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CHPS Tip: CA-CHPS and Modeling Naturally Ventilated Spaces

By Ed Wansing, CHPS Technical Programs Coordinator
Monthly column in the CHPS E-Bulletin

CA-CHPS Credit EE1.0: Minimum Energy Performance
For the 2006 edition of the CA-CHPS Criteria, design teams must achieve a reduction of 10% below the requirements of Title 24 2005. The energy performance must be documented with a California Energy Commission (CEC) approved energy simulation tool. The tool should be used in compliance mode and apply the alternative calculation method (ACM) modeling rules.

Credit Interpretation Request
How can a project be modeled to take advantage of reduced air conditioning? The California Energy Commission approved tools require at least a minimally compliant air conditioning system to be modeled, which does not properly reflect the design intent of the project.

Credit Interpretation
The CA-CHPS criteria allows the use of Savings by Design to take advantage of non-air conditioned spaces, allowing design teams to achieve the full benefits of limiting the use of air conditioning. This approach greatly reduces the energy consumption in school buildings, and the first costs of construction associated with installing the cooling equipment.
December 22, 2010 (San Francisco, CA) A monthly tip from Technical Programs Coordinator Ed Wansing ~order=2010-12-22
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