ZEMCH 2019 International Conference Proceedings April.2020 | Page 433
Figure 2. Example of the flow pattern of thermal collector
Simpler patterns are advantageous for manufacturing but may be less favorable for flow
distribution uniformity. The more complex the pattern, the more favorable the flow distribution, but
the higher the defective rate or the more complicated the manufacturing.
The design guide for collector design in this study is as follows.
‐ Consists of primary manifold and secondary manifold.
‐ The primary manifold should be large enough to provide a good flow rate to the flow path.
‐ Design the flow rate in the primary manifold at 1 ~ 2 liter per minute (LPM).
‐ The flow path of the secondary manifold is minimized in cross section so that high pressure is
applied and the entire flow rate of the collector can flow evenly.
‐ Vent configuration is needed for air bubbles in the flow path.
‐ The sheet design guide for high frequency fusion is as shown in Table 1 below.
Table 1. The sheet design guide for high frequency fusion.
Item
Outer Adhesive Space
Adhesive thickness
Section height and shape
PVC sheet thickness
Value
10mm
5mm
‐
0.3 ~ 0.5mm
Remark
Depends on expansion
The feasibility test items are as follows.
‐ Pressure test: Durable test (30 minutes ) by pneumatic injection at 1.2kgf
‐ Experiment to check uniformity of flow speed
‐ Differential pressure change experiment with flow rate
We used the E8 model (FLIR) for infrared thermal imaging equipment, the pressure was measured
by a differential pressure gauge.
3. Results
Experiments were tested to confirm the difference between the PVC single layer and the multi‐
layer and the difference between the patterns.
3.1. Pressure Test: Durable test
Two layers (PVC sheet + Fabric) and one sheet of PVC sheet were tested.
A study on the Feasibility of Applying PVC Flexible Sheet for PVT collector
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