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Energies 2017, 10(10), 1662; doi:10.3390/en10101662

The Heat Transfer of Microencapsulated Phase Change Material Slurry and Its Thermal Energy Storage Performance of Combined Heat and Power Generating Units

1
Key Laboratory of Condition Monitoring and Control for Power Plant Equipment (North China Electric Power University), Ministry of Education, Beijing 102206, China
2
Northeast Electric Power Design Institute Co., Ltd of China Power Engineering Consulting Group, Changchun 13002, China
*
Author to whom correspondence should be addressed.
Received: 10 September 2017 / Revised: 14 October 2017 / Accepted: 16 October 2017 / Published: 20 October 2017
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Abstract

The application of thermal energy storage (TES) is an effective way of improving the power load regulation capability of combined heat and power (CHP) generating units. In this paper, a theoretical investigation on the thermal energy storage system of a CHP unit that employs the microencapsulated phase change material slurry (MPCMS) as the working fluid is carried out. The results indicate that the microcapsule particle internal melting rate is progressively small; 90% latent heat can be absorbed in 63% total melting time. The melting time of particles in micron is very short, and the diameter is an important factor for microcapsule melting. For the MPCMS flow in a circular tube, the temperature distribution between laminar flows and turbulent flows is different. In a turbulent flow, there is an approximate isothermal section along the tube, which cannot be found in a laminar flow. Additionally, a thermal storage system with MPCMS as heat transfer fluid for a CHP unit is proposed. A case study for a 300 MW CHP unit found that the use of an MPSMS thermal energy storage system increases the power peak shaving capacity by 81.4%. This indicates that the thermal storage system increases the peak shaving capacity of cogeneration units. View Full-Text
Keywords: microencapsulated phase change slurry; combined heat and power generation; thermal energy storage; power load regulation microencapsulated phase change slurry; combined heat and power generation; thermal energy storage; power load regulation
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Guo, Y.; Zhang, X.; Yang, L.; Xu, C.; Du, X. The Heat Transfer of Microencapsulated Phase Change Material Slurry and Its Thermal Energy Storage Performance of Combined Heat and Power Generating Units. Energies 2017, 10, 1662.

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