Sorry for the dumb question, but the answer isnt as easy to find as you might think.....
Can someone tell me the standard units for airflow in metric correlating to CFM? M^3/sec, M^3/min????
What about water flow? L/s?
Thanks
THANKS FOR THE INPUT. I WAS SECOND GUESSING MYSELF, BUT IT LOOKS LIKE I MADE THE RIGHT DECISION IN ISOLATING THE TWO DUCTS.
BTW TOMBMECH: THE LINK YOU POSTED IS VERY INFORMATIVE
THANKS AGAIN
IT IS COMMON TO HAVE A DI-ELECTRIC UNION ON COPPER TO STEEL PIPE CONNECTIONS. IS THIS NECESSARY FOR DUCT CONNECTIONS AS WELL? MY UNDERSTANDING IS THAT THE WATER IS THE CATALYST FOR THE CORROSION, BUT CAN MOISTURE LADEN AIR PRODUCE SIMILAR RESULTS (I.E. COMMERCIAL DISHWASHER EXHAUST?)
THANKS FOR THE ANSWERS. IT MAKES SENSE THAT EVENTUALLY ALL THE POWER INPUT WILL TURN INTO HEAT FROM FRICTION LOSS. PLUS THE LOSS OF HEAT FROM MOTOR INEFFICIENCY. THAT BETTER EXPLAINS THE CHART THAT SPECIFIES WHETHER THE MOTOR, EQUIPMENT, OR BOTH ARE IN THE CONDITIONED SPACE, AND IF A FAN OR...
it is not "uncommon" practice to use a 5 ton blower (around 2000cfm) and evaporator coil with a 4 ton condensing unit. If it is a heat pump application, i might stray from this approach due to volume mismatch during refrigerant charging. Check with the equipment manufacturer.
Something else to...
ASHRAE Fundamentals has a chart that says that an electric motor driving a fan generates as much heat as the the total power rating of the motor plus the inefficiency of the motor (assuming the fan and the motor are both in the conditioned space). This seems to negate the energy balance that...
Does anyone have any suggestions on the proper fire prot. system for an industrial cure oven for a paint line? (Can't find anything specific in NFPA, please direct)
This is a fairly large building with ovens on the mezzanine and is not fully sprinklered currently.
thanks0
Thanks to all for the input. I intend to decrease the inlet temperature on hot side to maintain LMTD and assume similar U value. After this, I will field adjust until I reach the requirements for the process water.
Roach
MonteMayor,
To be more specific and accurate, yes this is a typo.
Cold out is 185ºF.
And, actually after further thought, I would prefer to not have to manipulate flow rates, although that was the intention originally. My apologies for any inferring.
25362,
Yes both fluids can be assumed to be...
I have an existing shell and tube HX with the following design values:
190 GPM both sides
Hot inlet 220ºF
Hot out 200ºF
Cold in 165ºF
Hot out 185ºF
I want my cold in and out to be 140 and 160ºF
This increases my LMTD from 31 to 48 (includes correction factor for hybrid design). At the design...
Great explanation.
Thanks for the clarification.
"Common sense" would make me think that increasing the static pressure(fan)/head(pump) would require more torque from the motor, but as I understand it, it is all related to the total work being performed by moving the mass.
Maybe my...
