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Effect of input parameters on energy requirements of phase change material integrated local heating system: a case study

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Abstract

The space heating in residential buildings during winters account for a considerable amount of conventional or high-grade electrical energy. Therefore, improving the performance of space heating systems with the inclusion of renewable energy sources like solar becomes crucial in order to have better occupant’s comfort while reducing energy use. Phase change material (PCM) is one of the best solutions for the storage of renewable thermal energy, especially solar, which are intermittently available. PCM stores energy when surplus energy is available and deliver whenever it is required. It can be integrated with the system for energy storage as well as availing heat at a constant temperature. The present study will try to demonstrate the energy-saving by implementing the local heating with a spiral latent heat thermal energy storage system, when only a particular (local) space heating is of interest. In this work, an experimental, as well as the numerical studies of a dome over a bed were performed. Various heating coil configurations, namely floor coil, roof zig-zag, and roof spiral, were constructed to find the best configuration for the localized space heating. Experiments and simulations with the variable flow rate (0.25, 0.50, and 0.75 m/s) and varying inlet temperatures (55, 60, and 65 °C) of the heat transfer fluid were carried out. It was found that the floor coil heating gives better results as compared with the other two. It was also seen that the effect of mass flow rate and inlet temperature was not that much significant after a limit. A temperature difference of 20 °C was maintained between the space under consideration with the surrounding room.

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Data availability

All data pertaining to this research work is available in the manuscript.

Abbreviations

CFD:

Computational Fluid Dynamics

HEX:

Heat Exchanger

HTF :

Heat Transfer Fluid

LHTESS:

Latent Heat Thermal Energy Storage System

PCM:

Phase Change Material

ETC:

Evacuated Tube Collector

C p :

Specific heat capacity at constant pressure (J/kg.K)

h :

Enthalpy (J/kg)

k :

Thermal conductivity (W/m.K)

p :

Pressure (N/m2)

S :

Source (J)

T :

Temperature (K)

U :

Velocity (m/s)

α :

Volumetric expansion coefficient (1/K)

μ :

Dynamic viscosity (Pa·s)

ρ :

Density (kg/m3)

τ :

Shear stress (N/m2)

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Acknowledgements

Authors acknowledge the financial support provided by the Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Govt. of India, through grant ECR/2015/00526, and project titled ‘Solar Energy Storage Using Phase Change Materials for Space Heating Applications’.

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Authors and Affiliations

  1. School of Mechanical and Material Engineering, Indian Institute of Technology Mandi, Himachal Pradesh, Mandi, India, 175075

    Pushpendra Kumar Shukla & P. Anil Kishan

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  1. Pushpendra Kumar Shukla
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Contributions

Pushpendra Kumar Shukla: Conceptualization, Methodology, Experiments, Simulations, Writing—original draft, Data curation, Investigation. P. Anil Kishan: Conceptualization, Supervision, Writing—review & editing.

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Correspondence to Pushpendra Kumar Shukla.

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Shukla, P.K., Kishan, P.A. Effect of input parameters on energy requirements of phase change material integrated local heating system: a case study. Heat Mass Transfer (2022). https://doi.org/10.1007/s00231-022-03321-z

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