Thermal-economic design optimization of an instant cooling water dispenser with a vapor compression refrigeration system

초록

Water dispensers (WDs) are widely used in residential and commercial applications. Conventional reservoir-type water dispensers (RC-WDs) consume high standby energy and pose a risk of bacterial growth, whereas instant cooling WDs (IC-WDs) with a vapor compression refrigeration (VCR) reduce energy use and enhance hygiene by eliminating the reservoir. However, thetransient thermal performance and economic feasibility of IC-WDs are rarely optimized simultaneously, particularly with the stringent geometric constraints in cooling modules. In this study, the thermal and economic performance of an IC-WD with a VCR system was optimized using a transient simulation model developed in Dymola and validated through steady-state and dynamic experiments. The baseline system is defined as a representative heat exchanger, having an evaporator height fraction (HFeva) of 19.3 % with an evaporator outer diameter (ODeva) of 6.5 mm and a water-coil outer diameter (ODwatercoil) of 6.4 mm. The effects of evaporator and water-coil

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