Benoit Michel

Institut National des Sciences Appliquées de Lyon | INSA Lyon · Center for Thermal Sciences of Lyon (CETHIL - UMR5008)

Two typical 1-D homogeneous equilibrium models from the literature (constant and variable pressure mixing models) were used to study the ejector expansion transcritical CO2 heat pump cycle. A sensitivity analysis was performed to study the impact of the isentropic efficiency of the compressor and of each component of the ejector on the overall syst...

Frost is generally detrimental to the efficiency of refrigerated transport systems. To predict the frost growth on a flat cold plate, a Eulerian-Eulerian multiphase model is employed based on a non-dimensional phase change driving force with a frosting criterion for the velocity and water vapor concentration. This model allows for the local frost f...

The present work reports the numerical simulation of the heat transfer inside a refrigerated truck trailer equipped with three eutectic plates and fans. The numerical model solves the conjugated heat transfer inside the trailer under unsteady conditions. The conservation equations of mass, momentum and energy are solved in 3D and closed using the k...

The present work reports the Computational Fluid Dynamics simulation and analysis of the heat transfer inside a refrigerated truck trailer equipped with three eutectic plates and fans. The numerical model solves the conjugated heat transfer inside the trailer in 2D using the 𝑘 − 𝜔 Shear Stress Transport (SST) turbulence model. It has been already f...

Waste Heat Recovery in the industrial sector often requires to upgrade the temperature of the heat fluxes in order to make them useful for the process. Thermochemical Heat Transformer (THT) and especially 2-salt configuration, can play a major role as they can achieve high temperature lift when compared to alternative technologies. Despite various...

Thermochemical systems are a good alternative to current technologies for long-term heat storage, since the energy is stored as a chemical potential and there is no heat loss during the storage phase. A large number of studies have now been conducted on the development of integrated thermochemical reactors, but fewer studies have investigated separ...

The building sector in Morocco represents 25% of the country’s total energy consumption. The poor thermal performance of the building envelopes is one of the principal reasons for this consumption rate. In this study, the efficiency of integrating Phase Change Materials (PCM) into hollow bricks used in three typical housing types in the six climate...

L'étude concerne une modélisation sous COMSOL du couplage entre un système de production d'eau froide par Radiative Sky Cooling (RSC) et une Pompe À Chaleur (PAC) air/eau, et l'estimation des performances de ce système couplé en vue d'assurer les besoins en climatisation d'un bâtiment tertiaire à Bordeaux. Ces panneaux RSC, permettent par circulati...

This study presents a new plate-type falling film absorber design, consisting in a vertical grooved falling film absorber. The grooves are designed to obtain good absorber plate wettability, even at a low solution flow rate, resulting in a laminar solution flow regime. Using experimental and numerical tools, the vapor absorption on a LiBr falling f...

This paper presents an experimental and numerical design approach for a multi-layer insulation wall dedicated to refrigerated vehicles and containing a composite layer of PU-PCM foam. The thermal performances of the insulation walls and the thermal properties of the insulation materials are investigated using complementary experimental tools at dif...

Their high energy density and low heat losses between storage and recovery times make thermochemical processes a promising way to achieve long-term (seasonal) storage. Among the available reactor configurations, open systems using a packed bed of reactive solid are simple and efficient. This paper reports on the local operation and reactive bed beh...

This paper presents an experimental and numerical design study of an insulation wall for refrigerated vans. The thermophysical properties of the insulating multilayer panel, the external environment impact (solar irradiation, temperature, etc.) and durability are taken into account. Different tools are used to characterize the thermal performances...

This paper investigates an innovative open thermochemical system dedicated to high density and long term (seasonal) storage purposes. It involves a hydrate/water reactive pair and operates with moist air. This work focuses on the design of and experimentation with a large scale prototype using SrBr2/H2O as a reactive pair (400 kg of hydrated salt,...

This paper focuses on the study of a solid/gas thermochemical reaction between a porous reactive bed and vapor. The objective is to determine the operating mode, either closed or open system, that best suits the requirements of a thermochemical seasonal storage applied to house heating. These two working modes have been compared thanks to two valid...

This paper focuses on the characterization and modeling of a solid/gas thermochemical reaction between a porous reactive bed and moist air flowing through it. The aim is the optimization of both energy density and permeability of the reactive bed, in order to realize a high density thermochemical system for seasonal thermal storage for house heatin...

Given the fact that there is a delay between the solar resource and its use, it might be interesting to use excess solar energy during the summer by doing a long-term thermal storage in order to restore the energy surplus during the heating periods. Solid/gas thermochemical systems are good candidates for inter-seasonal heat storage. They allow to...