Energy and exergy analysis of novel combined cooling and power (CCP) cycles. (September 2017)

• Record Type: Journal Article
• Authors: Rostamzadeh, Hadi; Ebadollahi, Mohammad; Ghaebi, Hadi; Amidpour, Majid; Kheiri, Reza
• Is Part Of: Applied thermal engineering. Volume 124(2017)
• Page Start: 152
• Page End: 169
• Publication Date: 2017-09
• Subjects: Combined cooling and power (CCP) cycles -- Organic Rankine cycles (ORCs) -- Ejector refrigeration cycle (ERC) -- Energy analysis -- Exergy analysis; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2017.06.011
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: A novel combined cooling and power (CCP) cycle is proposed. Proposed cycle is modified based on the power sub-cycle concept. First- and second-law analyses of the proposed cycles are carried out. Several environmentally-friendly pairs of working fluids are selected for the proposed CCP cycles. Sensitivity analysis of some key parameters of the proposed cycles is performed. Abstract: This paper presents energy and exergy analyses of the basic combined cooling and power (BCCP) cycle as well as three modified CCP cycles. These modified CCP cycles are brought together by an appropriate combination of the organic Rankine cycles (ORCs) and ejector refrigeration cycle (ERC) to produce power and refrigeration, simultaneously. The performance of different working fluids for each CCP cycle is investigated using isobutane as a fixed working fluid of the ERC and R123, R245fa, and isobutane as working fluids of the ORCs. Energy and exergy analyses are conducted showing that the thermal efficiency, primary energy saving ratio (PESR), exergy efficiency, and overall exergy destruction ratio can be improved by 24.5, 134, 72, and 32% throughout the presented state-of-art modification as well as working fluid selection, respectively. Thus, selection of R123/isobutane as working fluid and CCP cycle incorporating both recuperation and turbine bleeding as cogeneration system are the most appropriate selection from thermodynamics and environment viewpoints. Moreover, exergy analysis demonstrated that the generator accounts for the major losses in the overall exergy destruction between all components. At the end, parametric study is conducted to examine the effects of different key thermodynamic parameters on performance of different cycles. It is shown that one can obtain a higher PESR by increasing of the generator pressure and ejector mass entrainment ratio or by decreasing of the evaporator pressure and condenser temperature. It is also found that increasing of the generator pressure and ejector mass entrainment ratio or decreasing of the evaporator pressure and condenser temperature will increase the thermal efficiency. Moreover, a higher exergy efficiency can also be obtained by increasing of the generator pressure as well as the ejector mass entrainment ratio.