Abstract
General cool roof is effective for reduction of cooling load, but it has a problem of increasing heating load. Therefore, the purpose of this study is to complement the disadvantages of the cool roof system by utilizing phase change characteristics of phase change material (PCM). The study was carried out to verify the thermal performance of the PCM cool roof system by measuring the temperature on the top and bottom of the PCM cool roof system by making a miniature model (600 × 600 × 600 mm). PCM was inserted and not inserted, and the temperature difference according to the finish color (brown and white) was compared. As a result, the plate surface temperature using PCM was lower than that without PCM, and time-lag of temperature increase occurred. As a result of the comparison of temperature according to the finish color (brown and white), white showed a low temperature distribution up to 16.35°C. Even at room temperature, white maintained a low temperature distribution of 5.40°C than brown. The use of PCM cool roof system in roof finishes could lower the surface temperature and keep the room temperature low.
Highlights
A cool roof can increase the reflectivity and emissivity of a roof’s surface, which results in a lower surface temperature compared to general roof finishes
A phase-change cool roof can prevent over-heating of the roof surface during summer and without increasing the heating load in winter. e decreased variation in the indoor temperature can make occupants feel more comfortable throughout the year. is study demonstrates the improvements in energy savings and comfort using a phase change material (PCM) cool roof system
Fabrication of wood plastic composite (WPC) and Packing-Type PCM. e WPC was rst utilized to apply the PCM to the roof layer. e WPC consisted of a lower bottom plate, an internal hollow layer containing PCM, and an upper surface cover used as an exterior material. e plate was designed to have modular size for application in various areas. e thermal conductivity of the WPC plate was measured using a thermal conductivity analyzer (TCi), which measures the degree to which a given amount of heat is supplied to the object and its thermal energy raises the temperature. e mean value calculated from 10 measurements with the hollow layer included was 0.53 W/m·K (Table 1)
Summary
A cool roof can increase the reflectivity and emissivity of a roof’s surface, which results in a lower surface temperature compared to general roof finishes. Cool roofs are effective at cooling in the summer because they minimize the solar heat gain on the roof. They increase the heating load in winter [1]. One solution is to apply phase-change materials (PCMs) to cool roofs [2,3,4,5,6,7,8,9]. A PCM can change phase from solid to liquid or liquid to solid at different temperatures. A phase-change cool roof can prevent over-heating of the roof surface during summer and without increasing the heating load in winter. Is study demonstrates the improvements in energy savings and comfort using a PCM cool roof system A phase-change cool roof can prevent over-heating of the roof surface during summer and without increasing the heating load in winter. e decreased variation in the indoor temperature can make occupants feel more comfortable throughout the year. is study demonstrates the improvements in energy savings and comfort using a PCM cool roof system
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