Engineering

Hi everybody I have a question about a solar-assisted cooling system ,used to cool milk The systeme basic components are electric compressors and an absorption machine, When optimizing the compressor cycle, by lowering the temperature in the condensor, an important saving of energy can be made...........this lowering is the result of introducing the absorption machie ............; my question is: how does the lowering of temperature in the condensor influence the electric energy consumption? i mean how could it be calculated? for instance, if the compressor cools a volume of water at 7°C (instead of 9°C) to bring it to 2°C (knowing its capacity (2500kw) effi…

Hello, everyone! Does anybody know what kind of sawmill waste is used in building, especially in creating of insulation materials? I know that tree bark is used, but I can't find an information about researches and experiments in this theme. Any help here would be appreciated!)

context taken from here. I am not law student but engineering student but we have to study this in our subject called engineering professional practice and I got confused so asking this here... source-:

I want to know the significance of the number "230" for the general household electric supply. Why "230" why not anything else?????

How does a couple of birds take out an entire Boeing 737? I would have figured the engines could chop up the birds into little pieces without too much of a problem. http://en.wikipedia.org/wiki/US_Airways_Flight_1549

Here is something that has held my interest for a while now. I was reading my thermodynamics textbook and there was a short article that mentions an experiment involving nanoparticles where the second law did not apply for up to two seconds. It then gave this citation [Phys. Rev.Lett. 89, 050601 (2002)] . If you would like read the topic more in detail here is a link to a description of their experiment http://www.aip.org/pnu/2002/split/598-1.html . I have asked my thermodynamics professor what he thought of it, but he didn't want to believe it. I asked my modern physics professor that does research in micoelectromechanical systems (MEMS) and he was not surprised. I am ju…

I sense that few viewers or contributors look at and consider examples of either existing Engineering or proposed solutions as posing either poor results or needing improvement through further consideration. In less words, as an Engineer, I look for, and often find, examples of engineering results in products which are poor or improvable, and that troubles me. Would it not be valuable for both up-and-coming Engineers, as well as established ones, to discuss method and product improvement possibilities in this Board? imp

Hello all. Having a problem with 'tile' meaning a perforated pipe. But hey, it is English and am not the one to fix it 🥴 [ Image borrowed from the net.] Unsure of positioning the perforations under the pipe half for proper drainage. Seems like the gravel below the perforations level will always be flooded, (never flowing upwards to drain into the pipe) Shouldn't the pipe have no gravel under it, and perforations on sides ? What is the rationale ?

"Mining the Sky" for Earth? Why is there only talk of bringing it back down to Earth? What would we even do with such resources? Most Sci-Fi resides beyond Earth. Megastructures are under my eye (i.e. spaceships, Dyson spheres and artificial worlds!) Zero-gravity provides a very free medium which should simplify automated construction. Automatized production systems could be highly modular, reproductive and self-maintaining; principles which yield a system capable of building virtually anything we can imagine that is theoretically-feasible! I think we should do our best to live within the confines of Earth and crunch down as much efficiency as we can bef…

Hi, I'm sorry to bother you all but I'm in need of some assistance. I need a calculator or spreadsheet that can (trough approximation) determine the percentage of certain components (within an error margin) needed to have a specific final solution. An example of a possible use would be creating a medicine or a feed for an animal. You have your list of ingredients but each ingredient has a list of nutritional details and these may have another sub list. You want a final solution with A amount of energy, B - fiber, C - protein; From the proteins you want a specific amount of a few amino acids. I would like anyone that knows any programs that are capable of determi…

I know now that making a full on vacuum airship is unfeasible for it's compressive properties. So why not just make a rigid airship that is evacuated enough that the hydrogen is no longer significantly dangerous to it's surroundings, using say 25-30% density of neutral hydrogen? What's the weakest compressive material I cod use for that? Could I, in practice make any rigid, non-curved part out of a honeycomb-like structure of LDH-cells? This could be revolutionary in creating lighter weight rigid parts where volume isn't too sensitive and lighter weight is an advantage. Can someone give me a formula(and tell me all the dependent/constant variables) to get real values…

So two tradeoffs came to mind recently... the tradeoffs between subways and elevated rail, and the tradeoffs between solar panels and thermal solar. So I figured I'd put them in the same thread, in case any more come to mind, or in case anyone else has any they'd like to share. So of the downsides I've heard of to elevated rail, the most common I hear of are the noise, and the temperature fluctuations causing rail defects. However, I weigh this against two advantages. One, you see the town outside your window instead of only the tunnel, which, scenery for scenery's sake notwithstanding, has the added benefit of you not having to pay quite as carefu…

Hello, I'm currently doing 3D mixing in a computer programme called Ansys. I have a cylinder full of water, featuring a square cuboid of calcium (the rectaungular cuboid is a stirrer bar, and the smaller cylinder is a mixing zone. I have gravity defined as the standard 9.81 m/s2 downwards) : I have the mixing set at 60 rpm at the moment. I find that, after 2.5 minutes, my calcium is down around the bottom (this is a volume fraction graphic, with more blue meaning higher fraction of water, and as the colour leans into red, you have more calcium) : Then, as the mixing continues, the homogeneity of the…

Why they don't seal the turbines inside a vacuum? By watching this clip, https://www.youtube.com/watch?v=WTt_hoWtMIc, is clear that a wheel would spin much longer inside a vacuum. So, let's say that you use a normal wind turbine (or solar panels) to activate 10 other turbines sealed in a vacuum. It would be like multiplying the energy. What do you think?

