Location and Thickness Effect of Two Phase Change Materials Between Layers of Roof on Energy Consumption for Air-Conditioned Room

Abstract

Thermal discomfort inside building is due to outside climate, especially by excessive solar radiation during summer or by temperature drop during a cold season. The use of phase change materials (PCMs) can reduce this effect by storing heat transmitted by sensible and latent heat. This ensures good situation of thermal comfort throughout the year. In this work, thermal behavior of two roofing systems is studied. One roof that is taken as reference is constituted by usual materials in building. In the second, two PCMs are inserted according to three configurations. The objective of the study is to assess incorporation effect of two PCMs within reference roof and to evaluate the optimum locations to reduce the energy consumption of air-conditioned room. A monodimensional numerical model, validated analytically and experimentally, is used to carry out a parametric analysis to determine the characteristics of the PCMs to be used and their optimal location within the reference roof regardless of the external climate effect. Numerical calculations are performed for three configurations of roof with swapping PCMs. Results show that insertion of PCMs in the roof provides the best energy consumption saving regardless of annual climate change. Reduction in energy consumption of an air-conditioned room depends on the combination of PCMs, their mutual thicknesses, and thermal comfort level.

Modeling of Multi-Layer Phase Change Material in a Triplex Tube under Various Thermal Boundary Conditions

“…An excellent technique to remediate this defect is using a metal matrix with high thermal conductivity [13][14][15]. Additionally, employing multi-layer PCMs can optimize system performance in certain circumstances [16][17][18].…”

“…Hence, using multi-layer PCMs can lead to energy-efficient systems in certain circumstances. Another numerical study into multi-layer PCM usage in buildings was conducted by Hamza et al [17]. In this study, the arrangement of PCMs was assessed to minimize the wasted energy in an air-conditioned room.…”

Influence of Thermal Insulation’s and Phase Change Material’s Insertion within a Partition Wall on the Energy Consumption of a Conditioned Room under Adjacent Local Periodical Temperature Effect

“…Phase change material is known by its ability to store more energy and temperature fluctuations [6]. The investigation of PCM is made for the case of conditioned local [7,8,9] and non-conditioned local [10]. Criteria of these works are the daily and annually energy per unit area [1,8] or the flux density transmitted to the local [7,11].…”

Preparation and Thermal Properties of Microencapsulated Polyurethane and Double-Component Poly(ethylene glycol) as Phase Change Material for Thermal Energy Storage by Interfacial Polymerization

“…PCMs are the key components of promoting efficient and versatile use of solar energy . Of note, PCMs can absorb or release thermal energy from the environment by phase change process, so as to achieve the purpose of thermal storage, transformation, and regulation …”

“…3 Of note, PCMs can absorb or release thermal energy from the environment by phase change process, so as to achieve the purpose of thermal storage, transformation, and regulation. 4 Among the investigated PCMs, organic solid−liquid PCMs have become the highlights of research, due to their high enthalpy, optional choices of temperature, noncorrosive performance, chemical stability, compatibility, and lower cost. However, a single PCM has only a narrow response range for environmental temperature, and the liquid phase fluidity leads it to leak.…”