Imperial College London


Faculty of EngineeringDepartment of Chemical Engineering

Professor of Clean Energy Technologies



+44 (0)20 7594 1601c.markides Website




404ACE ExtensionSouth Kensington Campus






BibTex format

author = {Wang, K and Herrando, M and Pantaleo, AM and Markides, CN},
title = {Thermodynamic and economic assessments of a hybrid PVT-ORC combined heating and power system for swimming pools},
url = {},
year = {2018}

RIS format (EndNote, RefMan)

AB - The thermodynamic and economicperformance of a solar combined heatand power(S-CHP) system based on an array of hybrid photovoltaic-thermal (PVT) collectorsandan organic Rankine cycle (ORC)engineis considered for the provision of heating and power to swimming poolfacilities. Priority is given to meeting the thermaldemand of the swimming pool,in order to ensure a comfortable condition for swimmers in colderweather conditions, while excessthermal output from the collectorsat highertemperatures is converted toelectricityby the ORC engine inwarmerweather conditions. The thermodynamic performance of this system and its dynamic characteristicsare analysed on the basis of a transient thermodynamic model. Various heat losses and gains are considered in accordance toenvironmental and user-relatedfactorsfor both indoor and outdoor swimming pools. A case study is then performed for the swimming pool atthe UniversitySportCentre (USC)of Bari, Italy. The results show thatemployinga zeotropic mixture of R245fa/R227ea (30/70%) as the ORC working fluidallows such an ORC systemto generate~50% more power than when usingpure R236eadue to the better temperature matchof the cycle tothe low-temperature hot-water heat sourcefrom the output of the PVT collectors.Apart from generatingelectricity, the ORC enginealso alleviatesPVT collectoroverheating,and reducesthe required size of the hot-water storage tank. With an installation of 2000 m2of PVT collectors, energetic analysesindicate that the proposedS-CHP systemcan cover 84-96% of the thermal demand of the swimming pool during the warm summer months and 61% of itsannually integratedtotal thermal demand. In addition, the system produces a combined (from thecollectors andORC engine) of 328 MWhofelectricityper year, corresponding to 36% of the total electricity demand of the USC, with ~4% coming from the ORC engine.Theanalysis suggestsa minimum payback time of 12.7yearswith anopt
AU - Wang,K
AU - Herrando,M
AU - Pantaleo,AM
AU - Markides,CN
PY - 2018///
TI - Thermodynamic and economic assessments of a hybrid PVT-ORC combined heating and power system for swimming pools
UR -
ER -