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Three years ago, we designed and installed a solar thermal water supply project with a daily output of 30 tons of hot water at a major hospital in Beijing. Many users from the return visit, the use of very good, 365 days a year, more than 30 tons of hot water per day, the water temperature not lower than the set 45 ℃. Since urban areas in Beijing have long ago banned the burning of coal-fired boilers, the cost of fuel has increased severalfold after the conversion of many units to gas-fired boilers, resulting in increased operating costs for the enterprises. From the perspective of environmental protection, the policy of changing coal to gas is beneficial to the society and the benefit of the people. From the operating cost of gas-fired boilers, the cost of enterprises indeed increases a lot. Therefore, from the solar collector water supply and heating engineering unique environmental and economic point of view, is indeed a lot of work, from our design and installation of the project, enough to see the environmental effects of their social effects and economy as a business Generate huge economic benefits. This solar hot water project in the early design, we carefully re-mapping according to the design drawings of buildings (many buildings during construction, many times to modify the construction drawings, the actual size and drawings often have gaps), the modified part will be changed Re-mark, easy to design the accuracy of the size of each part, in order to facilitate the final assembly work. In the middle of the building facing the best location, there is a large elevator room, so that the morning sun some east, the western part of the impact of sunshine; the afternoon sun some west, the eastern part of the impact of sunshine. When the building area is very limited, only to consider the maximum use of its construction area, according to the traditional method of installation of solar water heating, according to the latitude calculation of manifold angle, but also between the header to keep A certain space, to prevent the shading of the problem of occlusion, combined with the shape of the building is a complex multilateral geometry, very irregular, with a certain degree of design and construction difficulty. After the calculation of the hospital construction area of ​​about 570 square meters, minus the elevator room and the shadow of the room and behind more than 20 air-conditioning units, the actual usable area has less than 500 square meters. At that time, the national standard "solar hot water system design, installation and engineering acceptance of technical specifications" GB / T18713-2002 Although it has just been made but has not yet been announced. We refer to the relevant information from other countries and see that many countries have already adopted horizontal or small-angle installation methods. Looking at it in translation, we think that there is a certain truth. Such as: 1, from the fluid mechanics analysis, the water flow more smooth, so the loss along the way is relatively small. 2, the collector system up and down transition path is very small, so difficult to have a vacuum tube deposits. 3. In the northern summer months, the morning sun rises from the northeast corner, and from the northwest corner in the evening is a conventionally installed inclined solar collector that hovers behind or on the collector for a few hours . Sunlight can be understood as parallel light, the vacuum tube is circular, most of the seasonal level is also placed 180o exposure, a day of sunshine longer, so can increase the absorption of the sun's heat (southern China has little effect, should pay attention to the north The local winter solstice season vacuum tube sunlight blocking angle of winter sunshine radiation is weak, and the summer difference between the more the more the more obvious north).