Document Type : Research Paper
Abstract
Human blood plasma storage faces challenges like cold conditions, quality surveillance, stable freezing, and reliable facilities, while clinics lack transit chilling for quick processing at collection centres. A portable vapour compression chiller (PVCC) offers a secure solution for handling heat-susceptible items, addressing international health security risks, and delivering safe medical care in underdeveloped nations. Employing a copper tube evaporator (CTE) in contrast to a blast evaporator (BE), the research examines an improved dualstage vapour compression cascade technique (DSVCCT) that incorporates a storage compartment. A 12 kg storage capacity, 5 kVA generator provides a rapid, ultra-low temperature time-freezing temperature evaporator tested with cow blood plasma and monitored for freezer temperature decline and distribution. The system measurements are conducted to analyze the pull-down time (PDT), defrosting time (DT), power consumption (PC), coefficient of performance (COP), and overall efficiency (OE) at the different intermediate cascade temperatures. The system achieved -20°C with a pull-down time of 420 minutes, demonstrating 89.6% efficiency and 415.8 MJ and 105.6 MJ energy usage for copper tubes and blast evaporators, respectively. The refrigerating effect was recorded at 140.9 kJ/kg and 3.18 COP. The refrigerating effect was 140.9 kJ/kg and 3.18 COP. The modified refrigeration technique has been found to extend plasma refrigeration systems' shelf life by four days off-cycle, saving 4.62 MJ of energy at zero emissions and cost-effectively. The design is energyefficient, suitable for energy-deficient economies due to its longer shelf life and portability, making it ideal for transporting and managing heat-sensitive drugs in healthcare areas with limited resources.
