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The Measured Energy Impact of Infiltration Under Dynamic Conditions

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Title: The Measured Energy Impact of Infiltration Under Dynamic Conditions
Author: Liu, M.; Claridge, D. E.
Abstract: Energy consumption due to air infiltration is customarily assumed to equal the mass flow rate times the specific enthalpy difference between the inside and outside air. Anderlind showed theoretically that this represents an upper limit for the energy impact of infiltration with an idealized steady-state wall model. Claridge and Bhattacharyya found it to be 20% to 80% of the value customarily used in an indoor test cell and a frame wall under steady-state condition. However, in real buildings, the heat transfer process is a complicated non-linear process, and neither the temperature nor the air flow rate is constant. Therefore, the validity of the steady-state methodology should be proved for dynamic condition. As a preliminary step, dynamic tests were conducted by varying an indoor test cell temperature in a periodic manner for a variety of leakage configurations and air flow rates. The measurement results demonstrated that the cell envelope can be treated as a linear system, and the steady-state methodology or time-averaging technique can be used for the treatment of energy performance when a constant air flow rate is present.
Publisher: Energy Systems Laboratory (http://esl.eslwin.tamu.edu)
Subject: Energy Consumption
Air Infiltration
Air Flow Rate
URI: http://hdl.handle.net/1969.1/92909
Date: 1992-05

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