Using the TPS-EFF Meter and optional Compression Stand (TPS-EFF-CS) , Thermal Effusivity measurements were made on a polyester cotton water repellent fabric and memory foam. Test time (touch times) of 2 and 10 seconds were made.
Figure 1: Thermal Effusivity of Polyester Cotton Fabric
| SAMPLE 1: Polyester Cotton Fabric | |
|---|---|
| Compression Force: | 1 lb |
| Test time (2 seconds): | 260 W√s/m2K |
| Test time (10 seconds): | 254 W√s/m2K (layered for sufficient thickness) |
Figure 2: Thermal Effusivity of Memory Foam
| SAMPLE 2: Memory Foam | |
|---|---|
| Compression Force: | 1 lb |
| Test time (2 seconds): | 73 W√s/m2K |
| Test time (10 seconds): | 71 W√s/m2K |
Figure 3. Thermal Effusivity of Polyester Cotton Fabric with memory foam
| SAMPLE 1 & 2: Polyester Cotton Fabric was placed over the Memory Foam | |
|---|---|
| Compression Force: | 1 lb |
| Test time (2 seconds): |
203 W√s/m2K |
| Test time (10 seconds): |
165 W√s/m2K |
When testing single type materials, test times (touch times) of 2 and 10 seconds measure (feel) very similar as the heat stays within that sample. When a more effusive layer is placed over a more insulative layer and measured, the feeling decays with test time (touch time) as heat from the sensor (your skin) is dominated by the lower effusivity layer.
Figure 4. Test times to simulate touch time