Good day, everyone. I would like to ask how to calculate the heating element type, wattage, and amperage needed for making a DIY deep fryer.

 

why calculate? someone already did it. deep fryers are everywhere and many are dirt cheap. so if you insist on making one your self, find one you like and read the specs. i just compared few units and they all are 1500-2000W and reach temperatures up to 190degC (374F). how hard was that?

 

It’s for our thesis. We have a machine combined with an electric deep fryer, which is why we need calculations since we are using 40 liters of oil. This way, we can avoid using overkill materials and save money.

 

Just out of curiosity I poked around online.
40 liters of oil = 10.56 gallons
10.56 gallons of oil is approximately 79.2 pounds of oil (give or take depending on the actual weight. I used a generic vegetable oil number I found online)
The closest commercial fryer has a capacity of 60 pounds of oil and is rated at 17kW (https://www.webstaurantstore.com/fr...-controls-208v-3-phase-17-kw/36911814ECC.html)

 

Don't use any oil that says "blend" or a combination of oils. Many of them use a glycol to keep the oils together, and the smoke persists more than vape.

 

it does not matter what the process is, you need to determine amount of work to be done (W) and time in which it is to be done (t).

Energy to do the work will be E=W/n where n is efficiency (0-1 or 0-100%). you can decrease losses (and increase efficiency) by insulating the unit. then power is P=dE/dt.

now that you have power, you need to look at type of heating element. if it is resistive 3P unit and you know the supply voltage, you can calculate the current.

 

Good day, everyone. I would like to ask how to calculate the heating element type, wattage, and amperage needed for making a DIY deep fryer.

Don't make your own deep fryer, no need, very risky and kind of accident, structural breakage or tipping over is absolutely deadly for people, kids and pets, don't do this.

Why are you looking to build one???

 

Don't make your own deep fryer, no need, very risky and kind of accident, structural breakage or tipping over is absolutely deadly for people, kids and pets, don't do this.

Why are you looking to build one???

#3 holds the answer. It's for a custom machine for a thesis. As far a being dangerous in any way all it takes is a bit of common sense to make it as "safe" as any other vat of scalding hot oil on the market.

 

It is indeed a design project, so no "rules of thumb", every number needs to be generated. But first they need to decide the temperature and the mass of oil. Then Q= (Mass)x (specific heat) (change in temperature.) Then the change in (Q) per time. The pain comes in calculating the heat transfer. I read the textbook, (sort of) Heat transfer is difficult to quantize, so they must also read and understand about that.
THAT project is complex enough that I am thinking is is assigned. Good luck. ( I just listed the easy parts)