Papers by Keyword: Solar Collector

Abstract: This article deals with the modelling of a small domestic solar collector array using Transient System Simulation Tool. The model was developed using meteorological data included as part of the Transient System Simulation Tool , mean regional data and actual meteorological data collected near the site of the solar array during testing. The main aim of this study was to compare the results of model simulations using the different types of meteorological data. The most accurate simulation was that prepared using meteorological data collected near the site of the solar array. Even here, however, differences were observed due to the equipment used to monitor heat gain, that is earlier insolation of the meteorological station.

Abstract: The subject of the paper is to calculate the energy performance of building in proposed variants. The differences in the variants are in the using of conventional and renewable sources for heating and domestic hot water system. Target of the second part of paper is to know, how much money we need to invest into the proposed variants for heating and domestic hot water systems and how much money will by the user paying for operating costs. The conclusion of the paper describes the payback periods of proposed variants.

Abstract: The objective of the present study is to investigate the performance of solar collector with serpentine shape of heat pipe and water-ethanol as a working fluid. Serpentine shape is easy of manufacturing and also to reduce cost of manufacturing. In this work, heat pipe is made from copper tube having ID 10mm and OD 12mm.The tube is bent in serpentine manner and filled with Water-ethanol as a working fluid with 70% filling ratio. The length of evaporator, adiabatic and condenser section was 480mm, 50mm and 65mm respectively. The test is conducted for coolant flow rate 4.5 kg/hr different angle of collector 20°, 31.5°, 40°, 50°, 60°. Result shows that water-ethanol collector gives better performance than collector with water as a working fluid. Maximum efficiency is observed at 31.5° inclination.

Abstract: The building environment and the building roof structure of buildings are different from each other. This causes the different combination methods of solar collectors and building roof. The outlook of solar collectors and the methods of waterproof and insulation are various. These factors will contribute to the diversification of forms of solar water heaters. This paper describes several combination methods of solar collectors and building roof and the corresponding waterproof and insulation methods. Based on existing combination methods and in the premise to ensure the safety and functionality, a more simple and economical combination method was put forward - combination structure of industrial aluminum and its accessories. It can meet the requirements of the industrialization of constructional installation and building integrate in our social.

Abstract: The energy demand of buildings represents in the balance of heat use and heat consumption of energy complex in the Slovak national economy second largest savings potential. Their complex energy demands is the sum of total investment input to ensure thermal protection and annual operational demands of particular energy systems during their lifetime in building. The application of energy systems based on thermal solar systems reduces energy consumption and operating costs of building for support heating and domestic hot water as well as savings of non-renewable fossil fuels. Correctly designed solar energy system depends on many characteristics, i. e. appropriate solar collector area and tank volume, collector tilt and orientation as well as quality of used components. The evaluation of thermal solar system components by calculation software shows how can be the original thermal solar system improved by means of performance. The system performance can be improved of more than 31 % than in given system by changing four thermal solar system parameters such as heat loss coefficient and aperture area of used solar collector, storage tank volume and its height and diameter ratio.

Abstract: To increase the efficiency of solar energy, a method for setting the collector was established, which can enhance the solar thermal power in winter. The optimum angles of the quasi-fixed solar collector and fixed solar collector were calculated. For Daqing area, their values were given, the angle is 4945.51for quasi-fixed solar collector and it is 5355.97 for fixed solar collector. Comparing the quasi-fixed solar collector with fixed solar collector in Daqing area, the better choice is the quasi-fixed solar collector.

Abstract: A solar air heater (SAH) is a simple heater using solar radiation that is useful for drying or space heating. Unfortunately, heat transfer from the absorber plate to the air inside the solar air heater is low. Some researchers reported that obstacles are able to improve the heat transfer in a flat plate solar air collector and others found that a v-corrugated absorber plate gives better heat transfer than a flat plate. Yet, no work of combining these two findings is found.This paper describes the result of experimental study on a SAH with v-corrugated absorber plate and obstacles bent vertically started from 80^o to 0^o with interval 10^o on its bottom plate. Experiments were conducted indoor at five different Reynolds numbers (1447 Re 7237) and three different radiation intensities (430, 573, and 716 W/m²).It is found that the obstacles improve SAH performance. Both the air temperature rise and efficiency increase with inserting obstacles bent at any angle vertically. Unfortunately, the air pressure drop is increasing, too. Obstacles bent vertically at smaller angle (means more straight) give higher air temperature rise and efficiency. However, the optimum angle is found 30^o. The air temperature rise and efficiency will be 5.3% lower when the obstacles bent 30^o instead of 0^o, but the pressure drop will be 17.2% lower.

Abstract: This paper constructed a new type of solar photovoltaic and solar heat coupling water source heat pump heating system, the composition of the system structure and operation mode is introduced, with the result of the experiment, parameters were analyzed, and successfully solves the solar panel and battery temperature is high, the problem of low efficiency, the system is a kind of close to zero energy consumption, pollution-free and efficient energy utilization system. Is suitable for the application of the climate condition in qinhuangdao.

Abstract: The Efficiency of Energy and Exergy is Generally Used as the Mostimportant Parameter in Order to Introduce and Compare the Thermal Systems Offlat Plate Solar Collectors. the First Law of Thermodynamics is Not Solelycapable of Demonstrating Quantitative and Qualitative Performance of Suchsystems, so the Second Law is Required to Illustrate the Performances. in Thispaper, an Analysis was Done for Heat Transfer Performance and Exergy Efficiencyof Flat Plate Solar Collectors Using Four Types of Nanofluids, e.g. Zno/water,CeO₂/water, Nio and Coo/water. these Nanofluids were Used Withdifferent Nanoparticle Volume Fractions in the Range of 1% to 4%. Besides this,the Present Work also Focuses on the Performance of Solar Collector Withdifferent Volume Flow Rates. Investigation Consequences are also Compared Withthe Presently Available Literature for Conventional Solar Collectors. Thehighest Heat Transfer Performance and Exergy Efficiency were Obtained for CeO₂/waternanofluid among all Nanofluids. Nio/water and Coo/water Nanofluids Representalmost same Performance but Higher than Water. the Results Reveal that, CeO₂/waternanofluid Indicates Maximum Heat Transfer with Maximum Exergy.

Abstract: One dimensional steady state mathematical model has been developed for study the thermal behavior of two types of flat-plate solar air heating collectors. The model allows demonstration the influence of the collector's dimension leading to optimize the length of the collector. The model implemented numerically using finite-difference technique with mass flow rate of 0.01 kg/s per unit area of solar collector and the incident solar radiation equal to 900W/m². The analysis has been done for a large range of areas. Illustrative results such as the temperatures of the components of the collectors (glass cover, absorber plate, air flowing through the collector and the rear plate), efficiency and useful heat extracted from the collector are graphically presented. The obtained results from both the energetic and economic analysis showed that, for the first type of the flat-plate solar air heating collector, the optimum length is 4.05 meters, moreover, it dawdles its energy collected past for lengths greater than 6 meters. There is no optimum length for the second type, but there is no much energy gain for lengths greater than 6 meters anyhow, the economic analysis showed that the length must be greater than 2.5 meters for both types of collectors.