References of "Parthoens, Antoine"
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See detailInvestigation of a single room ventilation heat recovery exchanger under frosting conditions: Modeling, experimental validation and operating strategies evaluation
Gendebien, Samuel ULiege; Parthoens, Antoine ULiege; Lemort, Vincent ULiege

in Energy and Buildings (2019), 186

This paper tackles the issue of frost formation in air-to-air heat recovery devices dedicated to single room ventilation by means of both numerical simulations and experimental approaches. In such heat ... [more ▼]

This paper tackles the issue of frost formation in air-to-air heat recovery devices dedicated to single room ventilation by means of both numerical simulations and experimental approaches. In such heat exchangers, it is commonly known that the formation of a frost layer on the surface generates an additional thermal resistance and a flow section reduction, which leads to an overall degradation of the overall unit performance. This paper proposes a three-zone model, considering a dry, a wet and a frost zone, by determining the location of moving boundaries. Each zone is handled independently and the relative proportion of each zone is determined by means of the exchanger wall temperature. Besides this frost model, a defrost model is also envisaged. Once validated with experimental data collected on a U-flow-type heat exchanger, the developed model is used to implement different strategies to reduce or prevent frost formation in the exchanger. Based on three different criteria, these strategies are compared with each other to evaluate their benefits and drawbacks. The criteria give information on the energy efficiency of the ventilation, on the air renewal quality and on the pressure balance between the inside and the outside of the building. [less ▲]

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See detailModel development of a new single room ventilation enthalpy exchanger under wet conditions
Parthoens, Antoine ULiege; Gendebien, Samuel ULiege; Lemort, Vincent ULiege

in 10th International Conference on System Simulation in Buildings, Liege, December 10-12,2018 (2019)

The present paper deals with the model development of an enthalpy exchanger under wet conditions in the frame of single room ventilation. Numerous models take into account simultaneous heat and vapour ... [more ▼]

The present paper deals with the model development of an enthalpy exchanger under wet conditions in the frame of single room ventilation. Numerous models take into account simultaneous heat and vapour transfer, but not liquid transfer. This new model takes into account condensation on stale air side, liquid transfer through porous membrane and finally water evaporation on the fresh air side. The involved phenomena depend on each other as the evaporation cools down the membrane, intensifying condensation. A coupling is then necessary, leading to spatial discretization of the exchanger and numerical considerations. An experimental set-up has been used to validate the membrane mass transfer model. The enthalpy exchanger model is then used to simulate performances under different outdoor conditions. [less ▲]

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See detailExperimental and numerical investigation of a roots expander integrated into an ORC power system
Parthoens, Antoine ULiege; Guillaume, Ludovic ULiege; Dumont, Olivier ULiege et al

in Proceedings of Purdue 2018 (2018, July)

The performance of internal combustion engines can be improved by valorising the waste heat by means of organic Rankine Cycle power systems (ORC). This paper focuses on an expander of a truck-embedded ORC ... [more ▼]

The performance of internal combustion engines can be improved by valorising the waste heat by means of organic Rankine Cycle power systems (ORC). This paper focuses on an expander of a truck-embedded ORC system. The considered expander is a roots machine. The roots machine is a volumetric machine characterized by a theoretical internal volume ratio of 1. It is typically used as compressor under low pressure ratios (for instance, engine supercharging or air “blowers”). First, a test rig has been built to perform several tests on the volumetric machine. It is an ORC power system with a typical architecture using R245fa as working fluid (and 5% in mass oil fraction), heated oil as heat source and tap water as heat sink. Maps presenting produced powers, filling factors and isentropic efficiencies versus on one side the pressure ratio (from 1.2 to 4.5) and on the other side the shaft rotational speed (from 1000 to 11000 RPM) are investigated. The maximal delivered power is slightly above 3 kW. Concerning the filling factor the range is between 0.85 and 2.75 and the isentropic efficiency reaches a maximum about 50%. Wet expansions are envisaged leading to a deterioration of the performance. From the experimental data, a semi-empirical model is calibrated. This model is able to extrapolate the performance outside the experimental operating conditions and identify the different loss sources. Moreover, effects of overheat level and lubricating oil are also envisaged. The actual tested machine does not have an internal volumetric ratio strictly equal to 1 but is slightly larger. Such volumetric ratio implies that best efficiencies are achieved under small pressure ratios. However, these limited pressure ratios do not lead to large produced powers. To tackle this issue, simulations based on the calibrated model are driven for two expanders in series. This allows to increase the global internal volumetric ratio and shift the best performance towards higher pressure ratios. To enhance either the efficiency or the output power, the intermediate pressure (i.e. the pressure between the two expanders in series) is numerically optimized. [less ▲]

