Transient analysis of gas pipeline network

10.1016/S1385-8947(97)00109-5Chemical Engineering Journal69147-52CMEJ

Exergetic analysis of transcritical CO2 residential air-conditioning system based on experimental data

The experimental system for the transcritical CO2 residential air-conditioning with an internal heat exchanger was built. The effects of working conditions on system performance were experimentally studied. Based on the experimental dada, the second law analysis on the transcritical CO2 system was performed. The effects of working conditions on the total exergetic efficiency of the system were investigated. The results show that in the studied parameter ranges, the exergetic efficiency of the system increases with the increases of gas cooler side air inlet temperature, gas cooler side air inlet velocity and evaporating temperature. And it will decrease with the increases of evaporator side air inlet temperature and velocity. Then, a complete exergetic analysis was performed for the entire CO2 transcritical cycle including compressor, gas cooler, expansion valve, evaporator and internal heat exchanger under different working conditions. The average exergy loss in gas cooler is the highest one under all working conditions which is about 30.7% of the total exergy loss in the system. The second is the average exergy loss in expansion valve which is about 24.9% of the total exergy loss, followed by the exergy losses in evaporator and compressor, which account for 21.9% and 19.5%, respectively. The exergy loss in internal heat exchanger is the lowest one which is only about 3.0%. So in the optimization design of the transcritical CO2 residential air-conditioning system more attentions should be paid to the gas cooler and expansion valve.CO2 refrigerant Air-conditioning Exergetic efficiency Exergy loss

The influence of strip location on the pressure drop and heat transfer performance of a slotted fin

10.1080/10407780701301652Numerical Heat Transfer; Part A: Applications525463-480NHAA

An efficient and robust numerical scheme for the SIMPLER algorithm on non-orthogonal curvilinear coordinates: CLEARER

10.1080/10407790601009115Numerical Heat Transfer, Part B: Fundamentals515433-461NHBF

Improvement of SIMPLER algorithm for incompressible flow on collocated grid system

10.1080/10407790600939767Numerical Heat Transfer, Part B: Fundamentals515463-486NHBF

Transient double-diffusive convection in an enclosure with large density variations

International audienceAn extension of a slightly compressible flow model to double-diffusive convection of binary mixtures of ideal gases enclosed in a cavity is presented. The problem formulation is based on a low-Mach number approximation and the impermeable surface assumption is not invoked. The main objectives of this work are the statement of the mathematical model used, and the analysis of some significant results showing the influence of density variation on transient solutions for pure thermal or pure solutal convection as well as for thermosolutal convection in the special case where the thermal and solutal buoyancy forces are equal in intensity either for aiding or for opposing cases