Methods 8 & 9: Temperature Methods
Method 8: Temperature Rise
| Temperature Rise |
Rating | Comments |
|---|---|---|
| Overall Value |  |
Useful as a check of BTU. Not accurate for flow measurement due to variation based on placement of temp probes and several assumptions needed to convert temp rise to CFM. |
| Recognized by Standard 310 | No | Not recognized by ANSI/ACCA/RESNET. |
| Residential Accuracy |
 |
Can be very inaccurate due to placement of probes, assumptions in calculations. |
| Consistency | |
Hard to get consistent results in residential across systems and different techs. |
| Equipment Cost |
$ | Price varies — but a basic measurement can be done very cost effectively. |
| Time (Min) | 5 to 20 | Measurements are quick but must take time to ensure system has run and that probe placement yields accurate temps. |
Method 9: Temperature Split
| Temperature Split |
Rating | Comments |
|---|---|---|
| Overall Value | |
Useful as a check of BTU. Not accurate for flow measurement due to variation based on placement of temp probes and several assumptions needed to convert temp rise to CFM. |
| Recognized by Standard 310 | No | Not recognized by ANSI/ACCA/RESNET. |
| Residential Accuracy |
|
Can be very inaccurate due to placement of probes, assumptions in calculations. |
| Consistency | |
Hard to get consistent results in residential across systems and different techs. |
| Equipment Cost |
$ | Price varies — but a basic measurement can be done very cost effectively. |
| Time (Min) | 5 to 20 | Measurements are quick but must take time to ensure system has run and that probe placement yields accurate temps. |
