Why DX Systems Fail To Control Humidity

Описание: Hope you enjoy this LIVE presentation by Chris Adams, PE. Go to timestamp 13:00 min for the start of the event. Chris is the VP of Engineering here at Insight Partners and does a great job explaining "Why DX Systems Fail To Control Humidity".
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Previously recorded on Friday, March 26th at 11:30 AM Eastern in front of a LIVE audience at the Orlando AAON Dubsdread event.

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Some of the topics discussed in this video:

We use graphical examples and the psychrometric chart to show how dew point temperature and humidity percentages are very different.

Relative Humidity:
Not a good measure of water in the air (absolute humidity). RH is the percentage of how much moisture is in the air vs. how much it can hold. It answers the question “how full is the container”?

Dew Point:
The atmospheric temperature below which water droplets begin to condense and dew can form. This is an accurate measurement of water in the air (humidity).

Properties of Air. We explain the difference between Dry Bulb, Wet Bulb, Relative Humidity, Humidity, and Dew Point.

We look at psychrometric processes such as cooling, heating, humidification, dehumidification, cooling, and dehumidification.

Relative Humidity vs. Dew Point

Modulating hot gas reheat, the more advanced form of reheat, allows us to precisely control the HVAC system leaving air temperature. As opposed to the older style electric reheat, which works well but wastes a lot of energy. Advances in HVAC controls and technology in HVAC systems over the years have made hot gas reheat very popular.

Energy recovery wheels are commonly applied to HVAC systems with the intent of saving energy. Some believe that the addition of an energy recovery ventilator will protect the conditioned space from high humidity at part load.

In this video, we look at an AC system with a rotary wheel heat exchanger and simulate space conditions at part load. ERV’s can be used to recover energy from the exhaust stream but do little to protect us from higher dew point levels at off-peak conditions.