By American Society of Heating
The 2008 ASHRAE instruction manual - HVAC platforms and kit discusses a number of platforms and the apparatus (components or assemblies) that contain them, and describes positive factors and modifications. this knowledge is helping procedure designers and operators in determining and utilizing gear. it's divided into seven sections:
- Air-Conditioning and Heating structures
- Air-Handling apparatus and elements
- Heating apparatus and elements
- Cooling apparatus and parts
- General elements
- Packaged, Unitary and Split-System gear
Read or Download 2008 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition) PDF
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Extra resources for 2008 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition)
Single-Fan, Dual-Duct System. This system (Figure 11), frequently used as a retrofit to an antiquated dual-duct, single-fan application during the 1980s and 1990s, uses a single supply fan sized for the peak cooling load or the coincident peak of the hot and cold decks. Fan control is from two static-pressure controllers, one located in the hot deck and the other in the cold deck. The duct requiring the highest pressure governs the airflow by signaling the supply fan VFD speed control. An alternative is to add discharge supply air duct damper control to both the cold and hot ducts to vary flow while the supply fan operates up and down its fan curve.
This method is an extension of the single-duct VAV system: one supply duct offsets exterior transmission cooling or heating loads by its terminal unit with or without auxiliary heat, and the other supply air path provides cooling throughout the year. The Variable-Air-Volume System with Reheat and Induction and Fan-Powered Devices Fig. , it is warm in winter and cool in summer). Often, however, the primary-air fan is limited to operating only during peak heating and cooling periods to further reduce energy use.
Fig. 2 Direct-Expansion or Chilled-Water Cooling and Dehumidification Air Handling and Distribution Fig. 5 Direct Spray of Water in Airstream Cooling Fig. 4 Fig. 3 Direct Spray of Water in Airstream Cooling spraying or dripping recirculated water onto a filter pad (see the section on Humidification). • The wetted duct or supersaturated system is a variation of direct spray. In this system, tiny droplets of free moisture are carried by the air into the conditioned space, where they evaporate and provide additional cooling, reducing the amount of air needed for cooling the space (Figure 4).