Great Presentation, however when the filter is clogged the fan doesn't actually work harder. The full load amps for the fan motor will be less with a clogged filter than a new one because the fan is not able to move as much air. Example when you are using a shop vac and you put your hand over the nozzle the motor will speed up because the impeller is not under as much load.
Yes very true! The point I was trying to get across was that we will have to spin faster and faster to do the work of moving the same CFM through the duct system. Great analogy with the vaccum!
My heat pumps Fujitsu 2 ton (ARU24RGLX) , came with a default setting of Standard static pressure: 0.18 in.WG (45 Pa). I asked the installer to show me the equations they used to match up with the proper setting for static pressure. Of course I didn't receive any such information but did get the line: The system was designed for that heat pump so its all good. In the design/tech manual the function code for static pressure is 26 and the default setting is 31 which equates to .18 in. The settings start at 03 = .12 in (30 Pa), in increments of one up to a setting of 20 = 0.8 in (200 Pa). Then one has 31 = .18in and 32 = automatic air flow adjustment. I find it hard to believe that any work was done to optimize static pressure setting but want to know if leaving it at the default is best practice for installations? Would it be feasible to set it to 32 Auto adjusting??
Sir, I have one query, When designing the HVAC supply duct system, After calculation of ASP from the manufacturer blower data (ESP- Device pressure losses). That ASP will become the pressure drop budget for the duct system. Now if we are designing the duct system with equal friction method based on FR calculated...and carrying out CFD analysis of designed duct, the solver fetches static pressure and total pressure data w.r.t our design. Now w.r.t previously calculated ASP which is our pressure drop budget, say some 0.4 inches of water gauge. Now inorder to check whether duct design is within the limits as per ASP in CFD analysis tools. which pressure drop should I need to consider ( it's a total pressure in the volume of air or it's difference in Total pressure at inlet to outlets, or it's a max static pressure developed in the air volume inside duct) kindly clarify
Computer fans brought me here. I have a push pull configuration with shrouds on my water cooled radiator. It basically creates a large duct with a radiator in the center. I use static pressure fans at the front to pull air through a constricted silent case panel, mesh, and filter and then push it through a radiator, with more shrouds and fans pulling on the other side. I've been experimenting on the type of fan that goes on the pull side (that opens up into the internal chassis of the case). I kept trying more static pressure fans but lately I've been using "air mover" fans which are normally tuned for low restriction and really bog down at the slightest restriction (at least the high-end silent models do). However, on the other end of the radiator is wide open, so why not give it a shot? I've found my CPU temps dropping significantly. So I wonder... Should my air mover fans be able to pull/blow more air than the static pressure fans are blowing through or will this strain the static pressure fans by creating too little resistance and possibly even pulling them along or interfering with their flow? If I put air mover fans that don't move as much air, will that add resistance to the air the static pressure fans are moving, in turn, harming the static pressure motors? I also have to consider the vacuum created in the chassis by the exhaust fans and how the push/pull config seeks to fill that area. Should my exhaust fans outpace my radiator rig in order to create an empty space to fill with more "fresh," air? I'll watch the video and see what I can learn.
OK, right away... I wonder how I could measure the static pressure in my case? I wonder if I could get even more precise and measure the static pressure of my radiator that I'm pushing or pulling air through? Airflow and static pressure specs are definitely provided on all my fan boxes.
Pl advise best software or manuals Round / circular process duct calculation including, Expansion joint, Stiffner, development, pressure drop, Load calculation on each support
Excellent summary. I started researching Archimedes and his work on statics and hydrostatics and it led me here! Your analogy to blood pressure helped me conceptualize the topic much better. Ended up understanding my house heating and air conditioning much better, too. Thanks!!
Keep your filters clean and change regularly and don't black off to many vents. You can measure static pressure with a manometer. Sometimes you need to adjust blower speed because they weren't installed right. Poorly sized duct work, many factors.
Great explanation, what would cause a brand new trane air handler in an attic to drip water constantly on the ac filter? My HVAC guy said that is normal?
