Development Background
Large-space buildings have special requirements for air conditioning. Due to the high space and large floor area of ​​tall buildings, the design of air conditioning airflow organization brings many problems: when cold air needs to be delivered in summer, it is even more difficult, and often one thing is lost for another.For such large-space buildings, there are two traditional ducted air conditioning design methods. One is to arrange the air duct on the roof truss, and the airflow organization method is vertical downward delivery. The biggest problem is how to take into account both cold and hot air delivery. The main disadvantage is that the air duct of the air conditioning system is long, the air duct cross-section is large, and the air duct occupies a lot of effective space, or affects some of the building's use functions (such as installing a crane in the factory), or increases the cost of the building (increasing the building height out of necessity). At the same time, the air conditioning unit has high energy consumption, increased operating costs, and the noise of the air conditioning unit often exceeds the standard allowable value, and must be treated with noise reduction. Another way is to arrange the air ducts on the walls on both sides of the building, and the air flow organization method is horizontal air supply. In addition to the same disadvantages of high fan energy consumption and high noise as the first method, there are also problems such as the concentration of air ducts and large air duct cross-section. The air ducts often affect the lighting of the external windows. For industrial plants with overhead cranes, the arrangement of air ducts and overhead cranes often conflict. When the building width is large, the middle part is often difficult to get in place, which affects the air conditioning effect. In addition, in order to solve the problem of hot and cold air supply at the same time, traditional central air conditioners sometimes need to set up two sets of air ducts, which further increases investment and occupies effective space. In view of the special requirements of high-rise and large-space buildings for air conditioning, our company has developed the BEST remote jet air conditioning unit integrating refrigeration, heating, ventilation and heat recovery through long-term investigation and summary of the experience and lessons of developed countries in the application of air conditioning in high-rise and large spaces after years of dedicated research on the basis of the existing ductless induced ventilation technology, providing ideal air conditioning terminal equipment for high-rise and large spaces with a new concept.



Technical principle
The tailor-made solution BEST remote jet air conditioning unit realizes remote air supply through forced jet, eliminating the air supply and return air ducts of traditional central air conditioning; through the special nozzle with adjustable air supply direction, different flow states of cold and hot air supply are realized, so that cooling and heating are taken into account in the same equipment, fundamentally overcoming the defects of traditional ducted air conditioning, and it is easy to realize local sewage discharge. It is a multifunctional system and better adapts to the special requirements of large-space buildings for air conditioning. BEST remote jet air conditioning units are divided into two forms: horizontal and vertical. The horizontal unit adopts a spherical nozzle, which can adjust the air supply angle in all directions within a range of 60° (0 to 30° upward, downward, left, and right), and the adjustment method can be manual or electric. By adjusting the appropriate air supply angle, not only can the problem of cold air falling too early or hot air not being delivered be avoided, but also the contradiction between cooling and heating can be solved; and because the air supply angle has a wide adjustment range, it also makes up for the defect that the air flow organization calculation is not easy to be accurate. For details, please refer to our company's "Horizontal Unit Product Manual". The vertical unit in the BEST remote jet air conditioning unit adopts BEST special nozzles. By adjusting the angle of its blades, different flow states of the delivered hot and cold jets can be achieved to achieve the ideal airflow organization state. BEST special nozzles have two adjustment modes: electric and remote control. Energy-saving system combination mode The central air conditioning system composed of BEST remote jet air conditioning units and centralized heat sources is a split central air conditioning system - centralized heat source (water inlet/return water), decentralized (on-site) heat exchange, and its system combination mode has energy-saving advantages over ducted air conditioning. This system adopts a strong convection air supply method from top to bottom to deliver the treated air to the working area, so that almost no air stratification will be formed in the entire space, improving temperature uniformity, reducing energy loss caused by roof heat dissipation, and making the system more energy-efficient. Its decentralized heat exchange characteristics make air conditioning equipment easy to group control and operate, so that users can flexibly use air conditioning according to changes in production situations, production off-seasons, and work and rest time, which is more energy-saving than the unified operation mode of traditional central air conditioning and heating methods. Since it performs heat exchange at the site of use, its indoor units (BHV, EHV, EKV) directly circulate and process indoor air, making maximum use of "waste heat" and significantly reducing the heat energy consumed to achieve the same indoor temperature. This is of great significance for energy saving and consumption reduction in places with general air quality requirements; for fresh air units, indoor air directly enters the unit and is partially recycled (SH/SHK, TH/THK units), or directly enters the waste heat recovery heat exchanger installed in the unit (THW/THKW units), avoiding the heat loss that is inevitable in the return air duct of traditional air conditioners. The system eliminates the large surface area of ​​the supply and return air ducts, thereby avoiding system duct pollution and heat energy loss. Because the control heat medium (inlet/outlet water) pipe is much smaller than the air duct, and the liquid medium is more convenient to transmit than the gas medium, it is much easier and more reliable to control the leakage of heat medium (inlet/outlet water) and its heat loss than the air duct. This structural form has better thermal insulation effect than the traditional large air duct structure, and saves investment in insulation materials and related costs.





