Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.
This study mainly focuses on experimental investigation of
ceiling-slot ventilated enclosures for determining the airflow
and thermal characteristics. The experimental prototype has the
dimensions of 8.33 m (length) x 2.50 m (height) x 2.46 m
(width) and the cooled air is injected into the container through
a half-width slot positioned at the centre of front surface and
close to the ceiling. The prototype is positioned inside of a
climatic test chamber having dimensions of 14 m (length) x 5 m
(width) x 6.5 m (height). The temperature and the relative
humidity of the test chamber may be varied within limits of (-
20°C and +50°C), and (5% and 95%) respectively. The air
velocity at the slot exit is varied by changing the fan speed so
that two different Reynolds numbers 4.3x105 and 7.86x105 are
studied in the analysis. In experiments, the system at specified
inside, outside and airflow conditions is approximately run for
two hours to establish steady-state conditions. In recording
data, the system data is divided into two groups: 1. The cooling
unit data that includes refrigerant side volumetric flow rate, the
pressure and temperature at the inlet and outlet of compressor,
condenser and evaporator. Additionally, temperature and
volumetric flow rate of air through the condenser, and the fuel
consumption of the engine are also recorded. 2. The container
data covers air velocity at the slot exit, and a total of 110
thermocouples measure the surface temperatures of all surfaces
(inside and outside) of the container and local temperature
variation of the airflow. Measurements carried out at both sides
(air side and refrigerant side) to validate the data with an
accuracy band ±6.5% of the air side measurements. The
thermal performance of ventilation in the container is measured
by a non-dimensional temperature distribution, θx at a particular
cross-section. As a result of measured data, conventional COP
of the system and f COP based on fuel consumption rate are
also presented.
