In December 2004, the Kunming Science and Technology Bureau of China approved the Kunming Nankai Energy Research Institute to carry out the development and research of the key industrial science and technology project “Building Integrated Household Intelligent Control Dual Cycle Solar Water Heater System”. After the first-generation flat-box system integrated solar collector-water heater with independent intellectual property rights was successfully developed and authorized by the State Intellectual Property Office for the invention patent, Kunming Science and Technology Bureau organized and presided over the project acceptance and product appraisal of the project. , the achievement registration. The expert opinion of the acceptance and appraisal meeting believes that the building-integrated household intelligent-controlled dual-cycle solar water heater system has removed the high-level circulating water tank, and now has a good combination of water heaters and buildings, creating an effective way for the integration of solar energy and buildings. The successful development of the flat box system integrated solar water heater verifies the correctness and feasibility of the natural circulation system integration theory proposed by Kunming Nankai. On this basis, in 2006, Kunming Nankai Energy Research Institute successfully developed a new generation of “tube-sheet natural circulation system integrated solar collector-water heater”. This new system can combine the whole circular horizontal water tank with the thermosiphon circulation mechanism of the flat plate compact natural circulation system, and integrate the whole system function into the scope of a tube plate collector after simplification, thus realizing a flat plate, that is, A complete set of tube plate type natural circulation constant temperature supplementary solar collector hot water system. (Hereinafter referred to as “collection-water heater”) The collection-water heater can also be directly anchored and installed on the tiled sloping roof of civil structure according to the requirements of building integration; on the facade. The collector-water heater system installed on the flat roof can not only adjust the installation angle facing the sun and the azimuth angle within the range of 180° between 10° and 50° according to the sunlight conditions. In addition, the thermal insulation hot water storage tank placed on the tripod directly below the water heater can dissipate the remaining water overnight, and when there is sunshine the next day, it can also automatically conduct passive secondary circulation heating to save water resources. And ensure the quality of the product water temperature. The new system also realizes active or passive water temperature control; the system water temperature can be adjusted between 45℃-55℃ on demand. When the sun shines for one hour, there will be one hour of constant temperature hot water, and the thermal efficiency of the system is much higher than the current national standard. The new system also has the function of automatic passive and delayed emptying of the cold and hot water pipes, which realizes the “valve open and hot water”: avoiding the waste of a large number of pipes for heat dissipation and waste water; Solar energy can save 4~6t of water every year. Because the hot water storage tank of the new system only contains hot water, there is no mixing of cold and hot water; the net hot water available for each system is 1~1.5 times more than that of the traditional system of the circular horizontal water tank and the flat plate type. The new system is equipped with a solar photovoltaic electronic logic intelligent controller that works synchronously with the water heater, which can automatically control the solar heating temperature according to the temperature standard set by the user; display the water temperature and water level information of the water tank; and automatically start and close the system power according to the current situation of sunshine. , to ensure the safe, efficient and stable operation of the system. The water and electricity of the system operate separately, direct current, low pressure, self-control, no water leakage, no scaling: sewage, anti-freezing, anti-vibration, anti-slip, no harm to people and nature, no pollution to the environment. It truly realizes the separation of collection and storage, and the water tank is completely invisible; fixed temperature double circulation, anti-scaling and anti-cold; tile surface is obliquely inlaid, and the plane angle is variable; the residual water is reheated, and the valve is opened to run hot water.
The new product was approved by the Product Quality Supervision and Inspection Center of Yunnan Province from November 20 to 27, 2006, in Kunming, for a group of building-integrated household intelligent control, fixed-supplement and double-cycle solar water heaters with an effective heat collection area of 1.85m². The prototype was mass-produced, and after several consecutive computer practical tests, the inspection report issued by the inspection center stated that the flat-panel solar water heater produced a total of 201.4kg of water (the average temperature of the output water was 54.9°C) within the 8h test period, and the system heat gain was 33.6M , the system’s daily operating thermal efficiency is 81%.
In October 2007, the project achievement was jointly recommended by the Yunnan Provincial Department of Science and Technology and the Yunnan Provincial Council for the Promotion of International Trade, and participated in the “World Chinese Entrepreneurs Alliance’s First World Chinese Entrepreneurs Innovation Award” competition held in Macau. Among the more than 80 innovative product projects declared by Chinese inventors around the world, this project stood out after being reviewed by international experts and won the only solar energy application technology innovation among the first ten innovation awards of the 4th World Chinese Entrepreneurs Summit. prize.