Solar Energy Programs for HP-41 and TI-59 Calculators

This book presents thirteen programs that can be used directly with HP-41 or TI-59 programmable calculators. Extensive notes are provided to help the user, and the program equations are keyed to the text Solar Energy Thermal Processes. The programs provided include: EXRAD, which computes daily, hourly or instantaneous extraterrestrial radiation on a horizontal surface on any given day; R, which provides the instantaneous radiation on an inclined surface given the instantaneous horizontal radiation; RBAR1, which gives R and (TO:) for tilted surfaces directly facing the equator; RBAR2, which calculates the same factors as the more limited RBAR1 for tilted surfaces rotated at azimuth-angles of up to ± 90° from due south; UTOP, which uses Klein's correlation to compute collector top loss coefficients; TRANS, which computes (TO) as a function of angle of incidence; CORFAC, which computes modified F R , (ja), and UL values for use when ducts and a heat exchanger cause losses between the collector and storage; STORE, which provides formatted storage of local data for monthly average insolation, ambient temperature, and degree days; FCHART, a programmed version of the monthly f-chart method for solar space-heating and DHW systems; PHIBAR, which calculates $, the monthly-average daily utilizability function from data provided by program RBAR1; PHIF, which programs the i>, f-chart design method for space heating, air-conditioning and industrial process heat; DG, which provides the unutilizability design method developed for direct-gain passive systems (a fairly detailed description of the method is provided); and ECON, which provides a life-cycle cost analysis of a solar heating system and a comparable conventional system.