Article Figures & Data
Figures
- Figure 1.
Climate zones of California.
- Figure 2.
Annual difference (savings are positive) in heating, cooling and total energy use in Sacramento, expressed as a percentage of unshaded base case energy use (kWh), for single trees located at cardinal (E, S, W) and inter-cardinal (NE, SE, SW, NW) points around an east-west oriented building. Results also given for two west trees (2W), one east and two west trees (2W1E), and seven trees located in all directions except north (ALL).
- Figure 3.
Peak demand savings expressed as a percentage of unshaded base case demand (kW) for tree locations in Figure 2.
- Figure 4.
Annual cooling energy savings expressed as a percentage of the unshaded base case for three trees (two to the west and one to the east) around an east-west oriented building for energy–efficient, attic insulated, and uninsulated homes in five California climate zones.
Tables
- Table 1.
Climate zone, base case annual (kWh) and peak (kW) electrical energy use for cooling, and peak and annual cooling savings summary for two trees on the west and one on the east for the energy efficient home.
Climate zone Major city Heating degree days1 Cooling degree days2 Base case cooling electrical use Annual savings Peak savings kWh kW % kWh $ % kW Hour 2 Santa Rosa 3340 323 881 2.51 38 333 40 19 0.47 15 4 Sunnyvale 2366 325 539 2.29 52 282 34 21 0.49 15 7 San Diego 1355 472 418 2.07 49 206 23 10 0.21 14 8 El Toro 1586 638 1047 2.54 34 355 46 1 0.02 13 9 Burbank 1488 893 1410 2.91 29 403 52 17 0.49 15 10 Riverside 1570 1243 1929 3.13 23 438 57 7 0.23 15 11 Red Bluff 2518 1337 2135 3.34 26 548 66 21 0.69 16 12 Sacramento 2764 708 1490 3.18 34 513 623 23 0.74 16 13 Fresno 2300 1908 2968 3.40 21 628 75 22 0.75 16 14 China Lake 2706 1719 2677 3.24 22 576 75 23 0.75 16 15 El Centro 776 4018 5875 4.08 11 642 83 11 0.46 15 ↵1 One heating degree day (HDD) accumulates for every degree that the mean outside temperature is below 65°F (18.3°C) for a 24 hr period.
↵2 One cooling degree day (CCD) accumulates for every degree that the mean outside temperature is above 65°F (18.3°C) for a 24 hr period.
↵3 $41 in Sacramento County
Month Climate zone 2 4 7 8 9 10 11 12 13 14 15 Jan 45.1 48.7 56.8 54.7 55.4 53.4 44.6 45.0 47.0 43.0 55.6 Feb 50.0 51.9 56.4 56.1 56.8 55.6 49.7 50.3 52.1 48.3 59.3 Mar 52.8 54.5 57.4 57.6 57.7 56.2 52.9 53.4 55.5 52.4 64.8 Apr 55.5 57.1 59.3 60.6 60.7 59.9 58.0 57.5 62.0 56.9 71.3 May 60.5 61.3 62.2 63.6 64.2 64.5 66.9 64.3 69.7 66.0 78.7 Jun 65.7 65.6 65.4 67.4 68.2 70.1 73.3 69.5 77.6 74.8 87.9 Jul 68.1 67.2 69.1 70.9 73.3 76.3 77.7 72.7 82.1 82.3 92.2 Aug 67.4 68.3 70.0 70.7 72.7 76.3 75.6 71.5 80.2 81.5 91.5 Sep 64.8 66.8 68.9 70.1 71.6 72.9 70.8 68.3 73.8 73.1 85.7 Oct 60.0 61.7 65.8 65.3 66.8 66.2 62.5 61.9 65.2 63.2 75.3 Nov 50.7 53.3 59.9 59.3 58.8 57.9 52.0 52.6 53.3 49.9 61.9 Dec 46.4 49.6 56.4 55.7 55.4 52.6 45.1 45.7 46.6 43.3 55.4 Year 57.3 58.8 62.3 62.7 63.5 63.5 60.8 59.4 63.8 61.2 73.3
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