Isobaric Expansion Engine Compressors: Thermodynamic Analysis of the Simplest Direct Vapor-Driven Compressors

Isobaric expansion (IE) technology is a promising solution for mini- and medium-scale low-grade heat utilization. IE engines directly convert to mechanical energy are particularly interesting as direct-acting, vapor-driven pumps compressors. The elimination of multiple transformations, technical simplicity the ability use widely available (<100 °C) instead fossil fuels attractive features this technology. purpose paper was present new compression based on Worthington type engines, analyze process analytically numerically, provide first assessment its potential. simplest single- double-acting schemes were considered arbitrary low high pressures compressed gas/vapor driving vapor. In these schemes, compressor piston rigidly connected that an engine/driver. vapor efficiency driver characterized by ratio network carried out in cycle consumed mass performed thermodynamic analysis showed how depends parameters. It found comparison with if work much less than pump at same pressure ratio. This occurred because spent itself. As result, thermal engine compressors lower pumps. difference very large feed significant no regeneration applied. results obtained useful achieving improvements technology, which will be reported subsequent publications.