Joined on January 19, 2012
Last Post on June 8, 2014
@ October 7, 2013 5:35 PM in refrigerent traps and subcoolingin function of a regular trap vs an inverted strap. Thanks Mike
@ October 6, 2013 1:00 PM in refrigerent traps and subcoolingwhat is the function of an inverted suction trap on a system where the condenser is above the evap. And in a refrigeration system with a txv/receiver where does one measure subcooling. Thanks, Michael.
@ October 6, 2013 12:43 PM in noisy belt driven Air Handlerits been a long time but thank you for the responses. I changed the pulley on the motor and they have not called back.
@ September 2, 2013 11:37 PM in noisy belt driven Air HandlerHello to all.
I recently changed a blower motor (1/3 hp) that uses a belt to drive the blower on an old 3 ton air handler that customer states had started to make squeeking type of noises before it died. I replaced the motor and belt and about three weeks later it was making a constant high pitch noise worse than before, not sure where its coming from. I adjusted the pully on the motor to be more in line with the pully of the blower and for the remainder of the time I was there it was fine but it started again soon after that. Now it starts with a constant cycle of humming and then squeeking and again humming then squeeking.
Other important things I noticed are
1)If I remember correctly when I removed the cover the noise stopped
2) The new belt after 3 weeks seemed to have been a lot looser then when first installed.
3)Noise only happens with belt in place
4) blower has pillow type bearings that seem to be properly greased.
Any help would be greatly appreciated, Michael
@ April 18, 2013 12:46 PM in Finished Attic Heat GainHello to all!
I need to figure out the heat gain for a room in a finished attic (R-11/dark roof). My understanding is that without a "proper" vented attic above, these rooms can get very hot. Manual J has "Roof-Ceiling Combination", but the HTM is less than "Ceiling under vented attic". Any help would be appreciated.
@ February 17, 2013 1:23 PM in how much BTU does a person give offDr. Silberstein. I am actually looking for an accurate number. I need to do a heat load calculation for a house of worship and need to be precise.
Thanks agian, Michael.
@ February 15, 2013 5:07 PM in how much BTU does a person give offHello to all
How much cooling BTU (both sensible and latent) do you need the heat given off by a person?
@ February 8, 2013 12:02 PM in hot water loop off steam boilerreading link that dan included with his response, that answered my question about why the water stays up. But i still dont know what a heel tee is and why that caused boiler flooding.
Thanks again, Michael
@ February 8, 2013 11:54 AM in hot water loop off steam boilerThanks for the response, much appreciated.
You got me thinking with the example you gave, what does keep the water in the loop from pushing back into the boiler? What is a heel tee and why did that allow the water to flood the boiler?When you say gauge, you mean a temperature gauge?
Thanks for your time and advice, Michael.
@ February 7, 2013 8:26 PM in hot water loop off steam boilerthanks again dan, much appreciated.
@ February 7, 2013 3:58 PM in heat load calculation-HELPthats what it might be but was not sure. thanks
@ February 7, 2013 2:23 PM in hot water loop off steam boilerto get a response directly from you dan. but whats "gravity circulation"? and whats blending. like i said i have read the book but am new to much of the concepts.
@ February 7, 2013 2:00 PM in hot water loop off steam boilerhello to all
i have been in the trade for almost a decade but have only recently become exposed to the beauty of 'the lost art of steam heat'. why does the hot water loop need flow controls on supply and return? even when producing steam wont they both be at the same pressure and therefore have no flow. also, on one such loop there was a 3/4 inch pipe connecting the two flow controls, whats that for?
thanks for the help, michael
@ February 7, 2013 1:39 PM in heat load calculation-HELPthank you john. what is "studding"?
@ February 7, 2013 9:16 AM in bubbles in sight glassThanks for the response Mr Silberstein.
When you say that "this increases the flow rate in the liquid line" do you mean that the "extra" liquid leaving the liquid line through the txv causes a slight pressure drop in the line and causes flashing? Would i theoretically see bubbles in the entire liquid line as well?
@ February 6, 2013 10:52 PM in heat load calculation-HELPThanks for the response, i see the logic in what you are saying. Michael.
@ February 6, 2013 8:01 PM in heat load calculation-HELPthanks for the response. much appreciated