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Environmental Controls I/IGEnvironmental Controls I/IGEnvironmental Controls I/IGEnvironmental Controls I/IG
Lecture 11Lecture 11Passive HeatingPassive Heating
Photovoltaics and Active Solar PanelsPhotovoltaics and Active Solar Panels
Lecture 11Lecture 11Passive HeatingPassive Heating
Photovoltaics and Active Solar PanelsPhotovoltaics and Active Solar Panels
Passive Solar HeatingPassive Solar Heating
Zoning:
Solar Gain varies throughout the day
Configure building in accordance thermal patterns and usage needs
Thermal MassThermal Mass
Creates time lag for indoor air temperature changes and reduces temperature swings
L: p. 154, F7.6c&d
Note: Temperature swings ≥ 13ºF are not acceptable
Direct Gain SystemDirect Gain System
Heat gain occurs directly in living space
Mass moderates the “greenhouse effect”
L: p. 154 Fig. 7.6a&b
Direct Gain—Sizing ExampleDirect Gain—Sizing Example
Design a direct gain system with night insulation for Salt Lake City for a 40’ x 20’ (800 sf) house.
L
H
Direct Gain—Sizing ExampleDirect Gain—Sizing Example
Find glazing area
Salt Lake City
800sf x 26%=208sf
L: p.156 T7.7a
Direct Gain—Sizing ExampleDirect Gain—Sizing Example
Find thermal mass area
208sf x 3=624sf 6” thick
Revise mass location to suit designconditions
L: p.157, T7.7B
Direct Gain—Sizing ExampleDirect Gain—Sizing Example
Design a direct gain system with night insulation for Salt Lake City for a 40’ x 20’ (800 sf) house.
If glazing is 8’ tall, how long is the window?208sf/8’=26’ long
Note: verify solaraperture and adjust dimensions accordingly
26’
8’
Thermal Storage WallThermal Storage Wall
Commonly known as a “Trombe Wall”
Space between glazing and wall is not habitable
L: p. 159, F7.9a&b
Sun SpacesSun Spaces
Sun heat gain space separated from living space by thermal mass and operable partitions
L: pp. 164, F.7.12b&c
Sun Space OverheatingSun Space Overheating
Venting and insulation may be needed to prevent overheatingUpper and lower outside vents: each should 5% of glazing area
Upper and lower “common wall” inside vents should be ≥10% of glazing area
L: p.167, F7.14ab
Sun Space Sizing GuidelinesSun Space Sizing GuidelinesGlazing area
Note: convert sloped glazing to the vertical equivalent
L: p.156 T7.7a
Photovoltaics and Photovoltaics and Solar PanelsSolar PanelsPhotovoltaics and Photovoltaics and Solar PanelsSolar Panels
PhotovoltaicsPhotovoltaics
Produce high grade energy (electricity)
NREL PV Testing Facility, Golden, CO
PhotovoltaicsPhotovoltaicsCan be integrated into numerous building products
Entrance canopy, Thoreau Center for the Environment, San Francisco, CA
Roof shingles, NREL Testing Facility,Golden, Co
Solar PanelsSolar Panels
Produce low grade energy (warm/hot water)
Flat Plate Solar Panel, Salt Lake City, UT