Thermal Comfort for Passenger Train from Addis Ababa to Dire Dawa
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Date
2014-10
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Addis Ababa University
Abstract
Air conditioning in passenger train is an effort to obtain controlled environmental conditions
in accordance with the needs of passenger comfort and the passenger does not feel cold or
hot. However, passengers will feel comfortable during the trip despite travel long distances
and ravel times. Thermal comfort for the passengers inside the carriage is influenced by
external and internal loads.
The thermal environment when the passenger train travel from Dire dawa to Addis Ababa is
hot that affect the driver's and passengers' health, performance and comfort. Due to spatial
and temporal variation of state variables and boundary conditions in the vehicle cab, the
heating, ventilating and air-conditioning (HVAC) does not have to be designed to provide a
uniform environment, especially because of individual differences regarding to physiological
and psychological.
The objective of this paper focused on the design of a passenger railway air conditioning
system through the route of Addis Ababa to Dire Dawa using Hourly Analysis program
(HAP) software for estimating the thermal loads analysis and system design ,and Analytical
method to estimate a thermal load only.
Finally, the total cooling load using both methods HAP and Analytical methods 49.9kw and
48.74kw respectively, we designed the vehicle HVAC system and select the suitable Roof
mounted package unit(RMPU) . Based on the design, conditioned the passenger compartment
temperature at 23.5
o
C with a humidity of 50% during winter or summer can feel comfortable.
When the air condition inside the car less than 23 C with RH 60% felt uncomfortable.
Description
Keywords
HAP, Thermal comfort, Air conditioning