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Alco Controls

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92<br />

<strong>Alco</strong> <strong>Controls</strong><br />

Correction Tables for the Selection of Solenoid Valves<br />

For use with 110 RB, 200 RB, 240 RA and 540 RA Series<br />

Valve selection for operating conditions other than<br />

nominal:<br />

Q n = Q o x K t x K∆p<br />

Q n : Nominal valve capacity<br />

K t : Correction factor for evaporating and liquid<br />

temperature<br />

K∆p: Correction factor for pressure drop at valve<br />

Q o : Required cooling capacity<br />

1. Suction Gas Application<br />

Evaporating Correction Factor K t<br />

Temperature Condensing Temperature °C<br />

°C +60 +55 +50 +45 +40 +35 +30 +25 +20<br />

+10 1,03 0,97 0,92 0,88 0,84 0,80 0,76 0,74 0,71<br />

0 1,40 1,32 1,25 1,20 1,14 1,10 1,04 1,01 0,96<br />

-10 1,71 1,62 1,53 1,47 1,40 1,34 1,27 1,23 1,18<br />

-20 2,20 2,08 1,97 1,88 1,80 1,72 1,64 1,58 1,51<br />

-30 2,79 2,63 2,50 2,39 2,27 2,19 2,07 2,01 1,92<br />

-40 3,68 3,47 3,29 3,15 3,00 2,89 2,73 2,65 2,53<br />

2. Liquid Application<br />

Correction Factor K∆p<br />

∆p (bar) 0,05 0,10 0,15 0,20 0,25 0,30 0,35 0,40 0,45 0,50 0,55<br />

K∆p 1,73 1,22 1,00 0,87 0,77 0,71 0,65 0,61 0,48 0,55 0,52<br />

Liquid Correction Factor K t<br />

Temperature R 134a Evaporating Temperature °C R 22<br />

entering Valve<br />

°C +10 0 -10 -20 -30 +10 0 -10 -20 -30 -40<br />

+60 1,33 1,40 1,48 1,56 1,67 1,26 1,30 1,38 1,38 1,44 1,50<br />

+55 1,23 1,29 1,36 1,43 1,52 1,19 1,22 1,29 1,29 1,34 1,39<br />

+50 1,15 1,20 1,26 1,32 1,39 1,12 1,15 1,21 1,22 1,26 1,30<br />

+45 1,08 1,12 1,17 1,22 1,29 1,06 1,08 1,15 1,15 1,18 1,23<br />

+40 1,01 1,05 1,10 1,14 1,20 1,01 1,03 1,09 1,09 1,12 1,16<br />

+35 0,96 0,99 1,03 1,07 1,12 0,96 0,98 1,03 1,03 1,06 1,10<br />

+30 0,91 0,94 0,98 1,01 1,06 0,92 0,94 0,99 0,98 1,01 1,04<br />

+25 0,86 0,89 0,92 0,95 1,00 0,88 0,89 0,94 0,94 0,96 0,99<br />

+20 0,82 0,85 0,88 0,91 0,94 0,84 0,86 0,90 0,90 0,92 0,95<br />

+15 0,78 0,81 0,84 0,86 0,89 0,81 0,82 0,87 0,86 0,88 0,91<br />

+10 0,75 0,77 0,80 0,82 0,85 0,78 0,79 0,83 0,83 0,85 0,87<br />

+5 0,74 0,76 0,78 0,81 0,76 0,80 0,79 0,81 0,83<br />

0 0,71 0,73 0,75 0,78 0,73 0,77 0,77 0,78 0,80<br />

-5 0,70 0,72 0,74 0,74 0,74 0,75 0,77<br />

-10 0,68 0,69 0,71 0,72 0,71 0,73 0,74<br />

Correction Factor K∆p<br />

The pressure drop can be calculated with the<br />

following formula:<br />

∆p (bar) 0,05 0,10 0,15 0,20 0,25 0,30 0,35 0,40 0,45 0,50 0,55 0,60 0,65 0,70 0,75<br />

K∆p 1,73 1,22 1,00 0,87 0,77 0,71 0,65 0,61 0,58 0,55 0,52 0,50 0,48 0,46 0,45<br />

2 Q0 ∆ P = ∆P __<br />

0 n* 2 Qn ∆ P n = 0,15 bar<br />

∆ P n : Pressure drop under nominal conditions<br />

A2.5.1/1003/E

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