I'm developing a thermal model of the current Shuttle Extravehicular Mobility Unit (EMU) -- the Shuttle Extravehicular Activity (EVA) Spacesuit. I've been looking for thermal properties for same but can't seem to find a single source that contains all of them. The best I've been able to find is...
Hello,
I was wondering if anyone might have an opinion about Small-Disadvantaged Businesses (SDBs). Specifically, an opinion about stability, pay, and benefits. I have an opportunity to take a job at an SDB. The increase in pay is decent (~16%) but some of that will be eaten up by the increased...
Hello,
Has anyone looked into the effects of moisture/humidity on heat-transfer in air? Specifically, for high speed flow (Mach 1 and above) situations. I'm evaluating heater requirements for a device that deploys around Mach 5. So far, I've only looked at dry air conditions. I'm now interested...
Does anyone have thermal properties for an alloy referred to as Stoody Alloy #2? I've canvassed the internet but keep coming up empty on properties such as thermal conductivity and specific heat. I've calculated these properties based on a simple constituent relation (i.e., based on percent...
Does anyone know how to plot multiple sets of data in Excel that have different X axes. I have data versus time from flight measurements as well as predictions from a simulation code and I want to present them on the same plot. The problem is that the X axes (sample rate for flight data and...
I'm trying to write a VB Macro that will minimize (i.e., drive to zero) a column array of function values. There are about sixty values in the array. To date, I've been manually doing each array value using either "Goal Seek" or "Solver". This would be okay (time-consuming...
All,
Does anyone know where I can find (preferably online) a good reference for specular & diffuse reflectance properties. I have sulfuric-acid anodized, painted, and nickel-plated surfaces. Thanks.
Hello All,
Does anyone have any experience modeling thermoelectric cooler (TEC) devices and trying to predict performance? I've been using a lumped-parameter thermal analyzer (i.e., SINDA) to model these devices for a refrigerator. The problem is that I have to iterate between my SINDA...
Hello All,
Does anyone have any experience modeling thermoelectric cooler (TEC) devices and trying to predict performance? I've been using a lumped-parameter thermal analyzer (i.e., SINDA) to model these devices for a refrigerator. The problem is that I have to iterate between my SINDA...
Hello All,
Does anyone have any experience modeling thermoelectric cooler (TEC) devices and trying to predict performance? I've been using a lumped-parameter thermal analyzer (i.e., SINDA) to model these devices for a refrigerator. The problem is that I have to iterate between my SINDA...
I am using a finite-difference thermal solver to evaluate a transient heat-transfer problem. I have chosen an implicit forward/backward (i.e., central) differencing method. The problem is with the time step. If I choose a time step twice as large as the software calculates, I seem to get...
