12,452 research outputs found

    Installation package for Sunpak solar collectors

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    A subsystem (air/liquid vacuum collector) was developed for use with solar combined heating and cooling subsystems. The collector is modular in design, is approximately twelve-feet-three-inches wide and is eight-feet-seven-inches high. The module contains 72 collector tube elements and weighs approximately 300 pounds

    Solar Distillation System Based on Multiple-Effect Diffusion Type Still

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    The present study intends to develop a high-performance solar-assisted desalination system (SADS) using multi-effect diffusion type still (MEDS) and the vacuum tube solar collector (VTSC). A MEDS prototype was designed and built. The measured result is very close to the estimation. The 10-effect MEDS will produce pure water at about 13.7 L/day/m2 collector area at a solar irradiation of 600 W/m2 and 19.7 L/day/m2 collector area at solar irradiation 800 W/m2. For 20-effect still, the yield rate increase is 32% compared to 10-effect still

    Experimental investigation of integrated energy storage on thermal performance enhancement of evacuated glass-thermal absorber tube collector (EGATC) for air heating application

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    Thermal energy storage (TES) in solar thermal application assist to increase the performance and efficiency of the solar thermal collector system. Various technique has been developed to enhance TES performance such as using water and PCM as energy storage material. Type of material selection and design arrangement also contribute to the performance of solar thermal collector. The aim of this research is to enhance the thermal performance of energy storage on Evacuated Glass-Thermal Absorber Tube Collector (EGATC) for air heating application. The performance study has been conducted to measure the outlet temperature and energy storage rates as per indoor setup under the artificial solar radiation on the effect of parameters such as inner absorber surface area air contact (perforated fins), outer absorber selective coating surface, outer absorber wall thickness, double layer non vacuum glass tube, single layer transparent outer glass tube and single layer thin film inner glass tube. The results showed that the performance of temperature outlet, energy store and energy buffer increase at wind speed 0.9 m/s, zero (0) perforated fin, non-coating outer absorber and 2mm outer absorber wall thickness. It was also demonstrated that a double layer vacuum glass tube showed a better thermal performance enhancement compared with double layer non-vacuum glass tube, single layer transparent outer glass tube and single layer thin film inner glass tube. This concluded that EGATC performance can be increase with those respective parameters

    Design of Serial Connected Vacuum Tube Solar Air Collector

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    Solar collectors are systems that convert solar energy into heat energy and transfer it to a fluid (liquid or gas). In practice, systems using for produce hot water and hot air. Solar liquid heaters aim to produce the hot water for houses and facilities (such as hotels, sports halls, etc.), while hot air generating systems are widely used for heating living spaces, heating greenhouses and drying agricultural products. Vacuum tubes are now used in liquid heated solar collectors. The thermal efficiency of the vacuum tubes is higher than the flat plate collectors. However, there is no design for the use of vacuum tubes as air heating manifolds. In this study, it was aimed to design an air heating collector using vacuum tubes. In the designed collector, vacuum tubes are connected serial. Thus, it will be ensured that air is produced at high temperature from vacuum tubes

    Modeling Heat Exchanger Performance with Application to Desalination Using a Vacuum Tubes Solar Collector

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    One goal of this project is to develop a steady state sensible performance analysis of multi-pass cross-flow finned-tube heat exchangers. The investigation considers various flow circuiting, such as counter cross-flow, parallel cross-flow, and cross-flow where the tube-side flow is in parallel. A previously developed matrix approach is used to evaluate the heat exchanger performance in each tube pass. A consistent criterion is proposed for each case, wherein increasing the NTU beyond a certain threshold value does not significantly improve heat exchanger thermal performance. Another goal of this project to devise an inexpensive, portable means of desalinating water using vacuum tubes solar collector. An evaporation/condensation process shall be employed to achieve desalination. It will incorporate an existing rooftop vacuum tube solar collector located in Lewis Hall to promote evaporation of a brine solution, and shall likewise utilize a cooling coil to condense pure water from the evaporated brine solution

    Assessment of domestic evacuated tube direct solar water heater

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    [Abstract]: This work presents the first assessment results of an evacuated tube solar collector at the Christchurch Polytechnic Institute of Technology. The assessment includes, a quantification of the capacity of heated water that could be supplied at different solar conditions and the realized energy savings (kWh), an interpretation of the working efficiency of the collector at different solar radiation and ambient temperatures. This paper presents a summary of the results achieved to date and outlines possible future developments that may be necessary to allow this type of direct solar water heater to be deployed in NZ conditions

    Experimental tests of solar collectors prototypes systems

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    Solar thermal collectors represent one of the most widely used technologies for heat production from renewable energy sources. To increase efficiency and to not increase too much cost different type of solar collectors, and in particular of evacuated tube collectors have been realized. In order to compare performance, tests at different conditions and in different configurations have to be performed. The aim of this paper is to establish the performance of a new prototype via an experimental evaluation of the performance in different conditions and configurations of three collectors. The prototype is particular owing to his new head configuration that permits an innovative parallel configuration way. Therefore, parallel and series configurations have been analyzed applying the UNI-EN 12975, in a steady-state regime. The efficiencies of the two configurations have been tested for different flow rates and different inflow water temperatures. The experimental results show that, with the same input flow rate to the single collector, the parallel configuration has higher performance than the series one, reaching 15% higher level of efficiency. Thus, it seems that these prototypes in optimized configuration can lead to a systems improvement, thereby increasing the overall energy production or giving the same energy production with smaller collector area. © 2015 Published by Elsevier Ltd
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