Thermo properties of quaternary molten salt heat transfer fluid for heat recovery system
In the context of the heat recovery system, the application of heat transfer fluid is one of the essential factors that can improve the efficiency of the system. According to the previous research, quaternary molten nitrate salt mixture has been proved to be an excellent heat transfer fluid in...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2020
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/1033/1/24p%20MOHD%20FAIZAL%20TUKIMON.pdf http://eprints.uthm.edu.my/1033/2/MOHD%20FAIZAL%20TUKIMON%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1033/3/MOHD%20FAIZAL%20TUKIMON%20WATERMARK.pdf |
| Summary: | In the context of the heat recovery system, the application of heat transfer fluid is one
of the essential factors that can improve the efficiency of the system. According to the
previous research, quaternary molten nitrate salt mixture has been proved to be an
excellent heat transfer fluid in the heat recovery system. The objective of this study is
to determine the formulation of quaternary molten nitrate salt mixture that has high
heat capacity (Cp) with a low melting point. Besides that, the thermal properties and
the heat transfer rate of the formulation have been determined through several testing.
As for the methodology, the formulation of quaternary molten nitrate salt has been
mixed and dried at 100oC for 24 hours to homogenize the mixture. At the beginning
of the heating process, the mixture was heated up to 150oC and had been remained
constant for four hours. Then, the temperature has risen up to 400oC. The mixing was
done as the mixtures were cooled until it reached room temperature. From the result
of DSC testing, the melting point for Sample 5 with a composition of 10wt% LiNO3 +
10wt% NaNO3 + 40wt% KNO3 + 40wt% Ca(NO3)2) has been verified to be below
100oC, which was 97.71oC with the highest heat capacity of 0.46J/goC. From TGA
testing, the liquidus temperature and maximum thermal stability temperature of
Sample 5 were detected at the temperature of 36.03
oC and 439.04oC respectively. For
the heat transfer performance test, during the “Heater on” condition, it is shown that
as the range of flow rate increased, the heat transfer rate has increased for all setting
temperatures. As for the “Heater off” condition, Sample 5 has lost the least heat to the
surrounding compared to other selected samples. In conclusion, Sample 5 with a
composition of (10wt% LiNO3 + 10wt% NaNO3 + 40wt% KNO3 + 40wt% Ca(NO3)2)
has been identified as an excellent formulation of quaternary molten nitrate salt that
has potential to act as heat transfer fluid in the heat recovery system. |
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