Evaluation of the Energy-Saving Performance of Heat-Resistant Paint
Takashi Oda,
Kimihiro Yamanaka,
Mitsuyuki Kawakami
Issue:
Volume 2, Issue 5, October 2014
Pages:
53-57
Received:
10 September 2014
Accepted:
27 September 2014
Published:
20 October 2014
Abstract: We developed an empirical quantitative evaluation of the energy-saving performance of heat-resistant paint in winter. Specifically, heat-resistant paint and conventional wall paint were applied to steel boxes placed in a room kept at constant temperature and humidity, after which heat sources were placed in the boxes and the energy-saving performance of each type of paint was evaluated from the change in temperature at the box walls and inside the boxes. The experimental results show that the heat-resistant paint reduced the amount of heat escaping through the walls, and it can thus be expected to reduce heat loss. Furthermore, in the case of the heat-resistant paint, the amount of heat passing through the walls was 16% less than that in the case of the conventional paint. The conduction heat flux for the box with ceramic insulating paint was less than that for other boxes. It is thus thought that the thermal resistance of the ceramic insulation paint is higher than that of the other paints. We estimated the thermal resistance of each paint and found that thermal resistance of ceramic insulating paint was 12.4 times that of conventional energy-saving paint and twice that of high-reflectance paint.
Abstract: We developed an empirical quantitative evaluation of the energy-saving performance of heat-resistant paint in winter. Specifically, heat-resistant paint and conventional wall paint were applied to steel boxes placed in a room kept at constant temperature and humidity, after which heat sources were placed in the boxes and the energy-saving performan...
Show More
Numerical Analysis of the Thermal Behaviour of a Photovoltaic Panel Coupled with Phase Change Material
G. Santiago-Rosas,
M. Flores-Domínguez,
J. P. Nadeau
Issue:
Volume 2, Issue 5, October 2014
Pages:
58-64
Received:
7 November 2014
Accepted:
12 November 2014
Published:
17 November 2014
Abstract: Elevated operating temperatures reduce the solar to electrical conversion efficiency of photovoltaic devices. In this paper, a numerical study is conducted to understand the thermal behavior of a photovoltaic panel with phase change materials. The analysis of the PV/PCM system was realized in three phases: temperature rise, start of melting of PCM and molten PCM so, three mathematical models for the resolution of thermal model of PV/PCM system during the solar insolation were used. First, an analytical model was used to study the behavior of PCM in state solid, after, an explicit and an implicit model were used to study globally the transfers. Different simplifications are introduced in the heat balances to realize a simple numerical approach. The Matlab software was used to solve different proposed models in this analysis. The results obtained are considered as a first approach to the study of a PV/PCM system.
Abstract: Elevated operating temperatures reduce the solar to electrical conversion efficiency of photovoltaic devices. In this paper, a numerical study is conducted to understand the thermal behavior of a photovoltaic panel with phase change materials. The analysis of the PV/PCM system was realized in three phases: temperature rise, start of melting of PCM ...
Show More
