Working fluids selection and parametric optimization of an Organic Rankine Cycle coupled Vapor Compression Cycle (ORC-VCC) for air conditioning using low grade heat

2016 ◽  
Vol 129 ◽  
pp. 378-395 ◽  
Author(s):  
Muhammad Tauseef Nasir ◽  
Kyung Chun Kim
Keyword(s):  
Air Conditioning ◽  
Parametric Optimization ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Low Grade ◽  
Vapor Compression ◽  
Working Fluids ◽  
Vapor Compression Cycle ◽  
Compression Cycle ◽  
Low Grade Heat

Modeling and Experimental Investigation of an Oil-Free Microcompressor-Turbine Unit for an Organic Rankine Cycle Driven Heat Pump

2014 ◽  
Vol 137 (3) ◽  
Author(s):  
Jonathan Demierre ◽  
Antonio Rubino ◽  
Jürg Schiffmann
Keyword(s):  
Turbine Unit ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Heat Pumps ◽  
Tip Clearance ◽  
Vapor Compression ◽  
Heating And Cooling ◽  
Vapor Compression Cycle ◽  
Compression Cycle ◽  
Thermally Driven

Domestic heating and cooling will more and more have to rely on heat pumps (HPs) in order to support a more rational use of primary energy consumption. The HP market is mainly dominated by electrically driven vapor compression cycles and by thermally driven sorption processes. The drawback of electrically driven vapor compression cycle is their dependence on an electrical grid and the fact that they increase the winter or summer electricity peak demands. Hence, a thermally driven vapor compression cycle would offer substantial advantages and flexibility to the end user for heating and cooling applications. This paper presents the investigation of an oil-free compressor-turbine unit (CTU) used for a thermally driven HP (TDHP) based on the combination of a HP compression cycle and an organic Rankine cycle (ORC). The CTU consists of a radial inflow turbine and a centrifugal compressor of the order of 2 kW each, directly coupled through a shaft supported on gas lubricated bearings. The CTU has been tested at rotor speeds in excess of 200 krpm, reaching compressor and turbine pressure ratios up to 2.8 and 4.4, respectively, and isentropic efficiencies around 70%. Comparisons between the experimental data and predictions of models, that are briefly described here, have been carried out. A sensitivity analysis based on the experimentally validated models shows that tip clearance, for both compressor and turbine, and surface roughness of the compressor are key parameters for further improving performance.

scholarly journals Thermodynamic Study of a Combined Power and Refrigeration System for Low-Grade Heat Energy Source

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 410
Author(s):  
Saboora Khatoon ◽  
Nasser Mohammed A. Almefreji ◽  
Man-Hoe Kim
Keyword(s):  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Combined Cycle ◽  
Performance Criteria ◽  
Low Grade ◽  
Refrigeration Cycle ◽  
Vapor Compression ◽  
Working Fluids ◽  
Vapor Compression Refrigeration Cycle ◽  
Vapor Compression Refrigeration

This study focuses on the thermal performance analysis of an organic Rankine cycle powered vapor compression refrigeration cycle for a set of working fluids for each cycle, also known as a dual fluid system. Both cycles are coupled using a common shaft to maintain a constant transmission ratio of one. Eight working fluids have been studied for the vapor compression refrigeration cycle, and a total of sixty-four combinations of working fluids have been analyzed for the dual fluid combined cycle system. The analysis has been performed to achieve a temperature of −16 °C for a set of condenser temperatures 34 °C, 36 °C, 38 °C, and 40 °C. For the desired temperature in the refrigeration cycle, the required work input, mass flow rate, and heat input for the organic Rankine cycle were determined systematically. Based on the manifestation of performance criteria, three working fluids (R123, R134a, and R245fa) were chosen for the refrigeration cycle and two (Propane and R245fa) were picked for the organic Rankine cycle. Further, a combination of R123 in the refrigeration cycle with propane in the Rankine cycle was scrutinized for their highest efficiency value of 16.48% with the corresponding highest coefficient of performance value of 2.85 at 40 °C.

Performance of a combined organic Rankine cycle and vapor compression cycle for heat activated cooling

Energy ◽  
2011 ◽  
Vol 36 (1) ◽  
pp. 447-458 ◽  
Author(s):  
Hailei Wang ◽  
Richard Peterson ◽  
Kevin Harada ◽  
Erik Miller ◽  
Robbie Ingram-Goble ◽  
...  
Keyword(s):  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Vapor Compression ◽  
Vapor Compression Cycle ◽  
Compression Cycle
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