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.

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.

Solar energy constitutes one of the main alternatives for facing the energy problems of the future, taking into account the foreseeable depletion of the fossil fuels. Transpired solar air collectors are relatively simple alternatives, which do not need a continuous supervision and are mostly maintenance free. Their life cycle is relatively high, around 25 years, and the total investment can be fully recovered in the short-term. The aim of this master’s thesis is to analyze the feasibility of installing transpired solar air collectors as secondary systems in big industrial buildings, for heating purposes. The collectors would be designed for compensating the heat losses of a building which is mainly heated up by a heat pump system. Precisely, this work tries to evaluate the profitability of installing these collectors in Gävle, taking into account the particularities of this location in the considered study. This project work is focused on testing if these systems can provide enough thermal energy for heating up big-sized industrial buildings. For this purpose, firstly, the heat demand of the building for each month was calculated; secondly, the maximum output from the collector was estimated, using WINSUN simulator; and, finally, the energy difference that had to be covered by the main system was calculated. Once this was done, the yearly running cost for the main system and the total investment for the transpired air solar collector were estimated. Due to the lack of experimental data, the obtained results can only be taken as approximations. All the calculations and estimations have been made using WINSUN, a simulator that has been configured according to the particularities of the project. The results show that the solar collector provides a total thermal output of 29.700 kWh/year (system which has a total investment of 77.000 SEK). The total heat demand of the building is estimated to be of 87.100 kWh/year, being 51.800 kWh/year fulfilled by the heat pump system (which has a yearly running cost of 24.000 SEK/year). The collector has an average efficiency of 51,04%.

published_or_final_version / Mechanical Engineering / Master / Master of Science in Engineering

Vita. / Digitized by Kansas Correctional Industries

In recent years, an increasing pursuit of product appearance, so the surface appearance of the product are the main arc, but if we can develop the flexible fuel cells, fuel cells will be able to scratch-type adhesive on the product curved surface, not only for product supply and portable, low pollution have great potential for portable fuel cells. Performance of the experiment found that the decision lies in the amount of carbon fiber bundles, softness and spring pressure on the uniformity imposed by such factors. The experiment that bending radius of curvature of 45.5cm, the battery around the X, Y, XY axis deflection performance and the performance is not the same, and the radius of curvature around the X-axis deflection narrow, performance is not reduced, around the XY axis deflection narrow the radius of curvature, the performance has not decreased significantly, but the radius of curvature around the Y-axis deflection reduced, performance has slightly dropped, from IV Curve that the radius of curvature smaller fiber bundles and electrode contact resistance also increases, but this performance decline in the acceptable range. This will be a torsion-type fuel cell, can be the radius of curvature 45.5 ~ 10.58cm or less within the flexural performance, this battery has the potential of portable fuel cells, advantages of low pollution, high efficiency and easy to carry.

Thesis--M. Sc., University of Hong Kong, 1982.

No description available.

This thesis is a study of the occupational group consisting of the independent trash collectors in Center Township of Delaware County, Indiana. It represents an attempt to discover who the individuals are who comprise this group and what characteristics they have as trash collectors.This thesis explores the attitudes of the independent collectors toward the public, their attitudes regarding the public’s conception of them, and the collectors’ attitudes toward their work. The views these men hold regarding their future and the future of their business are also examined. This thesis also discusses the equipment which the collectors own and use and surveys the present situation and future developments likely in the trash business.

Thesis (Master)--İzmir Institute of Technology, İzmir, 2006. / Keywords: Solar energy, solar collectors, solar energy systems, air heating, polyurethane foam. Includes bibliographical references (leaves.60-62).