|
This thesis presents a hybrid numerical scheme for the inverse
heat conductionproblem and an experimental equipment to estimate
the heat transfer coefficient and fin efficiency on the Plate
Finned-Tube Evaporator under frosting conditions. Thus, the
comparison of the heat transfer rate and fin efficiency obtained
by the assumption of the constant heat transfer coefficient and
the exact values is made. Afterward, the scheme of the inverse
heat conduction in conjunction with temperature measurements at
various times and various sensor locations is presented to
estimate the heat transfer coefficient on the fin.To evidence
the accuracy of the present scheme,the comparison of the present
estimations and exact values is made.In addition, the effect of
the measurement error and sensor location on the estimated
results is also be studied. We set up a plate finned-tube
evaporator in conjunction with the other experimental equipments
for measuring the frost thickness and fin temperature. The heat
transfer coefficient, heat transfer rate and fin efficiency on
the fin under frosting conditions can be determined using the
present method and these temperature measurements. In addition,
the effect of relative humidity of the air, refrigerant
temperature and air temperature on the frost growth, heat
transfer coefficient,overall heat transfer rate and fin
efficiency is also investigated. This tesis can present some
information for the relation between the frosting phenomenon and
performance of the evaporator under various operation
conditions. We hope that its results are useful for the design
of the refrigeration and air condition system.
|