Haining Solar Collector Co., Ltd.

Hot Group Ltd, located in Haining city,Zhejiang ,China, excels in designing, developing and manufacturing all types of vacuum tube solar thermal collectors and solar water heaters. We have high tech equipment and professional experts to supply high quality solar projects consultation services. Taking advantage of Haining's position of China's solar center, we enjoy great competitiveness regarding material supply chain, production techniques, and policy supports. Over the years, we have established mature operation mechanism and highlightened our leadership in solar thermal section of renewable energy industry.
     As manufacturers of solar renewable energy, we understand the social responsibility that we have. Since establishment of our company, we firmly follow the work ethics which include: motivated by high tech development, regulated by scientific management, taking customer's need as priority, and supply services beyond customer's expectations. Our mission is to grow into an international entity in solar energy division based on our 10 years experiences in foreign trade business.
     The products line includes: EVACUATED TUBES, TANKS, SPLIT PRESSURIZED SOLAR WATER HEATERS, COMPACT PRESSURIZED SOLAR WATER HEATERS, PREHEATED PRESSURIZED SOLAR WATER HEATERS, COMPACT NON PRESSURIZED SOLAR WATER HEATERS, SWIMMING POOL HEATING SOLAR COLLECTORS AND OTHER COMMERCIAL USE THERMAL HEATING facility. Along with the growing application, our products have created great values to our customers and to the global environment.

SCM
This is a split pressurized thermal collector, adopting vacuum tube heat pipe technology, is widely used for residential water heating, it’s easy to install the tubes.
Daily output of each tube is more than 2.6 gal per day. In some southern states, this number can be expanded.
Service life of this collector can be 20 years plus.
More technology data of this product please feel free to find on the Products section or you can download our catalog and get more details. 

SFCT
A solar water heating system includes three parts, it is collector, water tank and pump station.
This system can do more than just producing hot water, in winter, it can also be used in a space heating system. Homeowners in NY, NJ, MI and all northern states like this system so much, in fact, this is the most popular and reliable system.
Thanks to the intelligent controller and circulation pump, the system runs automatically, it is so easy to use, you will find it’s a good assistant. 

SCM-L
In US and Canada, some farms need a large quantity of hot water, the same things go to hotels, spa centers, etc, also it is a great pleasure and entertainment to enjoy the pool with family and friends. However, producing so much hot water with gas or electricity usually cost too much, that’s why we recommend all projects and homeowners our most effective and reliable SCM-L water heating collector.
To sum up, not only will this collector offer you more enjoyment and longer swimming season, but also will help you save dollars in coming day.

Heat pipe is not something new, only its concept, we are using it everyday. For instance, a laptop computers using small heat pipe to conduct heat away from the CPU, and air-conditioning system commonly use heat pipe for heat conduction. All these are like a heat transfer.
Here is a brief introduction of heat pipe’s operation.

Structure and Principle
The heat pipe is hollow with the space inside evacuated, much the same as the solar tube. In this case insulation is not the goal, but rather to alter the state of the liquid inside. Inside the heat pipe is a small quantity of purified water and some special additives. At sea level water boils at 100oC (212oF), but if you climb to the top of a mountain the boiling temperature will be less that 100oC (212oF). This is due to the difference in air pressure.Based on this principle of water boiling at a lower temperature with decreased air pressure, by evacuating the heat pipe, we can achieve the same result. The heat pipes used in AP solar collectors have a boiling point of only 30oC (86oF). So when the heat pipe is heated above 30oC (86oF) the water vaporizes. This va pour rapidly rises to the top of the heat pipe transferring heat. As the heat is lost at the condenser (top), the va pour condenses to form a liquid (water) and returns to the bottom of the heat pipe to once again repeat the process.At room temperature the water forms a small ball, much like mercury does when poured out on a flat surface at room temperature. When the heat pipe is shaken, the ball of water can be heard rattling inside. Although it is just water, it sounds like a piece of metal rattling inside.This explanation makes heat pipes sound very simple. A hollow copper pipe with a little bit of water inside, and the air sucked out! Correct, but in order to achieve this result more than 20 manufacturing procedures are required and with strict quality control.
Quality Control
Material quality and cleaning is extremely important to the creation of a good quality heat pipe. If there are any impurities inside the heat pipe it will affect the performance. The purity of the copper itself must also be very high, containing only trace amounts of oxygen and other elements. If the copper contains too much oxygen or other elements, they will leach out into the vacuum forming a pocket of air in the top of the heat pipe. This has the effect of moving the heat pipe's hottest point (of the heat condenser end) downward away from the condenser. This is obviously detrimental to performance, hence the need to use only very high purity copper.Often heat pipes use a wick or capillary system to aid the flow of the liquid, but for the heat pipes used in Solar Collector Inc solar collectors no such system is required as the interior surface of the copper is extremely smooth, allowing efficient flow of the liquid back to the bottom. Also Solar Collector Inc heat pipes are not installed horizontally. Heat pipes can be designed to transfer heat horizontally, but the cost is much higher.

The heat pipe used in Solar Collector Inc solar collectors comprises two copper components, the shaft and the condenser. Prior to evacuation, the condenser is brazed to the shaft. Note that the condenser has a much larger diameter than the shaft, this is to provide a large surface area over which heat transfer to the header can occur. The copper used is oxygen free copper, thus ensuring excellent life span and performance.Each heat pipe is tested for heat transfer performance and exposed to 250oC (482oF) temperatures prior to being approved for use.For this reason the copper heat pipes are relatively soft. Heat pipes that are very stiff have not been exposed to such stringent quality testing, and may form an air pocket in the top over time, thus greatly reducing heat transfer performance.

 Freeze Protection
Even though the heat pipe is a vacuum and the boiling point has been reduced to only 25-30oC (86oF), the freezing point is still the same as water at sea level, 0oC (32oF). Because the heat pipe is located within the evacuated glass tube, brief overnight temperatures as low as -20oC (14oF) will not cause the heat pipe to freeze. Plain water heat pipes will be damaged by repeated freezing. The water used in Solar Collector Inc heat pipes still freezes in cold conditions, but it freezes in a controlled way that does not cause swelling of the copper pipe.