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Figure 3 shows the temperature difference between the water supply and the p h e Crystals 2021, 11, 951 from the bed. A sudden drop and increase in the value of the water return tem from the ex-changer is related to the incorrect reading of the measuring system. T age difference in temperature was 1.93 K. This is an acceptable disparity to ensur test accuracy. This can be achieved, for example, by reducing the wate7rofl1o4w thro exchanger. 70 65 60 55 50 45 40 35 30 Figure 3. Temperature difference between the supply and return from the paraffin tank. Figure 3. Temperature difference between the supply and return from the paraffin tank. 3.2. Characterizations of Paraffin Wax Containing Multi-Walled Carbon Nanotube Composites Carbon nanotubes are categorized into single-wall carbon nanotubes (SWCNT) and multi-walled carbon nanotubes (MWCNT), where SWCNTs have been made of monolayer graphene. The dangling bonds are swiftly incorporated on the boundary while winding the graphene layer into a cylinder, resulting in the axis of CNTs becoming randomly dispersed [5]. When the graphite surface area is lined up lengthwise across the SWCNT axis, a two-dimensional geometry such as a graphene surface with a single layer is produced [6]. On the contrary, multi-walled carbon nanotubes have outstanding characteristics (thermal, electrical, and mechanical), which afford a wide range usage potential opportunities [7]. It has been determined that the thermal conductivity of single multi-walled carbon nanotubes near 37,000 W/(m K) at a temperature of 100 K with the macroscopic thermal conductivity are able to achieve 6000 W/(m K) [8]. The thermal conductivity of single multi-walled carbon nanotubes at room temperature can be comparable to an isotopically pure diamond and can even achieve a greater value [9]. 3.2.1. SEM and EDX Characterizations SEM images of carbon nanotube and carbon nanotube–paraffin nanocomposites were used to describe their micromorphology using Scanning Electron Microscope manufactur- ing by JEOL Ltd., model: JSM-7100F, Tokyo, Japan. The multi-walled carbon nanotubes were made of a black powder with a laminar architecture and loosely packed particles, as shown in Figure 4, displaying PW-based MWCNTs nanocomposites. Figure 4 confirms that the MWCNT layers were distributed in the PW in various paths and spots. The MWCNTs created a framework that supports heat transfer. Moreover, the layers of the MWCNTs were totally and regularly covered by paraffin, where the MWCNTs and PW were strongly integrated as the content of the MWCNTs increased, without any microcracks or loose interfaces. These observations have been confirmed by the EDX Elemental Analysis (see Figure 5), of the spatial distribution of various emelments. 0 50 100 150 200 250 300 Time (min) Inlet Temperature Outlet Temperature Temperature (oC)PDF Image | Paraffin Wax As a Phase Changing Material PCM
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