NRLS for Chillers & HVAC Energy Conservation
Heat exchange tube oil film Oil film layer hinders heat transfer
After a long period of operation of the refrigeration unit, biological sludge and scale will be generated on the cooling water side of the condenser, and the refrigerant side will produce a refrigerant oil film and possible oil fouling caused by oil degradation. These will reduce the heat transfer efficiency, leading to a decrease in refrigeration efficiency and an increase in energy consumption.
The cooling water side of the condenser will undergo regular chemical cleaning to reduce energy consumption and improve refrigeration efficiency. Due to the closed system on the refrigerant side, direct cleaning and cleaning cannot be carried out. The oil film caused by lubricating oil will accumulate on the surface of the evaporator condenser tubes, causing an increase in energy consumption and a decrease in refrigeration efficiency.
In the 1970s and 2010s, ASHRAE (American Society of Heating, Refrigeration, and Air Conditioning Engineers) conducted research on the effect of refrigerant oil on heat transfer in RP-601 and RP-751 evaporators, respectively. In the study, it was found that the lubricating oil in the evaporator and condenser can affect the heat transfer effect, thereby reducing the COP refrigeration efficiency. Able to lose 15-20% of refrigeration efficiency loss.
In response to this situation, in the 1990s, the United States invented PROA products specifically designed for energy-saving work in cleaning oil film on the refrigerant side. After 30 years of development, this product has evolved to use nano small molecule fully synthesized refrigerant additives (lubricant additives) for refrigerant side cleaning and energy-saving work.
Product Technology Introduction
NRLS is a brand new extreme pressure synthesis PAO/POE high-tech product, with a molecular diameter of 0.1 microns (lubricant molecular diameter 3-4 microns). NRLS does not contain solid additives such as PTFE, molybdenum disulfide, graphite, copper, lead, silver, and other extreme pressure components, nor does it contain carbon tetrachloride, trichloroethane, naphthalene, or chlorinated paraffin, nor does it contain halogen components (chlorine, fluorine, bromine, iodine, astatine). It can be applied to various refrigerant types of refrigeration systems and various types of refrigeration compressor systems. During implementation, the NRLS is injected into the evaporator using a manual pressure pump. Through the flow of refrigerant and the physical and chemical adsorption of lubrication oil, the NRLS molecules gather on the metal surface, filling the pores and roughness of the metal surface, and forming a nano monomer molecular layer. This coating replaces the oil film, possible oil stains, and impurities that adhere to the metal surface. After the formation of this molecular layer, the refrigerant oil no longer adheres to the metal surface, which increases the thermal conductivity coefficient K in the evaporator and reduces the loss of the refrigerant's walking boundary, increasing the refrigerant's operating speed; NRLS itself is an extreme pressure product, which greatly increases the lubrication and antioxidant capacity of the unit. Improving lubrication capacity also improves the reliability and service life of the equipment. After NRLS forms a tight molecular layer on the metal surface, it will not lose its effectiveness due to replacing refrigerant lubrication oil.
The function of refrigerant additives is like water droplets on lotus leaves. There is a layer of coating on the lotus leaves, and the water droplets do not scatter on the lotus leaves. Our goal of refrigeration energy conservation is also to prevent lubricating oil from adhering to the surface of the tubes. As the refrigerant flows, the heat transfer efficiency no longer decreases, and the cooling efficiency COP can also be maintained continuously.
NRLS filling metal coating Metaphor of the Role of NRLS
Energy saving acceptance verification instructions
According to the refrigeration principle, COP (nominal operating condition performance coefficient) is not a fixed value and changes with changes in operating conditions. The higher the COP, the more economical and energy-saving the refrigeration unit is.
Therefore, the energy-saving of refrigeration systems, especially refrigeration hosts, is verified by increasing the COP value (which must be implemented under the same working condition before and after implementation).
Industrial refrigeration units, especially in the chemical industry, are mainly low-temperature units with a large amount of lubricating oil filling. For example, ammonia refrigeration units have very low COP values, making it even more necessary for these units to carry out energy-saving refrigerant additives.
We provide professional NRLS adding, COP measurement and verification services. We have been providing this technical service for over a decade.
