scholarly journals PERFORMANCE EVALUATION OF SOLAR COLLECTORS USING A SOLAR SIMULATOR

2015 ◽  
Vol 16 (2) ◽  
pp. 79-90 ◽  
Author(s):  
M. Norhafana ◽  
Ahmad Faris Ismail ◽  
Z. A. A. Majid
Keyword(s):  
Solar Radiation ◽  
Solar Collector ◽  
Heating System ◽  
Solar Collectors ◽  
Water Heating ◽  
Solar Simulator ◽  
Solar Water Heating ◽  
Solar Water ◽  
Useful Heat ◽  
Solar Water Heating System

Solar water heating systems is one of the applications of solar energy. One of the components of a solar water heating system is a solar collector that consists of an absorber. The performance of the solar water heating system depends on the absorber in the solar collector. In countries with unsuitable weather conditions, the indoor testing of solar collectors with the use of a solar simulator is preferred. Thus, this study is conducted to use a multilayered absorber in the solar collector of a solar water heating system as well as to evaluate the performance of the solar collector in terms of useful heat of the multilayered absorber using the multidirectional ability of a solar simulator at several values of solar radiation. It is operated at three variables of solar radiation of 400 W/m2, 550 W/m2 and 700 W/m2 and using three different positions of angles at 0º, 45º and 90º. The results show that the multilayer absorber in the solar collector is only able to best adapt at 45° of solar simulator with different values of radiation intensity. At this angle the maximum values of useful heat and temperature difference are achieved. KEYWORDS: solar water heating system; solar collector; multilayered absorber; solar simulator; solar radiation 

Performance Evaluation of a Solar Water Heating System for Industrial Application

2012 ◽  
Vol 512-515 ◽  
pp. 130-136
Author(s):  
Keh Chin Chang ◽  
Wei Min Lin ◽  
Yi Mei Liu ◽  
Tsong Sheng Lee ◽  
Kung Ming Chung
Keyword(s):  
Performance Evaluation ◽  
Heating System ◽  
Economic Viability ◽  
Solar Collectors ◽  
Water Heating ◽  
Policy Makers ◽  
Solar Water Heating ◽  
Solar Water ◽  
Solar Water Heating System

The total area of solar collectors installed in Taiwan had exceeded 2 million square meters by the end of 2010. However, there were only 98 systems in operation with area of solar collectors installed exceeding 100 square meters from 2001 to 2010. To increase industrial awareness of solar water heating technologies, a nursery greenhouse was chosen as the case study to evaluate its thermal performance throughout the months of May 2010 to April 2011. The results showed that the solar energy collected and heat loss during the night hours would affect the thermal efficiency, economic viability and attractiveness of a SWH. This study would provide useful information for all parties related to this market, manufacturers, potential users and policy-makers.

scholarly journals COMPARATIVE ANALYSIS OF A PASSIVE SYSTEM WITH AN ACTIVE WATER HEATING SYSTEM BY MEANS OF VACUUM SOLAR COLLECTOR GLASS TUBES

2016 ◽  
Vol 15 (1) ◽  
pp. 15
Author(s):  
J. D. Naranjo ◽  
C. A. Ancines ◽  
C. F. Dos Santos ◽  
A. Krenzinger
Keyword(s):  
Comparative Analysis ◽  
Solar Collector ◽  
Clean Energy ◽  
Heating System ◽  
Circulation System ◽  
Solar Collectors ◽  
Water Heating ◽  
Forced Circulation ◽  
Solar Water Heating ◽  
Solar Water

The importance of renewable energy conversion in heat generation systems is increasing. Being a form of clean energy production, solar water heating systems can substitute part of the electricity consumption in Brazilian energy matrix. Beyond the environmental benefits, the use of such systems brings economic benefits to the country and especially those who use them, saving the use of other energy sources for water heating. In Brazil, the solar water heating is carried out mainly by flat solar collectors, a widely known technology produced in the country at low prices. Nowadays another technology is being used: the evacuated solar collectors. These collectors are being worldwide produced on a large scale and they are imported and inserted at competitive prices in the domestic market. Therefore, it is necessary to understand these systems and their operation to avoid errors in their installation and optimize their use. This work accomplishes a comparative analysis of a solar water heating system composed by a water- in-glass evacuated tube solar collector working in forced circulation, varying the flow, with the same system working in thermosyphon circulation. This comparison was performed by determining the annual energy the system can produce for each type of circulation, which was calculated based on the ISO 9459-2 standard and the climatic data of Porto Alegre city, Rio Grande Do Sul State. To perform these measures, a testing bench was mounted with sensors and measuring instruments which were calibrated before use. The results show that the system with thermosyphon circulation produces more annual energy than the forced circulation system where the water temperature stratification in the thermal reservoir was lower.

