The thermal comfort in the cabin of construction equipment has been becoming one of the important issues of cabin design. In this study, a performance index related to thermal comfort is proposed as a way to evaluate the effect of location of air-conditioning vents. As the first step, cooling performance at the position of operator in the cabin is calculated by using CFD. For more reliable analysis, the results of the simulation are compared with experimental data. The evaluation of the thermal comfort is then carried out considering the change of the location of air-conditioning vent with the same boundary conditions. Cooling performance for initial 1 minute after turn on the air-conditioning is predicted from the results of thermal comfort. All of the results are used to optimize the location of air-conditioning vent in the cabin to improve the thermal conditions for the operator.
The excavator is used in a variety of construction environments. There are many kinds of risk like falling rocks or harmful dust. The excavator cabin protects the operator not only from these harmful environments but also provides a comfortable working environment. By the way, the excavator cabin consumes a lot of energy for cabin air conditioner. For this reason, the research is required to reduce energy consumption. This study suggests the air conditioning system for excavator using forced exhaust. First, the forced exhaust system simulated by AMESim tool and surveyed the applicability. Using AMESim simulation, it was investigated the effect of cabin inside temperature by intake flow rate and intake air temperature. The experiment executed using the 1.5 ton excavator and field tested according to the intake flow rate. Finally, verified the applicability on the air conditioning system for excavator using forced exhaust.
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