No description available.

No description available.

No description available.

No description available.

No description available.

A Transient Simulation program (TRNSYS) was used to formulate the simulation of a domestic hot water system. Solar percent utilization and collector efficiency was observed for different set temperatures and hot water demand. The effect of hot water demand pattern on these parameters was likewise investigated. Regression analysis was used to forecast solar percent utilization with respect to set temperature and daily hot water demand.

An absorption principal cooling system, currently proposed for installation and evaluation at the Florida Solar Energy Center (FSEC), is described as a system and modeled through use of "A Transient Simulation Program (TRNSYS)" developed by the University of Wisconsin. The system model included the FSEC building with its heat gains and losses due to insolation and conduction. System element and cooling load parameters are estimated and the basis of estimation is included to help identify adjustments required to fit the model to the final system installation as new or more complete data becomes available. Deficiencies noted in the current TRNSYS system are identified as potential improvement areas. An empirical model of the 25-Tom Arkla Absorption Water Chiller proposed for the FSEC system is developed front he factory performance test data and implemented through use of TRNSYS algebraic function modules. A simplified block diagram of the FSEC cooling system is described and the basic TRNSYS modules required to model the system are also indicated in block diagram form. The individual modules with parameter designations and values, input designations and initial values, and output designations are each included. Finally, the model listing and simulation output data for a seven day period, utilizing actual solar insolation and ambient temperature data, are provided to demonstrate the model and reasonableness of results. Validation of the baseline model requires careful insertion of actual system parameters, after final system installation, and comparison of system test results against model results obtained using the test period insolation and temperature data.

A mathematical computer model has been developed for the prediction of the thermal performance of a flat-plate solar collector used as the generator for an absorption cycle cooling system. The system employs thermoelectric cells to power its pump. The exponential relationship between the auxiliary energy and the collector area is used to optimize the system. It is predicted that the system will become feasible when the fuel price is raised to four times the current value.

No description available.

The reference heat source (RHS) is an electrical calorimeter used with solar collector test facilities. It can be used to calibrate the test facility or to measure the thermal performance of a collector. The RHS described here was designed to be accurate enough to be used as a standard for verification of test facility calibrations. The core of the unit consists of resistance heaters, platinum resistance thermometers, a thermopile, and flow mixers. This core is surrounded by a thermally driven copper shield to control heat loss. The electrical power input to the core is measured with an electronic power transducer. The output of this transducer as well as the temperature sensors is indicated on digital panel meters. All measurements are made independent of the test facility's data acquisition system. The entire unit is mounted on a 0.5 x 1.5 m cart for portability. In operation, liquid from the test facility is circulated through the RHS core. The liquid is heated by passing over the resistance heaters. If the test facility's calibrations are under investigation, the RHS input power and temperatures are compared with those recorded by the test facility. If a collector is under test, the RHS is placed in series with the collector. The power input to the RHS core heaters is adjusted to give a temperature rise through the RHS equal to some fraction (usually one-half to one) of the temperature rise across the collector. Since the same mass flow passes through both the RHS and the collector, the energy gain in the collector is simply the RHS input power multiplied by the ratio of the temperature rises. This RHS was designed for use at temperatures from 0°C to 100°C and liquid flow rates from one to forty liters per minute. The results presented here were obtained using typical flat plate solar collectors. The operational experience obtained in an active test facility is discussed with regard to the achieved accuracy, practical operation, and recommendations for further applications.