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Sierra Anseeuw, ‘11, and Grace Kellogg, ‘13, Beloit College Sustainability Fellows Program. - PowerPoint PPT Presentation
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Step 1 Collecting Data• Structural components determine a building’s heat loss and gain.
Step 2 - Calculating Loads:• The Department of Energy’s Weatherization Assistance Program (WAP) calculates heating/cooling loads. This program uses slightly more complicated calculations than most “self-auditing” websites or books suggest.
Step 3 - Utilizing the Output Data:• WAP provides a summary of loads, making it easy to see the greatest energy losses. Data can also help when installing or replacing heating and cooling systems, preventing one from choosing a system that is either too small or unnecessarily large.
Energy Use on the Beloit College Campus
Bushnell Hall; Windows and doors are a significant source of heat loss in the winter and heat gain in the summer
Whitney Hall; Measurements of a building’s wall area are used, along with its construction materials, to calculate heat transmission
Beloit College Human Resources; A window’s orientation and shading affect incident solar radiation and impact the cooling load
World Affairs Center; Insulation in attics and walls reduces the rate of thermal transmission. Adding insulation can reduce the cost of both heating and cooling
Beloit College Human Resources; WAP uses many foundation characteristics to determine its impact on heating/cooling loads
Blaisdell Hall; Energy audits can assist in decision making when replacing or adding equipment to a house.
Heat Loss
Heat G
ain
72.9 kBtu/hr
1.2 kBtu/hr
37 kBtu/hr
9.1
kB
tu/h
r
From Walls
From Windows and Doors
From Floor
From Ceiling
Performing an Energy Audit:
Energy audits are used to assess a building’s energy use. We performed audits of heating and cooling loads in more than 30 campus buildings, generating data which helps determine cost-effectiveness of energy saving modifications
Building Load = ∑UAWall + ∑UAwindow + ∑UA attic+
∑UAfoundation + ∑ UA infiltration
*Where UA is equal to the conductance of a component
Beloit College Human Resources
Sierra Anseeuw, ‘11, and Grace Kellogg, ‘13, Beloit College Sustainability Fellows Program