TSI Incorporated VelociCalc Plus 8384, Руководство по эксплуатации и обслуживанию

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14 Chapter 3
HEAT FLOW
Key (Model 8386/8386A Only)
In order for the V
ELOCI
C
ALC
Plus to calculate heat flow, the flow rate,
temperature, and humidity need to be recorded at one location before the
heating (or cooling) source and one location after the source. The data at
these locations must be stored in two sequential test IDs. The first test ID is
used as reference for calculating heat flow in the second test ID. To store the
required data for heat flow calculations, proceed as outlined below.
1. Make sure that the correct barometric pressure is entered in the
instrument or the obtained readings will be incorrect. If flow is being
measured from a Pitot tube, make sure the correct flow temperature is
also entered. The flow rate displayed must be is STANDARD flow, not
ACTUAL flow, or the “nO rEF” message will appear on the display.
This message indicates that there is missing or incorrect reference data
for calculating heat flow. (See
ACTUAL/STANDARD
Key section for
details on setting these parameters.)
2. Make sure the instrument is in discrete (or single point) sampling mode.
(See
SAMPLE INTERVAL
Key and
SAMPLE
(options) Key sections for
details on how to be in discrete sampling mode.)
3. Press
NEXT TEST
to start a new test ID.
4. Press
VELOCITY/FLOWRATE
key to display flowrate.
5. Press
SAMPLE
key and store multiple readings at the first (reference)
location. Taking several samples in the traverse of the duct provides
accurate average readings.
6. Press
TEMPERATURE
key.
7. Press
SAMPLE
to record the temperature readings.
8. Press
HUMIDITY
key to display relative humidity (% RH).
9. Press
SAMPLE
to record the relative humidity.
10. Press
NEXT TEST
key to advance to the next test ID. Move probe to the
second location. (Make sure that at least 3 inches (7.5 cm) of the probe
are in the flow to allow the temperature and humidity sensors to be in
the air stream.)
11. Press
HEAT FLOW
key to get instantaneous readings of sensible heat
flow. Press key three more times to display latent heat flow, total heat
flow, and sensible heat factor.
12. Press
SAMPLE
key to store readings at second location.