Application Of Displacement Ventilation In The Chinese Market (2)
4. The end of displacement ventilation supply air device
(1) the end of the first generation of displacement ventilation air supply device
The end of the first generation of displacement ventilation device mainly consider the fresh air in a very smooth and uniform state into the interior. Practical application is in the air distribution outlet device mounted filter, and set up one case of air inside the cone-shaped bag home, thus ensuring the uniformity of air. Air distributor has a certain degree and spacing of holes, holes on the mask layout uniformity. As the export of low wind speed of displacement ventilation, air temperature characteristics of small air displacement ventilation system led to large, its terminal unit sizes are relatively large. The first generation of displacement ventilation terminal devices are usually cylindrical, semi-circular cylindrical, 1 / 4 cylinder, flat, and flat wall type, etc. 5. Displacement ventilation in the civil floor terminal units generally are installed. When a high-level office building with ground floor mezzanine, the displacement ventilation terminal devices can be installed on the ground. As in the industrial buildings on the ground with mechanical equipment and product components of transport, displacement ventilation terminal device overhead arrangement. Floor installation is the most widely used form. 1 / 4 cylindrical can be arranged in the corner, the easy to match with the architecture. Semi-circular cylindrical and flat type for wall installation. Cylindrical volume for windy situations and can be installed in the room. Tongji University and Shanghai Taishan ventilation air-conditioning Co., Ltd. has developed a first generation of displacement ventilation terminal devices, and in some works to a certain application.
(2) second-generation air terminal device The end of the second generation of the main air supply device is without prejudice to comfort and indoor air quality than mixing ventilation systems to improve the system based on the cooling capacity. Indoor moisture load and wind load and a small part of the new cooling load borne mainly by the displacement ventilation systems, indoor most of the cooling load by the radiation cooling ceiling borne by the cold. This greatly reduces the number of terminal device settings. And the ceiling on the reduction of cold vertical temperature gradient has a significant effect. Combination of displacement ventilation and cooling ceiling exact design, construction and management can create a sense of neither hair, clean and comfortable indoor air environment and significant energy savings. So many people call it “healthy air”, “future air-conditioning” I believe in the future development of HVAC, will be the place of.
(3) The third generation of air terminal devices
The end of the third generation of air supply device is the use of the principle of induction, in the end device with a special air-injector, a large number of indoor air with an air mixture to increase the cooling capacity of air. Injector can be installed in supply air terminal device can also supply air duct. Indoor air and a lot of air mixing may bring down the efficiency of ventilation, but as long as the air mixture limited to personnel activity area, the ventilation efficiency, ventilation index and mixed ventilation than traditional high. Third-generation air supply device is in development, the development application stage.
5. Displacement ventilation in the practical application of engineering
(1) Shanghai Songjiang Tiger Park company’s plastic bag plant
Factory main production plant by the extrusion blow molding, printing complex, cutting bag making and packaging of four parts. Plant main span width 25.6m, height 7.80m (extrusion blow molding section in a width of 18m), except Section of packaging some of the other three are used outside the replacement of air-conditioning ventilation air. In order not to affect the effective use of workshop area, displacement ventilation device located in both sides of the wall to approximately 2.20m from the Department, and the air conditioning on a platform in the workshop, the air conditioning air conditioning air return directly back to back to the outlet ( do not pick up the wind), the blow molding section in the top of the other with Exhaust Fan. The heat and polluted air efflux. As for the foreign concept of the project design, process equipment ominous the situation, but cutting Bag Section of the cooling load indicator is only 86W / m 2 Unit air volume index of 20 ~ 25m 3 / M 2 . H, from these indicators than the hybrid air-conditioning ventilation index lower by about 30% to 40%.
(2) plant in Nanjing Ericsson Communications Co., Ltd. Jiangning
Nanjing Ericsson Communications Co., Ltd. is a Swedish company Ericsson, a joint venture with Nanjing Panda Electronics Group established. Plant in accordance with the standards of Sweden, the main plant of the air conditioning and ventilation system uses a displacement ventilation system. The factory covers an area of 50 acres, including a # building (office area), 2 # 3 # Building and construction (production plant) between the construction area are 2069m ^ 2 (air-conditioned area of 778m ^ 2), ceiling height of 3.4m. 2 # 3 # Building and construction of production plant using the exchange floor ventilation air supply outlet. System along both sides of the sidewall air supply pipe layout, riser through the air supply outlet connected to each end, arranged in the ceiling return air duct, the axis in the room, exhaust fan through the roof to the outside row. Within each shop floor layout of a half cylinder outlet 29, return air (1000 × 300) 15 , air vents ( 320) 18 . Each outlet of the air volume of 1931m 3 / H, cooling load index of 233w / m 2 , Heat load index for the 90w / m 2 . The system in use in nearly three years, the owners have felt this system provides good air quality and ventilation of high efficiency, energy efficiency is also achieved satisfactory results.
(3) Other works Light Industry Design and Research Institute in Shanghai, designed by several large paper mills (such as the Asia-Pacific Paper Company Changshu, gold leaves mills) paper plant are used in makeup air displacement ventilation the end of the device, some combination of civil side wall of settings, some settings a certain height in the workshop to workshop the production from time to occupy the area.
Heat source for some tall plants, because the workshop span, uses a natural way of exhaust air roof, often poor ventilation, displacement ventilation, if adopted, would improve the ventilation in the workshop.
Recently completed the Shanghai Grand Theatre auditorium seats, the air supply system of displacement ventilation systems in public buildings in a typical application. To demonstrate the feasibility of the system had air show in the laboratory of Tongji University has established the system under the 1:1 single-seat air supply system, solid-type model, and conducted a series of tests. Actually put into use after the situation is satisfactory.
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