Application areas
The remote jet air conditioning unit is suitable for all kinds of large industrial plants, large warehouses, and large supermarkets. In addition to the disadvantage of high noise, there are also problems such as the centralized air ducts and large air duct sections, which often affect the lighting of the external windows. For industrial plants with overhead cranes, the arrangement of the air ducts and the overhead cranes often conflict. When the building width is large, the middle part is often difficult to get in place, which affects the air conditioning effect. In addition, in order to solve the problem of hot and cold air supply at the same time, traditional central air conditioners sometimes need to set up two sets of air ducts, which further increases the investment and occupies effective space.In response to the special requirements of high-rise and large-space buildings for air conditioning, our company has developed a remote jet air conditioning unit that integrates refrigeration, heating, ventilation, and heat recovery on the basis of the existing ductless induced ventilation technology, through long-term investigation and summary of the experience and lessons of developed countries in the application of air conditioning in high-rise and large spaces. After years of dedicated research, it provides an ideal air conditioning terminal equipment for high-rise and large spaces with a new concept.
Energy-saving system combination mode The central air-conditioning system composed of remote jet air-conditioning units and centralized heat sources is a split central air-conditioning system - centralized heat source (water inlet/return water), decentralized (on-site) heat exchange, and its system combination mode has energy-saving advantages over ducted air-conditioning. This system adopts a strong convection air supply method from top to bottom to deliver the treated air to the working area, so that almost no air stratification will be formed in the entire space, improving temperature uniformity, reducing energy losses caused by roof heat dissipation, and making the system more energy-efficient. Its decentralized heat exchange characteristics make air-conditioning equipment easy to group control and operate, so that users can flexibly use air conditioning according to changes in production situations, production off-seasons, and work and rest time, which is more energy-efficient than the unified operation mode of traditional central air-conditioning and heating methods. Since it performs heat exchange at the site of use, its indoor units (BHV, EHV, EKV) directly circulate and process indoor air, making maximum use of "waste heat" and significantly reducing the heat energy consumed to achieve the same indoor temperature. This is of great significance for energy saving and consumption reduction in places with general air quality requirements; for fresh air units, indoor air directly enters the unit and is partially recycled (SH/SHK, TH/THK units), or directly enters the waste heat recovery heat exchanger installed in the unit (THW/THKW units), avoiding the heat loss that is inevitable in the return air duct of traditional air conditioners. The system eliminates the large surface area of ​​the supply and return air ducts, thereby avoiding system duct pollution and heat energy loss. Because the control heat medium (inlet/outlet water) pipe is much smaller than the air duct, and the liquid medium is more convenient to transmit than the gas medium, it is much easier and more reliable to control the leakage of heat medium (inlet/outlet water) and its heat loss than the air duct. This structural form has better thermal insulation effect than the traditional large air duct structure, and saves investment in insulation materials and related costs.



Application fields
The remote jet air conditioning unit is suitable for air conditioning and heating and air supply in various large industrial plants, large warehouses, large supermarkets, various large wholesale malls, gymnasiums, exhibition halls, multi-function halls and other occasions, especially suitable for:
◆ Single-story high space and air conditioning (heating and cooling) places with high air quality requirements, such as large markets, exhibition halls, airports, and high-grade large industrial plants. In these occasions, the system's ductless structure and the performance advantages of both hot and cold can be fully exerted and reflected; at the same time, the unit can be installed on the roof, which is convenient for the supply of fresh air and subsequent equipment maintenance.
◆ Large ordinary industrial plants in heating areas. In these occasions, the current heating mode is radiator plus heater. The heating facilities artificially divide the workshop, limiting the production process layout and subsequent adjustments. At the same time, the radiation heat transfer method of the radiator has low thermal efficiency in large spaces, and the series structure of the heat sink can only provide uniform heating conditions. It is difficult for users to flexibly adjust according to different usage conditions, resulting in serious waste of heat sources and increased operating costs. The indoor circulation heating unit in this technology is an ideal substitute for radiator plus heater. It not only ensures the complete space of large workshops, but also has a good use effect!