2 research outputs found
Energy- and exergy-based working fluid selection and performance analysis of a high-temperature PEMFC-based micro combined cooling heating and power system
A combined cooling heating and power (CCHP) system based on high-temperature proton exchange membrane fuel cell (PEMFC) is proposed. This CCHP system consists of a PEMFC subsystem, an organic Rankine cycle (ORC) subsystem and a vapor compression cycle (VCC) subsystem. The electric power of the CCHP system is 8Â kW under normal operating conditions, the domestic hot water power is approximately 18Â kW, and the cooling and heating capacities are 12.5Â kW and 20Â kW, respectively. Energy and exergy performance of the CCHP system are thoroughly analyzed for six organic working fluids using Matlab coupled with REFPROP. R601 is chosen as the working fluid for ORC subsystem based on energy and exergy analysis. The results show that the average coefficient of performance (COP) of the CCHP system is 1.19 in summer and 1.42 in winter, and the average exergy efficiencies are 46% and 47% under normal operating conditions. It can also be concluded that both the current density and operating temperature have significant effects on the energy performance of the CCHP system, while only the current density affects the exergy performance noticeably. The ambient temperature can affect both the energy and exergy performance of the CCHP system. This system has the advantages of high facility availability, high efficiency, high stability, low noise and low emission; it has a good prospect for residential applications
Particle-Assisted Semidirect Breath Figure Method: A Facile Way to Endow the Honeycomb-Structured Petri Dish with Molecular Recognition Capability
Recently, we have developed a semidirect
breath figure (sDBF) method for direct fabrication of large-area and
ordered honeycomb structures on commercial polystyrene (PS) Petri
dishes without the use of an external polymer solution. In this work,
we showed that both the pore size and the pore uniformity of the breath
figure patterns were controllable by solvent amount. The cross-sectional
image shows that only one layer of pores was formed on the BF figure
patterns. By combing the sDBF method and Pickering emulsion and using
the modular building blocks, we endowed the honeycomb-structured Petri
dish with molecular recognition capability via the decoration of molecularly
imprinted polymer (MIP) nanoparticles into the honeycomb pores. The
radioligand binding experiments show that the MIP nanoparticles on
the resultant honeycomb structures maintained high molecular binding
selectivity. The reusability study indicates that MIP-BF patterns
had excellent mechanical stability during the radioligand binding
process. We believe that the modular approach demonstrated in this
work will open up further opportunities for honeycomb structure-based
chemical sensors for drug analysis, substrates for catalysts, and
scaffold for cell growth