Results 1 to 5 of 5
Thread: Pressure drop
-
29-12-2009, 04:01 PM #1
Pressure drop
I have a walk-in freezer with duel evaporators. There is approximately 90 feet of suction line back to the condensing unit. The suction line has solenoid valves, filter and an accumulator. Taking pressure reading at the compressor how do I find the pressure drop for superheat calculations?
-
29-12-2009, 04:19 PM #2
Re: Pressure drop
There's really no magic way. Installing an access fitting at the evap outlet is the only accurate procedure.
Heatcraft's piping chart list the pressure drop for copper fittings and pipe.
Here's the link to this manual. http://www.hvacrinfo.com/loadcalcs.htm
Just curious, why is there a solenoid valve in the suction line?
To find the pressure drop for the solenoid you will need to get the part number and brand of the valve and look in the manufacturers catalog. Same rule applies for the accumulator. Unless the suction filter has an outlet access fitting, it's a guess.Last edited by powell; 29-12-2009 at 09:23 PM.
Thousands of HVACR manufacturers links! Visit: www.hvacrinfo.com
-
29-12-2009, 05:34 PM #3
Re: Pressure drop
Im sorry, there is no solenoid in the suction line. I planned on putting access fittings in next time it goes down. That is a great link thank you.
-
29-12-2009, 08:01 PM #4
Re: Pressure drop
If you have an externally equalized TXV/TEV you may be able to put an access point at the valve balance line connector.
Brian - Newton Abbot, Devon, UK
Retired March 2015
-
30-12-2009, 05:07 AM #5
Re: Pressure drop
Pump down system and install a schrader access port at the point in system that the TX valve buld is fitted. Gauge at that point versus a gauge at compressor will tell all.
Every bend ,fitting and pipe size and length of pipe will add superheat to compressor performance, and de-grade system performance accordingly. Try and keep max loses or super heating loses to max +5.0 ' C. Vertical head losses can be a killer with liquid lines loses producing flash gas liquid feeding TXV. System performance reduced.
magoo
Similar Threads
-
About liuid line pressure drop.
By wilsoncheung in forum Technical SpeculationsReplies: 15Last Post: 16-03-2009, 11:34 AM -
Capillary Tube Characteristics
By Chef in forum FundamentalsReplies: 9Last Post: 10-03-2009, 01:03 PM -
Benji
By benji in forum Trouble ShootingReplies: 29Last Post: 30-01-2008, 01:25 PM -
TEV capacity related to pressure drop
By DaBit in forum CPU OverclockersReplies: 8Last Post: 06-12-2002, 05:11 PM