Ventilation Air Conditioning

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ISBN-10: 1936504839

ISBN-13: 9781936504831

"This booklet presents instruments and suggestions to layout, fee, and function lively and passive beam structures to accomplish a decided indoor weather. It additionally offers examples of energetic and passive beam calculations and selections"--

summary: "This e-book offers instruments and counsel to layout, fee, and function lively and passive beam structures to accomplish a decided indoor weather. It additionally provides examples of energetic and passive beam calculations and decisions"

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Extra resources for Active and passive beam application design guide

Example text

46 10 Controls FIGURE 10-3 Beam zone temperature control with demand-controlled ventilation. FIGURE 10-4 Active beams installed in a classroom. Courtesy: Swegon 47 Active and Passive Beam Application Design Guide Figure 10-7 illustrates the use of a heat exchanger and separate, closed water loop. The primary water flow in the heat exchanger is modulated to maintain the beam chilled-water supply temperature; this is used when there are several uses of the primary chilled-water circuit. Beam chilled-water temperature control is a closed-loop control system in which the supply water temperature is controlled via adjustment of the water flow through a two- or three-way control valve or heat exchanger installed on the suction side of the pump.

A typical installation can be seen in Figure 11-1. Support location and installation should be done in accordance with manufacturer’s documentation. Upon final positioning of the beam, all support connections should be adequately tightened and secured. 2 CONNECTION TO WATER SYSTEM Beams are typically connected to the main supply and return water pipes with flexible hoses using threaded connections or push-on fittings to provide some freedom of movement for the beams. Oxygen-diffusion-resistant hoses may prevent diffusion into the water system and minimize corrosion.

2 Reactive Strategies Condensation sensors such as those shown in Figure 10-8 are devices that are used to detect moisture on the chilled-water supply pipe. When an indication of moisture is received from the sensor, the water supply is stopped or its supply temperature is increased. This is a reactive method that can stand alone or form part of a total strategy. Modern condensate sensors are very sensitive to the smallest amount of moisture forming. Condensation detected on the supply pipework does not mean that the chilled beam will start to condensate and then drip.

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