Hybrid thermal storage using coil-encapsulated phase change materials

Underwood, Chris; Shepherd, T.; Bull, Steve; Joyce, Sharon

doi:10.1016/j.enbuild.2017.10.095

Cited by 16 publications

(8 citation statements)

References 23 publications

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“…In the wall sub-model, the heat flows in the peripheral direction between the adjacent wall elements are also taken into account. Assuming an isotropic material, the corresponding thermal resistance R W1 ,j is calculated with Equation (5).…”

Section: Wall and Heat Resistor Sub-modelmentioning

confidence: 99%

Modeling of a Hybrid Steam Storage and Validation with an Industrial Ruths Steam Storage Line

Dusek

Hofmann

2019

Energies

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Phase change materials are used in latent heat thermal energy storages to store a high amount of energy during phase change. A hybrid storage concept was developed with the aim of utilizing this high storage capacity in combination with Ruths steam storages. In the concept, a container filled with phase change material is placed at the shell surface of the Ruths steam storage. This container can be divided into several chambers filled with different phase change materials. An arrangement of electrical heating elements or heat exchangers at the internal side of these chambers is also provided. In this paper, a model of the hybrid storage concept is developed. The model consists of different sub-models, which are connected to each other. The simulation results of a hybrid storage show how important the model is for the analysis of the concept. Furthermore, the validation of the Ruths steam storage sub-model with operational measurement data of a storage line is presented. A maximum deviation between the operational measurement data and the simulation results of 6.43% occurs in terms of pressure at the internal side of the pressure vessel. In addition, the latent heat thermal energy storage sub-model was checked with the analytic solution.

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Section: Wall and Heat Resistor Sub-modelmentioning

confidence: 99%

Modeling of a Hybrid Steam Storage and Validation with an Industrial Ruths Steam Storage Line

Dusek

Hofmann

2019

Energies

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“…The tank is designed so that it will fit into a standard kitchen under-bench module in a residential application. Full details of the modelling methods used and parameter and input data sets can be found in Underwood et al (2018).…”

Section: Case Study 2: Heat Pump Coupled To a Hybrid Thermal Storementioning

confidence: 99%

“…This is significant because a modern well-insulated house of medium size will have a space heating design load of, typically, 4-5kW in the UK (as an example). This means that the hybrid tank would be able to satisfy heating demand during the crucial electrical grid-stress phase in later afternoon/early evening (Underwood et al, 2018). The heating spike at the start of discharge is due to cold heating system water initially displacing warm tank water and once the heating system water catches up, this spike quickly settles down to the nominal heating system output value.…”

Section: Case Study 2: Heat Pump Coupled To a Hybrid Thermal Storementioning

confidence: 99%

Modelling HVAC and renewable energy plant and control

Underwood¹,

Rees²

2019

Building Performance Simulation for Design and Operation

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The chapter firstly presents an introduction to modern approaches to both steadystate and dynamic modelling of HVAC and related plant components and systems. Approaches to representations of components such as waterair heat exchangers are dealt with along with their representation in systems that include control elements are described. Common approaches to solving the resulting equations are also presented. A series of simulation casestudies are provided to illustrate the application of the methods. The chapter also presents examples of approaches to modelling the key components of a number of renewable energy systems that can be found integrated in buildings. Learning outcomes To be able to describe approaches to the modelling of HVAC, plant and renewable energy systems and their key components and how they can be represented mathematically and possible solution approaches. To be able to describe the data requirements of such modelling approaches and to execute calculations to find the state of example component models.

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“…Solid-liquid phase change materials (PCMs) have been widely used in latent heat thermal storage systems for heat pumps [1][2][3], solar engineering [4], and spacecraft thermal control [5]. A simple and common application of PCM can be seen in thermally insulated water bottles, where the PCM surrounded by water melts and is used to store the heat from the hot water.…”

Section: Introductionmentioning

confidence: 99%

“…The well-known PCM paraffin wax (327204 Aldrich) having a melting point between 53°C-57°C is used in this experiment as the host material because of its low cost and availability. In future, the proposed sensor can be used as a cheaper alternate for real time phase state monitoring of other PCM, such as paraffin/polyethylene blend [31], polyethylene/paraffin blend [32] and erythritol [3], etc used in thermal storage system.…”

Section: Introductionmentioning

confidence: 99%

Optical fibre sensors for monitoring phase transitions in phase changing materials

Kumar¹,

Han²,

Liu³

et al. 2018

Smart Mater. Struct.

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A platinum coated singlemode-multimode (SM) structure is investigated in this paper as an optical fibre sensor (OFS) to monitor the phase transition of a phase change material (PCM). Paraffin wax has been used as an example to demonstrate the sensor's performance and operation. Most materials have the same temperature but different thermal energy levels during the phase change process, therefore, sole dependency on temperature measurement may lead to an incorrect estimation of the stored energy in PCM. The output spectrum of the reflected light from the OFS is very sensitive to the bend introduced by the PCM where both liquid and solid states exist during the phase transition. The measurement of strain experienced by the OFS during the phase change of the PCM is utilized for identifying the phase transition of paraffin wax between the solid and liquid states. The experimental results presented in this paper show that the OFS with a shorter multimode fibre section has better performance for monitoring the phase transition of paraffin wax with a measured phase transition temperature range of 41.5°C-57.7°C for the SM based OFS with a 5 mm long multimode fibre section.

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Hybrid thermal storage using coil-encapsulated phase change materials

Abstract: This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International licence Newcastle University ePrints -eprint.ncl.ac.uk Underwood CP, Shepherd T, Bull SJ, Joyce S. Hybrid thermal storage using coil-encapsulated phase change materials.

Cited by 16 publications

References 23 publications

Modeling of a Hybrid Steam Storage and Validation with an Industrial Ruths Steam Storage Line

Modeling of a Hybrid Steam Storage and Validation with an Industrial Ruths Steam Storage Line

Modelling HVAC and renewable energy plant and control

Optical fibre sensors for monitoring phase transitions in phase changing materials

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