TABLE OF CONTENTS Addition of carpet to a floor construction is a straightforward exercise that provides some insight into the dynamics of the sensible cooling load calculation. Since carpets are of lightweight construction, they can be approximated as a purely resistive layer without significantly affecting the simulation. Table 3.14 and 3.15 show typical R-values for carpet and carpet padding. While carpets can have a wide range of R-values, their longwave radiative properties are very similar all have emissivities between 0.90 and 1.0.
| Sample | Fiber Type | Yarn Type | Style | Pile Height, in. | Pile Weight, oz/yd 2 | Gauge | Stitches per in. | Tufts/ in. 2 | R-value |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Nylon | CF | LL | 0.125 | 10 | 1/10 | 8 | 80 | 0.68 |
| 2 | Nylon | CF | LL | 0.109 | 20 | 1/8 | 6 | 48 | 0.65 |
| 3 | Nylon | CF | LL | 0.192 | 28 | 1/8 | 8.4 | 67.2 | 0.67 |
| 4 | Nylon | CF | LL | 0.125 | 24 | 1/10 | 8.6 | 86 | 0.55 |
| 5 | Nylon | S | Plush | 0.25 | 24 | 1/8 | 11 | 88 | .1.12 |
| 6 | Nylon | CF | HLL |
| 24 | 5/32 | 8.6 | 55 | 1.33 |
| 7 | Nylon | CF | Shag | 1.07 | 24 | 3/16 | 5.2 | 27.7 | 1.51 |
| 8 | Acrylic | S | LL | 0.21 | 42 | 1/10 | 8 | 80 | 0.78 |
| 9 | Acrylic | S | LL(FB) | 0.21 | 42 | 1/10 | 8 | 80 | 1.03 |
| 10 | Polyester | S | Plush | 0.28 | 42 | 5/32 | 8.5 | 54.4 | 0.95 |
| 11 | Polyester | S | HLL |
| 42 | 5/32 | 8.5 | 54.4 | 1.66 |
| 12 | Nylon | S | Saxony | 0.552 | 40 | 3/16 | 5.5 | 29.3 | 1.96 |
| 13 | Nylon | CF | Shag | 1.25 | 43 | 3/16 | 4.2 | 22.4 | 2.46 |
| 14 | Wool | S | Plush | 0.487 | 43 | 5/32 | 7 | 44.8 | 2.19 |
