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An excerpt from Deterministic lnsolation Model, Deterministic lnsolation Model Program Description and User's Guide, USDoE, SAND78-7044 {FEB 1979}, Rockwell International Corporation (Space Division) {JUL 1978}, FAO 07-6971, Al-78-23, 55 pgs.

"                                   FOREWORD
       This is the computer program description and User's Guide for the Deterministic Insolation Model Program, developed under the Department of Energy …

                                   1.0 INTRODUCTION
       This report describes a simple mathematical model for estimating the monthly average insolation experienced by a fixed or tracking collector … It is designed to fulfill the need for a rapid, economical method of assessing the availability of solar radiation as a basis for site selection and system performance estimation. It attempts to make maximum use of predictable factors, introducing random factors associated with local weather in the simplest way possible.
       The method lends itself to a formulation in terms of simple mathematical expressions and is suitable for use by hand calculators and small computers. It has been implemented by a three-module program written for the Texas Instruments SR-52 Programmable Slide-Rule Calculator, as described herein …
       The model described here is intended for the rapid, approximate analysis …

                                   3.0 USER'S GUIDE
3.1 INPUT REQUIREMENTS
       Data for each month is entered into the SR-52 calculator by keystroke. It is retained in its designated storage location as long as the calculator power is left on unless modified by subsequent storage operations. In particular, data used or generated by one module can be retained for use by another module. This feature has been used to reduce data entry operations substantially. Table 2 shows the data storage structure of the three program modules. Permanent data (locations 98, 99, 19) need not be re-entered when running multiple cases. Recommended values are given in the Glossary. Data pertaining to the season (locations 05, 06, 07, 08) may be obtained from Table 1. It need not be re-entered when comparing locations at the same time of year …

                                   4.0 PROGRAMMERS INFORMATION
4.1 HARDWARE REQUIREMENTS
       The SR-52 programmable calculator is battery operated and will execute the program modules without any additional equipment. For extended operating times, it may be necessary to plug the calculator into the AC913O Adapter/Charger. In this configuration, batteries are recharged while calculations proceed. When the calculator is mounted on the PC1OOA printer, the battery pack is separately mounted and charged while calculations proceed …

4.4 PROGRAM LISTINGS AND FLOW CHARTS
       Annotated listings and corresponding functional flow charts are provided for each module. When a module has been loaded on the calculator attached to the printer, a listing may be produced for comparison, using the following keystroke sequence:
SR-52
1. CLEARNESS NUMBER AND CLOUD FACTOR
2. FLAT COLLECTORS AND TWO-AXIS TRACKERS
3. SINGLE-AXIS TRACKERS …

                                   5.0 INSTALLATION ENVIRONMENT
5.1 ELECTRIC POWER
       The SR-52 calculator may be operated on batteries, independent of any external power source. If an inverter or printer is used, a standard 115 V ac/60 Hz outlet is required.
5.2 MAGNETIC CARDS
       Program instructions are contained in the keystroke sequences given in the Program Listings (Section 4.3), and can be entered into the calculator directly …
It is more convenient to enter instructions by magnetic card. Each module is contained on both the A and B sides of a single card. The two sides are read in sequence by carrying out the keystroke operations described in the section on sample problems and inserting the appropriate end of the card into the slot on the right side of the calculator. "

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