Condensation is normal. However it should be falling into a condensate tray then flowing out through a condensate drain. If the suction line is condensating then it may not be properly insulated.
Thanks for the video it was very educational and helpful. I have a Carrier 58mca-060-16110 furnace with air conditioning installed in a small room at the center of the house with grates in all the walls to the surrounding rooms(house is on a slab and doesn't have return ducting). The filter is mounted on the side of the furnace(one side exposed to the room) and sucks the air directly from the room.I have a digital manometer and want to check pressures on the furnace. I have a few questions if you don't mind. 1. Does the one probe need to be held in front of the filter or just anywhere near the furnace. Or is it needed at all, at least for the filter drop. 2. Does the probe inserted above the heat exchanger and below the evaporator coil need to be anywhere specific in the space. My coil is offset to the left side directly over the heat exchanger (no room to insert it) but there is a lot of open space to the right of it that's probably not directly in the airflow. Thanks
Yes High static shutoff, in the controls world we say cut out. I was having one of thise days were my memory totally failed me. But i finally remembered it installs closest to fan(blower) for best results.
makes a video about static pressure, but doesn't talk about static pressure.
The contrast between an air system and the blood system
Made me understand it much better
the blood pressure analogy just cleared everything up for me! how i thought it was and now its confirmed. this is how i learn best. relations. thx
Great Presentation, however when the filter is clogged the fan doesn't actually work harder. The full load amps for the fan motor will be less with a clogged filter than a new one because the fan is not able to move as much air. Example when you are using a shop vac and you put your hand over the nozzle the motor will speed up because the impeller is not under as much load.
Yes very true! The point I was trying to get across was that we will have to spin faster and faster to do the work of moving the same CFM through the duct system. Great analogy with the vaccum!
PSC and veritable speed motors work differently. VSM will over amp with high statc
You’ve a good ability to explain things coherently 👍🏼
My heat pumps Fujitsu 2 ton (ARU24RGLX) , came with a default setting of Standard static pressure: 0.18 in.WG (45 Pa). I asked the installer to show me the equations they used to match up with the proper setting for static pressure. Of course I didn't receive any such information but did get the line: The system was designed for that heat pump so its all good. In the design/tech manual the function code for static pressure is 26 and the default setting is 31 which equates to .18 in. The settings start at 03 = .12 in (30 Pa), in increments of one up to a setting of 20 = 0.8 in (200 Pa). Then one has 31 = .18in and 32 = automatic air flow adjustment. I find it hard to believe that any work was done to optimize static pressure setting but want to know if leaving it at the default is best practice for installations? Would it be feasible to set it to 32 Auto adjusting??
You're a psychopath that thinks you can live off equations. Think again, if you haven't already been cooked
Sir,
I have one query, When designing the HVAC supply duct system, After calculation of ASP from the manufacturer blower data (ESP- Device pressure losses). That ASP will become the pressure drop budget for the duct system.
Now if we are designing the duct system with equal friction method based on FR calculated...and carrying out CFD analysis of designed duct, the solver fetches static pressure and total pressure data w.r.t our design.
Now w.r.t previously calculated ASP which is our pressure drop budget, say some 0.4 inches of water gauge.
Now inorder to check whether duct design is within the limits as per ASP in CFD analysis tools.
which pressure drop should I need to consider ( it's a total pressure in the volume of air or it's difference in Total pressure at inlet to outlets, or it's a max static pressure developed in the air volume inside duct)
kindly clarify
Computer fans brought me here. I have a push pull configuration with shrouds on my water cooled radiator. It basically creates a large duct with a radiator in the center. I use static pressure fans at the front to pull air through a constricted silent case panel, mesh, and filter and then push it through a radiator, with more shrouds and fans pulling on the other side. I've been experimenting on the type of fan that goes on the pull side (that opens up into the internal chassis of the case). I kept trying more static pressure fans but lately I've been using "air mover" fans which are normally tuned for low restriction and really bog down at the slightest restriction (at least the high-end silent models do). However, on the other end of the radiator is wide open, so why not give it a shot? I've found my CPU temps dropping significantly. So I wonder... Should my air mover fans be able to pull/blow more air than the static pressure fans are blowing through or will this strain the static pressure fans by creating too little resistance and possibly even pulling them along or interfering with their flow? If I put air mover fans that don't move as much air, will that add resistance to the air the static pressure fans are moving, in turn, harming the static pressure motors? I also have to consider the vacuum created in the chassis by the exhaust fans and how the push/pull config seeks to fill that area. Should my exhaust fans outpace my radiator rig in order to create an empty space to fill with more "fresh," air? I'll watch the video and see what I can learn.
