Vishaldeep Sharma

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We are developing a micromachined vacuum pump for portable analytical instruments that is comprised of a mechanical roughing pump integrated with a micro-machined ion pump. The focus of this paper is on the development of the roughing pump. We have fabricated two generations of micromachined displacement vacuum pumps to explore various design options.(More)
Carbon dioxide (CO2) being a low Global Warming Potential (GWP) refrigerant is becoming a popular choice as an efficient refrigerant in supermarket refrigeration systems, not only in moderate climates such as Northern Europe but also in the United States. Due to its low critical temperature (31.06°C), CO2 systems also offer potential for waste heat(More)
The traditional multiplex direct expansion (DX) refrigeration system used in commercial applications is prone to significant refrigerant leakage, especially older existing systems. The use of high Global Warming Potential (GWP) refrigerants in these systems, combined with high refrigerant leakage, can result in considerable direct carbon dioxide equivalent(More)
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