Conference Agenda

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Session Overview
Session 04: PCMs used in buildings
Wednesday, 25/Aug/2021:
10:30am - 11:15am

Session Chair: Prof. Umberto Berardi, Ryerson University
Location: Room 4 - Room 015, Building: 116

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10:30am - 10:45am

Impact of Phase Change Material (PCM) Glazing on the Energy Consumption and Solar Radiation Transmission in an Office Room Located in a Semiarid Climate: Analysis of a Real-Scale Experiment

Daniel Uribe1,2, Sergio Vera1,2

1Department of Construction Engineering and Management, School of Engineering, Pontificia Universidad Católica de Chile, Chile; 2Center for Sustainable Urban Development, Pontificia Universidad Católica de Chile, Chile

Phase Change Materials (PCMs) are materials with high latent heat that solidifying at a certain temperature. When PCMs are incorporated into the glazing façade of buildings are able to reduce cooling loads, control daylight transmission and overheating. Currently, office buildings have a fully-glazed façade without opaque elements, so they have a lack of thermal inertia. PCM glazing arises as a solution to improve the thermal performance of the façade. To guarantee the maximum potential of PCM glazing, the phase change must occur during whole work hours. Semiarid climates (Bsk according to Köppen-Geiger climate classification) are characterized by high temperature and solar radiation during more than half of the months of the year, and high fluctuation temperature between day and night; thereby this type of climate is appropriate to get the maximum potential of PCM glazing. Then, the aim of this paper is to analyze the energy performance of an office room with a PCM glazing in comparison with a room with a double-clear glazing. A real-scale experiment was carried out for a year in two office rooms located in Santiago of Chile. The PCM glazing contains paraffin RT25 of Rubitherm® as PCM. company and the reference room have a double-clear glazing filled with air. The analyses include energy consumption of the HVAC system to keep the interior temperature of the room in the comfort range and the solar radiation transmitted to the room. Results present an analysis of three representative weeks of summer, mid-season and winter. An important reduction of the solar radiation transmitted in the PCM glazing in respect to the double-clear glazing, even when the paraffin is in the liquid state most of the day. Moreover, energy savings vary from 10% to 32% depending on the season of the year.

10:45am - 11:00am

Characterization of application-sized PCM for incorporation in radiant ceiling panels: Calorimetric measurements and dynamic thermal behavior

Andres Gallardo, Umberto Berardi

Ryerson University, Canada

This paper focuses on the characterization of an application-sized phase change material (PCM) for incorporation in radiant ceiling panels (RCP) for colling and heating of buildings. The development of an RCP with incorporated PCM aims to encourage the application of high thermal mass radiant systems in existing buildings as a replacement of the traditional all-air HVAC system, which can be regarded as ineffective, inefficient, and expensive.

First, a heat flow meter (HFM) is used to perform enthalpy measurements at a material-scale (PCM cassette). Then, a small test chamber is constructed to measure the dynamic thermal performance of an RCP with PCM under well known and realistic boundary conditions. A known thermal resistance is used to establish a realistic heat transfer coefficient between room air (represented by the temperature of a temperature-controlled metal plate) and ceiling.

From the results, it can be concluded that an HFM can be used to get enthalpy measurements of application-sized PCM as measurements are within +- 5% of literature values. The results also show that the test chamber used for measuring the dynamic thermal behavior of an RCP with PCM can be helpful during the product optimization phase, as many conditions and sample configurations can be tested without expending too much time or money on test rooms or real building monitoring.

11:00am - 11:15am

Thermal behavior of light earth used for building insulation: Insight on PCM introduction impact

Farjallah Alassaad1, Karim Touati1, Daniel Levacher2, Nassim Sebaibi1

1COMUE NU, Laboratoire de Recherche, ESITC Caen, 1 Rue Pierre et Marie Curie, 14610, Epron, France; 2M2C UMR 6143 CNRS, Unicaen, ComUE Normandie Université, 24 rue des Tilleuls, 14000 Caen, France

To reduce building sector significant contribution to greenhouse gas emissions, architects and engineers are seeking ecofriendly construction solutions. Among the explored options, buildings thermal insulation and heat storage can be cited. In the context of sustainable development, a lot of research are focused on the development of new and innovative building materials that are energy efficient with a low environmental impact. This represents a real challenge for researchers.

In this sense, soil-vegetal fibers mixtures and especially cob are attracting a particular interest. This ancient construction technique is widespread across the world. These last years, there is a renewed interest in these environmentally friendly building materials and techniques. This is due to many advantages that they present: excellent humidity regulation ability and high thermal inertia. However, there large-scale deployment, while respecting the local thermal regulations, remains limited due to the walls large thicknesses.

The present study aims to improve light earth thermal properties in order to reduce the buildings thicknesses. The work targets the development of an insulating and heat storing material. To achieve this, phase change materials (PCM) are incorporated in soil-fiber mixtures. PCM arouses a keen interest for building applications because of their ability to store thermal energy.

In the proposed investigation, different samples are first prepared. Then, thermal characterization were conducted in order to understand the impact of PCM on the light earth thermal insulating and storing properties. The incorporation of PCM showed an interesting improvement of the light earth thermal properties: thermal conductivity, specific heat capacity and thermal comfort time.

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