Thermodynamic analysis of ejector cooling cycles with heat-driven feed pumping devices
| Autor: | Guangming Chen, Volodymyr Ierin, Kostyantyn Shestopalov, Oleksii Volovyk |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Exergy
Work (thermodynamics) Materials science 020209 energy Nuclear engineering 02 engineering and technology Turbine Industrial and Manufacturing Engineering law.invention Refrigerant 020401 chemical engineering law 0202 electrical engineering electronic engineering information engineering 0204 chemical engineering Electrical and Electronic Engineering Civil and Structural Engineering business.industry Mechanical Engineering Building and Construction Injector Pollution General Energy Air conditioning Working fluid business Efficient energy use |
| Zdroj: | Energy. 186:115892 |
| ISSN: | 0360-5442 |
| DOI: | 10.1016/j.energy.2019.115892 |
| Popis: | The paper presents the results of thermodynamic analysis of ejector cooling cycles with heat pumping devices which supply the working fluid to the vapor generator. Two variants of heat pumping devices are considered in which the feed pump is driven by (1) an expander and a turbine and (2) a turbine. A mathematical model for determining the energy and exergy characteristics of the pumping devices and ejector systems as a whole is proposed. Refrigerant R245ca is selected as an environmentally friendly low-boiling working fluid of the ejector cooling cycles. The paper analyzes the effect of condensing and generating temperatures on the characteristics of ejector cooling cycles for the air conditioning systems. It is shown that the use of the work obtained in the expander and turbine taking into account the irreversibility of the working processes in the pumping devices leads to a slight decrease in the energy efficiency of the proposed systems, and, at the same time, it significantly increases their exergic efficiency. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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