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Title: Thermal Comfort for Passenger Train from Addis Ababa to Dire Dawa
???metadata.dc.contributor.*???: Demiss Alemu (PhD)
Dawit, Getachew
Keywords: HAP;Thermal comfort;Air conditioning
Issue Date: Oct-2014
Publisher: AAU
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 o C with RH 60% felt uncomfortable.
Appears in Collections:Railway Engineering

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