Hi, I'm a hobbyist interested in thermal imaging. I have a budget of about 1500$. I'm trying to make a robot and incorporate an IR camera into it. I'm wondering what IR camera/Microbolometer I should be looking at given these parameters:

• 1500$ budget
• 1-3M range
• Able to differentiate temperature difference reliably of up to 0.5C (aka reliably differentiates between 36.5C and 37C) @ about 30C room temperature.

Thanks all!

Number of Transfer Units (NTU)

NTU = UA/C_min

Why is C_min used in the formula of NTU. Why not C_max?

I understand that C_min fluid can undergo maximum temperature change. But how's it related to NTU?

I'm trying to reduce the water treatment cost. I'm interested in reducing our usage of oxygen scavenger however i heard it's really hard to measure the dissolved oxygen in water.

If I run the set pressure in the deaerator at 25 psig, should that be sufficient?

In case of a DCS issue/ Electro-Hydraulic Controls issue in the GVs that might cause it to not fully open, what could a newbie operator (like me) expect to happen?

This is about the relationship of dissolved oxygen and pH in boiler water. Is there any, if at all?

This is NOT a job seeking post.

I'm a UK-based industrial gas boiler engineer and I mainly work on burners and boilers up to about 6MW per boiler. I also do some other things like gas-fired warm air units and so on.

I'm looking for anyone who does the same sort of job in/around Seattle or WA in general (or even in wider USA really) to get some advice. As I said, I'm not looking for a job, just trying to scope out the potential market and requirements before I commit to doing something crazy.

This is a post for my fellow Plant folks:

Anyone have much experience with in-house M&D efforts? Or, is this something your company out-sources (B&V, GPstrat, etc etc...)?

Does your M&D mainly M and not so much D? Or are there engineers in the M&D center that do more diagnostics outside of any modeling or APR already going on?

Any/all feedback is appreciated. Kind of a specific question, but trying to understand some simple base lining.

Hello guys,

I would like recommendations on Boiler Superheater and Economizer Design Software.

FireCAD is rejected by Engineering Department Manager, he said "its too simple"

Please advise

Conceptually, a high ratio of specific heats means a greater Cp over Cv. This means that during a non constant volume process, a larger portion of energy is used for work on the surroundings.

I have a small boiler we use for our process that makes low pressure steam.

What conductivity should I have it run at and why?

I have been tasked at work with figuring out if the humidity inside our cure ovens is effecting the adhesion of our parts. Our plant is climate controlled to be at least 30% RH in the winter but we don't have dehumidifiers for the summer months. Our ovens are at a constant 105C and vented at the top and bottom. I'm having trouble understanding what happens to the moisture content of air above the boiling point of water. Could an increase in outside humidity cause an increase inside the oven? I have a data logger that tracks the conditions inside the oven and currently reading 104.9C, 1.8% RH, and a dew point of 9.3C. Our plant atmosphere is at 20.8C, 32.5% RH, and 2.8C dew point. I'm a little foggy on my Thermodynamics so any help would be greatly appreciated.

https://i.imgur.com/cIrhZd5.png

Say the sleeper gets hot flashes during the night, and needs material with a very high heat transfer to transfer this heat away so the sleeper doesn't wake up. Which material should the sleeper use for: the blanket, the sheets, and the pillow case ?

I would think the moisture management is irrelevant but I'm not exactly sure. I think the average person loses a pound of water each night, mostly through breathing but also through some sweat as well. For this question we can assume that this isn't a particularly sweaty sleeper (no night sweats). OR we could get a prediction for each case.

