The selection of design solar irradiance in the current ASHRAE and CIBSE design handbooks isindependent on design dry-bulb and wet-bulb temperatures. The probability that the load would notexceed the system capacity determined on this basis may not match the reliability level that the designweather data were meant to safeguard. Hence, a statistic method was developed for the rationalselection of coincident solar irradiance, dry-bulb and wet-bulb temperatures.
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