Hey guys, A friend raised my attention to this article about solar energy. The article itself (very short article) wasn't the issue, but rather the first comment (lonnng comment, apparently copied off of some other publication about Zenith Solar). Some people told me that this is fake, and doesn't follow science or physical principles - but I am not sure I have enough background in Solar energy construction to judge for myself, so I immediately thought of you guys here in the forums! Help me out here.. can this be real, or is this a fake hoax/fraud? Again, I'm only relating to the comment, not the actual blog post. Thanks ! ~moo

A Chilean LATAM Airlines LA800 flight from Sydney to Auckland NZ suffered a ‘Technical Event’ on Monday that sent the 787 Dreamliner jet plunging 500 feet in an instant, injuring some 50 passengers, 12 of whom needed hospital treatment on arrival in Auckland. https://www.nzherald.co.nz/nz/latam-flight-from-sydney-to-auckland-nose-dives-passengers-and-crew-thrown-into-ceiling/MBE4BNFIFJD73DDZJ3USYZYL5M/ Passengers subsequently told reporters that the pilot had apologised to them after the incident, and said that he had lost control of the plane after “All the gauges went blank”. The nature of this technical event appears to be related to an AD (Airworthiness Dir…

Hi everyone, I have a problem at the moment with a PWM Controller (IC) uc3844 and I am wondering if anyone out there has any experience with them. I am using it in a Flyback converter Power supply circuit to switch a Mosfet but I am having great difficulty getting it to switch. it seems that the Voltage feed back is getting 2.5V which is max through the chip but it is meant to be an input not an output. i think that the Error amp inside is fried but any help on the situation would be greatly appericated Cheers, MD :confused:

Hi, everyone... this is my first Thread, I'm 16 years old and have an intrest in science. Anyhow, I'll get to my subject: Nanotechnology has advanced throughout these years, yet it is still a new technology that didn't even start to shed its light to our world. I have this idea of a spray that shoots out nano-bots which attach to each other forming a blob in the air. These bots would be light enough to stay aloft, or would have built-in engines that keep them flying. they would react with the air (O2, CO2, N,...) creating a sheild preventing objects from entering the perimiter of the blob. I know this may sound like nonsense, but it may have other uses such as cleaning…

Hi all, I am designing a power supply to allow me to continuously vary the voltage to an atmospheric plasma rig. I intend to amplify a signal from a 10 V signal generator source by means of a continuous amplifier (operational frequency 0-90 khz) to c. 300 V 5 A output. To be able to maintain a plasma under our conditions it may be necessary to boost the voltage to c. 5-6 kV. This I intend to do by means of a transformer. I have been searching for a design that may suit but am finding it difficult to obtain one. Can anybody offer suggestions? Niall

Just curious to know if and to what extent(heat) a 1.55v battery or battery similar in size (watch battery) would be capable of producing using a wired coil; small also in size? Any ideas, suggestions, im just dumb would be helpful. Thanks much

What happened to the gadolinium refrigerator that seemed promising about ten years ago, has any improvement been achieved ? What is the current status/progress, does anyone know ?

I own a 2007 toyota corolla (stick shift ). The engine is a 1.8L with a 10:1 compression ratio (stock). Should I be using 87 octane or 89 octane due to the 10:1 ratio? ~ee

So Leonardo Di Caprio and Mark Ruffalo (The Hulk) both raved about this Jacobson study, but the NAS identified it was flawed and overestimated the potential for hydro storage by 100. If that's the case, no wonder I have plenty of questions about the Baldwin, Blakers and Stocks Sept 2018 which recommends pretty much the same thing: wind, water, and solar for Australia. Until recently, I used to be concerned that the energy costs of building all those pumped hydro batteries were too high based on the Weissbach EROEI study. But friends here spent some time showing me how that study is based on some really old data and the EROEI of solar PV has improved remarkably since that …

As part of my ongoing pursuits I have contemplated locking down the designs for an oscilloscope! Despite pressure towards more rational goals made by my superiors I am looking at a design expectation of 100GHz. The first step I have taken in beginning the design process is to find a micro-device that a design could be implemented around which serves as the primary device for taking measurements. After some investigation I have found that Analog Devices produces a device that can operate at 10GHz and is moderately priced and will meet design budget. Originally I had wanted to scope for a 128bit bus for detailed card and board analysis but this would be a project far ou…

Hello, I am looking for material to make a screw type press, or maybe a wedge press. This has to fit inside of a 1200 Celsius oven for 12 hours. I'm pressing a carbon based material to cure it. The press atmosphere will be in a vacuum with an inert atmosphere (argon). Thanks,