Showing 2 results for Dehghandokht
S. Sanaye, M. Dehghandokht,
Volume 1, Issue 3 (5-2011)
Abstract
Thermal modeling of an automotive cabin was performed in this paper to predict the inside cabin air temperature. To implement this task, thermal and ventilation loads were estimated and the mass and energy balance conservation equations for dry air and water vapor with considering a new parameter (air circulation ratio) as well as the balance equations of internal components of a cabin were derived and solved simultaneously. The performance of the proposed thermal modeling of a cabin was compared with the data collected from hot room experimental tests. These tests were run for various design parameters such as evaporating cooling load and cabin size (air volume inside cabin). The comparison of experimental and numerical results showed a good agreement.
Parametric analysis with three parameters namely, vehicle speed, number of passengers, and A/C air mass flow rate was performed to investigate the effects of these parameters on cabin air temperature.
S. Sanaye, M. Dehghandokht,
Volume 2, Issue 2 (4-2012)
Abstract
In this paper, mini-channel type evaporator which is new in mobile air conditioning (MAC) or automotive air
conditioning (AAC) systems is thermally modeled. The performance of mini-channel evaporator is also compared with
the laminated evaporator which is being currently used in automotive industries. The mini-channel evaporator was
constructed of two rows of parallel flow mini-channel tubes with inlet and outlet headers. The numerical results of
modeling the laminated and mini-channel evaporators validated with the corresponding experimental data which was
obtained from experiments performed on mobile air conditioning system in calorimeter test bench. The comparison of
modeling results of two evaporators showed good agreement with experimental data. The performance of laminated
and mini-channel evaporators were also compared under various operating conditions. The mini-channel evaporator
had higher cooling capacity (7.2%) and higher refrigerant pressure drop (45%) in comparison with the corresponding
values in laminated evaporator assuming the same external geometry. The outlet air temperature and enthalpy of minichannel
evaporator was also lower, 11% and 8% respectively, than that for laminated evaporator. This cause to reduce
the time period as well as power/fuel consumption for reaching the comfortable cabin temperature.
