Multiple Expansion ORC for Small Scale – Low Temperature Heat Recovery

Year 2018, Volume: 21 Issue: 1, 62 - 68, 01.03.2018

D. Micheli , M. Reini , R. Taccani

https://doi.org/10.5541/ijot.5000207080

Cited By: 2

Abstract

ORCs are widely recognized as one of the
most suitable solution for energy recovery, if the temperature of the heat
source is of about 200°C, or lower. In case of heat sources of about 100 kW or
smaller, the more common solutions prescribe a simple cycle and a single stage
expander, in order to reduce complexity and costs. Scroll expanders, derived
from scroll compressors, are expected to be available at very low unit costs.
The drawbacks of this kind of solutions, originally designed for automotive, or
HVAC applications, are mainly two: the low fixed volumetric expansion ratio and
the small volumetric flow rate, that are not always well-suited for the
requirements of power production. In this paper, different ORCs with multiple
expansions are evaluated with the aim of achieving a better exploitation of
small scale-low temperature waste heat sources. The comparison takes in
consideration different possible solutions for the multiple expansions, with
internally recuperated and not-recuperated cycles, whilst the data describing
the actual behaviour of compressors derived scroll expanders have been
previously obtained by a test rig, set up at the University of Trieste, using
R245fa as working fluid.

Keywords

ORC; scroll expander; heat recovery; low temperature applications

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