The dynamic behavior of the PEM (proton exchange membrane) fuel cell stack has great effect on the safety and effective operation of its applications. In this paper, a self-designed bulb-array is used to simulate the various loading conditions and study the dynamic behavior of a 2 kW PEM fuel...

We describe a new air-conditioning and heat-pump system, which may be used to separate a refrigerant mixture efficiently and adjust the composition in the system with cooling- or heating-load changes. A dynamic model has been developed to analyze the transient behavior of the capacity-control...

A heat-pump system for heat recovery at substations is analysed. The analysis and test results show that the system yields substantial energy savings and reduces pollution.

Thermodynamic properties and refrigerating performance for the alternative R32/134a mixtures in water-to-water heat pumps have been analyzed. Also, its dynamic model and flammability during the leakage process have been investigated. The results show that R32/134a (30/70) is a good alternative...

The R22 alternatives R32/125/152a and R290 and their mixtures have been analyzed and evaluated in a room air conditioner. The cooling capacities, energy efficiencies, compressor-discharge temperatures, and pressures of alternatives have been compared with R22. R32/125/152a mixtures were found to...

The objective of this paper is to investigate the performance characteristics of μDMFC (micro direct methanol fuel cell) using a novel concept of self-adaptive anode feeding pattern, which can be controlled by detecting the operating current. A comprehensive analysis, including polarization...

A start-up ignition burner has been proposed to reduce oil fuel consumption during the firing-up process and partial-load operation. To investigate the influence of different excess air ratios on bituminous coal combustion in the start-up ignition burner, full-scale reacting-flow experiments...