A review on parabolic trough/Fresnel based photovoltaic thermal systems

Atabi

2019

Self Cite

In this research, a genetic algorithm has been used to optimize the focal area of the parabolic trough concentration photovoltaic/thermal. First, based on the physical and thermodynamic variables, the system modeling was performed; then, by changing the variables were calculated the effect of these parameters on the electrical and thermal efficiencies. In the next step, the optimization was conducted by the mentioned algorithms. The objective function consists of two targets of electrical efficiency combined with thermal efficiency. The optimization variables include the length of the system, the pipe diameter, the collector diameter, mass flow rate, and the photovoltaic cell width. After running the program in the normal mode, the highest electrical and thermal efficiencies were 0.2063 and 0.4473 for the length of 10 m, the collector diameter of 1.2 m, the flow rate of 0.15 kg/s, the pipe diameter of 0.03 m, and the photovoltaic cell width of 0.02 m. According to the genetic algorithm, the optimal answer for the total efficiency of this system is 0.84737.

Section: Martials and Methodsmentioning

confidence: 99%

“…23,24 By using these systems, the cost of power output of the solar cells would be reduced. [25][26][27] The schematic is presented in Figure 1.…”

Section: Parabolic Trough Cpvt Systemmentioning

confidence: 99%

Optical modeling and optimization of parabolic trough concentration photovoltaic/thermal system

Alayi

Atabi

2019

Self Cite

“…Renewable energy is free, clean, and free from environmental degradation that has long been used in many ways. Replacing fossil fuels with clean energy to reduce and save energy, Control over supply and demand of energy and reducing pollution emissions is welcomed . Figure , the energy consumption in different parts of Iran, shows the highest percentage of the building sector.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the operation and development of combined heat and power (CHP) systems based on photovoltaic cells is a good solution. Meanwhile, given that the cost of energy per unit of production in systems based on parabolic trough concentrating PV/thermal requires less space than other systems, then this system is used to supply the load of the building .…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of parabolic trough concentration photovoltaic/thermal system for using in buildings

Alayi

Atabi

2019

Self Cite

In this research, a parabolic trough concentrating photovoltaic thermal (CPVT) was used to provide the energy needed for a residential building. In order to do this, the required amount of heating and cooling and electrical energy was first obtained using Carrier software, then the electrical demand was obtained according to the standard model and governing relations. In the next step, the CPVT as a source of heat and cooling, and electrical energy for the building, was simulated in TRNSYS software. In order to achieve the highest reliability in terms of heat supply and reduction of thermal losses in the whole system, phase‐change material was used as a heat storage source. Mehrabad (Tehran) was considered as the target area in simulation. For this area the highest radiation intensity is 7.79 kWh/m2·day, which shows the potential of the region. The simulation results of the studied system showed that the highest output temperature and solar fraction for total load in building from CPVT was 150°C and 0.0.2926. © 2019 American Institute of Chemical Engineers Environ Prog, 38: e13220, 2019

“…The renewable energies have drawn a considerable attention in the worldwide communities as an approach to a sustainable development . The growing energy demand in the modern society is the main reason for the fast developments in renewable energy technologies . On the other hand, the global concerns over the recent climate changes are powerful motivations for the advancement of the renewable energies .…”

Section: Introductionmentioning

confidence: 99%

A Detailed Investigation of the Walls Shading Effect on the Performance of Solar Ponds

Aramesh

Pourfayaz

et al. 2018

Self Cite

In this article, a general modification on the existing heat storage modeling methods of solar ponds is presented. For this purpose, the walls shading effects have been thoroughly investigated. Four common structural types of the solar pond are studied and proper relations have been derived for them. Considering all the effective parameters on the walls shading status, precise relations for calculation of the sunny area at any desired time and location were presented. To compare different configurations, all the four types are studied in two design sets; ponds with the same top surface area of 12.56 m2, and ponds with the same total volume of 18 m3. It was indicated that the derived formulas can reduce the pond temperature calculation uncertainty from 8% (in the case of neglecting the shading effects) to less than 3%. Also, it was concluded that in the same total volume, the ponds with sloped walls show a better thermal performance. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13014, 2019