Hii everyone ,
In previous posts i discussed about a cooling system using a co2 gas . Mixing the gas with the air coming from a tank and then back to the tank(i am adding a sketch )
The tank is going to store boxes of fruits , and the process is part of a post harvest routine.
I would like...
Yeah, we trying to create a cheap solution, I'm wondering what doubles the power in a different system? Is it bigger pipeline that can deal with higher flow rate of gas?
In a commercial operation you will open and close the door quite often therefore u need more power to bring the oven back to the baking temperature. Buying a new oven will exceed the budget
We going to add extra insulation and also , install inside the oven stones the can absorb the heat and keep it like this one:
https://www.youtube.com/watch?v=4lBE_uFD-jU
Yet the power of heating is a still weak , we trying to increase it somehow .
I was following the post throughout the week, not need to log in for that. Yeah I'm trying to help a friend with his oven, from the beginning i was aware of the risk. Thought maybe can improvise a cheap solution instead of replacing the whole oven, i can go deep into the document that was sent...
Hii everyone , i would like to increase the gas flow into a burner in a pizza stove and increase the power which in now about 15,000 btu, would like to increase to a maximum of 30,000 btu. My idea is to adjust the orifice and then increase the air flow ,but don't really have a clue. would like...
Thank you very much guys, yeah as i suspected its not really possible to create a velocity inside the tank of 1[m/s] and above with this kind of air flow. I guess air circulation back to the vessel would be the best.
Previously i calculated that if we put the fruits in an atmosphere of 10c...
Hii everyone
So i want to test my cooling system using it as a forced air cooling , but i am not sure if its possible.
The system consists of a vessel that mixes co2 with air and discharge it with minimum temperature of -20c at a max flow of 300[liter/min].
Now i want to put few boxes of...
Hii everyone,
So after finishing with the calculation I mostly realized that if i put for example mango in an atmosphere of 10c for 2 hour , it's whole body will change also to 10c so then , calculation of heat transfer would be simple Q=mCp(T2-T1).
for 1 ton of mangoes for example 60 [megajoul]...
Characteristic length of a sphere is not D/6? means V/A. Don't know why they are using r here for Bi and also for Fourier number.
Also after i found the temperature in the center , how can i find the distribution inside the fruit?, Since at the end i want calculate the total heat transfer from...
Yeah so i think this is exactly what makes the h convective so high, high velocity means high Re means High Nu means High h. Maybe in a fridge especially when the fruits are arranged in a big pile i can assume natural convection like 30[W/m2*s] . the air goes out from the fan at 2[m/s] maybe but...
At the moment its a bunch of fruit randomly filling a box with only small air gaps around them as the worst case scenario. That is why i am gonna do the calculation few times assuming different spheres sizes as like the mangoes are connected. but the first calculation for one mango ...
Thank you very much , i guess this is exactly my case , it just my h of convection is somehow 300[w/m^2*s] and then my 1/biot is going to zero which is ok, but it doesn't fit the x axis (
there is not much gap there when the biot is very big
I calculated the h(convection) with the long formula...
Hi pierreick,
I tried to work with the link you added , assuming a sphere with diameter of 0.08m for one mango , something is wrong when i am trying to use the charts i will add may calculation maybe you see something wrong thank you