OK, right away... I wonder how I could measure the static pressure in my case? I wonder if I could get even more precise and measure the static pressure of my radiator that I'm pushing or pulling air through? Airflow and static pressure specs are definitely provided on all my fan boxes.
@@tronus98 Get a life. You are thinking too much to cool down a pc. I have been in that road and it is a waste of time.
@@Faruk651 LOL. I've had my fun with cooling and I won't let your shitty little post keep me from nerding out.
Pl advise best software or manuals
Round / circular process duct calculation including, Expansion joint, Stiffner, development, pressure drop, Load calculation on each support
Excellent summary. I started researching Archimedes and his work on statics and hydrostatics and it led me here! Your analogy to blood pressure helped me conceptualize the topic much better. Ended up understanding my house heating and air conditioning much better, too. Thanks!!
You're a very intelligent being
Romans 8:31
if God is for us who can be against us?
ah so open my vents, my wife always argues with me about that!
Amazing simple tutorial! Thanks!
What is the range of a good static pressure for an AC? Is 0.35 a good static pressure?
How does one test their static pressure to make sure its acceptable?
Static pressure is from to many 90s
Thank you! I
am a controls electrician. The best way for me to learn is to cement the information on UA-cam
Great Video!!! Could you go over some things that could help high static pressure?
Keep your filters clean and change regularly and don't black off to many vents. You can measure static pressure with a manometer. Sometimes you need to adjust blower speed because they weren't installed right. Poorly sized duct work, many factors.
Excellent Brada Thank You!
Whats in the air ducts ? 🧵# fibers
Thank you so much, please make more videos. You explain stuff very easy for us to understand
Plz make more videos.
I can't here it
Great explanation, what would cause a brand new trane air handler in an attic to drip water constantly on the ac filter? My HVAC guy said that is normal?
Condensation is normal. However it should be falling into a condensate tray then flowing out through a condensate drain. If the suction line is condensating then it may not be properly insulated.
@@bertellijustin6376 I kept on them and they finally replaced the coil and I have no issues now, but before it was constant water on the filters!
Excellent explanation, thank you!
Thanks for the video it was very educational and helpful. I have a Carrier 58mca-060-16110 furnace with air conditioning installed in a small room at the center of the house with grates in all the walls to the surrounding rooms(house is on a slab and doesn't have return ducting). The filter is mounted on the side of the furnace(one side exposed to the room) and sucks the air directly from the room.I have a digital manometer and want to check pressures on the furnace. I have a few questions if you don't mind.
1. Does the one probe need to be held in front of the filter or just anywhere near the furnace. Or is it needed at all, at least for the filter drop.
2. Does the probe inserted above the heat exchanger and below the evaporator coil need to be anywhere specific in the space. My coil is offset to the left side directly over the heat exchanger (no room to insert it) but there is a lot of open space to the right of it that's probably not directly in the airflow.
Thanks
Very good explanation. Thank you.
How far down stream should i install the high static cut out Ahu
Daniel Greenwood not sure what you mean by “static cut out”? Are you referring to an actual high static shutoff, or a return bypass?
Yes High static shutoff, in the controls world we say cut out. I was having one of thise days were my memory totally failed me. But i finally remembered it installs closest to fan(blower) for best results.
Hey buddy maybe add a little energy to the lecture 😁
Francis Whiston I’m a facts guy...hard to be a character when discussing static😂
But I see you’re point