Hybrid thermal storage using coil-encapsulated phase change materials

Underwood, C.P., Shepherd, T., Bull, S.J. and Joyce, S. (2018) Hybrid thermal storage using coil-encapsulated phase change materials. Energy and Buildings, 159. pp. 357-369. ISSN 0378-7788

Underwood_et_al_2018 Hybrid thermal storage.pdf - Accepted Version
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Official URL: https://doi.org/10.1016/j.enbuild.2017.10.095


Compact thermal storage using a hybrid phase change material (PCM) store for domestic heating applications is investigated. The primary focus is on thermal demand during the electrical grid-stress period (16:00 h–20:00 h on winter weekdays) when the primary heat source, a heat pump, is turned off. Though this phenomenon may be evident in other countries, the main focus of this work is on electrical grid-stress in UK conditions. In this work, PCM encapsulated in pipe coils surrounded by water in a hot water storage tank is considered. Two alternative samples of salt hydrate are evaluated experimentally and the results are used to inform system modelling. A new model is proposed for relating the enthalpy and temperature of the PCM during melting and solidification. A compact hybrid store design is proposed and a detailed thermal model of the hybrid store with an air-source heat pump is constructed and applied to an example house. Seasonal energy results compared with a conventional water tank are broadly similar but the hybrid store offers better comfort tracking during grid stress periods – average house temperatures falling below 19 °C for 22.7% of the time with a conventional store but only 5.8% of the time using the hybrid store.

Item Type: Article
Uncontrolled Keywords: Phase change material, PCM, Thermal storage, Heat storage, Air-source heat pump, Domestic heating, Grid-stress
Subjects: H300 Mechanical Engineering
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Elena Carlaw
Date Deposited: 06 Mar 2019 16:34
Last Modified: 01 Aug 2021 12:45
URI: http://nrl.northumbria.ac.uk/id/eprint/38319

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