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INSTANTANEOUS THERMAL LOSS EFFICIENCY FACTOR FOR SUMMER GREENHOUSE 夏季温室瞬时热损失效率系数
International Journal of Solar Energy Pub Date : 1995-12-01 DOI: 10.1080/01425919508914305
R. Sutar, G. Tiwari
{"title":"INSTANTANEOUS THERMAL LOSS EFFICIENCY FACTOR FOR SUMMER GREENHOUSE","authors":"R. Sutar, G. Tiwari","doi":"10.1080/01425919508914305","DOIUrl":"https://doi.org/10.1080/01425919508914305","url":null,"abstract":"In this technical note, an attempt has been made to develop an analytical expression for an instantaneous thermal loss efficiency factor for a summer greenhouse. The analysis is based on energy balance equations for each component of the greenhouse in a steady state condition. Effect of design and climatic parameters have also been taken into account. An ideal condition has been achieved analytically, for a best summer greenhouse. The nature of characteristic curve obtained by the present model has been compared with the experimental results obtained by others.","PeriodicalId":162029,"journal":{"name":"International Journal of Solar Energy","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130666791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
THEORETICAL EARTH TEMPERATURE PROFILES FOR DIFFERENT SOILS AND SOIL CONDITIONS 不同土壤和土壤条件下的理论地温曲线
International Journal of Solar Energy Pub Date : 1995-11-01 DOI: 10.1080/01425919508914298
G. S. Kumar, S. Kaushik
{"title":"THEORETICAL EARTH TEMPERATURE PROFILES FOR DIFFERENT SOILS AND SOIL CONDITIONS","authors":"G. S. Kumar, S. Kaushik","doi":"10.1080/01425919508914298","DOIUrl":"https://doi.org/10.1080/01425919508914298","url":null,"abstract":"The annual temperature variations in earth with depth from the surface offers, by its natural characteristics, a phase lag and reduced variation in the maximum and minimum temperatures. The temperature profiles vary for different soils and soil conditions. Soil temperatures are found to be an explicit function of soil thermal properties, particularly the thermal diffusivity. The earth temperatures stabilize at certain depth, where the annual swings in temperature are negligible and this stabilizing depth varies for different soils. A simple first harmonic approximation method has been used to predict the temperature variations as a function of depth and time for different soils (ordinary light soil, heavy soil, organic soil and sand) and soil conditions (dry, damp and wet). The results are a helpful indicator for deciding external design temperatures for the design of earth sheltered or ground coupled spaces.","PeriodicalId":162029,"journal":{"name":"International Journal of Solar Energy","volume":"171 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117295016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
WIND DIESEL SYSTEM SIMULATION:A SCREENING LEVEL MODEL 风电柴油系统仿真:筛选级模型
International Journal of Solar Energy Pub Date : 1995-11-01 DOI: 10.1080/01425919508914300
J. Manwell, J. Mcgowan
{"title":"WIND DIESEL SYSTEM SIMULATION:A SCREENING LEVEL MODEL","authors":"J. Manwell, J. Mcgowan","doi":"10.1080/01425919508914300","DOIUrl":"https://doi.org/10.1080/01425919508914300","url":null,"abstract":"This paper describes a screening level simulation model for wind/diesel systems. It is intended for use to give a quick overview of the possible appropriateness of a wind/diesel system and indicate whether more detailed analysis would be of use. The model was developed for use on personal computers and to trade complexity for ease of operation. The wind/diesel system modeled may include: 1) Wind regime, 2) One or more wind turbines, 3) System electrical load 4) One or more diesel generators, 5) Dump load, 6) Short term storage, and 7) System controller. The model does not consider storage explicitly, but does distinguish between the no storage and minimal storage (power smoothing) systems. This work is based on the more detailed simulation models previously developed at the University of Massachusetts, but uses probabilistic methods rather than time series data inputs. As such it requires only mean and standard deviation of wind speed and load for each month or season. The model functions by assuming that...","PeriodicalId":162029,"journal":{"name":"International Journal of Solar Energy","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123842782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
COST REDUCING POTENTIAL OF PHOTOVOLTAIC CONCENTRATION 光伏聚光降低成本的潜力
International Journal of Solar Energy Pub Date : 1995-11-01 DOI: 10.1080/01425919508914297
