Experimental investigations on thermal performance of phase change material – Trombe wall system enhanced by delta winglet vortex generators

Phase Change Material Coating on Autoclaved Aerated Lightweight Concrete for Cooling Load Reduction

“…One of the approaches to reducing energy consumption in buildings and enhancing the indoor thermal environment is the integration of phase change material (PCM) into a building or building services system, which was first used for thermal storage in buildings in 1980 [1], to increase thermal storage effectiveness. Then, experiments have been reported that used PCMs in PCM trombe walls [2,3], wall boards [4 -6], shutters or window [7], ceiling boards [8,9] and roof [10 -12].…”

Numerical and Experimental Investigations of Composite Solar Walls Integrating Sensible or Latent Heat Thermal Storage

“…The thermal energy supplied by the composite Trombe wall equals, over the period considered, 4.4 kWh/m 2 for the calculation and 4.7 kWh/m 2 for the estimation derived from fluxmeter measurements; the difference between the two methods is on the order of 6.3%. As regards the results listed in Table 3, the total accumulation of measured solar energy over this 7-day period (April [19][20][21][22][23][24][25][26]2014) is equal to 21.4 kWh/m 2 (per m 2 of solar wall). Most recently, 35.8% of the total energy, i.e., 7.7 kWh/m 2 , was absorbed by the storage wall at its external surface.…”

“…From the results obtained, PCM integration into a lightweight building component helped minimize the fluctuation of inside temperature for all climatic areas studied. Another research effort implementing DWVG (delta winglet vortex generators) on the outer surface of the storage wall containing PCM (CaCl 2 · 6 H 2 O) is presented in [21]. The purpose of using this tool was to enhance heat transfer by convection; consequently, the results relative to airflow rate and room heating rate indicated that use of DWVG raised performance by 28.5% and 39.4%, respectively, compared to the case without DWVG.…”

“…It was subsequently redesigned as an architectural element by F. Trombe and J. Michel [11], as frequently acknowledged in published papers on: Trombe wall, Trombe-Michel solar wall, or composite solar wall. In current research dedicated to energy and environmental contexts, passive solar wall techniques are more relevant than ever, leading to the development of various passive configurations, namely: (a) the classical Trombe wall: engineering techniques [12], theoretical and experimental investigations of heat transfer [13], comparison of the effects of air flow rate between the one-dimensional and two-dimensional models [14], and the numerical study of thermal performance [15]; (b) the PCM Trombe wall: clay bricks integrating PCM macro-capsules functioning as the storage wall [16], thermal performance of a PCM storage wall in temperate and hot climates [17], a simulation study of building walls using the collector-storage wall integrating PCMs [18], a summary of the investigation and analysis conducted on systems incorporating PCMs as storage elements [19], the heat storage wall of the studied building ventilation using black paraffin wax [20], and experimental investigations of PCM wall thermal performance improved by delta winglet vortex generators [21]; (c) a composite Trombe wall with or without PCM: the numerical study of a composite Trombe wall model both with and without PCM in relying on the Dymola/Modelica software [22], numerical studies of the comparison between two walls using sensible heat (with concrete as the storage wall) by means of TRNSYS software [23], experimental studies on the energy performance of a composite Trombe wall using concrete blocks as the storage element [24], an experimental study of a small-scale Trombe wall integrating the brick-shaped packages of PCM (hydrated salt) [25], and a theoretical study of a solar wall collector system on thermal performance [26]; and (d) a photovoltaic (PV) Trombe wall: applied in a one-room building model using TRNSYS software [27,28], a numerical study using FORTRAN to simulate the influence of photovoltaic glazing on the thermal and electrical performance of a photovoltaic-Trombe wall [29], a PV-Trombe wall assisted by a DC fan [30], a numerical study of the two-dimensional model of a PV glass panel [31,32], validation of the energy modeling of a building using computational fluid dynamics (CFD) and comparison of the system with a PV panel, single glass and double glass [33,34], experimental and numerical studies during winter correlated with a south facade design [35], and a numerical study of the periodic modeling o...…”

Traditional and New Types of Passive Flow Control Techniques to Pave the Way for High Maneuverability and Low Structural Weight for UAVs and MAVs

“…VG examples are not limited to airfoil [20], and they can also utilize the devices such as bluff bodies [21], noise reduction [22], wind turbines [23], swept wings [24], and heat exchangers [25,26], just to name a few. VGs, which were first investigated by Taylor [27], are generally small plates having rectangular or triangular shapes.…”