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

summary: "This ebook offers instruments and information to layout, fee, and function lively and passive beam structures to accomplish a made up our minds indoor weather. It additionally offers examples of lively and passive beam calculations and decisions"

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Extra info for Active and passive beam application design guide

Sample text

The calculated dew point must then be compared to the supply water temperature. 49 Active and Passive Beam Application Design Guide In response to the sensor feedback, chilled-water supply temperature setpoint can be reset above the room dew point or the supply water to the zone can be halted. Figure 10-9 presents a control strategy in which the chilled-water supply temperature is varied in accordance with the space dew-point temperature. In this case, the beam chilled-water temperature control system maintains a minimum differential between the space dew-point temperature and its chilled-water supply.

FIGURE 10-8 Surface condensation sensor. FIGURE 10-9 Condensation prevention strategy involving reset of beam chilled-water supply temperature. 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.

This can be accomplished by any of the following methods: • Four-pipe coil with independent loops for heating and cooling • Two-pipe water distribution system where heating and cooling are accomplished through the same loop • Hot-water or electric resistance heating coil in the duct feeding the thermal zone to heat the primary air as required by the space heating demand (chilled-water flow remains off) As in cooling mode, the heating capacity of active beams is dependent on the primary airflow rate and induction of room air.

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