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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

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.

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

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'm told that motor has to be same as original equipment. I would hope to replace motor with one of high efficiency. Carrier AC model 38AE044570. Is it possible?

Are there any sealants that will reduce leakage from small size Heat Pumps (1-2 Ton Capacity)? Also what is your experience with these sealants?

For gas line flow losses is isothermal flow the norm?. If not, what thermal considerations are given in determining fluid flow hydraulic losses? Regards

What is mass flux? I'm looking for the derivation or basis for choked ISOTHERMAL FLOW from a large reservoir thru a nozzle. Friction should be neglected.

How can dp be approximated at near choked flow in vicinity of silencer?

Based on Wikipedia, Choked flow Using pv=zRT and constant specific heats, choked flow is proportional to the term sqrt(gamma/(ZRT) where Z is stated as constant. That Z corrected for the term rho*P The z apparantely corrects for compressibility of the gas. However for pv=zRT where Z is...

Why in Tech Paper 410 1979 edition pg1-9 is max velocity (following discussion on isothermal flow) described as sound speed? This is upstream of discussion on adiabatic flow. Will readers think that max exit flow condition for isothermal flow is at Mach = 1? Regards

What vendors have a program capable of solving transient problem of instantaneous pipe line guillotine rupture?

Sizing of orifice? Reference thread124-139392 Why would engineers use a perfect gas formulation to determine flow rate of saturated steam (inital state) that will pass through an orifice?

I have a 2 cylinder 11HP universal (5411). Recently overhauled by engine compartment has vapors when running. I was told this is blow by from the engine. What is blow by? Is there a way that I can recirculate the vapors, by fan, into the air intake?

Can a polytropic process define a problem in which flow occurs? pv^n = constant I raise this question because I have been under the impression that this process is where the mass remains constant and there is no flow. For example, the compression or expansion stroke of a reciprocating...

I have asked this question before. It seems to me that final gas temperatures during compression are based on an isentropic process and an ideal gas (pv=rt and cp/cv =constant If so, why not consider real gas effects? Also, is there a way to consider efficiency of the compression process?