A. Luque, G. Sala, G. Araújo, T. Bruton
{"title":"COST REDUCING POTENTIAL OF PHOTOVOLTAIC CONCENTRATION","authors":"A. Luque, G. Sala, G. Araújo, T. Bruton","doi":"10.1080/01425919508914297","DOIUrl":"https://doi.org/10.1080/01425919508914297","url":null,"abstract":"Plausible costs of photovoltaic power plants of concentration are presented. Costs are based as much as possible on the recent experience of solar thermal plants. Efficiencies, on the existing world experience of PV power plants. The result is that the costs of concentrating photovoltaic plants should be of 0.08 ECUs/ kWh, about 1/3 of that of flat module plants, and of the same order of magnitude, even lower, than those attributed to solar thermal plants of present technology. For the future, high concentration systems based on Si or tandem cells seem to be the most promising, also in the range of costs of the advanced solar thermal plants.","PeriodicalId":162029,"journal":{"name":"International Journal of Solar Energy","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115866185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Economic evaluation of solar systems 太阳能系统的经济评估
International Journal of Solar Energy Pub Date : 1995-11-01 DOI: 10.1080/01425919508914299
A. Ghoneim, M. Sorour
{"title":"Economic evaluation of solar systems","authors":"A. Ghoneim, M. Sorour","doi":"10.1080/01425919508914299","DOIUrl":"https://doi.org/10.1080/01425919508914299","url":null,"abstract":"In this investigation, the performance and economic evaluation of a solar heating and cooling system was studied using the transient simulation program (TRNSYS). The domestic water heating load, space heating load, and the cooling load of a typical Egyptian house were considered. The study involves five different localities which were chosen to represent the climatic changes all over Egypt. These localities are: Aswan (Upper Egypt), Kharga (Western Desert), Asyout (Middle Egypt), Cairo (Cairo), and Marsa Matrouh (Mediterranean).","PeriodicalId":162029,"journal":{"name":"International Journal of Solar Energy","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133710932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
INVESTIGATIONS OF FLAT PLATE COLLECTORS USING TRANSPARENT INSULATION MATERIALS 采用透明绝缘材料的平板集热器的研究
International Journal of Solar Energy Pub Date : 1995-10-01 DOI: 10.1080/01425919508914293
N. Nahar, R. Marshall, B. Brinkworth
{"title":"INVESTIGATIONS OF FLAT PLATE COLLECTORS USING TRANSPARENT INSULATION MATERIALS","authors":"N. Nahar, R. Marshall, B. Brinkworth","doi":"10.1080/01425919508914293","DOIUrl":"https://doi.org/10.1080/01425919508914293","url":null,"abstract":"Theoretical and experimental investigations have been carried out on a flat-plat collector using covers employing Transparent Insulation Material (TIM). It has been found that for a minimum front heat loss coefficient an air gap of 20 mm between the plate and the TIM and 15 mm between the TIM and the outer cover should be used. The collector performance indicates that there is no advantage in using a TIM for domestic hot water heating, but that it could usefully be employed for medium temperature applications, i. e. aboye 80°C. A value of U/rη0=3.53 W/m2K has been achieved for the flat-plate collector with 100 mm TIM encapsulated between two Teflon films and an outer Tedlar cover.","PeriodicalId":162029,"journal":{"name":"International Journal of Solar Energy","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124694633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
OPTIMIZATION OF DOMESTIC SOLAR WATER HEATING SYSTEM 家用太阳能热水系统的优化
International Journal of Solar Energy Pub Date : 1995-10-01 DOI: 10.1080/01425919508914294
A. Hasan
{"title":"OPTIMIZATION OF DOMESTIC SOLAR WATER HEATING SYSTEM","authors":"A. Hasan","doi":"10.1080/01425919508914294","DOIUrl":"https://doi.org/10.1080/01425919508914294","url":null,"abstract":"TRNSYS program was used to simulate the performance of a thermosyphon type domestic solar water heating system which is used in the West Bank. The system installation and operation parameters were optimized including collector tilt angle, the hot water storage tank volume and location relative to the collector, and the hot water consumption pattern and daily rate.","PeriodicalId":162029,"journal":{"name":"International Journal of Solar Energy","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123587974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
