Weak current College】 【HVAC design should pay attention to some key issues (2).

<br> <br> 4. security issues <br> <br> Design of security is ever consider fewer problems, with the United States "9 · 11" and other terrorist attacks as well as the emergence of SARS and the rapid spread of .HVAC system security issues have become the focus of public attention, the SARS epidemic era, people seriously and even fear in the air conditioning system and not afraid to use, this will be on the HVAC industry have a profound impact. <br> <br .> After careful analysis of these events, research and reflection, engineering design, equipment, operation management, regulatory and technical measures, and many other aspects to improve the security of your HVAC system. In large and medium-sized construction design phase, on the .HVAC system for safety assessment will be necessary. <br> <br> HVAC system security including flammable and explosive environment safety, fire safety, people, environment, security of important equipment goods environment security, system equipment safety five issues. In the design of .the munitions factory and warehouse, coal mines and other explosive engineering ventilation and air-conditioning system, security becomes an important factor must be taken into account, should take appropriate measures for explosion protection technology programmes and. In the design of fuel gas boiler room should .be considered flammable gases, liquids, disclosure of security problems, you should set the combustible gas leak alarm system and emergency ventilation system and mutual interlocking. Fire safety issues should be dealt with in accordance with the relevant fire design specifications to consider, as detailed here .. Device security issues including refrigeration system security, North anti-freezing HVAC system, air-conditioning system, electric heating and fan interlock protection issues. When the programme design, consideration should be given to the HVAC system failure may on indoor important equipment and materials .produces a negative impact, for example, important engine room, important repositories and heritage Treasury should not be used to set the ceiling fan-coil air conditioners, because once the chilled water system leakage would cause serious losses. <br> <br> Personnel .environment security principal includes HVAC system on human hazards and prevent terrorist attacks and prevent the spread of infectious diseases by these three aspects. Using ammonia refrigeration programmes, consideration should be given to ammonia leaks harm to the human body. Boiler room layout staff security issues should .be considered. In terms of preventing terrorist attacks and prevent the spread of infectious diseases, you should be aware of the new air conditioning is the weakest link, so you must take precautions that can be *, the new outlet should be set in difficult to .access, are not vulnerable to pollution. As the air conditioning system back into the air a lot, so it is most vulnerable to terrorists and biochemical attack air conditioning system, if you do not take special measures, it is also the most easily spread of .epidemic diseases in the form of air conditioning systems. From this point of view, split air conditioner, multi-split air conditioner, fan-coil air conditioning system security better. In systems with the new amount of wind, in addition to some of the .factors considered in the past, but also during the epidemic disease outbreaks, diluted concentration of indoor harmful viruses. In this regard, you should be careful not to go the other extreme, excessive air conditioning system security alarm is unnecessary. For example, in order .to prevent the spread of infectious diseases and the use of the new wind of DC system, it is clearly unreasonable, this will make the investment, energy consumption and operating costs increased significantly, the key is to rationally determine system solutions and the new amount of .wind, strengthening organized exhaust and insulation-heat recovery equipment, enhancing air filtration and disinfection. System of ventilation rate should be adjusted, usually run as normal air, during an outbreak of epidemic disease or indoor pollution by biochemical demand a larger amount of wind run .. Ceiling concealed fan coil air duct connections should be used, the ceiling should not be used as a static pressure Chamber of ceiling return air. Also in table coolers, cooling towers, evaporator and condensation water, where the bacteria can easily breed should be taken .to be * drainage and disinfection measures. <br> <br> 5. environmental impacts <br> <br> With the rapid development of industrial production and the people's standard of living, environmental protection issues are becoming more and more attention, but the .smoke-fired boilers and the northern city of the main sources of atmospheric, Beijing and other major cities on coal-fired boiler is severely restricted, and the limits of the area continues to expand. In these areas, the relationship between environmental impact as to .the feasibility and design. Select the design should pay special attention to environment protection requirements increasing trend, avoid building built soon to be transformed. When the air conditioning equipment selection, paying special attention to the variety of freon refrigerant substitution process requirements, you cannot choose .to have or will soon be disabled refrigerant for air conditioning refrigerant products. In this regard HVAC designers should have a sense of responsibility for environmental protection, while also considering building parties and users of affordability, not rashly, so as not to give the construction party .and user added unnecessary burden. In the design of programmes and economic analysis, it should also be considering HVAC equipment for waste gas, waste water, waste and noise and pollution. <br> <br> How to design the emission of ozone layer destruction .and damage caused by the greenhouse effect, systems and equipment throughout the entire process (including equipment, usage weeding out process of the whole process) of energy and resource consumption, a comprehensive, science, and quantitative assessment of the economy, is an in- .depth study of the problem. <br> <br> 6. design of some mistakes in comparison <br> <br> Because design is an influencing factor, professional highly technical work on complex technology, even the HVAC professional designers, to the many .design options, selected the best solution is not easy for an outsider is the fog, look at the flowers. At present the work in some of the misconceptions. For example, consider using the latest technology design is best design, regardless of the use conditions .and the blind pursuit of new technology trends, even as a selling point for speculation. In fact each programme has its applicability and scope, in its application, the advanced technology program might have become unreasonable or impracticable. A design plan for a project may be .the best solution, but for anotherProjects may not be feasible, so select the programmes to be fashionable, when you cannot get this treatment. Also tend to believe that investment minimum programme is the best solution, but an investment programme may be low because of its .high operating costs or equipment life is very short, needs regular replacement, in the long run is not economically viable. In the evaluation design, often considered a complex programme is a high level of scenarios. But in fact because of the more complex the system ., the more often the equipment, the higher the investment, the system may *, operability, controllability and serviceability, the greater the difference, so complex programmes does not necessarily have to be a high level of design, to meet the requirements of the system .simpler, the better. In addition, when you do not choose a design without analysis of use of construction party, because building normally not HVAC professional designers, it is not possible to design a comprehensive technical and economic analysis. Therefore deal with the construction of .the parties to enter into serious analysis, economic analysis, through comprehensive technical comparison to determine the best design. <br> <br> 7. closing remarks <br> <br> HVAC design choice is a direct relationship to the HVAC project success and .economic benefits and disadvantages of important issues. HVAC design and optimization is a broad, influencing factors more complex technology. An excellent programme of HVAC project design, design for a variety of factors involved in the overall consideration, making it the most comprehensive benefits. Comprehensive .consideration of the factors, the more often the higher the level of programme design, and its design, the greater the workload and complexity. But since the current engineering design cycle generally shorter, HVAC professional design charge is too low, design fees and design of .economic profit not hook and some technical problems are not solved and other reasons, in the actual design work are often not able to design more comprehensive programme more parameters: a comparative analysis and optimization, design choices prone one-sidedness and subjectivity, the resulting economic .losses were considerable. It attracts attention of the technology of design management and two ways to make a lot of work. Comparison of the design must be selected on the design of the project's actual demand, environmental conditions, features, requirements, and the trend of .environmental conditions, in-depth research on the characteristics of the various technical programmes, the applicable conditions and scope of the objective, in-depth analysis, HVAC technology development and trends have proven especially must be on the feasibility of various design options, security, .investment, energy consumption and operating costs, regulatory, operational, management convenience, environmental impact, comfort and appearance, and other technical and economic evaluation factors for objective, accurate and comprehensive analysis. The only way to various design options for comparison and selection of science ., avoid one-sided and subjectivity of mistakes and economic loss. <br> <br> <br> <br> <br>.