Thermal Comfort for Passenger Train from Dire-Dawa to Djibouti
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Date
2015-03
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Addis Ababa University
Abstract
People spend a considerable time in vehicles; cars, trains, planes, buses or subway. This is the reason why the thermal comfort has more and more paid attention. In one hand people try to make comfort whatever they are at home, office or in car. In the other hand the thermal conditions in the cabin of vehicles and passenger compartments directly influences on the drivers and passengers safety,
Now a day the railway transport infrastructure in Ethiopia is the major issues in relation to the development of the country. To make the sector more competitive with other transportation modes it is better to design effective air conditioning system for a rail vehicle locally based on the specific working environment, so as to make passengers more comfortable. After all, passengers want to have a comfortable journey and arrive at their destination rested, so keeping train passenger compartment at a pleasant temperature is crucial.
The main objective of this thesis is designing of air conditioning system for a rail vehicle passenger compartment locally, while travelling through the route DireDawa-Djibouti.
In this paper the thermal load analysis is done in two ways; by using Analytical methods based on ASHRAE for the Design and Application of Heating, Ventilation and Air Conditioning Equipment for Rail Passenger Vehicles and by using Hourly analysis program (HAP) software.
During thermal load analysis car body conductive heat gain, solar radiation heat gain, glazing conductive heat gain, glazing solar radiation heat gain, passenger and operator cooling loads, ventilation cooling load, interior lighting heat gains, fan and fan motor heat gains, passenger door cycling air-infiltration cooling load and other miscellaneous internal heat gains have been considered. And the total cooling load using both methods HAP and Analytical methods is calculated as 74.2kw and 78.22kw respectively based on passenger compartment comfort parameters to be kept at a temperature of 23.50C and a relative humidity of 50%. And finally the suitable vehicle AC system has been designed.
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Keywords
Cooling load, Thermal comfort, Air conditioning