How much refrigerant is in a mini fridge? engineering

We are building and measuring a refrigerator cycle. We are having a hard time finding out how much refrigerant is in a 1.6 cu ft mini fridge. Can anyone help?

Submitted November 17, 2017 at 01:53AM by jennyroohr http://ift.tt/2mxA0Rc engineering

A Design For Renewable, Off-Grid (stand-alone) Power Systems engineering

The electric power system is the network of power system components that delivers electricity to power televisions, refrigerators, computers, and every other device that plugs into an outlet. A renewable, off-grid power system is a stand-alone electric power system that can independently provide electric power to the end consumer year-round. A major milestone for designing off-grid systems is determining how much renewable energy resources and how much energy storage capacity are required to provide reliable electric power year-round. I developed an algorithm to determine how much of each component is required for a photovoltaic (PV), off-grid power system. The algorithm requires the expected time-series power demand of the building and power supply of the PVs.

As an example, the algorithm was used to design an off-grid system for a residential building. By considering oversized PV system sizes, the algorithm estimated the energy storage capacity requirement for increasingly oversized PV system sizes. The result was a graph showing how much energy storage capacity vs. how much PV was required for a renewable, off-grid power system, which shows an inverse relationship between generation and storage. Since PVs and energy storage have different costs, the algorithm computed the price of each off-grid configuration and determined the most cost-effective system (marked by the red "x").

The algorithm is currently in the development stage, so I published the algorithm on GitHub to contribute my results. I have also released any potential proprietary rights. Here is a technical document describing the algorithm and off-grid system: http://ift.tt/2gl9YxN

To give some background, I got this idea during my final year as a MSEE grad student. For about 6 months after my graduation, I tried to start an organization to research/develop this idea. Afterward, I started applying for jobs with little/no luck, so I decided to write this technical document to show hiring managers what I was working on. If anyone wants to provide feedback on my document (or current situation) it would be much appreciated. Thanks

Submitted August 29, 2017 at 04:15PM by LiveWithEarth http://ift.tt/2vo2tNc engineering

What are the blue or orange colored scotch tapes called that you remove before initial use of a printer or refrigerator? engineering

No text found

Submitted August 05, 2017 at 01:47AM by W1nd http://ift.tt/2u90cRC engineering

I need help with information on an old thermometer. engineering

Hello r/engineering. I come to you looking for information. I have an old Bristol model 144 refrigerator temperature recording device. I'm trying to find the age of it. I searched through various old catalogs by the manufacturer and couldn't find anything. Here is a link to what it looks like.

http://ift.tt/2l1A3iN

Basically I'm trying to learn how old it is. If you can help, I'd really appreciate it.

Submitted February 21, 2017 at 06:21AM by sambaranoff http://ift.tt/2m2hwY5 engineering

Amperage or current? engineering

I'm currently searching on the internet for some specifications on a lab refrigerator to estimate its energy consumption. I was confused when I saw two different entries: Amperage and Current.

My question: How are they different? What do they mean? How could I estimate the refrigerator's energy consumption from these values?

Edit: Here is the data sheet: http://ift.tt/2dVk0Ra

Submitted October 06, 2016 at 09:19PM by gierojj http://ift.tt/2dvDLR4 engineering

Rubber Band Refrigerator engineering

https://youtu.be/lfmrvxB154w

Submitted August 29, 2016 at 01:06PM by g2n http://ift.tt/2bubA3v engineering

Question on cooling smoke efficiently engineering

What would be the most effective way to cool smoke? And on that thread air in general? I have a basic knowledge of how refrigerators work by having a cooling coil with fluid inside which absorbs the heat from the inside with perhaps a fan to distribute it but is there also a reason cooling coils are a helix versus a different shape? (More surface area to touch the air maybe?) and can you cool it faster by filtering the smoke through water? Assuming you had cold water to filter it through would that be most effective? But cooling water takes way more energy than air so which would be faster/more effective? Assume you work under the constraints of the device being any shape but it has to be under 1 m³ and you have a 200 dollar budget but you can use it as you see fit (I.e. Going to a junkyard and ripping cooling coils off of a refrigerator etc.) aesthetics don't matter, just functionality.

