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Heat and moisture production within livestock buildings can vary due to differ ent building and management systems. The use of existing commercial facilities provides an excellent laboratory for evaluating these systems. The major heat losses from a well-insulated livestock building result from ventilation, with a smaller proportion of the animal heat production being lost by transmission through the structure. Measuring heat and moisture loads from such a facility, however, presents various instrumentation problems, including the need for accuracy combined with relative convenience of installation and maintenance of measuring devices. One such problem concerns the measurement of heat flows through the various components of a building. A method of calculating heat loss through a building component such as a wall is to measure the temperature gradient across the wall. This could be either a surface-to-surface or air-to-air temperature gradient (American Society of Heating, Refrigeration and Air-Conditioning Engineers (ASHRAE) 1977). With these methods, steady state conditions are assumed and the thermal resistance of the individual components are approximated. Another method of measuring heat flow is to utilize heat flux plates. This method is straightforward and offers the advantage that neither a steady state condition nor thermal resistance values of the structural components need to be assumed (Fuchs and Tanner 1968).
comparison of methods for measuring conductive heat losses from livestock buildings
DeShazer, J. A., Feddes, J. J. R. and J. B. McQuitty 1982. COMPARISON OF METHODS FOR MEASURING CONDUCTIVE HEAT LOSSES FROM LIVESTOCK BUILDINGS. Canadian Agricultural Engineering 24(1):1-4.
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