Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.
Primary/secondary and GPM on a circuit
TomTA
Member Posts: 20
in Oil Heating
I was reading “Pumping away” (very interesting book) but one of the many things that still confuses me is the GPM flow over a circuit. The example in the book that prompted this question had a primary/secondary setup. The primary flows 14 gpm, and there are 3 secondary circuits which demand 3, 3, and 8 gpm each, for a total of 14. The GPM flow of each secondary circuit is calculated based on the emitter size and temperature drop (I assume). What I don’t understand is how do you LIMIT that circuit to 3 gpm (or do you?). Do you add enough restrictions to the circuit so that the pump curve puts flow at 3 gpm? I can’t imagine intentionally setting up an energy waste like that. Or is the 3 GPM the “effective flow” in terms of heat loss; that instead of flowing 3 GPM with a 20 degree heat drop, it might be flowing 6 gpm with a 10 degree heat drop. You just let the pump push through whatever it wants/can, and the emitter size will strip off the appropriate level of BTUs?
0
Comments
Categories
- All Categories
- 86K THE MAIN WALL
- 3.1K A-C, Heat Pumps & Refrigeration
- 52 Biomass
- 421 Carbon Monoxide Awareness
- 81 Chimneys & Flues
- 1.9K Domestic Hot Water
- 5.3K Gas Heating
- 96 Geothermal
- 154 Indoor-Air Quality
- 3.3K Oil Heating
- 60 Pipe Deterioration
- 893 Plumbing
- 5.9K Radiant Heating
- 379 Solar
- 14.7K Strictly Steam
- 3.2K Thermostats and Controls
- 52 Water Quality
- 41 Industry Classes
- 47 Job Opportunities
- 17 Recall Announcements