Many of the central air conditioners in the writing buildings or malls operate silently every day, but you probably do not know — its “heart” will also age and will need to be replaced with a cold oil replacement comparable to the “heart bridge”。
This process appears to be a mere oil exchange and a high-risk technical exercise。
There is a slight imprudence, while energy efficiency is reduced at light and compressors at heavy end of life。
Why is this seemingly routine protection being seen as a critical node in the industry that determines the lifetime of the equipment
A real professional exercise begins with the “oil selection”。
Refrigerated oil is not readily available for “similar” purchases, but is accurately matched with refrigerants and compressors。
For example, a screwr usually uses oil 68, whereas a centrifuge prefers centrifuge 32, while a r22 system uses mineral oil, while a fleet of r134a or r410a must be combined with pee。
I don't know about that. It's like gas trucks with diesel, and it's not gonna work。
By 2025, energy efficiency standards have been modified to make the long-term stability of oil more demanding, and energy-efficient aircraft groups are more inclined to use low viscosity synthetic oil in order to maximize magnetic suspension technology; at the same time, the spread of new low-carbon refrigerants, such as r-32, has also made oil damp capacity a “hard indicator”。
In a word, the wrong oil, the whole machine is taking a risk。
The second step is that old oil must be discharged cleanly and thoroughly。
A number of maintenance teams have simply turned their mouths and released a portion of the oil, but that has resulted in the release of only 70 per cent, leaving impurities and acids to contaminate the new oil。
Specialized operations rely on dry nitrogen gas for repeated cleaning and the extraction of oil and scrap in the dead corner; if the equipment has ever burned the compressor, the cleaning agent must be used to recycle the liquid until it is clean。
Experienced masters may even be able to take time and again below the pressure level of 5 pa for 12 hours, a level of detail that is called “professional”。
Professional cleaning is not only for the sake of cleanliness, but also for the purpose of preventing subsequent operation of hydraulic shocks, which are lifelines for the crew。
The third step is “vacuum raise”。
The significance of this step is comparable to the final disinfection of the operation。
Refrigerated oils are particularly water-absorbed, and when water is blended, the lubricants fall and the electric power is corrupted。
Eligible operations require a vacuum pump to an absolute pressure of less than 100 pas, and no direct discharge of oil can be made when new oil is inhaled by pressure differentials。
Some high-standard projects in recent years have even required vacuum protection of more than one hour, with acid and water content being detected to ensure that the system is absolutely dry。
This high-reliability scenario of a data centre has been extended to a maximum of 24 hours, with the introduction of ultraviolet detection of microdust — in order to ensure long years of uninterrupted operation。
The fourth step is to replace the device。
All cores, dryers and seals are upgraded simultaneously。
Otherwise, once old impurities enter new oil, the problem will be repeated。
Many older aircraft are exposed to micro-spills as a result of age of sealing, with greater risk from new environmentally friendly refrigerants。
A number of plants now provide integrated oil separation components, which are easier to maintain and more equipment is closed。
Some industry standards also provide for the replacement of oil filters and dryers at least once a year, not only for maintenance, but also for safety and hygiene, by central air conditioning in medical or public places。
The last step is debugging and authentication。
Is there enough gas
Is the pressure level stable
Is the vibration smooth
These are on-site indicators of the effects of oil switching。
Under the new standards, many intelligent systems have been able to monitor oil pressure and vibration in real time and predict potential hazards。
Some service providers use energy efficiency tests to ensure that post-oil refuelling apf indicators are graded and even pue (energy efficiency ratio) tracking of the data centre fleet can bring significant energy efficiency gains — both technical and managerial。
The replacement of refrigerated oil was ostensibly a maintenance exercise, but behind it was a microcosm of the accelerated upgrading of the industry。
New refrigerants, new standards and new scenes are forcing protection into a more sophisticated era。
For enterprises, the choice of a service provider with a real knowledge of refrigeration systems and specialized equipment is to buy a long-term “health guarantee” for their own air-conditioning systems。
It not only prolongs the life of the equipment, but is also a triple guardian of energy efficiency, environmental protection and asset security。
Central air conditioning, which is a daily presence, determines the technical details of the obligation and is quietly reshaping the industry。
A standardized oil exchange is the starting point for rejuvenating equipment。
And the invisible details determine the stability and comfort of the city。
