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. 2023 Mar 16;16(6):2382.
doi: 10.3390/ma16062382.

Investigating the Efficiency of a Heat Recovery-Storage System Using Heat Pipes and Phase Change Materials

Robert Stefan Vizitiu  1 , Andrei Burlacu  1 , Chérifa Abid  2 , Marius Costel Balan  1 , Stefanica Eliza Vizitiu  1 , Marius Branoaea  1 , Nicoleta Elena Kaba  3
Affiliations

Investigating the Efficiency of a Heat Recovery-Storage System Using Heat Pipes and Phase Change Materials

Robert Stefan Vizitiu et al. Materials (Basel). .

Abstract

This study presents an experimental and numerical investigation into the efficiency of a two-stage heat recovery-storage system for reducing the thermal energy losses in the industry. The system is designed to recover and store waste thermal energy from residual fluids using heat pipes for recovery and an environmentally friendly phase change material for heat storage. Experimental investigation was conducted using water as the primary agent and varying the temperature between 60 °C, 65 °C, and 70 °C at a constant flow rate of 24 L/min. The secondary agent, also water, was used at an initial temperature of 10 °C and the flow rate was varied between 1 L/min, 2 L/min, and 3 L/min. The results show that the system had a peak efficiency of 78.1% and was able to recover a significant amount of thermal energy. This study demonstrates the potential of this system to reduce the thermal energy losses in the industry and highlight the importance of further research and development in this field, as the industry is responsible for approximately 14% of the total thermal energy losses and finding efficient ways to recover and store waste thermal energy is crucial to achieving sustainable energy consumption.

Keywords: PCM; heat pipe; heat recovery; heat storage.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
The design of the water–water heat exchanger (heat exchanger A).
Figure 2
Figure 2
The design of the PCM heat exchanger (heat exchanger B).
Figure 3
Figure 3
Photo of the experimental stand.
Figure 4
Figure 4
Schematic diagram of the 2-stage heat recovery–storage system.
Figure 5
Figure 5
The stages of the tests.
Figure 6
Figure 6
Meshing—2-stage heat recovery–storage system.
Figure 7
Figure 7
Average and maximum temperatures obtained.
Figure 8
Figure 8
The results for tests 1, 2, and 3.
Figure 9
Figure 9
The results for tests 4, 5, and 6.
Figure 10
Figure 10
The results for tests 7, 8, and 9.
Figure 11
Figure 11
Comparison between the experimental and numerical results.
Figure 12
Figure 12
Three-dimensional temperature contours for tests 7, 8, and 9.
Figure 13
Figure 13
The efficiency of the 2-stage heat recovery–storage system.
See this image and copyright information in PMC

References

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