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Thread: Central Refrigeration Systems
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14-09-2007, 07:47 PM #1
Central Refrigeration Systems
The application that I need is to use the secondery refrigerant to flow from the main receiver to the commercial refrigerators at -20 C. then returns back to the receiver to be recooled again, and so on.
what is the suitable secondary refrigerant or refrigerants????
Thanks alot for your hounored forum....
Eng. Nedal Iben Ali
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14-09-2007, 08:32 PM #2
Re: Central Refrigeration Systems
A glycol mixture if there isn't any food there.
If there is food then industrial (~60% proof) alcohol.
(Just make sure that the engineers mix it with water before they drink whatever didn't go in to the system, at 60% proof it will burn your tongue or at least it will feel that way)
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14-09-2007, 09:18 PM #3
Re: Central Refrigeration Systems
It's impossible to make anything foolproof because fools are so ingenious...
Don't ever underestimate the power of stupid people when they are in large groups.
Please, don't teach me how to be stupid....
No job is as important as to jeopardize the safety of you or those that you work with.
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16-09-2007, 02:26 PM #4
Re: Central Refrigeration Systems
MY SYSTEM WILL WORK BY THE FOLLOWING PROCEDURE:
1- THERE IS TWO MAIN PARTS OF THE CENTRAL
REFRIGERATION SYSTEM THAT I WORK ON. THE
FIRST ONE IS THE MAIN REFRIGERATING SYSTEM,
WHICH INCLUDES COMPRESSOR AND SHELL TUBE
EVAPORATOR AND REST COMPONENTS. SECOND
PART IS CONSISTED OF RECIVER TANK AND
SECONDARY REFRIGERANT PIPING TO THE
REFRIGERATED ENVELOPES.
2- THE PRINCIBLE OF WORKING IS TO COOL THE
SECONDERY MEDIUM TO LOW TEMPERATURES (-
22 c) , THEN CIRCULATE IT WITHEN A CIRCUIT
FROM THE RECEIVER TO THE REFRIGERATED
ENVELOPES AND BACK TO THE RECIEVER.
3- WHEN THE SECONDARY REFRIGERANT
TEMPERATURE DROPS BELOW -14 C. THE
COMPRESSOR WILL START WORKING AND THE
COOLING MEDIUM (SECONDERY REFRIGERANT)
STARTS TO FLOW FROM THE RECIEVER TANK TO
THE EVAPORATOR (SHELL AND TUBE) AND BACK
UNTIL REACHING -22 C.
WHAT IS THE MOST SUITABLE COOLING MIDIUM OR SECONDARY REFRIGERANT THAT COULD BE USED FOR THIS WORKING CONDITIONS ((doesn't freeze or chimically active))
Eng. Nedal Iben Ali
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22-09-2007, 05:17 PM #5
Re: Central Refrigeration Systems
Hi, Eng. Nedal Iben Ali
Nice explanation,.... (see this, please: http://www.hoax-slayer.com/do-not-use-all-capitals.html),
but you said nothing about your plant i.e. primary refrigerant and utility for secondary one..
Anyhow you can use...
water solution of calcium chloride (CaCl2) or sodium chloride (NaCl)...
water solution of glycols - ethylene or propylene....don't forget inhibitors
halocarbon like methylene chloride, trichloroethylene or
non halocarbons like d-limonene, polydimethylsiloxane...
each one is good, further more very good...
....BUT...
you must find all properties about each one of secondary refrigerant and choose the best one for your system.
It is not an easy answer and you have to spend some time on research, we cannot design you system just give some help
If you took some time and make searching on this forum for sure you should find a lot about secondary refrigerants...
Best regards, Josip
It's impossible to make anything foolproof because fools are so ingenious...
Don't ever underestimate the power of stupid people when they are in large groups.
Please, don't teach me how to be stupid....
No job is as important as to jeopardize the safety of you or those that you work with.
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