Radiant heat exchange calculations in radiantly heated and cooled enclosures

Conference · Tue Aug 01 04:00:00 EDT 1995

OSTI ID:87476

Chapman, K S; Zhang, P ^[1]

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1. Kansas State Univ., Manhattan, KS (United States). Dept. of Mechanical Engineering

This paper presents the development of a three-dimensional mathematical model to compute the radiant heat exchange between surfaces separated by a transparent and/or opaque medium. The model formulation accommodates arbitrary arrangements of the interior surfaces, as well as arbitrary placement of obstacles within the enclosure. The discrete ordinates radiation model is applied and has the capability to analyze the effect of irregular geometries and diverse surface temperatures and radiative properties. The model is verified by comparing calculated heat transfer rates to heat transfer rates determined from the exact radiosity method for four different enclosures. The four enclosures were selected to provide a wide range of verification. This three-dimensional model based on the discrete ordinates method can be applied to a building to assist the design engineer in sizing a radiant heating system. By coupling this model with a convective and conductive heat transfer model and a thermal comfort model, the comfort levels throughout the room can be easily and efficiently mapped for a given radiant heater location. In addition, objects such as airplanes, trucks, furniture, and partitions can be easily incorporated to determine their effect on the performance of the radiant heating system.

• OSTI ID: 87476
• Report Number(s): CONF-950104--
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CAVITIES
CEILINGS
MATHEMATICAL MODELS
RADIANT HEAT TRANSFER
RADIANT HEATERS
RADIATIVE COOLING