Performance analysis of multistage high‐temperature heat pump cycle

Abstract High‐temperature heat pumps (HTHPs) that can supply at temperatures and above 200°C have the potential to increase energy efficiency decrease carbon dioxide (CO 2 ) emissions in industrial processes. In this study, three reversed Rankine cycles using water vapor (R‐718) as working medium, with different intercooling strategies, were proposed their performance has been investigated. The thermodynamic was estimated under operating conditions, optimal pressure ratio (PR) between compression stages found be where both compressors had same PR. efficiency, φ , exergy η also analyzed optimum employed an intercooler first second (IC cycles) showed higher values compared spray‐injection cycle. Among IC cycles, IC‐in cycle, inward flow direction of sink IC, demonstrated deliverable temperature, T out than IC‐out cycles. To assess practical impact HTHP on CO reduction, PR for each stage limited 2.5. Theoretically, cycle could achieve a coefficient 5.86 or when evap cond 90°C 150°C, respectively. Additionally, study system reduce by 8.1% 2030 temperature up 200°C, replacing existing fossil boilers high‐efficiency HTHP.