Development of Optimal Design of Solar Water Heating System by Using Evolutionary Algorithm

Solar Energy ◽  
2005 ◽  
Author(s):  
K. F. Fong ◽  
T. T. Chow ◽  
V. I. Hanby
Keyword(s):  
Optimal Design ◽  
Flow Rate ◽  
Tilt Angle ◽  
Storage Capacity ◽  
Heating System ◽  
Solar Collectors ◽  
Water Heating ◽  
Solar Water Heating ◽  
Solar Water ◽  
Solar Water Heating System

There are growing initiatives to promote renewable energy in Hong Kong, particularly for solar energy. In order to encourage wider application of centralized solar water heating system for high-rise residential buildings, it is important to pursue an optimal design to get significant energy saving potential. In this regard, system optimization would be useful, as it can relate to a number of design variables of the solar water heating system such as the tilt angle and surface azimuth of the solar collectors, the storage capacity of the hot water calorifier, and the flow rate of the circulation pump set for the solar collectors. The objective function is to maximize the year-round energy saving by using the solar heating instead of conventional domestic electric heating. For the methodology of optimization, evolutionary programming, one of the paradigms of evolutionary algorithm, was applied. This has been proven to be effective for optimization problems with a non-linear and multi-dimensional nature. To generate values for the objective function, a TRNSYS plant simulation model was developed and coupled with the optimization algorithm. From the optimization results, it is suggested that the solar collectors can be installed onto the external shading devices as an integrated architectural feature, since the optimal tilt angle is 21° and relatively flat. The optimal surface azimuth is southwest 16° instead of due south. For the engineering design, both the optimal values of calorifier storage capacity and pump flow rate show that the calculations from normal design practice may not achieve an optimal performance. Therefore, an effective methodology of optimization and simulation is essential to generate an optimal design in a holistic approach.

Analysis of Thermal Performance of Solar Collector in Solar Water Heating System

2014 ◽  
Vol 1055 ◽  
pp. 193-198 ◽  
Author(s):  
Jing Zhao ◽  
Zhi Ping Wang ◽  
Ke Zhen Wang ◽  
Xin Lu
Keyword(s):  
Solar Collector ◽  
Heating System ◽  
Heat Energy ◽  
Water Heating ◽  
Flow Rates ◽  
Solar Water Heating ◽  
Solar Water ◽  
Calculation Results ◽  
Solar Water Heating System ◽  
Simplified Formula

The daily collected heat energy of solar collector in solar water heating system is calculated by the modeling of solar collector and stratified tank, and the result is verified by experiments. Through analysis of the calculation results, the simplified formula for calculating the daily collected heat energy is given. Using this simplified formula, the daily collected heat energy under different flow rates is calculated. The result shows that the daily collected heat energy of solar collector running in solar water heating system tends to stable when the flow rate above 0.005kg/(m2.s).

Hybrid Solar Lighting May Have Another Utility: Solar Water Heating

Solar Energy ◽  
2006 ◽  
Author(s):  
Peter E. Zemke ◽  
Byard D. Wood
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Optical Fibers ◽  
Heating System ◽  
Hot Water ◽  
Water Heating ◽  
Solar Water Heating ◽  
Solar Water ◽  
Solar Lighting ◽  
Solar Water Heating System

Hybrid solar lighting (HSL) has been successfully demonstrated as a means of collecting sunlight and transferring it through optical fibers into a building. The collected solar energy is primarily intended for illumination purposes. However, this technology may have an application in solar water heating. For a traditional solar water heating system, energy is required to pump the water to the roof and collected solar energy is lost to the environment through the collector and plumbing. If such a system is to be used in climates where the temperature falls below freezing, complexity is added resulting in lower system efficiencies. If, rather than pumping water to the roof to absorb solar energy, the solar radiation is “piped” into the hot water store, a solar water heating system may be much less complex and potentially more efficient. HSL technology can be used to collect solar radiation and transport it through optical fibers into a hot water store. Since the water remains in the tank, it is not exposed to freezing temperatures and heat loss through plumbing. The efficiency of the system would not be dependent on the outside temperature or the temperature of the water as traditional systems are, but solely on the efficiency in which solar radiation is transferred into the water. This paper will outline the major advantages of using HSL technology for solar water heating over traditional systems. The approximate efficiencies of a flat-plate collector, 2-axis solar tracking collector, and a system using HSL technology are compared using F-Chart for locations in the Southwestern and Northeastern United States. It is shown that improvements in efficiency are obtained using HSL technology if the system is capable of collecting and transferring the visible and infrared spectrum of solar radiation.

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