Details on the testing:

Testing. Before testing, all samples were conditioned. For each type of test, three replications were performed. The different standard methods American society for testing of materials (ASTM) and American association of textile chemists and colorists (AATCC) were followed to perform different tests. ASTMD2256/D2256M—10e1 was followed to test the tenacity and elongation percentage of yarns by using Yarn Tensile Tester (Tensojet, 2000). For the tensile strength of fabrics (150 50 mm2 ), ASTM D5035—11 was followed by using tensile strength tester. Similarly, for tear strength of fabrics (100 63 mm2), ASTM D1424—09, 2013 was followed. Likewise, ASTM D737—04, 2012 was followed to analyze air permeability of fabrics (20 20 cm2) by using air permeability tester M-021A SDL Atlas, UK. Similarly, AATCC test method TM (195) was followed to know the liquid moisture management properties of fabrics (8 8 cm2 ). In the same way, ASTM D1518—14 was followed for measuring the thermal resistance of fabrics (30 30 cm2 ) by using thermal resistance tester M-259B SDL Atlas, UK.

Source:

The Mechanical and Comfort Properties of Sustainable Blended Fabrics of Bamboo With Cotton and Regenerated Fibers, Abdul Basit et al. https://doi.org/10.1177/0887302X18782778

My predictions:

For Blanket: Tencel. Though Viscose has a lower thermal resistance, a very large surface area of Tencel will be exposed to air, which can facilitate a lot of heat transfer.

For sheets: Viscose. The sheets are mainly not in contact with any air, so the thermal resistance would dominate the heat transfer properties of the sheets.

For pillow case: Maybe viscose? Some of the pillow is exposed to the air, but most of it is not. Lets say that the pillow has some air permeability as well. I would imagine that the thermal resistance is still the more significant factor, since in the graph, the difference between the thermal resistance is much more significant than the difference in air permeability (as far as I can tell).

Thoughts?

Let me know if you need any other clarifications.

Hi Everyone. The Integrated Engineering Blockchain Consortium built a blockchain called CoEngineers.io and we're looking for engineers that may want to participate in the alpha test program. Any interest? -Dan R, PE

how does it know how to eject entrained air vs steam? how does it know the difference? is it like a mini condenser that is vented to atmosphere?

I'm planning to learn about piping in extreme conditions which includes mechanical and thermal stresses, and also subject to conveying pressurized liquids. Can you kindly recommend me a book which tackles analytical design for such besides multi-physics simulation?

Thank you so much in advance!

Hi,

Regarding the thermal issues of laptops, I was thinking about the most effective solution to try to cool them down.

All market coolpads are mainly simple plastic grids with fans. I seriously doubt it could be effective and think it’s much more pure marketing products.

I was wondering finally if using a large heat aluminum or copper heat sink plate as a laptop stand would perform much better especially with laptop which have aluminum enclosures like MacBooks?

According to you which solution would perform better ?

Some users did benchmarks with laptops in a fridge but not a really usable solution :)

I was thinking first about trying to build a kind of Peltier coolpad but finally thought about the metal heat sink.

Not sure if this is the adequate sub to ask this but I think I could have real expert answers here rather than on Apple or MacBooks subs.

Thanks for your lights

Any Veteran Control Board here? Preferrably for older model of coal plants (subcritical boilers)? Would appreciate any tips/info you can share.

I just noticed that the efficiencies for different combined cycle gas plants are given as steady state. I'm not sure how much this effects real world gas plant efficiency.

Hi folks,

I'm a Chemical Engineer working at a company which is primarily focused on Chemistry at PWR/BWR plants. However, I am constantly involved with some sort of thermal performance monitoring, and am working on trying to break into the field. I'd like to help performance engineers using scripting packages such as Matlab for monitoring and optimization. I'm looking for some resources to help me get up to speed on Thermal Performance fundamentals specific to nuclear power plants as well monitoring/trouble shooting techniques. Any books or resources you guys can share will be very helpful. Thanks,

Edit: Thank you for the recommendations guys/gals

A 3 tea light essential oil burner, simmers water and oil with noticeable vapo...ur, is there any chance on earth, more vaaape would emit than flame could dry? Is it possible to humidify with flame? I was getting too lengthy for google so, yeah. Interesting science currently over my head.