Imperial College London

Dr Andrew J Haslam

Faculty of EngineeringDepartment of Chemical Engineering

Research Fellow



+44 (0)20 7594 5618a.haslam CV




C406Roderic Hill BuildingSouth Kensington Campus






BibTex format

author = {Kirmse, C and Taleb, AJ and Oyewunmi, OA and Haslam, AJ and Markides, CN},
title = {Performance comparison of a novel thermofluidic organic-fluid heat converter and an organic rankine cycle heat engine},
url = {},
year = {2015}

RIS format (EndNote, RefMan)

AB - The Up-THERM engine is a novel two-phase heat engine with a single moving part–a vertical solidpiston–that relies on the phase change of a suitable working fluid to produce a reciprocating displacementand sustained thermodynamic oscillations of pressure and flow rate that can be converted to useful work.A model of the Up-THERM engine is developed via lumped dynamic descriptions of the various enginesub-components and electrical analogies founded on previously developed thermoacoustic principles.These are extended here to include a description of phase change and non-linear descriptions of selectedprocesses. The predicted first and second law efficiencies and the power output of a particular Up-THERM engine design aimed for operation in a specified CHP application with heat source and sinktemperatures of 360 C and 10 C, are compared theoretically to those of equivalent sub-critical, nonregenerativeorganic Rankine cycle (ORC) engines. Five alkanes (from n-pentane to n-nonane) are beingconsidered as possible working fluids for the aforementioned Up-THERM application, and these arealso used for the accompanying ORC thermodynamic analyses. Owing to its mode of operation, lackof moving parts and dynamic seals, the Up-THERM engine promises a simpler and more cost-effectivesolution than an ORC engine, although the Up-THERM is expected to be less efficient than its ORCcounterpart. These expectations are confirmed in the present work, with the Up-THERM engine showinglower efficiencies and power outputs than equivalent ORC engines, but which actually approach ORCperformance at low temperatures. Therefore, it is suggested that the Up-THERM can be a competitivealternative in terms of cost per unit power in low-power/temperature applications, especially in remote,off-grid settings, such as in developing countries where minimising upfront costs is crucial.
AU - Kirmse,C
AU - Taleb,AJ
AU - Oyewunmi,OA
AU - Haslam,AJ
AU - Markides,CN
PY - 2015///
TI - Performance comparison of a novel thermofluidic organic-fluid heat converter and an organic rankine cycle heat engine
UR -
ER -