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.

scholarly journals Energy and Exergy Analysis of Ocean Compressed Air Energy Storage Concepts

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Vikram C. Patil ◽  
Paul I. Ro
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Heat Transfer Enhancement ◽  
Exergy Analysis ◽  
Compressed Air ◽  
Compressed Air Energy Storage ◽  
Transfer Enhancement ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Liquid Piston

Optimal utilization of renewable energy resources needs energy storage capability in integration with the electric grid. Ocean compressed air energy storage (OCAES) can provide promising large-scale energy storage. In OCAES, energy is stored in the form of compressed air under the ocean. Underwater energy storage results in a constant-pressure storage system which has potential to show high efficiency compared to constant-volume energy storage. Various OCAES concepts, namely, diabatic, adiabatic, and isothermal OCAES, are possible based on the handling of heat in the system. These OCAES concepts are assessed using energy and exergy analysis in this paper. Roundtrip efficiency of liquid piston based OCAES is also investigated using an experimental liquid piston compressor. Further, the potential of improved efficiency of liquid piston based OCAES with use of various heat transfer enhancement techniques is investigated. Results show that adiabatic OCAES shows improved efficiency over diabatic OCAES by storing thermal exergy in thermal energy storage and isothermal OCAES shows significantly higher efficiency over adiabatic and diabatic OCAES. Liquid piston based OCAES is estimated to show roundtrip efficiency of about 45% and use of heat transfer enhancement in liquid piston has potential to improve roundtrip efficiency of liquid piston based OCAES up to 62%.

scholarly journals R&D of Photovoltaic Thermal (PVT) Systems: an Overview

2018 ◽  
Vol 9 (2) ◽  
pp. 803 ◽  
Author(s):  
Ahmad Fudholi ◽  
Kamaruzzaman Sopian
Keyword(s):  
Heat Transfer ◽  
Solar Energy ◽  
Exergy Analysis ◽  
Transfer Energy ◽  
Heat Transfer Medium ◽  
Energy Modelling ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
And Performance ◽  
System Water

<span>Photovoltaic thermal (PVT), which is the popular technology for harvesting solar energy, receive solar energy and convert it into electrical and thermal energy simultaneously. In this review, design, heat transfer, energy modelling and performance analysis of PVT systems are presented. Four types of PVT systems base on heat transfer medium; air-based PVT system, water-based PVT system, the combination of water/air-based PVT system, and nanofluid-based PVT system are presented. In addition, major finding on energy and exergy analysis of PVT systems are summarized. </span>

Energy and Exergy Analysis of an Air Conditioning System Using the Mixture of Outdoor and Return Air

2012 ◽  
Author(s):  
A. Kilicarslan ◽  
I. Kurtbas
Keyword(s):  
Heat Transfer ◽  
Relative Humidity ◽  
Air Conditioning ◽  
Exergy Analysis ◽  
Computer Code ◽  
Exergy Destruction ◽  
Moist Air ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Air Conditioning Systems

Energy and exergy analysis of the air conditioning systems employing the mixture of outdoor and return air (ACOR) are presented. The equations of heat transfer rate and exergy destruction are developed for ACOR according to the system parameters of moist air and condensate water. The effects of the incoming air dry bulb temperature to the coil and relative humidity, and leaving air dry bulb temperature from the coil on the heat transfer and exergy destruction are investigated by means of a computer code developed. The heat transfer from the air to the coil increased as the incoming air dry bulb temperature and relative humidity increased while the heat transfer decreased with the increase in the leaving air dry bulb temperature. The exergy destruction of the moist air increased as the incoming air dry bulb temperature increased, but it decreased with the increasing values of incoming air relative humidity values.

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