Joined on January 27, 2011
Last Post on December 1, 2013
@ March 6, 2013 10:07 PM in Looking for feedbackHigh efficiency for the public schools and in public works in general: never gonna happen. Public works based on principle: lowest bidder gets the job. Second principle : engineer design the job, contractor builds it. So the lowest bidder engineer designs the job he has no idea about, then lowest bidder contractors builds it. The result is only one possible: disaster.
On the private market some people buying high efficiency systems not for savings but just because they want the best in the house, but most do not care. I see high efficiency in USA as a market almost non existent. There is no market yet. Just me 2 cents
@ March 4, 2013 11:03 PM in steam radiators on hw systemOddly enough I faced same issue today. I'm thinking to vacuum system and then fill it. Just an idea. Then it might keep itself primed with micro bubble air eliminator.
@ February 23, 2013 8:16 AM in Baxi Luna HT pressure problemon the right hand side looking from the bottom you will see round blue color valve handle. make sure it is closed tight and not leaking. for some reason baxi luna ht 380 has a manual feed build in and there is no backflow device or auto feeder build in. it is just a valve. We usually install auto feeder air eliminator and additional expansion tank separately and keep baxi feed valve closed tight.
@ February 17, 2013 8:27 PM in garden hose for gas line"how can one believe someone who cant write any language or speak English very well passed licensing exams."
Are you making statement that I should not be permitted install boilers? English is not my native language. I speak with strong accent. But I m the one who makes all these boiler work after people with perfect English screw up installations. Perfect English makes perfect boilers? Boiler in the picture made in Germany by non English speaking people and installed in New York by people with less then perfect English.
@ January 13, 2013 11:07 AM in High delta T, how to adjust it?You post is unclear to me.
Pressure is a pressure. You can express it in head (feet or inches etc) or force per unit of surface.
Pressure difference at the beginning and end of the pipe is what moving water trough the pipe.
Pressure loss (or head loss etc)in a piping system is a loss of pressure of the water moving trough the pipe.
Pressure loss is a function of square of water velocity, length of the pipe and diameter of the pipe.
In a closed heating system pressure difference is created by circulator. Each circulator has a pressure/flow curve, describing its pumping (circulating) capacity. Each piping system has its own pressure/flow curve as well, The point where these 2 curves intersect is the point where pressure(head) and flow of the pump is same as pressure drop and flow of the system. Circulator adequate for system must have head/flow curve intersect with system curve in a point, providing sufficient flow to deliver heat to the radiator.
If circulator head/flow chart intersects with system pressure loss/flow with flow less then needed, then high delta T will be present.
Regarding Gravity self circulating system , moving force of the water is prssire differencial due to density difference of hot and cold water in supply and return.
Correct me if I'm wrong.
I'm eager to learn
@ January 12, 2013 2:04 PM in High delta T, how to adjust it?Thanks for information. We all learn from the best. I still have to learn what is static pressure and its difference from weight. Also I will write down thingis about hot and cold water. Thanks. BTW total pressure is the sum of static pressure and dynamic pressure. I remember it from hydrolic course in university I graduated 30 years ago.
@ January 12, 2013 9:30 AM in High delta T, how to adjust it?Hydrolic resistance of the system, AKA friction loss, dictates how many GPM is circulated trough closed loop. dependency of flow from system resistance is reflected in pump curve. higher resistance leads to lower GPM. picking up pump is a process of comparing system characteristics to pump characteristics. that's all. there is a limit to how many GPM each particular pump can push trough particular system system.
@ January 12, 2013 9:08 AM in High delta T, how to adjust it?you are right, amps in this case will not be max, only to support weight of water column.
@ January 12, 2013 8:45 AM in High delta T, how to adjust it?let's say i try to use this 007 taco for pumping water into tank located 125' up on the roof. this pump will lift water to max head, and then all energy consumed by pump will go into heating water around the pump, but no water will be moved. amps will be to the max, but the water will not be moved.
@ January 12, 2013 8:37 AM in High delta T, how to adjust it?if it is 1 story house according your assumed measurements head will be (10+28+48)x2X0.06=10.32'
there is no 007 taco that will go over 10' of head.
@ January 11, 2013 11:50 PM in High delta T, how to adjust it?SWAGuess.
First your comment made me upset, But then, I think to myself, when i start a new project and I do complete project modeling on my computer, and then i build it, and it works exactly as i designed it , I feel happy. Today i spent hours figuring out why Paxton controller did not work as i designed with 2 Grundfos VFD Magna and one Belimo 0-10 vdc actuator, and i found out , that control wire, running next to 24v power feed gave me 0.85vdc offset, and i corrected this problem and everything fell into the picture and i had perfectly functioning system. It made me happy. So your comment did not upset me.
@ January 11, 2013 6:47 AM in High delta T, how to adjust it?just assumed lenght of baseboard as a part of supply, then same goes for return pipe and some for risers. of cause it is very approximate, but better then nothing. 008 taco will work too. Also for head assumption dimeznsions of the house can be used as (W+L+H)X2 .
@ January 10, 2013 10:55 PM in High delta T, how to adjust it?you need 0012 taco circulator. 58'+42'=100' at 500btu per foot you get 50,000 btu output total. at 20F delra T your GPM is 50000/10000=5GPM your head around 58*3*0.06=10.5'
looking at taco chart you see 0012
you have to install circuit setters thou to set flows
@ January 8, 2013 10:49 PM in HOW TO GET A WEIL-MCLAIN GAS STEAMER BOILER TO TURN ON AND STAY ONlow water cut off tripping because automatic reset low water cut off defective. check another low water cutoff. Manual reset low water cut off just doing its job.
@ January 3, 2013 6:06 PM in feeling overwhelmedwill it be your statement that every one of them drives Kia Forte only and shops only at Wallmart? Nobody smokes tabacco? smoking today is 10 buck a pop per day, $280 per month, $3400 a year. they dont drink beer? they have money to spend to shorten their lives, but no money to pay for good heating system? If they give up their bad habits, they will have money for good heating system. It is just a matter of priorities.
@ January 3, 2013 6:27 AM in feeling overwhelmedWhen you writing about people not having money to spend on good heating system, you making mistake. It is not about money. Do not listen to what they are saying, What do you expect to hear? Hey i have money, could you take it? It is about priorities in life. It is about values. if people put their values in their comfort and their house, they will buy good and best system for themselves. Read Ellen Rohr book "Where did the money go?" It is a must read for everybody in this business.
@ January 1, 2013 9:23 PM in feeling overwhelmedI found my niche in 90+ boilers, i love VFD pumps technology, I love to bring steam systems in order. I love to do design of the heating systems, and BTW, system layout and specification depends on building demands, and i pick and choose elements of the system based on those needs and demands. I would recommend you go to training classes and trade shows regularly , when you will know and understand new stuff, you will be able to compete not on the price, but knowledge..
@ December 30, 2012 8:32 PM in Boiler sizeNo you do not have to add them. what you do is add 1/4 edr of removed radiators, just to account for existing piping to non existing radiators.