The approximate temperatures within a flat-plate solar collector under transient conditions
The approximate temperatures within a flat-plate solar collector under transient conditions
- Inl. J. Heat Mass Transfer, 28, p.433-440, 1985 .
Some of the heat resistances of a conventional flat-plate solar collector are smaller than others. Using this property, analytic approximations of the temperatures within the collector at a moment t = 0, are derived. They are expressed as functions of the time-varying behaviour of the insolation, the ambient temperature and the fluid outlet and inlet temperature. In particular, the fast-varying temperature of the fluid near the collector inlet has been shown. Some applications are mentioned, in which coarser approximations of the temperatures are possible. A simple, one-capacity differential equation describes the fluid temperature, in that case.
Some of the heat resistances of a conventional flat-plate solar collector are smaller than others. Using this property, analytic approximations of the temperatures within the collector at a moment t = 0, are derived. They are expressed as functions of the time-varying behaviour of the insolation, the ambient temperature and the fluid outlet and inlet temperature. In particular, the fast-varying temperature of the fluid near the collector inlet has been shown. Some applications are mentioned, in which coarser approximations of the temperatures are possible. A simple, one-capacity differential equation describes the fluid temperature, in that case.