By American Society of Heating
The 2008 ASHRAE instruction manual - HVAC structures and kit discusses numerous structures and the gear (components or assemblies) that contain them, and describes positive aspects and variations. this data is helping method designers and operators in picking out and utilizing gear. it truly is divided into seven sections:
- Air-Conditioning and Heating platforms
- Air-Handling gear and elements
- Heating gear and elements
- Cooling gear and elements
- General parts
- Packaged, Unitary and Split-System apparatus
Read or Download 2008 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition) PDF
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Additional info for 2008 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition)
Hot-water preheat coils should be piped for counterflow so that the coldest air contacts the warmest part of the coil surface first. Consider a constant-flow recirculating pump if the local climate and anticipated percentage of outside air may result in freezing conditions at a hotwater preheat coil. Chapter 26 provides more detailed information on heating coils. Cooling Coil Sensible and latent heat are removed from the air by the cooling coils. The cooling medium can be either chilled water or refrigerant, in which case the refrigerant coil serves as the evaporator in a vaporcompression refrigeration cycle.
Both of these processes add heat, often called the latent heat of wetting, to the air being dehumidified. Usually about 200 Btu/lb of moisture is removed (Figure 8). These systems should be reviewed with the user to ensure that the space is not contaminated. Chapter 23 has more information on this topic. , outside and return air) into a common airstream can be shown on a psychrometric chart with reasonable accuracy (see Chapter 6 of the 2005 ASHRAE Handbook—Fundamentals). The following sections describe many commonly available airhandling unit components.
Higher outside air quantities may be required to reduce odors, volatile organic compounds (VOCs), and potentially dangerous pollutants. 1 provides information on ventilation for acceptable indoor air quality. , control or reduction of contaminants such as VOCs, formaldehyde from furnishings, and dust) must be reviewed by the engineer. Economizers An air-side economizer uses outside air to reduce refrigeration requirements. Whereas a logic circuit maintains a fixed minimum of ventilation outside air in all weather, the air-side economizer is an attractive option for reducing energy costs when weather conditions allow.
2008 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition) by American Society of Heating