HVAC primary & secondary pumping system

[firefastball]

Hi there,

Can anyone please guide on the advantage of having a constant primary and variable secondary pumping system compared to a variable primary only system?

Also what happen if I close the valve on the decoupler for a primary-secondary pumping system? Would there be any risks on the pumps?

Thanks

 

[LittleInch]

Try reading and understadnig something like this

http://www.industrialcontrolsonline.com/training/online/learn-about-primarysecondary-pump-systems

A constant primary with multiple secondary pumps allows the primary system to maintain a steadier temperature and reduces secondary pipe size as the secondary system only takes what it needs, not all of the flow.

Try drawing out what you mean for your system and look at the flows with and without the de-coupler. Probably not a good idea to close it.

Also please don't post in more than one forum (double posting) - it's not permitted on this site.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[willard3]

Read here:

http://classes.engineering.wustl.edu/2009/spring/jme4900/TEH-775 Primary Secondary Pumping.pdf