Retrotec USACE - Manual (Page 359)

Appendix G G29
G.14.5 Heating System Measurements
Water fl ow measurements and temperature measurements of heat ■
exchanger (two to three days, minimum, are needed)
Water fl ow can be measured by clamp-on meters (ultrasonic method;
■
also, pipe wall thickness must be measured)
Measurements of selected radiators (surface temperature distribution,
■
incoming and outgoing water fl ow measurements)
G.14.6 Other Measurements
Heat-fl ux measurements to determine the U-value of certain building ■
parts
Draft measurements using smoke and precision direction-free (3-D)
■
thermoanemometer
Globe-temperature measurements by globe thermometer
■
G.14.7 Questionnaire
A questionnaire to map user’s comments and opinions ■
Interviews of operating staff, janitors ■
G.14.8 Document Study
Consumption fi gures, benchmarking (comparison with similar build- ■
ings and the history of that particular building), and so on; comparison
to weather data is a source of more reliable information about building
conditions and material properties.