The application of a validated numerical model to predict the energy conservation potential of using phase change materials in the fabric of a building

2006 ◽  
Vol 90 (13) ◽  
pp. 1951-1960 ◽  
Author(s):  
M HUANG ◽  
P EAMES ◽  
N HEWITT
Keyword(s):  
Numerical Model ◽  
Energy Conservation ◽  
Phase Change ◽  
Phase Change Materials

Application of Low-Temperature Phase Change Materials to Enable the Cold Weather Operability of B100 Biodiesel in Diesel Trucks

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Obiajulu J. Nnaemeka ◽  
Eric L. Bibeau
Keyword(s):  
Numerical Model ◽  
Phase Change ◽  
Canola Oil ◽  
Phase Change Materials ◽  
Cold Weather ◽  
Test Fluid ◽  
Transient Temperature ◽  
Temperature Phase ◽  
Scaled Model ◽  
Diesel Trucks

The use of B100 biodiesel for compression ignition engines during the winter poses a challenge due to gelling and plugging of engine filters and fuel lines. The most common method to prevent this issue is blending it with petroleum diesel and many engine manufacturers limit the biodiesel in blends to 20% or less for warrantee purposes; as low as 5% may be set for winter months. In this research, an experimental analysis is performed using a scaled model of the fuel tank with canola oil as a test fluid in the tank. An insulated tank is subjected to an ambient temperature of −20 °C in an icing tunnel facility with air velocity at 10 m/s. The results show that the time for the oil to drop from 20 °C to 5 °C was increased from 18.6 h to 22.5 and 33 h, respectively, when 4 and 12 tubes containing phase change materials (PCM) were inserted in the tank containing 33 l of canola oil. A numerical model was further formulated to predict the transient temperature of the oil and comparison with experimental results showed excellent agreement. Finally, the developed numerical model was used to simulate different designs to investigate the effect of tank filling level, overall heat transfer coefficient, number of PCM modules, and diameter of PCM modules on the tank performance. The results show that B100 can be implemented in diesel engines in cold climates using a passive approach using engine coolant.

Mathematical Modeling and Experimental Study on Building Ceiling System Incorporating Phase Change Material (PCM) for Energy Conservation

2006 ◽  
Author(s):  
A. Pasupathy ◽  
R. Velraj
Keyword(s):  
Energy Conservation ◽  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Supply And Demand ◽  
Eutectic Mixture ◽  
Thermal Storage ◽  
Material System ◽  
Reference Case ◽  
Change Material

Thermal storage plays a major role in a wide variety of industrial, commercial and residential application when there is a mismatch between the supply and demand of energy. Several promising developments are taking place in the field of thermal storage using phase change materials (PCM) in buildings. In the present paper, a detailed study of the thermal performance of a phase change material system for energy conservation in building is analyzed and discussed. An experiment consisting of two identical test houses has been constructed to study the effect of having PCM panel on the roof of the building. One house is constructed without PCM on the room in order to provide a reference case for comparison with the experimental house that includes the phase change material. The PCM is an inorganic eutectic mixture, which has melting temperature in the range of 26 - 28°C. A mathematical model has been developed in which finite volume method is used to predict the thermal behavior of the ceiling system incorporating PCMs. A comparison with the experimental results is also made.

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