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See detailDevelopment of multi-zone heat exchanger model under frost and defrost conditions
Parthoens, Antoine ULiege; Gendebien, Samuel ULiege; Lemort, Vincent ULiege

in Proceedings of ECOS 2018 (2018, June)

Global warming is now recognized by the major part of the scientific community. An important issue is the carbon dioxide emissions. The residential area is one major impacting sector, accounting for 30 ... [more ▼]

Global warming is now recognized by the major part of the scientific community. An important issue is the carbon dioxide emissions. The residential area is one major impacting sector, accounting for 30% of the final energy consumed (in Europe). A solution to reduce heat losses due to ventilation is single room ventilation with heat recovery. The objective of this paper is to present the development of a model for the design of a heat exchanger implemented in this kind of unit. The proposed modelling is a multi-zone model with a moving boundary. It allows to consider completely dry, partially wet or completely wet regimes on the stale air side. The boundary between the different zones is determined by means of the exchanger wall surface temperature. This model can be extended to frost conditions by adding a new “frost zone”. The formation of a frost layer on the surface generates an additional thermal resistance as well as a fouling inside ducts. Consequently, it reduces the flow section and the air flow rate for a given fan’s rotational speed. The frost quantity may increase until it blocks the passage ways for exhaust air and stops completely the airflow. The aim of this paper is to introduce the new multi-zone model taking into account the frost formation as well as defrost phase and predicting the impact on the hydraulic and thermal performance. This model is validated on the basis of some experiments done on an actual air-air heat exchanger under frost conditions. These experiments also reveals the limitations of the model. [less ▲]

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See detailPassive technologies: breathing windows
Parthoens, Antoine ULiege

Conference (2018, March)

This presentation shows the results of the implementation of decentralized ventilation units in the frame of the European Bricker project

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See detailExperimental investigation and optimal performance assessment of four volumetric expanders (scroll, screw, piston and roots) tested in a small-scale organic Rankine cycle system
Dumont, Olivier ULiege; Parthoens, Antoine ULiege; Dickes, Rémi ULiege et al

in Energy (2018)

The aim of this paper is to facilitate the selection of the expander for a small-scale organic Rankine cyclebased on an experimental comparison of a piston, a screw, a scroll and a roots expander. First ... [more ▼]

The aim of this paper is to facilitate the selection of the expander for a small-scale organic Rankine cyclebased on an experimental comparison of a piston, a screw, a scroll and a roots expander. First, based on aliterature review, a comparison between these four technologies of volumetric expansion machines isperformed. Afterward, four displacement expanders [2e4 kW] are tested on two similar small-scale ORCunit withfluid R245fa. The maximum effective isentropic efficiencies measured are 53% for the pistonexpander and the screw expander, 76% for the variable-speed scroll and 48% for the roots machine.However, these performances do not reflect the highest efficiencies achievable by each expander: thetest-rig presents experimental limitations in terms of massflow rate and pressure drop (among others)that restricts the achievable operating conditions. The calibration of semi-empirical models based on themeasurements allows to overcome this issue and to predict the isentropic efficiency in optimal condi-tions despite the limitations of the test-rigs. Based on experimental results, extrapolated prediction ofthe semi-empirical model and practical considerations, some guidelines are drawn to help the reader toselect properly a volumetric expander. [less ▲]

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