Characteristics optimization of composite phase-change wall during intermittent heating process

The indoor thermal environment under an intermittent heating condition can be maintained by rationally utilizing the heat storage and release processes of the composite phase-change wall (composite-PCW), leading to heating time and energy consumption reductions. In order to optimize its heat storage...

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Published in:	HVAC&R research Vol. 26; no. 4; pp. 541 - 551
Main Authors:	Li, Yanru, Long, Enshen, Ding, Pei, Guo, Shurui
Format:	Journal Article
Language:	English
Published:	Philadelphia Taylor & Francis 20-04-2020 Taylor & Francis Ltd
Subjects:	Energy consumption Energy storage Heat conductivity Heat loss Heat storage Heat transfer Heating Indoor environments Latent heat Optimization Phase change materials Phase transitions Thermal conductivity Thermal environments Transition temperature
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Abstract	The indoor thermal environment under an intermittent heating condition can be maintained by rationally utilizing the heat storage and release processes of the composite phase-change wall (composite-PCW), leading to heating time and energy consumption reductions. In order to optimize its heat storage and release processes, the influences of different parameters on the dynamic thermal processes of composite-PCW were studied, including the position and thickness of phase-change material (PCM), phase transition temperature, phase-change latent heat, and PCM thermal conductivity, according to two typical intermittent conditions summarized by experimental data. With large heat storage efficiency η and small heat loss rate ε, the optimized composite-PCW that was adaptive for intermittent heating was the composite-PCW with 10 mm PCM integrated to the wall inside. Its phase-transition temperature was 19-20 °C (66.2-68 °F), the phase-change latent heat was 220 kJ/kg (95.58 btu/lb), and the thermal conductivity was 0.4 W/(m·K) (0.23 btu/(ft·h·°F)) at liquid states and 0.8 W/(m·K) (0.46 btu/(ft·h·°F)) at solid states.
AbstractList	The indoor thermal environment under an intermittent heating condition can be maintained by rationally utilizing the heat storage and release processes of the composite phase-change wall (composite-PCW), leading to heating time and energy consumption reductions. In order to optimize its heat storage and release processes, the influences of different parameters on the dynamic thermal processes of composite-PCW were studied, including the position and thickness of phase-change material (PCM), phase transition temperature, phase-change latent heat, and PCM thermal conductivity, according to two typical intermittent conditions summarized by experimental data. With large heat storage efficiency η and small heat loss rate ε, the optimized composite-PCW that was adaptive for intermittent heating was the composite-PCW with 10 mm PCM integrated to the wall inside. Its phase-transition temperature was 19–20 °C (66.2–68 °F), the phase-change latent heat was 220 kJ/kg (95.58 btu/lb), and the thermal conductivity was 0.4 W/(m·K) (0.23 btu/(ft·h·°F)) at liquid states and 0.8 W/(m·K) (0.46 btu/(ft·h·°F)) at solid states.
Author	Guo, Shurui Long, Enshen Li, Yanru Ding, Pei
Author_xml	– sequence: 1 givenname: Yanru surname: Li fullname: Li, Yanru organization: College of Architecture and Environment, Sichuan University – sequence: 2 givenname: Enshen surname: Long fullname: Long, Enshen email: longes2@163.com organization: Institute of Disaster Management and Reconstruction, Sichuan University-Hong Kong PolyU – sequence: 3 givenname: Pei surname: Ding fullname: Ding, Pei organization: Institute of Disaster Management and Reconstruction, Sichuan University-Hong Kong PolyU – sequence: 4 givenname: Shurui surname: Guo fullname: Guo, Shurui organization: College of Architecture and Environment, Sichuan University
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SubjectTerms	Energy consumption Energy storage Heat conductivity Heat loss Heat storage Heat transfer Heating Indoor environments Latent heat Optimization Phase change materials Phase transitions Thermal conductivity Thermal environments Transition temperature
Title	Characteristics optimization of composite phase-change wall during intermittent heating process
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