Refrigeration limit temperature of lithium bromide units
Thread Content
Based on the lithium bromide chillers that have been used in the past, the physical properties of lithium bromide limit the lowest cooling temperature that such chillers can achieve to 4°C. However, some manufacturers claim that their lithium bromide chillers are capable of achieving a cooling temperature of -5°C. Are there any units that already use these chillers capable of reaching -5°C? What improvements have been made to enable this? Seek advice! ! !
Since the conventional refrigerant is water, which freezes below 0 degrees, what if another solvent-based medium is used as the refrigerant, one whose freezing point is below 0 degrees? I worked backwards based on principles; it’s not necessarily that this is the reason, as this also represents someone else’s livelihood and cannot be ruined casually. ;P (Personal opinion, for reference only.) ）
Yes, but it was said earlier that the limit for aqueous solutions is 4°C; this is still a significant difference from 0°C. Could it be due to the vacuum level or the addition of other ingredients?
For a lithium bromide unit to operate, circulation is necessary; in other words, it must be in liquid form and in a flowing state. 0℃ is the freezing point; you need to give the system some margin as well. Otherwise, if the display shows 3℃ while the actual temperature is 0℃, wouldn’t that cause the cycle to stop? As for where to add it and what to add? I know I can’t tell you either, right? Besides, I only deduced the reason based on the principles.
Try changing the cooling medium, such as ethylene glycol
The coolant medium can be changed. However, in lithium bromide absorption refrigeration, the cooling effect is generated when a concentrated solution of lithium bromide absorbs water; if another substance is added to the refrigeration cycle, it affects the absorption process and as a result the cooling effect decreases. For the province where the power plant is located, the limit is 5°C, while the optimal operating temperature is 7°C.
The refrigerant can be changed, but when using lithium bromide alone, the substance remains fixed; therefore, under the same conditions or operating conditions, its physical properties should remain identical.
Replace with ethylene glycol to prepare aqueous solutions of different concentrations!
Ethylene glycol does not evaporate at low temperatures, so how can it be used in refrigeration units?