Experimental evaluation of the temperature rise characteristics of the refrigerant conveyed by the refrigerant pump in the solar ejector refrigeration system

To address the issue of temperature rise induced by refrigerant pump operation in solar ejector refrigeration systems, this study employs a multistage centrifugal pump. Through a combination of theoretical analysis and experimental investigation, using R142b as the working fluid, a test platform was constructed to simulate a flow range of 50-100%, assessing the thermal rise characteristics under varying rotational speeds and inlet pressures. By applying energy balance principles and dimensionless analysis, a predictive model for temperature rise was developed. The results reveal that lower flow rates and increased speeds lead to greater internal energy dissipation within the pump, significantly elevating the refrigerant temperature and compromising both pump efficiency and overall system stability. The proposed model accurately predicts over 95% of the data within a ?5% margin of error, demonstrating its applicability in engineering design and pump selection optimization.