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Perforated plate matrix heat exchangers (MHE) are employed in applications that require high compactness (typically greater than 1500 m2/m3), high effectiveness (typically greater than 95%), and a small length (typically a few mm to a few hundred mm). There are no methods known in open literature for the complete sizing of the MHE. In this paper we, a method for the optimum sizing of MHE is presented...
The rigorous optimization of thermoelectric (TE) devices with inhomogeneous material properties is still an unsettled problem. With the help of a newly introduced method of generalized Lagrange multiplier functions a solution is presented. The method leads to a coupled system of ordinary differential equations, which can be solved swiftly numerically. That may also be of interest in other branches...
In this report, we describe the design of a concentrated solar thermoelectric (TE) system which can provide both electricity and hot water. Today's thermoelectric materials have a relatively low efficiency (~6% for temperature difference across the thermoelement on the order of 300°C). However since thermoelectrics don't need their cold side to be near room temperature, (in another word, one can chose...
This paper systematically studies the effect of the a-SiGe:H band gap on the solar cell performance. We found that the Ge incorporation efficiency drops with increasing the GeH4/SiH4 gas ratio. The Ge incorporation efficiency is the ratio between the Ge at.% to the GeH4/SiH4 gas ratio and it starts from 4 at 5% gas ratio and drops to 1% at 80 % gas ratio. Therefore, it is preferable to use small gas...
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