Evaluation and Improvement of an Unsteady Heat Transfer Model for Spark Ignition Engines

1991 ◽  
Author(s):  
P. Puzinauskas ◽  
C. Borgnakke
Keyword(s):  
Heat Transfer ◽  
Spark Ignition ◽  
Heat Transfer Model ◽  
Transfer Model ◽  
Spark Ignition Engines ◽  
Unsteady Heat Transfer

Heat transfer model for small-scale spark-ignition engines

2009 ◽  
Vol 52 (7-8) ◽  
pp. 1875-1886 ◽  
Author(s):  
Yuh-Yih Wu ◽  
Bo-Chiuan Chen ◽  
Feng-Chi Hsieh ◽  
Cheng-Ting Ke
Keyword(s):  
Heat Transfer ◽  
Spark Ignition ◽  
Heat Transfer Model ◽  
Small Scale ◽  
Transfer Model ◽  
Spark Ignition Engines

scholarly journals Optimization of heat saving in buildings using unsteady heat transfer model

2015 ◽  
Vol 19 (3) ◽  
pp. 881-892 ◽  
Author(s):  
Aleksandra Dedinec ◽  
Aleksandar Dedinec ◽  
Natasa Markovska
Keyword(s):  
Heat Transfer ◽  
Energy Consumption ◽  
Meteorological Data ◽  
Cost Effective ◽  
Heat Transfer Model ◽  
Transfer Model ◽  
Effective Energy ◽  
Air Conditioner ◽  
Unsteady Heat Transfer ◽  
Heating Technology

Reducing the energy consumption growth rate is increasingly becoming one of the main challenges for ensuring sustainable development, particularly in the buildings as the largest end-use sector in many countries. Along this line, the aim of this paper is to analyse the possibilities for energy savings in the construction of new buildings and reconstruction of the existing ones developing a tool that, in terms of the available heating technologies and insulation, provides answer to the problem of optimal cost effective energy consumption. The tool is composed of an unsteady heat transfer model which is incorporated into a cost-effective energy saving optimization. The unsteady heat transfer model uses annual hourly meteorological data, chosen as typical for the last ten-year period, as well as thermo physical features of the layers of the building walls. The model is tested for the typical conditions in the city of Skopje, Macedonia. The results show that the most cost effective heating technology for the given conditions is the wood fired stove, followed by the inverter air-conditioner. The centralized district heating and the pellet fired stoves are the next options. The least cost effective option is the panel that uses electricity. In this paper, the optimal insulation thickness is presented for each type of heating technology.

Theoretical Post-Dryout Heat Transfer Model

2018 ◽  
Vol 1 (1) ◽  
pp. 142-150
Author(s):  
Murat Tunc ◽  
Ayse Nur Esen ◽  
Doruk Sen ◽  
Ahmet Karakas
Keyword(s):  
Heat Transfer ◽  
Droplet Diameter ◽  
Heat Transfer Model ◽  
Transfer Model ◽  
Operating Pressure ◽  
Vertical Pipe ◽  
Two Phase ◽  
Experimental Values ◽  
Reactor Operating ◽  
Coolant System

A theoretical post-dryout heat transfer model is developed for two-phase dispersed flow, one-dimensional vertical pipe in a post-CHF regime. Because of the presence of average droplet diameter lower bound in a two-phase sparse flow. Droplet diameter is also calculated. Obtained results are compared with experimental values. Experimental data is used two-phase flow steam-water in VVER-1200, reactor coolant system, reactor operating pressure is 16.2 MPa. On heater rod surface, dryout was detected as a result of jumping increase of the heater rod surface temperature. Results obtained display lower droplet dimensions than the experimentally obtained values.

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