Hi, mustafalam


Quote Originally Posted by mustafaalam View Post
Hey Iyer,
I was wondering if you could help me with setting up a cold storage unit in Pakistan for 25000bags? Each bag is 120 kg.
Pakistan has serious energy issues, so I will also need some sort of a generator hooked up to the storage unit. What I am wondering, and this may be a stupid question, but is it possible to use solar power in such an occasion? Southern Pakistan is an extremely hot country. Do let me know what your thoughts are.

My consultant insisted on using *****.
Also, what is a refrigerant? Isn't ***** or ammonia the refrigerant? What is the function of the ammonia/***** and say something that keeps on popping up on this site (r-22) is r-22, ammonia and ***** substitutes for each other? or they serve different functions? Sorry for all the stupidy. I am 27 years old and doing research in this field as I am bent upon setting up a cold storage unit for potatoes.
Welcome to RE forums...

You are building a new potato cold store for 3000 tons .... not small and simple project and design ... can you provide some more technical info about design to be able to give you some more advices ... of course if you (your consultant) like it ...

I'll suggest you indirect cooling (ammonia-glycol chiller) with ammonia as a primary refrigerant and ethylene glycol as a secondary refrigerant.

see this...

http://www.sabroe.com/products/stand...ers-recip.html

http://www.sabroe.com/products/stand...ers-screw.html

http://www.sabroe.com/fileadmin/file...009.09_scr.pdf

http://www.sabroe.com/fileadmin/file...008.10_scr.pdf

amount of ammonia within above chillers is very small ....

With all my respect to your consultant, but seems he is without any experience with ammonia .... there is no any reason to use ***** R-22 or any other for primary refrigerant

Sun energy you can use to reheat your potato before delivery to the market .... also to have a warm/hot water all around your facility almost for free ...

Maybe you can use winter cold air (I believe sometimes you have very low temperature about or even below 0*C) for cooling your potato directly ....

Dear mustafaalam, you have many possibilities to build a good cold store, but you can miss the target too ....

Best regards, Josip