Air handling systems

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  • By definition, air conditioning involves control of the air temperature, humidity, cleanliness, and distribution. It follows that an air-handling unit (AHU) of some kind is an essential part of an air conditioning system, though not necessarily of a heating-only system. The function of the AHU is to provide air at a quantity, temperature, and humidity to offset the sensible and latent heat gains to the space (in the cooling mode) and the heat losses (in the heating mode), while maintaining the required temperature and humidity in the space....

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  • All air-handling units (AHUs) and many terminal units, if they are not self-contained, require a source of heating and/or cooling energy. This source is called a central plant, and the means by which thermal energy is transferred between the central plant and the AHU is usually a fluid conveyed through a piping system. The fluids used in HVAC practice are steam, hot or cold water, brine, refrigerant, or a combination of these. The equipment used to generate the thermal energy is described in Chap. 7. In this chapter we discuss the transport systems. ...

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  • In most HVAC systems, the final energy transport medium is moist air—a mixture of dry air and water vapor. This is conveyed through filters, heat exchange equipment, ducts, and various terminal devices to the space to be air-conditioned. The power to move the air is supplied by fans. This chapter discusses fans and duct systems, together with related subjects such as grilles, registers, diffusers, dampers, filters, and noise control.

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  • During the past 20 years, design and operation of the comfort systems for buildings have been transformed because of energy conservation imperatives, the use of computer-based design aids, and major advances in intelligent management systems for buildings. In the 1970s, rules of thumb were widely used by designers. Today, a strong analytical basis for the design synthesis process is standard procedure. This handbook describes the latest methods for design and operation of new and existing buildings.

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  • With the new millennium comes change. Indoor air quality methodologies have expanded, evolved, andmorphed. The focus is shifting froma knee-jerk to a more proactive response. Although indoor air quality in older buildings will continue to present old challenges, new construction is going forward with new challenges.

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  • The purpose of this manual is to provide the reader with a fundamental understanding of controls and how they are applied to the many parts of heating, ventilating, and air conditioning systems in commercial buildings. Many aspects of control are presented including air handling units, terminal units, chillers, boilers, building airflow, water and steam distribution systems, smoke management, and indoor air quality.

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  • TÓM TẮT Nội dung bài báo đề cập tới giải pháp tự động hóa tòa nhà của hãng JohnSon Controls. Bài báo tập trung giải quyết cụ thể về chương trình điều khiển và giám sát cho hệ thống xử lý không khí AHU của hãng JohnSon Controls. 1.

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  • The purpose of this manual is to provide the reader with a fundamental understanding of controls and how they are applied to the many parts of heating, ventilating, and air conditioning systems in commercial buildings. Many aspects of control are presented including air handling units, terminal units, chillers, boilers, building airflow, water and steam distribution systems, smoke management, and indoor air quality. Control fundamentals, theory, and types of controls provide background for application of controls to heating, ventilating, and air conditioning systems. ...

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  • Hospitals, by their very nature, are dangerous places. Sick and infected patients are clustered together in one institution, often in close proximity to those who are immunosuppressed due to recent surgery, chemotherapy or transplantation. Contact between these various patient groups is easily achieved via the hands of healthcare workers (HCWs), use of shared equipment or the hospital’s air handling system.

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  • Data granularity: The data within a P2P system can be accessible at many degrees of granularity. At the atomic granularity level, data consists of a collection of indivisible objects, e.g., complete MP3 files. For data placement at this level, we have to either place an entire object at a peer, or not at all; this is the semantics currently supported by today’s P2P systems. At the hierarchical granularity level, sets of objects can be grouped into larger objects, thus forming hierarchies.

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  • Technology is the making, modification, usage, and knowledge of tools, machines, techniques, crafts, systems, methods of organization, in order to solve a problem, improve a preexisting solution to a problem, achieve a goal, handle an applied input/output relation or perform a specific function. It can also refer to the collection of such tools, machinery, modifications, arrangements and procedures. Technologies significantly affect human as well as other animal species' ability to control and adapt to their natural environments.

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  • Trường Đại học Bách Khoa Hà Nội Hanoi University of Science and Technology Hệ thông Thông tin Hàng Không TS. Đỗ Trọng Tuấn Bộ môn Kỹ thuật thông tin © HUST 2012 .Trường Đại học Bách Khoa Hà Nội Hanoi University of Science and Technology Hệ thống Thông tin Hàng Không © HUST 2012 .Teminologies ATN: Aeronautical Telecommunications Network AFTN: Aeronautical Fix Telecommunications Network AMHS: Air Traffic Service Message Handling System 3 .Development Trends .

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  • When it is necessary to add refrigerant to a system after a loss it indicates that there is a leak in the system. The leak must be located, repaired and the system leak tested. If the leak is found to be on the low side of the system the repair can be made after the system has been ‘pumped down’ to a balance in pressure. Do not draw in any air which contains moisture, especially where hygroscopic ester oils are concerned, (for example R134a). Some oils are not affected and accept the ingress of air and moisture, recovering after a vacuum is drawn with a recovery unit....

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