Personne :
Gosselin, Louis

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Structures organisationnelles
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Université Laval. Département de génie mécanique
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Voici les éléments 1 - 10 sur 37
  • Publication
    Accès libre
    Geothermal power plants with maximized specific power output : optimal working fluid and operating conditions of subcritical and transcritical organic rankine cycles
    (ScienceDirect, 2016-05-23) Gosselin, Louis; Mathieu-Potvin, François; Chagnon-Lessard, Noémie
    In this paper, the design of an Organic Rankine Cycle (ORC) is optimized by means of numerical simulations. The systems of interest are the subcritical and transcritical thermodynamic cycles. Optimizations are performed with the objective of determining the design that maximizes the specific power output. The design variables include the operating parameters (pressures, mass flow rates), and the best working fluid is determined by comparing the performance of 36 refrigerants. Optimization runs are performed for a wide range of geofluid temperatures (from 80 to 180 °C), and for a wide range of condenser temperature (from 0.1 to 50 °C). The results are summarized in charts that may be used as efficient tools for designing optimal geothermal power plants. Finally, an approximate analysis allowed to develop a new correlation for predicting the maximal specific power output of an ORC.
  • Publication
    Accès libre
    Combined heating and cooling networks with waste heat recovery based on energy hub concept
    (ScienceDirect, 2019-07-15) Gosselin, Louis; Ahmadisedigh, Hossein
    Waste heat recovery can help reducing operation costs and greenhouse gas emissions. In the present work, an “energy hub” template was employed to design combined heating and cooling networks in which heat pumps can be used to recover heat from the cooling loop and supply it to the heating loop. Heating and cooling loads of the network can be satisfied by natural gas boilers, electric boilers, chillers, and heat pumps. The design of the system and its operation over the year were optimized with respect to cost and greenhouse gas emissions under different combinations of heating and cooling loads. The introduction of 8760-h synthetic loads allowed covering several possible load profiles driving the energy hub. The contribution of each possible energy source and technology and the sizing of the heat pump system are optimized, while ensuring satisfaction of the heating and cooling demands. The optimized hub configurations for scenarios with and without waste heat recovery were compared, showing that heat pumps were beneficial in all scenarios. The optimal capacity of heat pumps to minimize total cost was found to be ∼80% of the maximal possible value from a thermodynamic analysis of the loads. The simultaneous minimization of cost and emissions revealed a relatively sharp transition from gas to electric heating as more emphasis is put on emissions than cost, but in all cases, waste heat recovery with heat pumps was heavily used to satisfy the heating and cooling loads.
  • Publication
    Accès libre
    Sensitivity analysis of heat exchanger design to uncertainties of correlations
    (2018-03-11) Gosselin, Louis; Lambert, Julien
    Heat exchanger design procedures rely on a series of correlations to estimate heat transfer coefficients, pressure drops, costs, etc. Each correlation is characterized by uncertainties, i.e. it returns an approximate value of the variable that it aims at predicting. This paper studies how sensitive the total cost evaluation is to these uncertainties for shell-and-tube heat exchangers. A variance decomposition approach is used to calculate the total effect of each uncertain variable. Three test cases are studied for which the most influential uncertainties were found to be those on the correlations for evaluating the purchase cost and the shell side heat transfer coefficient. Probability distributions of the total cost are presented and exhibit a large variance of the total cost. The impact of the cost of energy was also investigated, which revealed that uncertainty on energy cost had a smaller total effect than that of other variables.
  • Publication
    Accès libre
    New concept of combined hydro-thermal response tests (H/ TRTs) for ground heat exchangers
    (ScienceDirect, 2016-03-31) Gosselin, Louis; Raymond, Jasmin; Rouleau, Jean
    Current thermal response tests, used to estimate the subsurface thermal conductivity in the geothermal domain, are not designed to take into account groundwater flows. To measure the flow parameters, a new concept has been developed. Heating cables are installed within a borehole in contact to the formation, with three temperature probes strategically located at the edge of the borehole. Study of the evolution of temperature for each probe during both a heat injection phase and a recovery period allows determining ground thermal conductivity, groundwater flow velocity and orientation. Numerical simulations have been used to validate the proposed concept and establish its limits.
  • Publication
    Accès libre
    Case-study : fully prefabricated wood wall connection to improve building envelope and on-site efficiency
    (MDPI AG, 2022-12-09) Julien, Étienne; Blanchet, Pierre; Gosselin, Louis
    As fully prefabricated wood walls (FPWW) are envisioned to increase building envelope performance, the junction between panels becomes crucial. Since FPWW restricts access to the interpanel joints, it is preferable to generate an upstream mechanism to complete the joint automatically on-site. This study aimed to design a self-sealing joint for FPWW that would achieve high energy standards and accelerate on-site construction. Airtightness tests and thermal bridge assessments were conducted in the laboratory to compare the developed self-sealing joints with different sealing materials. These same tests were conducted on-site, in addition to observations of the assembly speed of conventional prefabricated walls and FPWW. Of all the materials tested, butyl tape showed the tightest connections. This material helps the joint developed to automatically seal adjacent walls spaced up to 7 mm apart. FPWW maximize the industrialization of conventional prefabricated walls by realizing the sealing details and the installation of doors, windows and exterior siding offsite. This way, FPWW could reduce the duration of a conventional single-family residential project. FPWWmaximizequality control while reducing transportation costs associated with conventional modular solutions.
