scholarly journals Heat transfer and efficiency of dual channel PVT air collector: a review

2019 ◽  
Vol 10 (4) ◽  
pp. 2037
Author(s):  
Ahmad Fudholi ◽  
Muhammad Zohri ◽  
Ivan Taslim ◽  
Fitrotun Aliyah ◽  
Arthur Gani Koto
Keyword(s):  
Heat Transfer ◽  
Mathematical Models ◽  
Thermal Energy ◽  
Environment Friendly ◽  
One Dimensional ◽  
Dual Channel ◽  
Pv Panel ◽  
System A ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis

Solar energy is free, renewable and environment friendly and has been widely used in electricity generation and thermal energy through photovoltaic thermal (PVT) system. A PVT collector is a combination of a PV panel and a thermal collector in a single unit to simultaneously generate electricity and thermal energy. In this review, mathematical models for dual channel PVT air collectors is presented. This review presents various research and development, as well as heat transfer and thermal modelling of dual channel PVT air collectors. Moreover, various mathematical models that evaluate the performances base on energy and exergy analysis of dual channel PVT air collectors are presented. Energy balance is the basic concept in developing the mathematical models. Generally, steady-state one-dimensional linear first-order differential equations were reported for solution of mathematical model. Energy and exergy efficiencies of dual channel PVT air collectors were 22.5%–67% and 3.9%-58%, respectively.

scholarly journals Efficiency and energy modelling for PVT air collector with extended heat transfer area: a review

2019 ◽  
Vol 10 (4) ◽  
pp. 2029
Author(s):  
Ahmad Fudholi ◽  
Mariyam Fazleena Musthafa ◽  
Ivan Taslim ◽  
Merita Ayu Indrianti ◽  
Intan Noviantari Manyoe ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Energy ◽  
Thermal Efficiency ◽  
Electricity Generation ◽  
Maximum Energy ◽  
Heat Transfer Area ◽  
Environment Friendly ◽  
Collector System ◽  
Pv Panel ◽  
Energy Modelling

Solar energy is renewable and environment friendly and has been widely used in electricity generation and thermal energy through photovoltaic thermal (PVT) system. This system is beneficial in terms of maximum energy generation and cost of usage. The growing concern on energy sources and their usage has increased the significance and demand for PVT collectors. A PVT air collector consists of a PV panel and a thermal collector system. In PVT air collector, electricity and thermal energy are generated simultaneously. This review focuses on efficiency and energy modelling for PVT air collector with extended heat transfer area. Findings of this review indicated that PVT air collector with extended heat transfer area produced PVT efficiency higher than conventional PVT air collector. The thermal efficiency of PVT air collector for with and without extended heat transfer area are 21-83% and 12-70%, respectively, which the improvement of thermal efficiency is 15.7-42.8%.

scholarly journals Performance analysis of a novel integrated photovoltaic–thermal system by top-surface forced circulation of water

Clean Energy ◽  
2020 ◽  
Author(s):  
Md Arman Arefin ◽  
Mohammad Towhidul Islam ◽  
Mohammad Zunaed ◽  
Khodadad Mostakim
Keyword(s):  
No Value ◽  
Forced Circulation ◽  
Pv Panel ◽  
Photovoltaic Thermal System ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Mass Flow Rates ◽  
Overall Efficiency ◽  
The Individual ◽  
Over The Top

Abstract Almost 80–90% of energy is wasted as heat (provides no value) in a photovoltaic (PV) panel. An integrated photovoltaic–thermal (PVT) system can utilize this energy and produce electricity simultaneously. In this research, through energy and exergy analysis, a novel design and methodology of a PVT system are studied and validated. Unlike the common methods, here the collector is located outside the PV panel and connected with pipes. Water passes over the top of the panel and then is forced to the collector by a pump. The effects of different water-mass flow rates on the PV panel and collector, individual and overall efficiency, mass loss, exergetic efficiency are examined experimentally. Results show that the overall efficiency of the system is around five times higher than the individual PV-panel efficiency. The forced circulation of water dropped the panel temperature and increased the panel efficiency by 0.8–1% and exergy by 0.6–1%, where the overall energy efficiency was ~81%.

scholarly journals Energy and Exergy Analysis of Sensible Thermal Energy Storage—Hot Water Tank for a Large CHP Plant in Poland

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4842 ◽  
Author(s):  
Ryszard Zwierzchowski ◽  
Marcin Wołowicz
Keyword(s):  
Energy Storage ◽  
Ambient Temperature ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Exergy Analysis ◽  
Hot Water ◽  
Water Tank ◽  
Exergy Destruction ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis

The paper contains a simplified energy and exergy analysis of pumps and pipelines system integrated with Thermal Energy Storage (TES). The analysis was performed for a combined heat and power plant (CHP) supplying heat to the District Heating System (DHS). The energy and exergy efficiency for the Block Part of the Siekierki CHP Plant in Warsaw was estimated. CHP Plant Siekierki is the largest CHP plant in Poland and the second largest in Europe. The energy and exergy analysis was executed for the three different values of ambient temperature. It is according to operation of the plant in different seasons: winter season (the lowest ambient temperature Tex = −20 °C, i.e., design point conditions), the intermediate season (average ambient temperature Tex = 1 °C), and summer (average ambient temperature Tex = 15 °C). The presented results of the analysis make it possible to identify the places of the greatest exergy destruction in the pumps and pipelines system with TES, and thus give the opportunity to take necessary improvement actions. Detailed results of the energy-exergy analysis show that both the energy consumption and the rate of exergy destruction in relation to the operation of the pumps and pipelines system of the CHP plant with TES for the tank charging and discharging processes are low.

