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Please Check my calcs

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Posted by Eichler on July 01, 2006 at 18:11:23:

In Reply to: Re: Do I need a pump with integrated check valve posted by HeatPro on July 01, 2006 at 12:33:06:

The Knight 150 specs a 15' head loss at 15 gpm. ..10' loss at 10 gpm. The head loss on the Trinity tube is 2x higher.

2250 sq ft single story home with an estimated 2500 feet of 1/2 in copper pipe to cover 10 loops plus trunk routing, all driven from on circulator pump.

2250=6*250'+3*200'+1*150'

ESTIMATE PEAK for 1/2 in copper pipe:
6 loops of 250' --> 24' head loss for 3.2gpm living+living+dining+kitchen+study+mbed/bath
3 loops of 200' --> 18' head loss for 2.4gpm bed2+bed3+breakfast
1 loops of 150' --> 12' head loss for 1.2gpm bath2

total 27.6 gpm to maintain peak 40 btu/sq ft sized for cold home quick heat

assuming 20% head loss for each parallel connection friction when multiple loops are placed in parallel.

This comes to ~ 4' head loss at a peak flow of 27.6 gpm

15' head loss from Knight 150 + 4' head from 10 parallel circuits = 19' head loss

UP26-99BF pump graph shows about 15gpm at 19'head loss. About half the peak flow estimate for 40 TU/hour. Marginally acceptable...why I asked for help. Most loops are valve throttled to lower flow rates, so the 32' head seems necessary for a single pump dirving 10 paralle loops.

Is this a reasonable method and results?

Follow Ups:

Re: Please Check my calcs porn 18:58:30 10/09/2006 (0)
Re: Please Check my calcs HeatPro 21:59:31 7/01/2006 (5)
- Re: Please Check my calcs HeatPro 23:39:49 7/01/2006 (4)
  - Re: Please Check my calcs Albert 19:40:37 7/17/2007 (0)
  - Re: Please Check my calcs porn 19:01:36 10/09/2006 (0)
  - Re-Calc: cut flow rates by 50% for 1/2" pipe limits Eiclher 11:45:33 7/04/2006 (1)
    - Re: Re-Calc: cut flow rates by 50% for 1/2" pipe limits HeatPro 13:19:17 7/04/2006 (0)

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Comments:
: The Knight 150 specs a 15' head loss at 15 gpm. ..10' loss at 10 gpm. The head loss on the Trinity tube is 2x higher. : 2250 sq ft single story home with an estimated 2500 feet of 1/2 in copper pipe to cover 10 loops plus trunk routing, all driven from on circulator pump. : 2250=6*250'+3*200'+1*150' : ESTIMATE PEAK for 1/2 in copper pipe: : 6 loops of 250' --> 24' head loss for 3.2gpm living+living+dining+kitchen+study+mbed/bath : 3 loops of 200' --> 18' head loss for 2.4gpm bed2+bed3+breakfast : 1 loops of 150' --> 12' head loss for 1.2gpm bath2 : total 27.6 gpm to maintain peak 40 btu/sq ft sized for cold home quick heat : assuming 20% head loss for each parallel connection friction when multiple loops are placed in parallel. : This comes to ~ 4' head loss at a peak flow of 27.6 gpm : 15' head loss from Knight 150 + 4' head from 10 parallel circuits = 19' head loss : UP26-99BF pump graph shows about 15gpm at 19'head loss. About half the peak flow estimate for 40 TU/hour. Marginally acceptable...why I asked for help. Most loops are valve throttled to lower flow rates, so the 32' head seems necessary for a single pump dirving 10 paralle loops. : Is this a reasonable method and results?

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