.2	111.2	0.0	106.4	106.4
35	0.0	140.8	140.8	0.0	138.1	138.1	0.0	129.8	129.8	0.0	117.5	117.5	0.0	109.2	109.2
50	0.0	155.6	155.6	0.0	152.1	152.1	0.0	140.4	140.4	0.0	122.8	122.8	0.0	111.0	111.0
65	0.0	172.0	172.0	0.0	168.2	168.2	0.0	152.8	152.8	0.0	130.2	130.2	0.0	115.1	115.1
80	0.0	185.1	185.1	0.0	181.3	181.3	0.0	162.7	162.7	0.0	135.8	135.8	0.0	117.0	117.0
90	0.0	195.0	195.0	0.0	191.1	191.1	0.0	170.1	170.1	0.0	140.2	140.2	0.0	119.4	119.4
South
20	0.0	132.5	132.5	0.0	130.3	130.3	0.0	123.9	123.9	0.0	114.1	114.1	0.0	107.3	107.3
35	0.0	154.4	154.4	0.0	151.0	151.0	0.0	139.6	139.6	0.0	122.2	122.2	0.0	110.9	110.9
50	0.0	175.3	175.3	0.0	171.3	171.3	0.0	154.3	154.3	0.0	129.5	129.5	0.0	114.0	114.0
65	0.0	198.1	198.1	0.0	193.4	193.4	0.0	171.2	171.2	0.0	139.3	139.3	0.0	118.8	118.8
80	0.0	217.3	217.3	0.0	212.5	212.5	0.0	185.7	185.7	0.0	146.6	146.6	0.0	121.5	121.5
90	0.0	230.8	230.8	0.0	226.3	226.3	0.0	196.2	196.2	0.0	152.4	152.4	0.0	124.5	124.5
East
20	0.0	124.9	124.9	0.0	123.0	123.0	0.0	118.1	118.1	0.0	110.5	110.5	0.0	105.8	105.8
35	0.0	141.0	141.0	0.0	138.5	138.5	0.0	130.0	130.0	0.0	116.3	116.3	0.0	108.2	108.2
50	0.0	157.3	157.3	0.0	153.6	153.6	0.0	141.5	141.5	0.0	122.2	122.2	0.0	110.3	110.3
65	0.0	173.6	173.6	0.0	169.6	169.6	0.0	153.6	153.6	0.0	127.9	127.9	0.0	113.0	113.0
80	0.0	190.7	190.7	0.0	186.4	186.4	0.0	166.1	166.1	0.0	134.9	134.9	0.0	116.5	116.5
90	0.0	200.5	200.5	0.0	195.9	195.9	0.0	173.7	173.7	0.0	138.3	138.3	0.0	117.5	117.5
West
20	0.0	125.0	125.0	0.0	123.5	123.5	0.0	118.6	118.6	0.0	110.7	110.7	0.0	105.9	105.9
35	0.0	141.9	141.9	0.0	139.3	139.3	0.0	130.8	130.8	0.0	116.8	116.8	0.0	108.7	108.7
50	0.0	158.2	158.2	0.0	154.4	154.4	0.0	142.4	142.4	0.0	122.8	122.8	0.0	110.8	110.8
65	0.0	174.6	174.6	0.0	170.3	170.3	0.0	154.6	154.6	0.0	128.9	128.9	0.0	113.7	113.7
80	0.0	191.8	191.8	0.0	187.0	187.0	0.0	167.2	167.2	0.0	136.5	136.5	0.0	117.2	117.2
90	0.0	202.0	202.0	0.0	197.2	197.2	0.0	174.6	174.6	0.0	140.3	140.3	0.0	118.6	118.6