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Hi, I had a random question about velocity pressure measurements. How come the static pressure sensing holes on the paragon controls airflow pressure sensing elements are next to the total pressure...

Thanks! :cheers:

Where does the 8502, 20033 & 20034 object type determine?

Hi, I'm working with phoenix controls Lonworks Network Variables and need help understanding how the valves communicate. It's all jiberish to me to be honest.

Anyone familiar with this stuff? I...

I have an actuator that's rated for 24volts.

What happens if I connect 18 volts to it?
My friend said it would move slower because it's not happy.

What happens if i connect 48 volts to it?...

Thank you klove. I appreciate your advice and your posts and everybody else that posted. All of it got my wheels rolling and now i gotta keep it rolling. :)

You are correct, I don't have any experience. I just graduated and am interning at an MEP company. But there are experienced people on site that make the decisions. What I know is that I like central...

VFD compressor maybe?? :confused:

How would the chiller know when to lower the condenser temp and pressure? Is that something that comes with the chiller control system? Ill get you that pump curve.



Shoot..I wasn't thinking...

According to the sales rep, operating the pump at 150gpm would heat up the motor and reduce its life. But what you said makes sense. I can keep the gpm at 600 and avoid fouling. And compress my ref...

My apologies for being unclear.

The chiller plant is composed of two 600 ton and a 200 ton chiller. They are running three pumps on the evaporator side, two of them are 1120gpm and one is 600gpm....

would you recommend staging the condensor loop of a chiller with cooling towers? the evaporator side is staged with two 600 ton and 200 ton chiller and three pumps.

crazy..that is definitly something worth envying. he gets to fly and skydive. i would go skydiving but i dont like another guy sticking to me as i fall.

Toshibas improved. I have tosbiba from 2002 that is running fine and my family has two other toshibas that are working fine. The one i have is vented from the side but the two my family has is vented...

I agree with alot of things people said on here. It depends on your application. If you want to get down with engineering software that does rendering then get something with an i7 and 8 gigs of ram...

I understand what you are saying..mostly. I studied COP and abs temp in thermo. But is ref. flow reduced because the compressor is compressing a lessor volume of ref. to a higher pressure and...

Is hot start-up when the empty building starts heating up since the temp fell below a specific set point, before the building is occupied? Also when you wrote "series piped set of units" would that...

Got it..thanks! :)

Is the loss of chiller/condenser efficiency related to the higher delta T? I am thinking that a higher outside temp would mean a higher return water temp and a higher delta T for the chiller.

kaleun,

Your are correct. My cooling load on average is 40% of max load. The building is high rise (13floors) office building located in los angeles and the hours of operation are between...

this is off topic.....but how much hvac work is there in ship building? i have been doing hvac for buildings for a while and it doesnt rock my boat as it used to do. Trying to see what else is there.

stupid question:
I am assuming that you won't be able to perform pipe freeze operations on water systems since water expands which would crack the pipe?

I calculated the max cooling load (tons) and total monthly load (ton-hrs) using trace. it comes out to be about 40% of the utility company charged the building for. i wish i had a way to monitor the...

Assuming that you recover 100% of vapor into liquid, then it should add up. I havent got the chance to see or use a recovery machine but there could be some percentage of vapor that is lost in the...

Friends,

I have acquired information regarding the chilled water load of a building. The info is in ton-hrs and is broken down based on the monthly consumption. I also have the utility cost in $...

I have AutoCAD MEP 2010 64Bit

I laid out some diffusers on autocad. I brought the layer that the diffusers were on to the top and sent the other layers to the back. However, when i print, part of the diffusers are not showing. I...

Robotics is cools. I made line-follower robot and it was fun. It helped me learn alot of electrical hands on work since I havent had any intro to electrical work. I took an intro ece class but it was...

i kinda get it now. I knew that there would be heat loss but did not know how to handle the issue. some of my team members are using trance700 to figure out the heating and cooling loads for the...

Thank you everyone for your advice and encouragement. I do my best not to put people down because I have a degree or anything or because I am better since I gotta a degree. A degree is just a paper. ...

I got a hold of the fundamentals book and looked over an example. They referred me to the ASHRAE 62.1, Table 6-4 which has the exhaust rates for public restrooms to be 50/70 cfm.unit. But it doesnt...

Dear Friends,

I have 3 months left to get mech. engineering degree and I just figured out that I would like to get deeper into HVAC stuff. I took an HVAC class which opened my eyes to the greater...

My engineering manual doesnt cover toilets.

Hello Friends,
I am working on sizing a HVAC system for a museum located in Pennsylvania. I would like to know how others would provide a warm restroom environment during freezing weather.
I...