Thermoelectric devices use the Peltier effect that creates a heat flux between the junctions of two different types of materials. The thermoelectric module also referred to as a heat pump transfers heat from one side to the other when a DC current is applied. This study carried out the theoretical analysis of a thermoelectric air conditioning system. A prototype thermoelectric air conditioner of 286 W cooling capacity was built and a testing enclosure made from plywood and Styrofoam was also constructed in order to validate the theoretical result with an experimentation. It was discovered that thermoelectric air conditioning took 4 minutes to reach its desired temperature of 22°C, whereas the standard air conditioning system (refrigeration cycle) took 20 minutes to cool to a room temperature. Economically, it was also discovered that thermoelectric air conditioning system is 50% cheaper than the refrigeration cycle air conditioning systems. The thermoelectric air conditioner has cheaper maintenance and greater estimated life span of 7 years more than the refrigeration air conditioner. This is because the air conditioner that operates on the refrigeration cycle uses a rotating compressor, while the thermoelectric air conditioner uses thermometric module.
Global warming is the general rise in global temperature caused by higher-than-normal amounts of greenhouse gases, which traps heat approaching the globe and allows heat waves to continue accessing the atmosphere and being unable to escape over time. Following worldwide attempts to phase out chlorinated fluids in order to preserve the ozone layer as a result of the Montreal Protocol, this study employed low-GWP alternative refrigerants to minimize greenhouse gas emissions. The Cycle-D-Hx software, which is a thermodynamic model of the refrigeration system with a graphical user interface, was used to assess the performance of household refrigerators using various types of refrigerants. Data from an R134A-charged household refrigerator was used to verify the model. The model was then used to evaluate the performance of a number of low-GWP alternative refrigerants, such as R404A, R449A, R513A, and R452A. The R452A was shown to have a high COP, a low potential for global warming, a low temperature glide, and a low potential for ozone depletion. In addition to these thermodynamic and environmental features, R452A blend is non-flammable, non-corrosive, and will not cause degradation of the metal parts of the refrigerating system's evaporator and compressor.
The energy storage ability and temperature arrangement of a concrete bed which was charged and discharged at the same time was examined mathematically in this research. This was carried out by modeling a single globe-shaped concrete which was utilized to simulate a series of points along the concrete bed axis. Charging and discharging mode of the system were compared for 0.0094, 0.013, and 0.019 m 3 /s air flow rates. Higher change in temperature response was detected between the charging and fluid to solid heat transfer process at the inception of the concrete bed and the heat gain by the cool air flowing inside the copper tube was fairly high. The analysis of energy storage efficiency was also carried out and it was noticed that the globe-shaped concrete of 0.11 m diameter has the highest storage efficiency of 60.5% at 0.013 m 3 /s airflow rate.
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