Working Fluid Selection and Thermodynamic Performance of the Steam Jet Large-Temperature-Drop Heat Exchange System
- 213 Downloads
Steam jet large-temperature-drop heat exchange system (SJHE) is presented to improve the heat exchange effect between exothermic and endothermic media in the heat exchange process. In this paper, with the higher efficient CRMC ejector, the mathematical model of the SJHE system is constructed. We compared the application scopes of two system constructions with 10 different working fluids and select the more feasible system construction as the optimal system. Based on the real properties of 10 environment-friendly dry pure fluid, R141b is screened as the best cycle working fluid for the system, using which the exothermic medium can be reduced to 33.7 °C in the district heating situation (primary water supply temperature: 130 °C, and the temperature lift range of secondary water is 45–60 °C). Moreover, the thermodynamic characteristics of the SJHE system are evaluated to achieve a better understanding of the thermal performance of this new heat exchanger system.
KeywordsLarge-temperature-drop heat exchange system System construction comparison Working fluid selection Thermodynamic evaluation
This work has been supported by “the Fundamental Research Funds for the Central Universities” (Grant No. HIT. NSRIF. 2017056).