What are the two purposes of an economizer?

The economizer evaluates outside air temperature and even humidity levels. When the exterior air levels are appropriate, it uses the outside air to cool your building. HVAC economizers use logic controllers and sensors to get an accurate read on outside air quality.

What does an economizer do 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 evaporated refrigerant then enters the compressor at an intermediate pressure level.

What is an RTU on a roof?

A packaged rooftop unit, or RTU, is a type of HVAC system that contains all the components needed to provide conditioned air in one concise unit. Packaged rooftop units are commonly found in light and large commercial applications. They are very popular with retail and industrial properties.

Is an Erv an economizer?

An Energy Recovery Ventilator (ERV) allows fresh air into a building, while retaining pre-conditioned heating or cooling. With a standard economizer you draw 400 CFM of outside air, then proportionately remove the same quantity of air using a Barometric Relief, or Power Exhaust.

What is a dry bulb economizer?

Dry Bulb Economizer- This economizer uses a sensor to determine if outdoor air is at or below a certain temperature, usually about 55 degrees F. One measures the return air enthalpy, while the other measures outdoor air enthalpy. Dampers are modulated for optimum and lowest enthalpy to be used for cooling.

What is a low leak economizer?

The Ultra Low Leak Economizer… An economizer employs dampers to deliberately separate air streams of different temperatures. When a damper does not close properly, or contains gaps, and leaks air instead of separating it; the temperature difference, and therefore the energy benefit is degraded.

What is an outside air economizer?

An economizer is a part of a building’s cooling system that uses cool outdoor air to cool the building instead of operating the air conditioning compressor. Economizers cool buildings using outdoor air at night (free cooling).

What is an RTU in construction?

What exactly is an RTU? It stands for “roof top unit.” So now you can guess that this type of HVAC equipment lives on the roof. It’s a self-contained unit that provides both heat and air conditioning for certain types of spaces.

What is a commercial RTU?

The RTU is the most widely used commercial heating and the cooling unit found in the U.S. The rooftop unit is sometimes called a package unit, as all its components are contained in one unit.

Does air mix in an ERV?

An ERV can help here. Like the HRV, it contains a heat exchanger that transfers heat from one air stream to another. Unlike the HRV, the ERV also moves moisture between the two air streams. The less humid air stream absorbs moisture from the more humid air stream, even though the air itself never actually mixes!