Overall thermal energy and exergy analysis of hybrid photovoltaic thermal array

Solar Energy ◽  
2012 ◽  
Vol 86 (5) ◽  
pp. 1531-1538 ◽  
Author(s):  
C.S. Rajoria ◽  
Sanjay Agrawal ◽  
G.N. Tiwari
Keyword(s):  
Thermal Energy ◽  
Exergy Analysis ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis

Exergy-Based Optimization of Sub- and Supercritical Thermal Energy Storage Systems

2014 ◽  
Author(s):  
Louis A. Tse ◽  
Reza Baghaei Lakeh ◽  
Richard E. Wirz ◽  
Adrienne S. Lavine
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Storage System ◽  
Heat Transfer Fluid ◽  
Energy And Exergy

In this work, energy and exergy analyses are applied to a thermal energy storage system employing a storage medium in the two-phase or supercritical regime. First, a numerical model is developed to investigate the transient thermodynamic and heat transfer characteristics of the storage system by coupling conservation of energy with an equation of state to model the spatial and temporal variations in fluid properties during the entire working cycle of the TES tank. Second, parametric studies are conducted to determine the impact of key variables (such as heat transfer fluid mass flow rate and maximum storage temperature) on both energy and exergy efficiencies. The optimum heat transfer fluid mass flow rate during charging must balance exergy destroyed due to heat transfer and exergy destroyed due to pressure losses, which have competing effects. Similarly, the optimum maximum storage fluid temperature is evaluated to optimize exergetic efficiency. By incorporating exergy-based optimization alongside traditional energy analyses, the results of this study evaluate the optimal values for key parameters in the design and operation of TES systems, as well as highlight opportunities to minimize thermodynamic losses.

Energy and Exergy Analysis of a Photovoltaic-Thermal Collector With Natural Air Flow

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
A. Shahsavar ◽  
M. Ameri ◽  
M. Gholampour
Keyword(s):  
Geographic Location ◽  
Metal Sheet ◽  
Heat Extraction ◽  
Cell Efficiency ◽  
System A ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Thin Metal Sheet ◽  
Exergy Performance ◽  
Good Agreement

The objective of present work is to analyze the energy and the exergy performance of a naturally ventilated photovoltaic-thermal (PV/T) air collector which is designed, manufactured and tested at a geographic location of Kerman, Iran. This PV/T collector is tested in both glazed and unglazed types. In this system, a thin metal sheet is used to improve heat extraction from the PV panels and consequently achieving higher thermal and electrical output. The metal sheet is suspended at the middle of an air channel in the studied PV/T air configuration. A theoretical model is developed and validated against experimental data, where good agreement between the predicted results and measured data is achieved. The validated model is then used to study the effect of the solar radiation, channel depth, collector length, and PV cell efficiency on total energy and exergy efficiency of the studied system.

scholarly journals Experimental Energy and Exergy Analysis of an Automotive Turbocharger Using a Novel Power-Based Approach

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6572
Author(s):  
Sina Kazemi Bakhshmand ◽  
Ly Tai Luu ◽  
Clemens Biet
Keyword(s):  
Heat Transfer ◽  
Exergy Analysis ◽  
Test Bench ◽  
Deep Understanding ◽  
Experimental Measurements ◽  
First Law Of Thermodynamics ◽  
Hot Gas ◽  
Energy And Exergy ◽  
Laws Of Thermodynamics ◽  
Energy And Exergy Analysis

The performance of turbochargers is heavily influenced by heat transfer. Conventional investigations are commonly performed under adiabatic assumptions and are based on the first law of thermodynamics, which is insufficient for perceiving the aerothermodynamic performance of turbochargers. This study aims to experimentally investigate the non-adiabatic performance of an automotive turbocharger turbine through energy and exergy analysis, considering heat transfer impacts. It is achieved based on experimental measurements and by implementing a novel innovative power-based approach to extract the amount of heat transfer. The turbocharger is measured on a hot gas test bench in both diabatic and adiabatic conditions. Consequently, by carrying out energy and exergy balances, the amount of lost available work due to heat transfer and internal irreversibilities within the turbine is quantified. The study allows researchers to achieve a deep understanding of the impacts of heat transfer on the aerothermodynamic performance of turbochargers, considering both the first and second laws of thermodynamics.

Sign in / Sign up

Export Citation Format

Share Document