Issue:
BPHE Evaporator Pressure Drop Calculation
Resolution:
Chiller with a BPHE
- When measuring the evaporator pressure drop, the field technician will need to "normalize" the height of the gauge (measure entering and leaving at the same gauge height) or do some math to take into account the lift.
- For the DP400 series heat exchangers (40T-130T) the entering to leaving water connections are almost 24 inches height difference, so conservatively use 2.0 ft as the lift if doing the math and not normalizing the gauge height.
- For the DP200 series heat exchangers (20T-30T) it is about 18 inches height difference, so use 1.5 ft for doing the math.
The bottom line is if they place the entering and leaving pressure gauges at the same level, then the curves are correct.
- If you normalize by keeping the gauge at the same level for both readings, make sure the hose/connection is purged of air so the water gravity head is put into play
Facts:
- CGAM
- ACSA
Document Identifier: DOC-99655
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.