Application of a pipeline at the lower side of copper roofs to use them as solar collectors was investigated. An optimized module capable of converting a wide fraction of solar radiation into heat, and at the same time preserving the esthetic quality of the roof, was designed. Exergy analysis,...

A theoretical simulation of flat plate collector performance, with temperature-dependency for material and coolant properties, is presented and the simulation is performed without asserting an a priori value for an overall heat loss coefficient of the collector. This approach differs from many...

The decline in the service flow from a stock of capital goods with age, due to the physical retirement of capital units and to the gradual loss of efficiency of each unit remaining, can be described by survival curves and efficiency curves. The paper reconsiders the relationship between these...