scholarly journals Experimental Validation of a Forced-Circulation Solar Water Heating System Equipped with Flat-Plate Solar Collectors – Case Study

2020 ◽  
Vol 5 (5) ◽  
pp. 565-570
Author(s):  
Altin Maraj
Keyword(s):  
Flat Plate ◽  
Heating System ◽  
Solar Collectors ◽  
Water Heating ◽  
Forced Circulation ◽  
Solar Water Heating ◽  
Solar Water ◽  
Area Efficiency ◽  
Solar Water Heating System ◽  
Flat Plate Collector

This paper represents the comparison and the validation of results obtained from the simulation, towards the measurements performed in a forced-circulation solar water heating system equipped with flat-plate solar collectors. Polysun tool is used to model and to simulate the considered system during an annual time period. Mathematical models are used to calculate the required sensible heat, thermal yield from the flat-plate collector area, delivered energy to the thermal consumer, efficiency of the collector area, efficiency of the system, and the solar fraction. To validate the model, experimental data recorded in time intervals of 5-minutes in a trial installation are utilized. Statistical test errors (epsilon, MBE, MPE, RMSE, and R^2) are used to compare the values obtained from the simulation and measurements. Between them, a very good fit is noticed.

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.

Application Research of Solar Water Heating System in Severe Cold Region

2012 ◽  
Vol 170-173 ◽  
pp. 2499-2503
Author(s):  
Xin Chang ◽  
Jia Fu Xiao ◽  
Chun Yu Ran ◽  
Bo Jiao Yan
Keyword(s):  
Flat Plate ◽  
Heating System ◽  
Application Research ◽  
Cold Region ◽  
Water Heating ◽  
Solar Water Heating ◽  
Solar Water ◽  
Solar Water Heating System

It introduces solar water heating system briefly, states the feasibility and necessity of the application of this system in severe cold region, analyzes the advantages of flat plate solar water heating system and people’s misunderstandings and finally indicates the applicability and prospects of this system in severe cold region.

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