HVAC system maintains desired environmental circumstances in an area. In virtually each software, many choices are accessible to the design engineer to fulfill this fundamental objective. Within the choice and mixture of those choices,, the design. engineer should think about all standards outlined right here, to realize the purposeful
necessities related to the objective.
HVAC SYSTEM ANALYSIS AND SELECTION ASHRAE DOWNLOAD CH#1
HVAC methods are categorized by the strategy used to regulate heating, ventilating, and air-con within the conditioned space. This chapter addresses procedures for choosing the suitable system for a given software. It additionally describes and defines the design ideas and traits of fundamental HVAC methods. Chapters 2 by means of 5 describe particular methods and their attributes, based mostly on their heating and cooling medium and generally used variations.
This chapter applies to HVAC conversion, upgrades, retrofits, constructing renovations and growth, and new development. This evaluation and choice course of helps decide the optimum system(s) for any constructing. No matter facility kind, evaluation examines goal, subjective, short-term, and long-term targets.
SELECTING A HVAC SYSTEM
The design engineer is accountable for contemplating numerous methods and recommending one or two that can meet the objective and per kind as desired. It’s crucial that the design engineer and proprietor collaborate to figuring out and prioritize standards related to the design objective. Occupant consolation, course of heating, and cooling or air flow standards could also be thought of, together with the next:
- Operating cost, including energy and power costs
- Flexibility
- First cost
- Mean radiant temperature (MRT)
- Air motion
- Mold and mildew prevention
- Sustainability of design
- Life cycle analysis
- Temperature
- Humidity
- Air purity or quality
- Air and water velocity requirements
- Space pressure requirements
- Redundancy
- Maintenance cost
- Acoustics and vibration
- Air changes per hour
- Local climate
- Capacity requirements, from a load calculation analysis
- Spatial requirements
- Reliability
- Acoustics and vibration
As a result of these elements are interrelated, the proprietor and design engineer should contemplate how these standards have an effect on one another. The relative significance of things comparable to these varies with totally different house owners and sometimes adjustments from one undertaking to a different for a similar
proprietor. For instance, typical proprietor considerations embody first value in comparison with working value, extent and frequency of upkeep and whether or not that upkeep requires getting into the occupied house, anticipated frequency of system failure, impact of a failure, and time required to right the failure. Every concern has a unique precedence, relying on the proprietor’s targets.
ASHRAE DOWNLOAD CHAPTER NO. 1
For more details about HVAC selection and system analysis please read the following document
hvac system selection and system analysis ASHRAE EQUIP SI CH 1