SOLAR HEAT GAIN FACTORS AND HEAT-LOSS COEFFICIENTS FOR PASSIVE HEATING CONCEPTS

The concept of solar heat pin factor has been introduced for calculati ng the net energy gain of passive heating elements and other component s of a building as a result of incident solar radiation. For passive h eating concepts (namely, the direct gain, mass wall, water wall, Tromb e wall, and solarium), exact analytical expressions have been obtained for the solar heat gain factors and the corresponding overall heat lo ss coefficients. These will allow a building designer to calculate imm ediately the overall heat gain/loss in a building. Numerical calculati ons have been done for typical values of solar radiation and ambient t emperature of typical climatic conditions in India. The method has bee n compared with the other methods reported in the literature so far. A good comparison is found between the earlier methods and the method o f using solar gain factors and the corresponding heat transfer values.