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davefitz (Mechanical My thoughts are that method of characteristics is the way to go. An over-simplification is an analysis of a shock tube open to the atmosphere. Perhaps this topic should be discussed on another forum.

Pederator (Mechanical) I'm looking at transient flow in discharge piping downstream of a safety/relief valve.

Referring toPEDARRIN2 (Mechanical)post. It is how fast or slow the valve opens.

monkeydog (Aerospace) Thanks

Can someone explain the advantages of purchasing NIST steam tables as opposed to going to their website? Thanks

Other than structural, what criteria should be used in designing Safety/Relief Valve Discharge piping? For example: Flow velocity, pressure drop, quality (if two phase),etc. Thanks

PEDARRIN2 Do you have piping downstream of the valve in question? If so, the t=2L/a does not consider that piping. Then you could include valve flow area vs time and downstream hydraulics. Sailoday28

Final temp in low press cylinder is approx 246F based on assumptions of perfect gas, adiabatic ----no heat trans to gas in either cylinder equal volume cylinders constant specific heats hp cylinder initial condition 100 atm, 70F lp cylinder initail condition 1 atm, 70F lp...

To do your last problem You need internal volume of each cylinderInitial temp and press of each To get fastest time Provide minimum flow area connecting vessels. I would then assume the gas in each cyliner to be adiabatic. Therefore the source cyinder will follow an isentropic process...

With regard to your last question. If you submerge your tanks in water you will have Joule's experiment. Use those equations on internal energy to answer the quasi static flow process coupled with the dynamics of the compressor and flow resistance. Regards

ione A can vary. In my formulation, I use G, which is the mass flux or W/A. Regards

zds04 Consider a perfect gas with constant specific heats undergoing an isentropic process. Energy equation ao^2= a^2 + (gamma-1)/2 *u^2 where a= sound speed u= local velocity and subscript o stagnations coditions For isentropic process (rho/rhoo)= (a/ao)^(2/(gamma-1)) Substitute...

ZDS04 Sorry. But Choked flow occurs when the mass flow will not increase as back pressure is lowered. AND upstream conditions are fixed. Regards

I wish to achieve both saving cooling energy in the summer and heating energy in the winter.

We have a lobby in our appartment building that has hvac. Volume and height of the lobby are relativley large. How can I determine if there will be an energy savings by installing reversible overhead ceiling fan(s)? Thanks in advance.

You will have to get a handle on the mass removed. If the air withdrawal is relativey fast, you can use an isentropic process. Is slow, use isothermal. Regards Sailoday28

Is there a way to estimate an air conditioner COP vs outside air temperature?

Sorry, I will use CDD for summer kw-hrs. CDD*24 = hours. DesignTons*hours /SEER =kw-hr Regards

What is a realistic temperature to use for CCD? I will be using the hours in conjunction with SEER to estimate future cost for KW-HR for a heat pump. Also how many years back should be included, ie 2012,2011 ,etc? Thanks

I believe your first formula is based on choked flow. Regards