scholarly journals Optimization of the Parameters of Solar Water Heating System

2006 ◽  
Vol 1 ◽  
pp. 353
Author(s):  
U. Iljins ◽  
I. Ziemelis ◽  
H. Putāns ◽  
A. Šķēle ◽  
J. Navickas
Keyword(s):  
Heat Transfer ◽  
Solar Collector ◽  
Heating System ◽  
Heat Transfer Equation ◽  
Laboratory Equipment ◽  
Solar Water Heating ◽  
Materials Used ◽  
Flat Plate Solar Collector ◽  
Solar Water Heating System ◽  
The Mathematical Model

In order to investigate the possibility to increase the efficiency of a flat-plate solar collector the mathematical model of the collector has been worked out. By solving the Laplace heat transfer equation at the boundary conditions accordingly to the construction of the collector, the obtained solution gives possibility to simulate on a computer the construction of the collector in dependence on physical, thermal and economic values of materials used for the construction. The computed results by theoretical formulas with experimental results obtained on special laboratory equipment have been compared and good concurrence acquired.

Improved Model for Calculating Instantaneous Efficiency of Flat-Plate Solar Thermal Collector

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Oussama Ibrahim ◽  
Farouk Fardoun ◽  
Rafic Younes ◽  
Mohamad Ibrahim
Keyword(s):  
Steady State ◽  
Flat Plate ◽  
Case Studies ◽  
Solar Collector ◽  
Heating System ◽  
Solar Water Heating ◽  
Solar Water ◽  
Flat Plate Solar Collector ◽  
Definition Of ◽  
Solar Water Heating System

The performance of a flat-plate solar collector is usually assessed by its efficiency. This efficiency is normally defined on a steady-state basis, which makes it difficult to correctly track the instantaneous performance of the collector in various case-studies. Accordingly, this paper proposes an improved definition of instantaneous efficiency of a flat-plate solar collector used as a part of a solar water heating system. Using a predeveloped model by the authors for such a system, the proposed efficiency-definition is examined and compared with the conventional one for specific case studies. The results show that the improved definition of efficiency records reasonable values, i.e., no over-range values are observed contrast to the case of conventional efficiency-definition. Furthermore, this suggested efficiency approximately coincides with the conventional one at a wide range of time, as long as the system is operating in the so-called trans-steady-state phase or when the system is off-operational provided that the instantaneous rate of heat stored in the heat transfer fluid (HTF) is less than or equal to zero. As a result, the improved efficiency-definition yields more realistic results in reflecting the performance of a flat-plate collector in an active solar water heating system and is recommended to be used.

scholarly journals Design, Developing and Construction of an Educational Solar Water Heating System with Phase Change

2015 ◽  
Vol 10 (1) ◽  
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Solar Collector ◽  
Heat Storage ◽  
Heating System ◽  
Storage Unit ◽  
Solar Water Heating ◽  
Solar Water ◽  
Solar Water Heating System ◽  
Change Material

An educational solar water heater with phase change material (PCM) was designed, developed, and constructed for instructional and demonstrative purposes. This interactive solar water heating system experimental apparatus is capable of demonstrating thermal energy storage and heat transfer concepts and principles. The system consists of two simultaneously functioning heat absorbing units. The first is a flat plate solar collector and the other is a heat storage unit consisting of phase change material (paraffin wax). The heat storage unit utilizes small aluminium cylinders (heat exchangers) filled with paraffin wax as the heat storage medium. Water pump is used to circulate the water between the solar collector and the storage unit where the PCM is located. Results indicate that the PCM stored energy, as latent heat, that was absorbed by the solar collector and released to heat the water in the storage tank when half of the hot water was replaced with cold water. Moreover, tests indicated that latent heat storage is more effective than sensible.

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).

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