| Main
PMRefrigeration Tool page
Psychrometric inputs and reports |
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| The first step is
to enter your data on this single simple screen. DB, plus
either WB or RH, plus CFM, for each state desired. Altitude
is entered on another screen, and is applied
in all calculations. |
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Then
select a calculation from the drop-down list |
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The State point report
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| Each state
point has its own report drop-down, so you have all three full reports
available concurrently. The psychrometric report looks like this,
for each state point : |
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The Mixing process
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mixing process creates a special report set, which shows not only the
full 'mixed' state with full report as above, but also a Process Report
showing the effect on the system, in terms of 'What impact does the
difference between states 1 and 2 have on the system loads ?'
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example, in a cooling system with 1100 CFM RA, plus 100 CFM OA intake (
as in the screen shot at the top of this page ), how much does that OA
increase the system load ? Run the 'Mix' process with one click
for this set of reports. |
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The Mixing Report
tells you the net effect on the system of the difference between the RA
in state 1, and the OA in state 2. In this example, an added 0.63
tons of cooling is needed for this 100 CFM of OA ( as opposed to 'if the
OA condition were the same as the RA condition' ). In other words,
the true system load of the OA. Of course, a full detail State
Point Report is also created at the same time for the Mixed point, State
3.
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Now calculate the same RA, but with 100 CFM of cold winter OA, to see
that you will have gained 0.8 tons of free cooling ( or, to look at the
flip side, that you need 2.8 KWH to maintain temperature with this 100
CFM ventilation, 3,668 BTUH of which needs to be humidification if you
want to maintain 50 % RH inside ).
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The Deltas report
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Given a typical A/C
system RA as at left, and a typical SA ( which will be at saturation ,
as it's right off the coil ), in addition to the state point reports for
each, the Deltas process report will be created for any points that have
equal CFM ( mass flow ).
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