PCM experimental Report
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This document summarizes an experimental investigation of the thermal behavior of phase change materials (PCM) under dynamic thermal effects. The experiments were carried out using two identical boxes called MICROBAT, with one box having PCM-covered walls. The results showed that the heat storage of the PCM-covered walls effectively stabilized the internal environment when subjected to changing external temperatures, demonstrating the potential of PCM to improve thermal comfort in buildings while reducing energy consumption.
PCM experimental Report
- 1. Thermal Energy Conversion Control Lab. Chonbuk Nat’I Univ. Experimental investigation of thermal behavior of phase change materials under dynamical thermal effects Sudheer Nandi M.Tech,MBA,(Ph.D.) Sustainable Energy . S.korea http://energain.co.uk/Energain/en_GB/assets/downloads/tech_papers/experimental _investigation_of_thermal_behaviour_of_phase_change_materials_under_dynamical _thermal_effects.pdf
- 2. Thermal Energy Conversion Control Lab. Chonbuk Nat’I Univ. 2 HVAC comfort of buildings rose increasingly and then energy consumption is increased, aggravating the pollution of natural environment. Integrating phase change materials (PCM) into building reducing energ y consumption in passively designed buildings. Strong need for experimental data to evaluate the capacity of PCM to stabilize the internal environment when there are external temperature changes product designed by DuPont and the product looks like a flexible panel of 5mm thickness. The experiments have been carried out with two identical boxes called MICROBAT which dimensions are (0.62m, 0.62m, 0.62m). In one of the two boxes, the walls are covered with the PCM product. The internal and external temperatures are measured with radiations shielded thermocouples. The spotlights and the air treatment system are dynamically controlled, allowing us to simulate the external thermal solicitations of a day. The results show that the heat storage of the PCM covered walls effectively stabilizes the internal environ ment. Key words: Phase Change Material, comfort, experiment, thermal dynamical effects. ABSTRACT
- 3. Thermal Energy Conversion Control Lab. Chonbuk Nat’I Univ. AIM OF PAPER • research in efficient solutions succeed quickly in commercial products that will allow e ach to live more comfortably, while consuming less energy and while contributing to t he reduction of emission of C02 gases. • The use of PCM materials in building encapsulation is subject to considerable interest in the last decade, and a bibliographical review can be found in VV .Tyagi and D.Buddhi (2006) http://www.seas.upenn.edu/~meam502/project/reviewexample2.pdf • Main interest is that they can store latent heat energy, as well as sensible energy. 3
- 4. Thermal Energy Conversion Control Lab. Chonbuk Nat’I Univ. • The chemical reaction being endothermic, The PCM absorbs heat. Example : As the temperature increases, the material change phase from solid to liquid. • The reaction being exothermic Example : The temperature decreases, the material change phase from liquid to solid. • The experimental heat capacity measured by differential scanning calorimetric( Which used for measuring Latent heat of a system )and the experimental thermal conductivity. • This product is like a polymeric membrane, relatively flexible, of 5 mm thickness. 4 Technical Data
- 5. Thermal Energy Conversion Control Lab. Chonbuk Nat’I Univ. • The use of PCM in the building is a relatively old concept that could be ever exploited really because of the inherent difficulties of setting such materials. • The novelty in this case is constituted by encapsulation of an important quantity of active matter in a therm oplastic polymer that, after transformation in a relatively thin membrane, permits a practical installation in all type of envelope of the building. 5 Figure 1: Measured PCM material thermal conductivity (left) and heat capacity (right)
- 6. Thermal Energy Conversion Control Lab. Chonbuk Nat’I Univ. • In order to show the efficiency of this PCM made of a 5 mm thickness, we have made a comparative mea surement in two test cells called MICROBAT. Very few experimental data under controlled external conditi ons exist. PRESENTATION OF THE EXPERIMENT • The experiment is composed of two test boxes which name is MICROBAT. The external dimensions of each box are 0.62mx0.62mx0.62m. • The two MICROBAT cells are placed in a climatic chamber where the temperature is dynamically controlle d. Artificial sunning (gas discharge lamps with metal halides which spectrum is similar to the sun one). The two test cells are subject to the same external conditions concerning the temperatures and the radiative fluxes entering via the glass face 6
- 7. Thermal Energy Conversion Control Lab. Chonbuk Nat’I Univ. VV .Tyagi and D.Buddhi (2006) ttp://www.seas.upenn.edu/~meam502/project/reviewexample2.pdf 7
- 8. Thermal Energy Conversion Control Lab. Chonbuk Nat’I Univ. 8 .
- 9. Thermal Energy Conversion Control Lab. Chonbuk Nat’I Univ. EXPERIMENTAL RESULTS 9
- 10. Thermal Energy Conversion Control Lab. Chonbuk Nat’I Univ. 10
- 11. Thermal Energy Conversion Control Lab. Chonbuk Nat’I Univ. References • Tyagi, V.V., and Buddhi, D. (1995). PCM thermal storage in buildings: A state of art. Renewab le and Sustainable Review in press. 11