Xem 1-13 trên 13 kết quả Hvac equipment
  • HVAC systems are sized to satisfy a set of design conditions, which are selected to generate a maximum load. Because these design conditions prevail during only a few hours each year, the HVAC equipment must operate most of the time at less than rated capacity. The function of the control system is to adjust the equipment capacity to match the load.

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  • The HVAC designer cannot neglect consideration of the sound and vibration generated by HVAC equipment. This chapter briefly discusses the fundamentals of sound and vibration control. References for further study are cited at the end of the chapter.

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  • The purpose of this chapter is to outline the criteria used in the HVAC system and equipment selection process, to describe some of the systems and equipment available, and to develop some of the underlying philosophy and background related to system selection. Details of specific systems and items of equipment are discussed in later chapters.

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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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  • Design documents evolve from and include the designer’s calculations, equipment selections, and sketches and are usually presented through formal drawings and specifications. These construction documents are the legal means by which the designer conveys the owner’s expectations to the contractor. The importance of good documentation cannot be overemphasized.

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  • Cooling means the removal of heat. In HVAC, a cooling process is usually identified as one which lowers the temperature or humidity (or both) of the ambient air. The effective temperature includes not only the temperature and humidity of the ambient air but also radiant effects and air movement. Some adiabatic cooling processes, i.e., evaporative cooling, do not actually remove any heat, but create a sensation of cooling by lowering the sensible temperature of the air.

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  • Pipe stress analysis calculates the stress in a piping system subject to normal operating loads such as pressure, weight, and thermal expansion, and occasional loads such as wind, earthquake, and water hammer. Because all piping systems are connected to equipment such as vessels, tanks, pumps, turbines, and compressors, the piping stress analysis also involves evaluation of the effect of the piping forces and moments to the connecting equipment. As the piping stress is controlled by the arrangement of the supports and restraints, the scope of piping stress includes also pipe supports.

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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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  • This section describes heating, ventilating, and air conditioning (HVAC) systems and discusses characteristics and components of automatic control systems. Cross-references are made to sections that provide more detailed information. A correctly designed HVAC control system can provide a comfortable environment for occupants, optimize energy cost and consumption, improve employee productivity, facilitate efficient manufacturing, control smoke in the event of a fire, and support the operation of computer and telecommunications equipment....

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  • Managing and controlling traffic on ramps is important because freeway entrance and exit ramps are the only facilities motorists may use to legally make connections to and from limited access facilities and as such represent the only locations where traffic entering and exiting a limited access facility can be controlled. Often, ramps are too closely spaced, do not offer adequate acceleration distances for posted speeds, or are simply overwhelmed by the increasing number of motorists that use them on a daily basis.

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  • The ConnectM Energy Management Solution is designed to help you intelligently monitor, and optimise the energy consumed by the various energy assets like lighting, HVAC, and DG sets. ConnectM also leverages the solution framework for enhancing the in-building fire and security operations.Lighting & HVAC ConnectM focuses on Energy technologies (Clean Tech) with its Energy Management Solution. Organizations spend typically about 20% of their energy on lighting, 60% on HVAC, 10% on their Datacenters and 20% on essential equipments & machineries....

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  • The Digital Building Telecommunications Access Guideline Foreword Scope and Purpose Digital River The Process More information and comments Principle 1: Spatial Access and Design 1.1 Introduction 1.2 Communications Network Architectures 1.3 Telecommunications Service Entrance 1.4 Equipment Room 1.5 Backbone Pathways or Riser Shafts 1.6 Telecommunications closets (TC) 1.7 Horizontal pathways 1.8 Radio (Wireless) Facilities Provision 1.9 Standards & References Principle 2: Diversity 2.1 Building Entry Point (BEP) 2.2 Equipment Room 2.3 Riser Shafts 2.

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