机械专业外文文献翻译-外文翻译--热带地区地板空调系统的室内空气品质和热舒适性的调查 英文版.doc

编号： 毕业设计(论文)外文翻译（原文）院 （系）： 职业技术学院 专 业： 机电一体化工程 学生姓名： ****** 学 号： **自考准考证号** 指导教师单位： 职业技术学院 姓 名： ***** 职 称： ***** 2012年 10月 8日 Indoor air quality and thermal comfort studies of an Under-Floor air-conditioning system in the tropicsAbstract This paper reports thermal comfort and indoor air quality (IAQ) studies of an under-floor air-conditioning (UFAC) system in hot and humid climate. Thermal comfort parameters were measured at predetermined grid points within an imaginary plane to predict the airflow pattern of the supply air jet as well as to determine the occurrence of thermalstratification in the office space. Fanger's [Thermal Comfort Analysis and Applications in Environmental Engineering, McGraw-Hill, New York, 1970] thermal comfort index was also computed to detect the occupants' thermal sensation. Besides, the concentration levels of dust and carbon dioxide were recorded with the intention to examine the quality of the indoor air. Statistical methods were applied to derive the relationship between air velocity and the other parameters as mentioned earlier. The main findings from the study revealed reasonable level of acceptability of IAQ associated with the UFAC system. However, occupants are likely to experience localised thermal discomfort near the supply diffusers due to the existence of large temperature gradients. In addition, a stagnant zone is discovered at sedentary level, which is caused by the parabolic airflow nature of the primary air jet.Keywords: under-floor air-conditioning systems; thermal comfort; Indoor Air Quality; Singapore; office, field trips1 Introduction This concept has been used for many years the concept of cold air from the raised floor computer room. However, these areas rarely occupier and no real attempt to apply for the same air standard office environment comfortable movement. For example, in the early 1960s, the Federal Republic of Germany, (UFAC) under-floor air-conditioning system is the first to introduce high heat production room, such as the electric light bulb factory, the drying device and data processing centers in the textile industry . This is a purchase and then, in the mid-1970s, began to be used, this system general offices mainly in European countries. Open office concept innovation is a change of office layout constraints, traditional ceiling-based air-conditioning system is adopted. The layout of the diffuser, in this case, usually before the establishment of the position of the workstation and the thermal load has been determined. In addition, the partition does not consider the location of air diffusion under surface-enhanced Raman spectroscopy, tend to restrict the flow of air space, causing discomfort to the crew [1]. Based floor air distribution system, residents can enjoy a great deal of flexibility to add, delete, or relocation of supply channels to meet their individual preferences Allocation, as well as any office layout rearrangement. In addition, some systems will automatically thermostat spread on the ground, so that the occupants are required to adjust the temperature. This not only provides personal control, but also caused occupant comfort [2,3]. Then, with the advent of electronic or automated office to improve the installation and service of floor, lay the cable under, to adapt and to conceal. Since the cavity between the concrete slab and flooring create a raised floor tiles, floor invalid and can also be used as a function of the supply air chamber. Therefore, the conditioned air through the floor of the upper chamber from the supply of office space grille. The depth ceiling ventilation system so that you can reduce or eliminate the pipeline system and terminals are no longer there. Therefore, the new building can benefit from a significant height reduction or additional storeys, which in turn led to the huge savings cost [4]. However, the people to move towards IT-based working environment, the use of computer data storage and other work-related functions is essential. Together with other electronic equipment, they are likely to heat load of office space a major contributor. As the temperature of the air is supplied from the floor outlet is usually lower than the indoor air, the high-velocity air, i.e. from the following computer equipment in a cooling faster rate than cold air from a conventional ceiling-based systems. This effectively eliminates the heat engine, otherwise, will be set up, along with the time. However, a potential drawback, in this case, is likely to draft by the households and the feeling, machine condensate [5]. Plenary Session of the concept of supply of cold air from under the floor "is relatively new in Singapore and small studies have carried ou。