Viability of a Eutectic–Thermoelectric Fuel Conditioning System Concept for Diesel Engines

2007 ◽  
Author(s):  
Timothy J. Schriefer ◽  
Margaret B. Bailey
Keyword(s):  
Internal Combustion Engines ◽  
Heat Storage ◽  
Electrical Energy ◽  
System Model ◽  
Cold Weather ◽  
Storage Device ◽  
Latent Heat Storage ◽  
Research Activities ◽  
Start Up ◽  
Fuel Filter

Internal combustion engines, which run on hydrocarbon fuels, experience difficulty upon engine start-up in extreme cold weather. As ambient temperature decreases below the fuel cloud point and beyond, paraffin form in the fuel and eventually clog the fuel filter. This problem becomes more pronounced when the engine in question is a Diesel and the fuel utilized is biodiesel. As an alternative fuel source, biodiesel has many advantages; however its cold weather performance is worse than even conventional diesel fuel. As biodiesel becomes more integrated into the world’s energy usage, one of the systems within a Diesel engine requiring further investigation is its fuel conditioning system. This paper describes current research aimed at the development of a fuel conditioning system that utilizes several technologies while decreasing the amount of electrical energy required for operation. The system utilizes a eutectic-thermoelectric (E-TE) combination which consists of a eutectic compound based latent heat storage device with adjacent thermoelectric elements to transfer heat from within the engine into the fuel filter, thus diminishing the amount of electrical energy typically required for the fuel conditioning process. Simulations of the E-TE system are conducted while operating within three different modes (start-up, heat storage, and electrical energy generation), while a supervisory controller distinguishes between desired operational status. The research activities and findings reported within this paper include development of a representative E-TE system model which consists of several components including a set of control laws, and a supervisory system. Model development and preliminary results for the phase one model are discussed herein.

Heat storage device for pre-heating internal combustion engines at start-up

1999 ◽  
Vol 38 (1) ◽  
pp. 98-104 ◽  
Author(s):  
Leonard L Vasiliev ◽  
Viktor S Burak ◽  
Andrei G Kulakov ◽  
Donatas A Mishkinis ◽  
Pavel V Bohan
Keyword(s):  
Internal Combustion Engines ◽  
Heat Storage ◽  
Internal Combustion ◽  
Storage Device ◽  
Combustion Engines ◽  
Start Up

Thermal Conductivity Enhancement in a Latent Heat Storage Device

2013 ◽  
Vol 860-863 ◽  
pp. 590-593
Author(s):  
Cha Xiu Guo ◽  
Ding Bao Wang ◽  
Gao Lin Hu
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Solid State ◽  
Liquid Phase ◽  
Phase Change ◽  
Latent Heat ◽  
Heat Storage ◽  
Storage Device ◽  
Latent Heat Storage ◽  
Conductivity Enhancement

High conductivity porosity materials are proposed to enhance the phase change materials (PCM) in order to solve the problem of low conductivity of PCM in the latent heat storage device (LHSD), and two-dimensional numerical simulation is conducted to predict the performance of the PCM by CFD software. During the phase change process, the PCM is heated from the solid state to the liquid phase in the process of melting and from the liquid phase to the solid state in the solidification process. The results show that porosity materials can improve heat transfer rate effectively, but the effect of heat transfer of Al foam is superior to that of graphite foam although the heat storage capacity is almost the same for both. The heat transfer is enhanced and the solidification time of PCM is decreased since the effective thermal conductivity of composite PCM is increased.

Energy Storage Start-up Strategies for Concentrated Solar Power Plants With a Dual-Media Thermal Storage System

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Ben Xu ◽  
Peiwen Li ◽  
Cho Lik Chan
Keyword(s):  
Energy Storage ◽  
Storage Tank ◽  
Heat Storage ◽  
Storage System ◽  
Electrical Energy ◽  
Thermal Storage ◽  
Energy Output ◽  
Concentrated Solar Power ◽  
Start Up ◽  
Hot Start

