Zone Valve vs Zoned Circulator Comparison Check List

RB_2

Seems to be a reoccurring topic so here is a checklist for making comparisons...

I think it’s also necessary that when making comparisons it’s important to look at applications, arrangement of equipment, comfort expectations, types of loads and all available products.

hr

Operating cost

will vary somewhat with zoned pumps. Depends on how much energy you are moving while consuming X amount of electrical energy.

Siggy use a wire to water formula

E= .00302 X density of fluid X flow gpm x operating head

divided by wattage draw of circ.

So an 80 watt pump moving 10 gpm at 6 feet of heat would be 13.7% efficient.

E= .00302 X 60.7 X 10 X 6 divided by 80 watts

Use this same pump to move a mere 2 gpm @2 ft in a typical small radiant zone and look at the efficiency!

This is my biggest gripe about zoning with circ pumps. And without balance valves the circs could be running way off of the curve.

You would need to know these numbers for every pumped flow to be accurate in the comparison chart, wouldn't you?

hot rod

To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

RB_2

A Thanks Giving Treat

Hi Hot Rod,

I have just sent you a Thanks Giving Treat on the subject...and yes your comments are all valid...

Gobble Gobble

rb

hr

Now that's a serious treat

nothing like a full on ASHRAE response. Thanks

Now I'm really fowled up!

hot rod

To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"