Stability and Heat storage Capacity of Phase Change Emulsion Paraffin/Water

doi:10.11901/1005.3093.2016.751

Chinese Journal of Materials Research

2017, Vol. 31

Issue (10): 789-795 DOI: 10.11901/1005.3093.2016.751

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Stability and Heat storage Capacity of Phase Change Emulsion Paraffin/Water

Li HUANG(

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Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo 315211, China

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Li HUANG. Stability and Heat storage Capacity of Phase Change Emulsion Paraffin/Water. Chinese Journal of Materials Research, 2017, 31(10): 789-795.

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Abstract

A test rig has been built to investigate the heat capacity of emulsions of paraffin/ water as well as their stability by pumping circulation. The results show that the emulsion kept at an appropriate level of stability and heat capacity during the desired storage period. However, the stability by pumping circulation depends largely on the phase change temperature of the used paraffin. The heat capacity of the emulsion is the sum of the sensible heat capacity of water and the sensible and latent heat capacity of paraffin. In the typical temperature range of 5°C to 11°C for cold supply networks, the emulsion has a heat capacity of 56 kJ/kg, which is twice as high as that of simple water.

Key words: foundational discipline in materials science phase change emulsion heat capacity phase change material (PCM)

Received: 22 December 2016

ZTFLH:

TB34

Fund: Supported by National Natural Science Foundation of China (No.51406092), National Natural Science Foundation of Ningbo (No.2015A610101)

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.751 OR https://www.cjmr.org/EN/Y2017/V31/I10/789

Fig.1 Illustration and photo of a paraffin/water emulsion

Fig.2 Photo and the instrumentation diagram of the test rig

Fig.3 Thermodynamic system for determining the heat capacity of the emulsion

Fig.4 Droplet size distribution of the emulsion after the emulsification and after 28 months of storage

Fig.5 DSC curves of the emulsion after the emulsification and after 28 months of storage

Fig.6 Droplet size distribution of the emulsion with a melting point of 10℃ before, during and after the test

Fig.7 DSC curves of the emulsion with a melting point of 10℃ before and after the test

Fig.8 Droplet size distribution of the emulsion with a melting point of 20℃ before, during and after the test

Fig.9 Heat flow of the primary fluid and the water temperatures measured and calculated according to Equation (5) during the cooling process

Fig.10 Heat flow of the primary fluid and the water temperatures measured and calculated according to Equation (5) during the heating process

Fig.11 Heat capacity of water experimentally determined compared to that calculated according to Equation (6) versus temperature

Fig.12 Total heat capacity of the emulsion compared to water during the discharging process

Fig.13 Total heat capacity of the emulsion compared to water during the charging process

Fig.14 Total heat capacity of the emulsion experimentally determined with the test rig and calculated according to Equation (6) versus temperature during the discharging and charging processes

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