The Transformer Strong Oil-Water Cooling Unit is a novel heat exchange equipment with wide applications, featuring high heat transfer efficiency, low resistance loss, stable and reliable operation, compact structure, and affordable price. China began researching and manufacturing it in the late 1960s and established corresponding technical standards. We have accumulated considerable experience in manufacturing and usage. It is now widely used in petrochemical refrigeration, organic chemical food, dye-making, pharmaceuticals, machinery, metallurgy, and other industrial sectors. It has been used as a transformer cooler for nearly two decades, with excellent performance. The Spiral Strong Oil-Water Cooling Unit is formed by rolling two uniform spiral channels from sheets of 2-3mm thickness. At the ends of the two spiral channels, as well as on the upper and lower sides and tangential direction of the spiral body, pipes and flanges are welded. Inside each channel, a loaded liquid (oil and water) circulates in a full countercurrent state for heat exchange. The cooling area is the sum of the extended length of the two steel plates multiplied by the width of the steel plates. To enhance the stiffness of the steel plates and increase the critical pressure of the spiral body, spacers of a certain density are welded on the same phase surface of the two steel plates, which also increases the fluid's turbulence, raises the Reynolds number, and improves the heat transfer efficiency.
Due to the uniform curvature of the helical channel, there is no significant fluid redirection, resulting in lower resistance and no dead corners. To enhance heat exchange efficiency, the fluid velocity is typically increased within the channel, which can prevent clogging by channel debris. Additionally, the channel itself has an auto-cleaning function. Moreover, both helical channels are equipped with exhaust (liquid) holes for ease of operation and can also be used for sampling and testing.
II. Features:
High thermal efficiency
The overall heat transfer coefficient can reach 3300 Kcal/m².h°C, with superior heat transfer efficiency to the YF (air-cooled) spiral plate cooler. Its heat transfer coefficient is 1-3 times that of traditional tube bundles, thereby saving energy and offering good economic benefits.
2. Low heat loss
This oil cooler features a compact structure with minimal footprint and exposed surface area. No insulation is required if the ambient fluid flows from the outer edge to the center of the oil cooler.
3. Reliable structure
Oil and water channels are rolled as a whole plate, sealed with welding, ensuring that oil and water do not mix during heat exchange, thereby allowing the transformer to operate safely.
4. Self-cleaning feature
This oil cooler can appropriately increase the liquid flow rate without significantly increasing the pressure drop, thereby enhancing the heat transfer efficiency. The liquid flows in a spiral pattern, featuring an automatic cleaning function, which reduces the accumulation of dirt, thereby minimizing downtime for maintenance and saving on repair costs.
Section 3: Technical Specifications:
1. Nominal pressure is specified as 0.6 MPa (Note: This refers to the working pressure the single channel can withstand; our test pressure is 1.25 times the design pressure).
2. Operating Temperature Range: The carbon steel heat exchanger allows a temperature range of 1℃ to +200℃, while the stainless steel heat exchanger permits a temperature range of 1℃ to +300℃. The carbon steel heat exchanger's temperature and pressure increase range should be in accordance with relevant operational regulations.
3. When selecting equipment, appropriate process calculations should be performed to determine the suitable operating state of the fluid, ensuring that the fluid within the oil cooler channels achieves turbulent flow (typically, liquid velocity ≥ 1m/sec, gas velocity ≤ 10m/sec).
4. Users can choose different materials based on varying working conditions.
5. When using a single cooler, it is generally operated with dual oil pumps, one in use and the other as a backup. If a single unit fails to meet the operational requirements, multiple units can be used in conjunction, but the combination must adhere to the following specifications:
Parallel combination: Limited to heat exchangers of the same specification.
② Series Assembly: The plate width and channel spacing of the heat exchanger should be the same.
③ Mixed Combination: One channel in parallel, another in series, limited to heat exchangers of the same specification.
6. Installation Types: Horizontal and Vertical. Vertical installation is used to ensure that the unloading material is completely drained after parking.
7. The location of the oil cooler inlet is as per the product's factory drawings. Select the pipe nominal diameter according to Table 1. If the customer has special requirements, they may negotiate with our technical department. After the customer selects the specifications, they can send a letter to request a reference drawing for the outer dimensions.