DESIGN STUDY OF A MULTIWICK-CUM-CONVENTIONAL SOLAR STILL-CUM-SOLAR HOT WATER SYSTEM 多芯-常规太阳能静物-太阳能热水系统的设计研究
International Journal of Solar Energy Pub Date : 1995-10-01 DOI: 10.1080/01425919508914292
Ashutosh Kumar Singh
{"title":"DESIGN STUDY OF A MULTIWICK-CUM-CONVENTIONAL SOLAR STILL-CUM-SOLAR HOT WATER SYSTEM","authors":"Ashutosh Kumar Singh","doi":"10.1080/01425919508914292","DOIUrl":"https://doi.org/10.1080/01425919508914292","url":null,"abstract":"There has been considerable effort as to the manner in which the productivity of solar stills is affected by many of the designs and operating variables. To assist in designing the stills of improved performance, design parameters involved in the operation of the system have been considered in this paper. Curves showing the magnitude of the effects of design changes on the productivity are presented. Numerical computations, which are based on energy balances of different components of this system, confirm the productivity improvement in between 23.6% to 51.2% depending on the water-flow-rate from the vertical water column on the multiwicks. This design incorporates a multiwick solar still and a conventional basin type solar still. Hot water at considerably higher than the ambient temperature may be obtained at different flow rate from this design as well.","PeriodicalId":162029,"journal":{"name":"International Journal of Solar Energy","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115605885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
THEORETICAL PERFORMANCE OF WIND WHEEL TURBINES 风轮涡轮机的理论性能
International Journal of Solar Energy Pub Date : 1995-10-01 DOI: 10.1080/01425919508914295
M. Higazy
{"title":"THEORETICAL PERFORMANCE OF WIND WHEEL TURBINES","authors":"M. Higazy","doi":"10.1080/01425919508914295","DOIUrl":"https://doi.org/10.1080/01425919508914295","url":null,"abstract":"A wind wheel turbine designed for low wind speed applications has been analytically investigated. The turbine is simple constructed from a bladed-assembly rotor directly exposed to the free wind on the upper half and exposd to the wind through a multiple ducting system on the lower half. A theoretical analysis using an engineering model based on the impulse momentum theory is described for a range of blade numbers. The computed results of the torque and power coefficients for two-, three-. and four-blade-wheels are presented. The optimum number of blades was found to be three, using the maximum power coefficient as the performance criterion. The computed values of the power coefficients are found to be higher than those associated with other wind machines for tip speed ratios up to a value of unity. The results also show that the 3-blade-wheel, with accelerating flow through the ducting system, has increased the power coefficient by 3.5 times as much as the ideal propeller type windmill. Torque coefficien...","PeriodicalId":162029,"journal":{"name":"International Journal of Solar Energy","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134149995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
RENEWABLE ENERGIES IN EUROPE : STATISTICS AND THEIR PROBLEMS 欧洲的可再生能源:统计数据及其问题
International Journal of Solar Energy Pub Date : 1995-10-01 DOI: 10.1080/01425919508914290
W. Palz
{"title":"RENEWABLE ENERGIES IN EUROPE : STATISTICS AND THEIR PROBLEMS","authors":"W. Palz","doi":"10.1080/01425919508914290","DOIUrl":"https://doi.org/10.1080/01425919508914290","url":null,"abstract":"Eurostat official figures for 1991 show that renewable energy contribution to primary production in the European Union (12) was 7% and to gross consumption 3.7%. These figures were calculated by a methodology which takes into account the actual energy content of renewable electricity from water, wind and other sources in terms of oil equivalent as for nuclear energy, a 3 times higher value is calculated by applying a Carnot conversion efficiency of 33%. In this paper, corresponding figures of 10.16% for primary production and 5.6% for gross consumption are calculated by applying equivalent Carnot efficiency of 38½ % for all non fossil electricity. With the addition of Austria, Finland and Sweden into the energy mix of the European Union, the renewable energy contribution for 1991 would have been 14.4% of.primary production and.7.8% for gross consumption.","PeriodicalId":162029,"journal":{"name":"International Journal of Solar Energy","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121001717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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