Bench Scale Study of the Vacuum Freezing Ejector Absorption Process Page: 57
vii, 257 p. : ill.View a full description of this report.
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temperature of the brine in the evaporator was
manipulated by injecting either the cold brine
(to lower the evaporator pressure) or the hot
brine (to increase the evaporator pressure).
The cold brine flow was automatically controlled
by a temperature regulator, see fig. 4.
The ejector bench scale test loop operated extremely
well. All the controls functioned properly.
Thermally, the loop was very stable. Once the test
conditions were set, the loop operated the whole day
without manipulations. This was a great asset for
data collection, which often took 30 to 60 minutes.
Instrumentation
The test loop was amply instrumented for the measure-
ments of pressure, temperature, flow rates, velocity
profiles and pressure profiles. See fig. 5 .
1. Flow rate measurements: The flow rates of brine
in various loops were calibrated for a sp. gr.
of 1.115 (15% NaCl solution at 320F). No density
correction was needed as the brine concentration
was kept very close to 15.0% (+ .05%) and tempera-
ture was in the range of 24-32"F. This results
in a density change of less than 0.5%. Thus, the
brine flow rates were read off directly.
Steam flowing out of the desuperheater was
measured by an orifice-meter. Temperature and
pressure at the inlet of the orifice were
measured and used to compute the density. The
pressure drop across the orifice was measured
in inches of water by a differential pressure
gage and from this data the flow rate of steam
was computed.
The flow rate of the vapor at the inlet of the
diffuser was measured by a pitot tube tranverse.
The static pressure read off a tap on the duct
diameter and total pressure traverse was made
across the horizontal and vertical diameter of
the duct (Dia. = 7.75"). A 16 point traverse
was used, with pitot tube being placed 1.37,
2.37, 3.06 and 3.62 inches away from the center.
2. Temperature measurements: All temperatures
were sensed by copper-construction thermocouples
and recorded on a 24 point recorder.
3. Pressure Measurements: Pressure above atmospheric
occurred in the steam lines and brine lines and
these were measured by Bourdon pressure gages.-57-
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Koretchko, J. & Hajela, G. Bench Scale Study of the Vacuum Freezing Ejector Absorption Process, report, November 1971; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc11786/m1/66/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.