HVAC System Design

A VAV system enables a single RTU to supply air to different zones with different cooling demands. The RTU provides air at a constant temperature. But the airflow will vary depending on the air pressure in the supply air duct. VAV terminal boxes placed downstream of RTU in the corresponding zones will control the zone temperature by modulating the airflow based on the input from a zone temperature sensor. A VAV system comprises the following:- Rooftop unit with an RTU controller controlling supply air temperature and supply duct static pressure. A VAV terminal box with direct digital control(DDC). SELECTING ROOF-TOP UNIT (RTU) RTU should have external static pressure (ESP) of atleast 2 in. wg. This ensures that each VAV terminal box receives sufficient airflow at the right air pressure to deliver the maximum design airflow to the zone. The supply air temperature/leaving air temperature should be constant at 55°F. Entering air temperature for cooling should be mix-air temperature for sy

HVAC (Heating, Ventilation, and Air Conditioning) is a crucial part of any building's infrastructure, and its design can greatly impact the comfort, health, and energy efficiency of its occupants. In this article, we'll take a look at the basics of HVAC system design and why it's so important. What is HVAC System Design? HVAC system design involves the planning and creation of a heating, ventilation, and air conditioning system for a building. This includes the selection of appropriate equipment, the calculation of heating and cooling loads, the design of ductwork and piping systems, and the integration of controls and monitoring systems. Why is HVAC System Design Important? HVAC system design is important for several reasons: Comfort: A well-designed HVAC system ensures that the indoor temperature, humidity, and air quality are maintained at comfortable levels. Health: Good ventilation helps to prevent the buildup of indoor air pollutants and helps to reduce the risk of in