SFVB Vaccum Tube With Heat Pipe

• SFVB vacuum tube with heat pipe uses the phase change of the working fluid (the main component is high-purity water) to quickly transfer the heat absorbed by the vacuum tube.

• Sunflower's heat pipe(copper) is made of high-purity hollow copper tubes，at one end of the tube is a heat pipe bulb with larger diameter.First seal one end of the copper tube and inject a proper amount of high purity water into the tube.The copper tube is heated at a high temperature, and the air in the copper tube is discharged and sealed, and a vacuum is formed inside the copper tube.The purpose of creating a vacuum in the heat pipe(copper) is to lower the boiling point of the water.At standard atmospheric pressure, the boiling point of water is 100 ° C,but inside the heat pipe(copper) that has been drained, the boiling point of the water will drop to 30 °C.The starting temperature of the heat pipe(copper) is greatly reduced.

SFVB consists of a heat pipe(copper), a vacuum tube, an aluminum fin and a silicone plug.

1.3 Working Principle

• High speed and high efficiency on heat transfer.

• Low start-up temperature on heat energy and better resistance against lower temperature ,obvious advantages on performance in low temperature and cold regions.

• The round structure automatically tracks the sunlight, maintains high efficiency throughout the day with stable heat supply.

• No water inside, no scale, which maintains efficient heat exchange for a long time.

• Pressurized type, independent design,the disassembly and assembly does not affect the system operation.

2.2 Specifications

• The non-condensable gas generated at the bulb(top) of heat pipe(copper), will prevent the heat transfer from occurring, thereby attenuating the heat transfer efficiency of the heat pipe(copper).
• We use high-purity red copper, together with ultrasonic&high-temperature degreasing cleaning method in the manufacturing process to avoid impurities from being mixed and decomposed to generate non-condensable gases.

• Excellent welding and sealing process to maintain long-term high vacuum.

• The performance of water is stable so water does not decompose under high temperature and high pressure, does not produce non-condensable gases.

• High-purity water can prevent the decomposition of impurities and produces non-condensable gases.

• During the heat pipe operation cycle the flow of condensed liquid (water) to the bottom relies on gravity and for this reason heat pipes of this design do not work when horizontal.

• The installation angle and efficiency of the heat pipe are shown in the figure below. The best installation angle is 30°-60°.

• Taper design at the end of the heat pipe(copper), which plays a good role on antifreeze effect on physical structure. The heat pipe will not get failed  at a -35 °C ambient temperature.
• If the temperature is lower than -35 ° C, we can use a special antifreeze design.Please explain before buying.

• 1st sunflower has passed certifications from different quality management systems and  product testing institutions. such as ISO9000, CE, Solarkeymark, SRCC, BV, SGS, Watermark etc.
• Warranty period : 5 years.
• Service life : 20 years.

• The solar vacuum tube with heat pipe is packed in carton, and the carton is equipped with anti-pressure foam. We will add plywood cases extraly for package of goods under LCL shipment.

• The package design can be stacked and stored, but the base layer should be flat and evenly stressed. The maximum stacking level of the solar vacuum tube is 17 levels.