Energy and exergy analysis for VCRS of a water dispenser

Abstract

Because of the scorching weather and people's innate demand for cool water, water dispensers are very common throughout the middle east. The apparatus used for the experimental test included a water cooler, a small refrigerator, a wire-on-tube condenser, a low back pressure reciprocating compressor, and a capillary tube that served as a throttling device. By adding four pressure trancedusers and gauges, a turbine meter to record the refrigerant flow rate, many temperature sensors to monitor the air and refrigerant temperatures, and a device to measure power consumption, the machine is transformed into a laboratory machine. Data acquisition is being connected to all of these measuring devices, and the computer has been instantly registered with the data. The analysis of energy and exergy was finished by experimentation. The main conclusions are as follows: The water dispenser operates in line with the real vapor compression refrigeration system due to the pressure drop and heat losses that take place throughout the test.

The water temperature drops in two stages: first, it drops quickly from 30 to 18 °C in 20 min, and then it drops from 18 to 10 °C in 60 min. The power usage increases in tandem with the rise in the surrounding temperature. Less than a third of the power was used for compression, while the remaining two thirds were used for heat and friction losses. The refrigerator's and water cooler's respective cooling capacities and heat losses. The exergy efficiency of each system component is shown; the compressor shows a lower efficiency value of 0.75 and the water cooler a higher efficiency value of 0.96 for the different ambient temperatures. The wire-on-tube condenser took 0.93, the refrigerator took 0.91, and the throttling took 0.95. The exergy destruction of the system components showed that the compressor lost 23 W of high energy, followed by the refrigerator (8W), wire-on-tube condenser (6 W), and throttling (5 W), with the water cooler experiencing lesser losses of 3 W at room temperature (30 °C). The C.O.P. act less than unity, the C.O.P. Carnot is around four units.