INDUSTRIAL VENTILATION DESIGN GUIDEBOOK
Plate Fin-and-Tube Heat Exchangers
1.3.1.4 Introduction A common type of heat exchanger used in industrial ventilation is the plate fin-and-tube heat exchanger (Fig. 9.7). Liquid or gas flows in the Tubes, with a gas or a liquid circulating outside the tubes between the Plates. The plates can be straight or wavy. Wavy plates, due to their greater surface area, […]
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HEAT EXCHANGERS AND HEAT-RECOVERY UNITS General Theory of Heat Exchangers
1.3.1.1 Introduction A heat exchanger is a device that transfers heat from one medium to another; the medium may be a solid, liquid, or gas. Some of the most complex engineering design problems relate to heat exchangers. Heat exchangers are divided into the following types. 1. Recuperator: A wall separating the flowing fluids is the […]
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Summary
The following points should be borne in mind when planning filter installations. • Great care is required regarding the positioning and design of the air intake to avoid drawing in local impurities and rain or snow. • The risk of microbial growth is low, but to minimize the risk, the plant should be designed so […]
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Life-Cycle Issues
9.2.5.1 Environment: Life-Cycle Analysis (LCA) Global environmental questions have increased in significance during the last few years. A life-cycle analysis (LCA) analyzes the environmental effect with reference to ecological effects, health effects, and consumption of resources. Life-cycle analysis of a filter shows that operation often corresponds to 70% to 80% of the filter’s total environmental […]
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Filters in Operation
9.2.4.1 Separation It is important to be aware of the filter’s properties in different environments. Figure 9.2 shows how, in the case of new filters, separation varies with particle size and filter class. The filter class is based on the average efficiency, and a new filter normally has much lower initial efficiency. In the case […]
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Filters and Test Methods
9.2.3.1 Test Methods EUROVENT has always led the field in measuring and characterizing air filters. Since 1979 EUROVENT 4/5 has set the standard in Europe and provided the basis for European Standard EN 779:1993, Specifications for Particulate Air Filters for General Ventilation. EN 779:1993 in principle contains two different test methods. The filter is tested […]
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Atmospheric Air and Dust
Air is made up of a mixture of different gases and material from natural processes such as wind erosion, evaporation from the sea, earthquakes, and from human activity in the form of combustion products from processes and vehicles. 9.2.2.1 Sire of Particles The size of particles is often indicated in pm (microns). 1 firri = […]
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Why Air Filters?
A filter is a component of a system which, in conjunction with other components, can contribute toward a better indoor environment. 9.2.1.1 Ventilation System Protection Several major studies of indoor-air quality problems1 have shown that filters would have been able to prevent blocked ducts, fans, and heat exchangers. Other major IAQ problems such as impurities […]
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AIR FILTERS
The need to separate impurities from air or other gases has increased as regards both the degree of separation and the necessity to separate both gases and finer particles. Correct dimensioning of filters is a prerequisite for the functioning of ventilation systems, for sensitive production, for protecting humans and the environment, and for improving indoor […]
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Aims of an Air-Handling System, Including the Unit and Ductwork
The main objectives are • Contaminant removal from the indoor space and associated processes • Supply of safe cleaned and/or treated air for the occupied spaces • Control of thermal and pressure conditions in treated spaces in a safe, reliable, and energy-efficient manner Aims of ductwork design are • Transport of air to and from […]
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