[Equest-users] FW: Question about Solar Loads in eQUEST
Keith Swartz
kswartz at ecw.org
Mon Feb 9 07:47:18 PST 2009
Vikram,
It seems to me that your test building just has a lot of thermal mass. That would explain the thermal lag and also the small temperature swings during the day. The sunshine first heats the floor, walls, furniture, etc., which does not heat the room air very much right away. After the sun goes down the stored heat in the floor, etc. is released and warms up the room air late into the night.
_____________________
Keith Swartz, P.E., LEED AP
Energy Engineer / Senior Project Manager
Energy Center of Wisconsin
455 Science Drive, Suite 200
Madison, WI 53711
Phone: 608.238.8276 x123
Fax: 608.238.0523
Email: kswartz at ecw.org<mailto:kswartz at ecw.org>
Web: www.ecw.org<http://www.ecw.org>
Energy Center University
Your gateway to sustainable design training and online education programs.
www.ecw.org/university/<http://www.ecw.org/university/>
________________________________
From: Vikram Sami [mailto:VSami at lasarchitect.com]
Sent: Sunday, February 08, 2009 8:19 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Question about Solar Loads in eQUEST
I have a question about how eQUEST calculates solar heat gain. I have been playing around with a little test building - 50' (E-W axis)x100' (N-S axis). The glass type is 2209 from the glazing library, and Walls are R10 and roof R20 (simplified). I have the building set up with no HVAC system or lights, and a 24/7 equipment load of .25w/sf and 400sf/person occupants.
I also set up hourly reporting for the following:
1. space temps
1. Building Heating & Cooling loads
1. Building cooling load from solar radiation through windows (this is in the building loads option)
So far so good. The matrix below is an average temperature reading for the 21st day of each month. Needless to say, I was really surprised at the lack of diurnal variation in the temperatures.
HR
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1
59
75
74
94
97
103
103
106
95
88
79
52
2
59
75
74
94
96
102
103
105
95
88
79
52
3
58
75
73
93
96
102
102
105
95
87
79
52
4
58
75
73
93
96
101
102
104
94
87
78
51
5
57
75
72
93
95
101
102
104
94
87
78
51
6
57
74
72
92
95
101
101
104
94
87
78
51
7
57
74
72
92
96
101
101
104
93
87
77
50
8
56
74
74
92
97
101
101
106
94
87
77
50
9
59
74
76
94
99
101
101
107
94
87
77
50
10
62
75
78
95
100
102
102
108
94
88
78
51
11
64
75
79
96
101
103
102
109
96
89
78
52
12
64
75
80
98
102
103
103
109
97
90
79
52
13
65
75
80
98
102
104
103
109
98
91
81
53
14
66
76
80
99
102
105
104
109
99
92
82
54
15
67
77
82
98
103
105
104
110
100
93
83
55
16
68
77
83
98
104
105
104
110
101
94
84
56
17
69
76
84
98
105
105
104
110
101
94
83
56
18
68
76
84
97
103
105
103
110
100
92
82
54
19
66
75
83
96
102
105
102
108
99
91
81
53
20
65
75
81
95
102
103
102
107
98
91
80
52
21
65
74
80
94
101
103
101
107
97
90
80
52
22
65
74
80
93
101
102
101
106
97
90
79
51
23
64
74
79
92
100
101
100
106
96
89
79
51
24
64
74
79
91
99
101
100
105
96
89
79
51
Below are the values for building solar cooling load(March 21st) , and I was surprised to see pretty high numbers way into the night. Whats going on here? What am I missing? Is the program really calculating solar heat gain at night?
Any insight would be appreciated.
March 21st
Building Sensible
Heating Load
Building Solar Cooling Load
Building Cooling Load
1
-8365
9893
2873
2
-13659
9130
622
3
-19593
0
0
4
-25131
0
0
5
-30065
0
0
6
-31552
0
0
7
-32832
0
0
8
0
35775
19007
9
0
52932
66006
10
0
63286
88046
11
0
67255
102730
12
0
66069
100438
13
0
64668
91534
14
0
66645
103475
15
0
73743
125298
16
0
83476
141834
17
0
90939
149947
18
0
91079
134182
19
0
76486
95414
20
0
62291
59587
21
0
55129
43966
22
0
49127
32469
23
0
44022
23887
24
-1310
30091
13995
Vikram Sami, LEED AP
Direct Phone 404-253-1466 | Direct Fax 404-253-1366
LORD, AECK & SARGENT ARCHITECTURE
Responsive Design * Technological Expertise * Exceptional Service
www.lordaecksargent.com
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