Designing a cooling/freezing tunnel for white fish

[Lodiev]

To all the realy clever people out there, can u please give me some clues on designing a cooling tunnel for white fish?We have a torry tunnel that works verry good, the only problem is the price to import the stuf. i think we can build it our selfs.:)

900 kg p/hr from 16'c to 0'c
structual design tips?
What belt to use?
Airflow patern?
Coil design?

[nike123]

Why don't use salt water for cooling of fish. Why must be used cooling tunell?

[michaelm]

B”H

Is fish packed in a plastic bag? How many hours a day do you need to operate the freezing process?

[Lodiev]

Why don't use salt water for cooling of fish. Why must be used cooling tunell?

What a stupid suggestion.:eek:
Have u ever heard about EU standards?
HASSP?

Did not think so.

[Lodiev]

B”H

Is fish packed in a plastic bag? How many hours a day do you need to operate the freezing process?



:)The fish is open in fillet form and weighs about 250g to 350g individually. 2 x 8Hr shifts with 3 hr's between shift starts again.

[nike123]

What a stupid suggestion.:eek:
Have u ever heard about EU standards?
HASSP?

Did not think so.
Where in your original post you mentioned that is for processed fish?
Do you think that we need to read minds?

[nh3wizard]

What a stupid suggestion.:eek:
Have u ever heard about EU standards?
HASSP?

Did not think so.

You better check that nasty attitude you have!!!!!!!!!!!:mad:

[abet_meneses]

Mods,

please take action on that arrogant reply.

[Peter_1]

What a stupid suggestion.:eek:
Have u ever heard about EU standards?
HASSP?

Did not think so.

What's HASSP?
HASSP has nothing to do with EU standards. You're living in SA? How then we can know you wants to follow EU standards.
HASSP :o:o:o:o:o

Oooooohhhhh,, you meant HACCP? YOU made a stupid remark.

Watch your tone, because I don't think you will receive a lot of valuable help after your post.
I suggest you use the search function.

[Peter_1]

If you're a foreman - what's in a name - then you should know the answers to your questions.

900 kg p/hr from 16'c to 0'c
900 x 16 x 1.16 W (these are basics)

structual design tips? Strong enough

What belt to use? Stainless steel

Airflow patern? As much as possible

Coil design? with steel tubes

You want to use an NH3 tunnel to cool 900 kg fish/hour :confused:

[Magoo]

If you want to do something on the cheap to get established, consider a cryogenic tunnel, your local industrial gases people will lease system so long as you use their liquified gases.
Once you are under way then look at mechanical refrigeration systems.
magoo

[SUBCOOLING]

try birdseye

[Peter_1]

If you want to do something on the cheap to get established, consider a cryogenic tunnel, your local industrial gases people will lease system so long as you use their liquified gases.
Once you are under way then look at mechanical refrigeration systems.
magoo

On the short term, a cryogenic tunnel is cheap (purchase) but extremely expensive when used fro cooling.
The higher price of a mechanical tunnel is payed back - compared to the cryogenic one - in less than 2 to 3 years.
Cooling products with liquid nitrogen is extremely (!!) expensive (+/- 10 fold of electricity used by a mechanic one)

[Magoo]

Hi Peter_1
I agree totally that cryo is exspensive to run. But they are popular with smaller operators introducing new product lines of smaller quantities. After establishing the market then they spend the big money on mechanical plant and get recovery.
To install a system as described at 900 kg /hr x 2 shifts per day they would be outlaying $1million minimum or there abouts, for mechanical refrigeration.
magoo

[Lodiev]

Sorry for the remark i made Nike123.
I want to build it myself and woeld apreciate some help on the calculations of the cooling needed for the job, and basic layout of chutch a tunnel.
We have a excisting plant that runs at -40'c suction and have 800kwr capacity.
We also have 3 x Gyro Freezersin the facility at present.
Structural i know what to do.
Beltwise do i go for a solid stainless or a wire belt.
Airflow vertical over the product or horisontal on the product.

Sorry again!!!!

[gwapa]

Lodiev
What are the Physical characteristic of the White Fish? weight,lenhgt etc
What are the conditions you recive those in your plant? temperature
What is the final temperature you are spectting to get?
How many pallets doyou receive per day?
Are you plannig to put those on a tray or lay those on a belt?
Regards
Gwapa

[Lodiev]

characteristic's: Fillet form, oil with spices on exterior.
Weight per fillet: average of 98 grams
lenght: 80mm to 100mm
wide: 40mm to 600 mm
We catch white fish and process it in the factory to whatever the customer prefers.
the core temp of the fillets is between +10'c and 15'c after procesing is done.
we woeld like it to be at -28'c before packing.
It is a continuos production line and i woeld like to put it on a belt in and out to reduce labour. the production of fillets is round about 400 Kg per hour and we like to refrigerate it at that rate.

Hope this ansers all your questions.
Thanks

[Peter_1]

If you search once trough my posts, you will see some pictures of a tunnel.
I have a client using a freezing tunnel for fish fillets. http://www.gadus.be/products.htm

[gwapa]

Lodiev
As you have pointed out you have a continus process of small piece of fish in fillet form.

For this kind procces I would selet a spiral freezer with stailess steel belt and walls.Maybe a plastic or nylon for low temprature could be used

If you have ammoniac or other refrigerant at -35ºC you could buy a spiral tunel and connect to your system.
http://www.jbtfoodtech.com/Solutions/Processes/Freezing-and-Chilling.aspx

Also you could rent a cryogenic tunnel (Nitrogen or CO2)for a while and then jump to your own.

I would not go with a blast freezer
Regards
Gwapa

[Lodiev]

Thank u Peter/Gwapa
So what ur saying is that a tunnel will not work becaurse of the prossesing speed?

Gwapa do u also sel second hand Spiral/Gyro freezers?

[Magoo]

A tunnel freezer would be fine so long as the belt is wide, probably 2 meters, so as retention times are acheived. To chill fish fillets you will need to operate sub-zero air temps., to get core temps correct.
A Frigoscadia spiral would be small and expensive, but would run 24/ 7 if required with ADF.
The slower you chill the greater the weight loss, so you could consider glazing to maintain product weight.
magoo

[gwapa]

Lodiev
No I don't sell
regards
Gwapa

[Lodiev]

[quote=Magoo;161162]A tunnel freezer would be fine so long as the belt is wide, probably 2 meters, so as retention times are acheived. To chill fish fillets you will need to operate sub-zero air temps., to get core temps correct.

How long woeld it be for the aplication if its 2 meters wide?
We run at -40'c

[Peter_1]

Your first spoke about a cooling and not a freezing tunnel, a huge difference for me.