Submitted May 06, 2016 at 11:57PM by beadlers http://ift.tt/1WeLHH2 engineering

How does a refrigerator works? engineering

https://www.youtube.com/watch?v=EIP3pSio7-M

Submitted March 13, 2016 at 12:19PM by konomashi7 http://ift.tt/1LjTT4J engineering

How much tetrafluoroethane is needed to cool refrigerators per square inch? engineering

Additionally, how much of the gas would be needed to keep an area cool for 6-10 hours?

Submitted January 19, 2016 at 09:32PM by Sappledip http://ift.tt/1Ry0WbD engineering

Small Open Drive Refrigeration Compressor engineering

I'm working on a project right now to create a human powered (hand/pedal powered) miniature refrigeration system running on the vapor-compression cycle. We have already built a "proof of concept" version that uses an A/C compressor that we ripped out of a car in a junkyard! Now, we are moving to the prototyping phase, and we have reached a large hiccup. It's surprisingly difficult to find a small open drive refrigeration compressor, and I was wondering if anyone here had any leads on where one could be found.

Some details for ya:

Our refrigeration system will only need in the neighborhood of 15 W of cooling.

We are working under the assumption that a human can provide around 40 W of input power.

The compressor needs to be small: at least half as small as a car's A/C compressor.

The compressor needs to be open type: mechanically driven (gears or belt- not electric like a household refrigerator).

The compressor needs to handle a pressure ratio of at least 1:5.

Thanks!

Submitted December 01, 2015 at 11:11PM by jamie_giraffe http://ift.tt/1TrJwev engineering

Small Open Drive Refrigeration Compressor engineering

I'm working on a project right now to create a human powered (hand/pedal powered) miniature refrigeration system running on the vapor-compression cycle. We have already built a "proof of concept" version that uses an A/C compressor that we ripped out of a car in a junkyard! Now, we are moving to the prototyping phase, and we have reached a large hiccup. It's surprisingly difficult to find a small open drive refrigeration compressor, and I was wondering if anyone here had any leads on where one could be found.

Some details for ya:

Our refrigeration system will only need in the neighborhood of 15 W of cooling.

We are working under the assumption that a human can provide around 40 W of input power.

The compressor needs to be small: at least half as small as a car's A/C compressor.

The compressor needs to be open type: mechanically driven (gears or belt- not electric like a household refrigerator).

The compressor needs to handle a pressure ratio of at least 1:5.

Thanks!

Submitted December 01, 2015 at 11:11PM by jamie_giraffe http://ift.tt/1TrJwev engineering

Open refrigerator engineering

If I left my refrigerator door open would the kitchen cool down or heat up?

Submitted May 14, 2015 at 03:58PM by Luna722 http://ift.tt/1IzZuRj engineering

What ways are there to attach something to this linear bearing rail? (For a CNC) engineering

I'm building a small CNC. Moving bed X axis, moving tool Y axis.

I got these linear bearings at a thrift store yesterday: http://ift.tt/1cmcOef

I think they're from a refrigerator drawer that was made to perfectly fit around the rails.

I don't have enough faith in my welding abilities to tack on bolts without warping the metal, and I can't drill holes in it for bolts as it would likely result in ruining the bearing's smooth slide all together. I have "clip clamps" (pictured) but they would not likely hold tight enough without cranking them down to the point of compressing the slide.

There's a hook on the top left and a little nub on the far right (away from the camera). There's a hole on the inside right side.

This will be attached to a wood frame (the one in the picture).

What would you do?

Submitted May 10, 2015 at 09:00PM by -Mikee http://ift.tt/1JZ4ZJJ engineering

Engine Block Refrigerator engineering

I had an idea to build a refrigerator out of an engine block for my dad. My idea was to put a beer in each piston slot and keep it cold. The problem is that I do not know how to do it, or how much it will cost. Any ideas?

Submitted January 09, 2015 at 02:13AM by mumstead3 http://ift.tt/1tRlSjA engineering