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This program contains procedures for sizing and/or
calculating the performance of Maxim heat recovery
equipment. Models, sizes and maximum working pressure
correspond to those in the "Maxim Heat Recovery Catalog.
Note that the maximum operating pressure is less than the
maximum working pressure by the larger of 5 psi or 10 %. For
convenience the catalog Values are summarized below:
|
MODEL |
SIZE
RANGE |
MAX. PRESS. |
|
MFT |
4 - 14 |
150 |
|
TRP |
4 - 14 |
20 (OPTIONAL 165) |
|
BVS |
3 - 30 |
20 |
|
WVS |
3 - 30 |
50 |
|
GTS |
20 - 200 |
150 |
|
GTW |
20 - 200 |
150 |
|
MBT |
14 - 30 |
150 |
|
HSS |
10 - 500 |
150 |
|
BPV |
2 - 6 |
185 |
|
ESV |
2 - 6 |
185 |
|
MCR |
100 - 2500 |
ATM |
|
SOH |
SPECIAL |
SPC |
Conditions that result in non-standard sizes or
undesirable operation cause the program to halt until the
input data causing that condition is corrected.
Some other conditions do not cause a program halt, but
may require special construction features to accommodate
them. Examples of the latter include sewage gas fuel and
exhaust gas temperatures above 1200 F. Contact Maxim for
material recommendations. Atmospheric conditions affect the
amount of heat recovered. The conditions assumed in this
program are 80 F, 14.7 psia and 50 % relative humidity. If
conditions vary significantly from these values, it is
recommended that you have the performance verified by Maxim
before using in a critical application. The pressure drop
program is provided to determine the pressure drop of simple
piping systems such as those used in conjunction with
silencers and heat recovery units. It is limited in
capability and should only be used within the following
limits:
- Piping components are in series.
- Pipe and fittings are all the same size.
- Single phase flow.
- Pressure drop for air does not exceed 1/10 of
upstream pressure.
- Elevation change between inlet and outlet is
negligible.
- Temperature change between inlet and outlet is
negligible.
- Pressure should not exceed ratings for silencer or
heat recovery unit.
- Atmospheric pressure is near sea level (14.7 psia)
When a heat recovery unit is to operate at high altitudes
(over about 1800 ft.), a correction factor must be applied
to the calculated GAS side pressure drop to compensate for
the reduced density of the gas. One method of doing this is
to determine the pressure drop based on a flowrate in acfm
at standard atmospheric pressure and multiply the results by
the ratio of (14.7/Patm), where Patm is the absolute
atmospheric pressure at the operating altitude in psia. This
same correction factor applies to piping pressure drop
calculations that involve gases.
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