  • Publication
    Accès libre
    Optimal design of geothermal power plants : a comparison of single-pressure and dual-pressure organic Rankine cycles
    (Elsevier, 2020-01-23) Gosselin, Louis; Mathieu-Potvin, François; Chagnon-Lessard, Noémie
    Four variants of the Organic Rankine Cycle (ORC) applied to geothermal power plants are optimized by means of numerical tools. These variants are: (i) the subcritical ORC with single-pressure heater (ORC/S/SC), (ii) the transcritical ORC with single-pressure heater (ORC/S/TC), (iii) the subcritical ORC with dual-pressure heater (ORC/D/SC), and (iv) the transcritical ORC with dual-pressure heater (ORC/D/TC). All the systems are recuperative and include a wet cooling tower. The objective function is the specific work output and design variables include operating pressures, mass flow ratios between the brine and the working fluid, superheaters effectiveness and cooling tower range. The systems are optimized for 20 different potential working fluids. The optimization is performed for inlet brine temperatures from 80 to 180 °C, and for ambient air wet bulb temperatures from 10 to 32 °C. The results show: (i) the superiority of ORC/D/TC for most of the cases, (ii) the relevance of using a dual-pressure heater at high sink temperature and low brine temperature, and (iii) the importance of choosing the right cooling tower range for an optimal power plant design.
  • Publication
    Lessons learned with respect to the CAE roadmap from the monitoring of a high-performance social housing building in Quebec City
    (Université Concordia, 2020-10-16) Gosselin, Louis; Rouleau, Jean; Blanchet, Pierre; Athienitis, Andreas
    A prototype was built in Quebec City to demonstrate the feasability of low-energy social housing buildings. The case study building was heavily monitored to follow its energy performance. This paper presents observations that emerged from this project regarding the design and operation of this social housing building. It shows the energy consumption of each individual dwelling, the indoor temperature in summer and heat fluxes flowing through the envelope. Lessons learned regarding lowenergy residential buildings that are resilient and powered by renewable energy are discussed.
  • Publication
    Accès libre
    Daylighting 'energy and comfort' performance in office buildings : sensitivity analysis, metamodel and pareto front.
    (Elsevier, 2017-09-29) Maltais, Louis-Gabriel; Gosselin, Louis
    Daylighting performance is an integral feature of sustainable building design. In this paper, two performance criteria were defined, namely an annual glaring index (AGI) and an annual energy requirement for lighting (AEL). Based on 1900 daylight simulations of an office building located in Montreal (Canada), a sensitivity analysis was performed to identify the most influential building design variables among a list of 15. Two sensitivity analysis techniques were employed. Window-to-wall ratios and the overhang dimension were among the most influential parameters for both AEL and AGI, whereas building orientation and aspect ratio, as well as visible transmittance, were found to have a relatively weak influence. A Pareto front demonstrating the optimal tradeoffs between AEL and AGI was approximated from the simulation sample. Finally, a metamodel is developed to calculate rapidly the daylight performance indices for a given set of the 15 design variables.
  • Publication
    Accès libre
    Maximizing specific work output extracted from engine exhaust with novel inverted Brayton cycles over a large range of operating conditions
    (Pergamon, 2019-10-15) Gosselin, Louis; Mathieu-Potvin, François; Chagnon-Lessard, Noémie
    The heat contained in internal combustion engine exhaust gases can be converted into mechanical energy by using an Inverted Brayton Cycle (IBC). In this paper, five different IBC versions are numerically modeled and optimized to maximize their specific work output: (i) basic IBC, (ii) IBC with liquid water drainage (IBC/D), (iii) IBC with liquid water drainage and a steam turbine (IBC/D/S), (iv) IBC with liquid water drainage and a refrigeration cycle (IBC/D/R), and (v) IBC with liquid water drainage, a steam turbine and a refrigeration cycle (IBC/D/S/R). The three latter cycles are presented for the first time in literature. The optimization is performed for a wide range of inlet gases temperatures (600–1200 K) and heat sink temperatures (280–340 K). Among the five IBCs, the IBC/D/S/R has the highest specific work output for the whole range of operating temperatures. A comparison with the subcritical Rankine cycle and Organic Rankine Cycles using isobutane and benzene shows that an IBC system might be a better choice for specific operating temperatures. Liquid water addition in the IBC/D/S/R leads to optimized designs using only the steam turbine at high inlet gas temperatures, indicating that a Rankine cycle is better suited for these conditions.
  • Publication
    Accès libre
    Numerical modeling of solid-liquid phase change in a closed 2D cavity with density change, elastic wall and natural convection
    (Elsevier, 2017-07-05) Gosselin, Louis; Dallaire, Jonathan
    In this paper, the solidification of water near its density extremum is simulated while taking into account the expansion of the phase change material resulting from the different density of the solid and liquid phases. A thermo-mechanical coupling is achieved through one of the boundaries of the cavity behaving as an elastic wall. A methodology is introduced in which the problem is adapted in order to be solved with commercial CFD software (ANSYS Fluent 17.0). It is shown that when both the density variations and interaction of the phase change material with its boundaries are taken into account, significant differences may be observed in the flow pattern and the thermal behavior of the system, as opposed to an approach where a free ceiling or a constant density would be used. The pressure buildup inside the cavity resulting from the expansion of the phase change material as it pushes against the elastic wall causes the melting temperature to drop, which hinders solidification. It is shown that this effect becomes more pronounced as the spring constant of the elastic wall increases. It is also demonstrated that, with the assumptions made in the present model, the pressure rise may significantly influence the buoyancy forces within the cavity and change the relative size of the two counter rotating convective cells in the liquid phase. In some cases, when the pressure rises very quickly, the density extremum in the cavity disappears which strongly changes the flow pattern, i.e., only a single counter-clockwise convective cell is present in the cavity. This, in turn, changes the shape and position of the solidification front considerably.