Air-handling

UE 910 Standardfor Safety, Test Methodfor Fire and Smoke Characteristics of Electrical and Optical Fiber Cables used in Air Handling Spaces, Underwriters Laboratories, Inc. Northbrook, lU., 1985. 

Another serious distraction to a process operator is the multiple alarm event, where a single event within the process results in iTuuti-ple alarms. When the operator must individually acknowledge each alarm, considerable time can be lost in silencing the obnoxious annunciator before the real problem is addressed. Air-handling systems are especially vulnerable to this, where any fluctuation in pressure (for example, resulting from a blower trip) can cause a number of pressure alarms to occur. Point alarms (high alarms, low alarms, status alarms, etc.) are especially vulnerable to the multiple alarm event. This can be addressed in one of two ways ... 

Figure 20-87 shows a typical production-size batch fluid-bed granulator. The air-handling unit dehumidifies and heats the inlet air. Heated fluidization air enters the processing zone through a distribu-... 

The vendor will convert the component flow data into an air equivalent." Since jets are rated on air handling ability, he can then build up a system from his standard hardware. The vendor should provide air equivalent capability data with the equipment he supplies. Determination of air equivalent can be done with Equation 1. 

A reverse philosophy in sizing ejectors is occasionally applicable to a system in which even a small quantity of air leakage will upset the operation or contaminate the product. In such a system it may be desirable to install an ejector having a deliberately limited air handling capacity, so that the system cannot be operated until an injurious rate of air leakage is corrected. 

To estimate the time required for an ejector to evacuate a system from atmospheric pressure down to the design pressure, assume that the average air handling capacity during the evacuation period is twice the design... 

Association of Finnish Manufacturers of Air-Handling Equipment, Helsinki, Finland... 

This chapter describes the room air conditioning process, including the interaction of different flow elements room air distribution, heating and cooling methods, process sources, and disturbances. Air handling equipment, including toom air heaters, is discussed in the form of black boxes as far as possible. 

Now we will consider a balance borderline of the system presented in Fig. 4.14. The system can be any part of the air surrounding the process device. If an air-handling application is considered, the balance can be calculated over the. inner air of a room, an office, or an industrial hall, for example. 

The tai et level concept was introduced and developed by the Association of Finnish Manufacturers of Air Handling Equipment (AFMAHE) in 1985. - Indoor climate target levels have been utilized in the ventilation of public buildings, apartments, and offices for years.The Finnish Institute of Occupational Health began to develop the concept for industrial ventilation in 1991.Tf The target level procedure for industrial air quality is described in more detail in Section 6.4. 

Air-handling units equipped with heat recovery and sophisticated control of the key parameters of HVAC systems, such as temperature, airflow rate, and pressure difference... 

Normally there is some connection between the airflow rate and noise and vibration generation. This could modify the building construction either to prevent spreading or to diminish the levels of noise and vibrations from the air-handling units. This naturally includes all parts of these units, i.e., fans, pumps, and valves (see Chapters 5 and 9). The demands on noise insulation also include the noise and vibrations from the process equipment, which often has a higher level of noise and vibration than the ventilation system. 

Aims of an Air-Handling System, Including the Unit and Ductwork 680... 

Criteria for Acceptable Air-Handling Units and HVAC Sjrstem Noise Levels 800... 

The purpose of this chapter is to present the basic features of air-handling processes and equipment. The aim is to provide a link between the basic theories of air-handling processes, presented in Chapter 4, and the actual equipment covered in the Systems and Equipment book. 

This chapter deals with the basic air-handling processes filtration of particles and gaseous substances from the supply and recirculated air, air heating and cooling, heat-recovery processes, and humidification and dehumidification. It also describes fans and ductwork. 

The basic topic of this chapter is theoretical aspects of air handling units, ductwork design, and the optimization of building energy systems. 

Chapter 4 covers the physical fundamentals of the air-handling processes, for example, how to construct the Mollier diagram. This chapter describes the basic proces,ses, for example, how to apply the Mollier diagram as a basic tool in... 

The air-handling processes should be arranged to take into account the thermal, aerodynamic, and acoustic factors air quality moisture control and cleanliness and other hygiene aspects. 

These issues relate certain requirements of the layout of the air-handling system and individual units, including the question of whether to select centralized or decentralized systems, and the number of units required in the building. 

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