What is an outside air economizer?
What is an outside air economizer?
Description. An air-side economizer (see Figure 13 below) brings outside air into a building and distributes it to the servers. If the outside air is particularly cold, the economizer may mix it with the exhaust air so its temperature and humidity fall within the desired range for the equipment.
What is a modulating economizer?
systems. As the weather warms, when the system no longer needs heating, it enters the modulated economizer mode. Outdoor air and recirculated return air modulate to maintain space (or supply-air) temperature at setpoint. Outdoor air provides the needed cooling capacity without any mechanical cooling.
How does an economizer work on a chiller?
An economizer is a type of sub-cooler that uses part of the total refrigerant flow from the condenser to cool the rest of the refrigerant flow (see Figure 10.13). The sub-cooling of the main refrigerant flow (m2) reduces the quality of the inlet vapor to the evaporator, which increases the cooling capacity.
What’s the purpose of an economizer?
An economizer is a mechanical device used to reduce energy consumption. Economizers recycle energy produced within a system or leverage environmental temperature differences to achieve efficiency improvements.
How does a fresh air damper work?
The Fresh Air Damper (FAD) is a 24VAC power-open, power-close motorized air damper designed for installation in a fresh air ventilation duct connected to an outdoor air intake hood and a duct fan or the HVAC return plenum, to control the flow of fresh air into the home.
How does an outdoor air damper work in hot weather?
The logic panel also controls the economizer, sequencing it ahead of the chilled water valve. A double-throw outdoor air thermostat enables the economizer in cool weather and disables it in hot weather.
How are OSA dampers used in an economizer?
• Eliminate outside air for ventilation during unoccupied periods by closing OSA dampers.periods by closing OSA dampers. • OSA damper operation should be monitored and recorded to verify actual operation of economizer. • Percent OSA can be used to verify that the economizer is properly operating.
What do you need to know about an airside economizer?
Section #1 Economizer Fundamentals The Basics of Airside Economizers Airside Economizer: “A duct- and-damper arrangement anddamper arrangement and automatic control system that, together, allow a cooling system to supply outdoor air to reduce or eliminate the Return Relief Air
When to enable or disable the economizer?
– For changeover control, economizer should be enabled and outside air damper modulate full open if outside air conditi l th 85ditions are less than 85°F(d b lb) b t 23F (dry bulb) or between 23 and 32 Btu/lb (enthalpy). • For differential control strategy, economizer will only be enabled when outside air temperature is