The cross‐flow heat exchanger involves a tractor moving between two fluids that flow in a direction perpendicular to each other, and one of the fluids is often a liquid and the other is a gas. This type of heat exchanger has been studied in many previous studies for its importance in air conditioning applications and many industrial applications. In this type of heat exchanger, the surface area for heat transfer is very large. Therefore, many techniques have been used to improve the thermal and dynamic performance of this type of heat exchanger. In this study, previous studies that used metallic foam as one of the ways to improve the performance of heat exchangers were reviewed. The most important techniques that were used in previous studies during the process of evaluating the thermal performance of a cross‐flow heat exchanger in the presence of different types of metal foam were clarified. The use of metal foam depends on important factors, including (1) the type of material, where copper and aluminum were used in most of the previous studies, due to their availability and ease of foam formation using these materials, in addition to the good thermal properties, (2) porosity, where the porosity value of metal foam ranged between 0.85 and 0.98 in the previous studies, (3) the density of pores, most of the studies ranged between 10 and 40 PPI.
This study investigates heat transfer through a heat pipe by analysing the evaporation and condensation of working fluid (distilled water) in two parts of the heat pipe to find the phase change phenomenon. A computational methodology was developed to simulate the phase change processes and a thermal model was simulated to determine the spatial and temporal temperature profile of the heat pipe and phase change location. The velocity and location of the phase change in the evaporator and condenser sections of the pipe were calculated at each stage, as was the temperature across the domain. The thermal efficiency of the heat pipe was improved by adding graphene oxide nanoparticles at an increase of 15%. When nanoparticles were added to the distilled water, the time of the phase change phenomenon was reduced in the evaporator and condenser sections. The capillary property was enhanced when nanoparticles were deposited in the wall of the evaporator’s wick structure. The temperature distribution of the phase change phenomenon was evaluated via the evaporation and condensation processes and the location of the interface line in the two main parts of the heat pipe.
The present work is an experimental study into the thermal performance of air conditioning system (split unit), bases on using renewable energy as an assisted facter. The serpentine tube flat plate solar collector (STFPSC) is combined with 1-ton capacity split air conditioning system, which is installed after the compressor to superheat the refrigerant that leaves the compressor. The conventional air conditioning (A/C) system is compared with the suggested system. The results show that the coefficient of performance (COP) of the solar assisted air conditioning system (SAAC), is affected by the enhancement of the solar collector, which enrolls the effect of solar collector tilt angle. The COP of the SAAC system is boosted by about 31.5% more than the conventional system at tilt angle 13.5 o , also the p-h diagram shows that the power consumption is enhanced at this angle.
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