A concentrated solar power (CSP) plant typically has thermal energy storage (TES), which offers advantages of extended operation and power dispatch. Using dual-media, TES can be cost-effective because of the reduced use of heat transfer fluid (HTF), usually an expensive material. The focus of this paper is on the effect of a start-up period thermal storage strategy to the cumulative electrical energy output of a CSP plant. Two strategies—starting with a cold storage tank (referred to as “cold start”) and starting with a fully charged storage tank (referred to as “hot start”)—were investigated with regards to their effects on electrical energy production in the same period of operation. An enthalpy-based 1D transient model for energy storage and temperature variation in solid filler material and HTF was applied for both the sensible heat storage system (SHSS) and the latent heat storage system (LHSS). The analysis was conducted for a CSP plant with an electrical power output of 60 MWe. It was found that the cold start is beneficial for both the SHSS and LHSS systems due to the overall larger electrical energy output over the same number of days compared to that of the hot start. The results are expected to be helpful for planning the start-up operation of a CSP plant with a dual-media thermal storage system.

scholarly journals Analysis of Heat Transfer and Natural Convective of a Phase Change Material

2021 ◽  
Vol 9 (VII) ◽  
pp. 3028-3037
Author(s):  
T. Ravi Kumar
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Phase Change Material ◽  
Latent Heat ◽  
Heat Storage ◽  
Storage Device ◽  
Latent Heat Storage ◽  
Recovery System ◽  
Solid Liquid ◽  
Change Material

A phase-change material (PCM) is a substance with a high latent heat storage capacity which on melting and solidifying at a certain temperature, is capable of storing and releasing large amounts of energy. Various PCM like Paraffin wax, stearic acid are considered which are used to absorb heat from the coolant water from the engine. The conduction and convection criterion of heat transfer enable the PCM to store this heat as latent heat. The amount of convection and temperature change brought about due to the heat flux has been simulated and studied in detail using FLUENT. The thermal energy storage device (TESD) works on the effect of absorption and rejection of heat during the solid-liquid phase change of heat storage material. The overall function of the TESS is dominated by the PCM. The PCM material should be selected considering the application and the working conditions. Depending on the applications, the PCMs should first be selected based on their melting temperature for heat recovery system.

scholarly journals Experimental Work on Cold Starting Emission of CI Engine using Engine Waste Heat Energy

2020 ◽  
Vol 9 (3) ◽  
pp. 3708-3712
Keyword(s):  
Internal Combustion Engines ◽  
Waste Heat ◽  
Direct Injection ◽  
Cooling Water ◽  
Weather Conditions ◽  
Cold Weather ◽  
Storage Device ◽  
Emission Analysis ◽  
Cold Starting ◽  
Smoke Opacity

In the present day, emission by internal combustion engines causes several problems like acid rain, depletion of ozone layer, and global warming for which it has become a prior concern. The hazards further increases during cold weather conditions. In this paper, emission analysis has been carried out using single cylinder, 4 stroke, direct injection and water cooled variable compression ratio diesel engine. A thermal energy storage device (TESD) containing phase changing material (PCM) has been designed and tested for storing the waste energy of cooling water from engine and reutilizing it for pre-heating. The working principle of TESD is based upon the principle of absorbing and rejecting heat during phase change of PCM material. The test condition is 15° C and 1 atm pressure at which, the experiments are carried out using TESD. A significant reduction in CO (23.72%), HC (2.03%) and smoke opacity (6.05%) after 900secs and an increase in engine temperature upto 61ºC after 840secs of engine running is observed.

Latent Heat Storage for Solar Steam Systems

2007 ◽  
Vol 130 (1) ◽  
Author(s):  
Wolf-Dieter Steinmann ◽  
Rainer Tamme
Keyword(s):  
Latent Heat ◽  
Power Plants ◽  
Phase Change Materials ◽  
Heat Storage ◽  
Storage Systems ◽  
Storage System ◽  
Saturation Temperature ◽  
Steam Generation ◽  
Latent Heat Storage ◽  
Research Activities

Solar thermal systems, including direct steam generation in the absorbers, require isothermal energy storage systems. One option to fulfil this requirement is the application of phase change materials (PCMs) to absorb or release energy. The implementation of cost-effective storage systems demands the compensation of the low thermal heat conductivity that is characteristic for the candidate materials for PCM. Solar steam generation for power plants requires latent heat storage systems for a saturation temperature range between 200°C and 320°C. This paper describes the basic concepts investigated and first results of research activities aiming at the demonstration of a storage system using steam provided by parabolic trough collectors.

Improvements in Heater, Defroster and Emissions Performances Using a Latent Heat Storage Device

1994 ◽  
Author(s):  
Anestis P. Tsantis ◽  
J. Steven Brown ◽  
Robert J. Hutter ◽  
Peter M. Lyon ◽  
T. Singh
Keyword(s):  
Latent Heat ◽  
Heat Storage ◽  
Storage Device ◽  
Latent Heat Storage
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