conceptual design of a waste heat recovery cycle is carried out in attempt to enhance the thermal efficiency of a steam power plant. in the recovery system, super-critical an co2 is employed as the working fluid operating in a brayton cycle. low grade heat rejected by the flue gases through the stack is used as the primary heat source, while a secondary heat exchanger utilizes the hot gases lea...

The use of zeotropic mixtures in well-designed heat pump cycles enables considerable performance improvements. Temperature glide matching the exchange processes and recovery expansion losses by internal decrease exergy destruction yield higher cycle performances. A case study for supply to district heating is presented, indicating increases COP from 4.3 a pure fluid standard 5.2 mixture with op...

Heat pump electricity costs grow with a power relationship as the evaporator temperature in cycle decreases. The thermo-economic study of solar thermal-assisted heat and storage system determines minimum cost coupled for an temperature. Through two case studies, one dairy industry other 2G bioethanol production, was evaluated different temperatures evaporator, from 30 to 90 °C, determined. For ...

The presented work analyses the design space and performance potential of microfabricated Brayton cycle and Rankine cycle devices, accounting for lower component efficiencies, temperatures limited by the material properties and system implementation constraints imposed by silicon microfabrication and miniaturization. By exploring the design space of such microsystems, their potential thermal ef...

An evaluation of a variety of efficient water heating strategies for an all-electric single family home located in a mixed-humid climate is conducted using numerical modeling. The strategies considered include various combinations of solar thermal, heat pump, and electric resistance water heaters. The numerical model used in the study is first validated against a year of field data obtained on ...

Potential improvements of the Coefficient of Performance (COP) were investigated for R-407C at cooling and heating conditions of a residential heat pump. The study used CYCLE-11, a semi-theoretical vapor-compression cycle model, which was upgraded to simulate cross-flow, counter-flow, and parallel-flow evaporator and condenser with no restrictions on specifying superheated vapor and subcooled l...