R134a System Circulators: Finding the Right Pump

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Discussion Overview

The discussion revolves around selecting an appropriate pump for a system using R134a as the working fluid. Participants explore the requirements for circulators, including considerations of pressure drop, head, and the nature of the fluid (liquid or vapor). The focus is on practical applications and specifications needed for effective pumping.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant inquires about the specific circulators needed for R134a and whether a standard domestic heating pump could suffice, given that R134a is a non-corrosive fluid.
  • Another participant asks for details on gallons per minute (GPM) requirements, pressure needs, and temperature range, noting the implications of R134a being a refrigerant and the potential for vapor pumping.
  • A later reply reiterates the GPM requirement of 2, temperature of 285 Kelvin, and confirms the presence of vapor, while questioning the need for a constant-volume positive-displacement pump and the importance of pressure differential and seal quality.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the type of pump suitable for the system. Multiple viewpoints regarding pump specifications and requirements remain present.

Contextual Notes

Details regarding the specific pressure differential across the pump and the maximum pressure required for seal integrity are not fully resolved, which may affect the choice of pump.

amish99
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Just a quick question, which mayb be very simple to answer,

I have a system which is currently running R134a as the working fluid, are there specfic circulators i have to use to move the fluid around?

I have the pressure drop and head for the system calcuated, but am stumped on what pump i am able to use.

Being a non corrosive fluid, can i get away with a normal domestic heating pump?

Cheers
 
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What are your GPM (gallons per minute) requirements? What pressure (in,out) do you need? What temperature range? Because R134A is a refrigerant, will you be pumping vapor at all?
 
The gallons per minute required is 2
the temp is 285 kelvin and yes there will b vapour
 
amish99 said:
The gallons per minute required is 2
the temp is 285 kelvin and yes there will b vapour
Do you need a constant-volume positive-displacement (liquid or vapor) pump? What is the pressure differential across the pump? The maximum pressure determines how good the seals need to be, and the pressure difference determines the horsepower.
 

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