Implementation of separate sensible and latent cooling applications: building energy performance modeling and validation

Mallory L Schaus, Purdue University

Abstract

Separate sensible and latent cooling (SSLC) has been demonstrated as a viable methodology for substantially reducing cooling equipment energy consumption, while actively controlling the relative humidity of a space. The use of SSLC technologies can result in improvements to indoor air quality, through removal of excess humidity in a space, caused by either outdoor conditions, internal gains, or building airtightness. The negative effects of high relative humidity indoors can be mitigated, and improved building energy performance can be achieved. Studies have shown that SSLC configurations can result in space cooling equipment energy savings of greater than 30%, providing a direct pathway for energy reduction in many locations across the United States. This study examines the effectiveness of implementing SSLC technology in residential applications, specifically in high-performance homes. A system comprised of a central, conventional air handler to remove sensible loading, combined with a high-efficiency, direct expansion dehumidifier for removal of the latent load, is investigated. The modeling of system components was completed by means of a transient building energy model, and quasi-steady models for all cooling and dehumidifying equipment. Validation was completed through the construction, implementation, and testing of a full-scale, high-efficiency home, as a part of the Department of Energy 2011 Solar Decathlon. The model can be used for analysis of building performance enhancement through retrofit applications or in new construction, to determine the optimal design for a given scenario while taking into account the indoor air quality of the space and potential energy savings.

Degree

M.S.C.E.

Advisors

Horton, Purdue University.

Subject Area

Civil engineering

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