Evaporation in the micro-gap heat sink has a very high transfer coefficient. As result, it is significant for flux management. Heat rate can be enhanced further by including internal micro-fins. However, pressure drop penalty due to small gap height and fin surfaces major concern. Wall shear stress development responsible drop. This paper investigates effects of operating conditions, e.g., wall...

Greenhouse gas mitigation at landfills by methane oxidation in engineered biocover systems is believed to be a cost effective technology, but so far a full quantitative evaluation of the efficiency of the technology in full scale has only been carried out in a few cases. A third generation semi-passive biocover system was constructed at the AV Miljø Landfill, Denmark. The biocover system was fe...

The paper deals with the use of R-290/600a(50/50) and R-600a, that are now considered as alternative to R-134a to substitute R-12 in domestic refrigeration. A theoretical analysis of the mixture performance shows that both hydrocarbon refrigerants may be used. Tests of certain hermetic compressors confrrm that the mixture can be used both for old and new equipment, while the isobutane must be u...