HVAC Air Treatment Quiz

The amount of heat energy needed to raise the temperature of air to a desired level.

The amount of heat energy removed from air to cool it down.

The rate at which liquid water is produced when humid air is cooled to its dew point.

The mass of water vapor per unit mass of dry air in a mixture.

A device within an HVAC system that is used to lower the relative humidity of air.

A cold battery is an air treatment device that lowers the relative humidity of air due to the process of condensation. In the case of humid air, the cold battery cools the air below its dew point, causing some of the water vapor to condense out, thus lowering the humidity.

A hot battery is an air treatment device that increases the temperature of air, which can also increase the relative humidity of the air. This is because warmer air can hold more moisture.

A vapor humidifier is a type of humidifier that adds moisture to the air by vaporizing water. This process increases the absolute humidity of the air, but it's important to note that it can also increase the relative humidity, depending on the initial conditions of the air and the amount of moisture added.

A bypass register is a component found in plate heat exchangers. It's used to control the amount of airflow that goes through the heat exchanger. This can be used to adjust the temperature of the air being heated or cooled.

Glycol is used in hot water heating systems to prevent the water from freezing. The glycol lowers the freezing point of the water, which helps to prevent pipes from bursting in cold weather.

The heating capacity needed for an electric heater for a specific air volume depends on the initial temperature and humidity, as well as the desired final temperature and humidity. This is because the required heat energy depends on how much the air's temperature needs to be increased and how much humidity needs to be removed.

A type of heat recovery device that can capture and transfer both heat and water vapor. It typically uses a rotating wheel to capture heat from exhaust air and transfer it to incoming fresh air.

A vapor humidifier is designed to saturate air to the point where it can hold no more moisture at a given temperature.

Electrodes play a crucial role in the operation of adiabatic humidifiers. They generate electrically charged water droplets, which are then dispersed into the air stream, increasing humidity.

The isothermal process occurs when the temperature of the air remains constant, even as the air stream undergoes changes in humidity or pressure. This is achieved using a cooling coil, which removes heat from the air while keeping the temperature steady.

An adsorption wheel is a specific component capable of reducing humidity in a controlled manner. It uses a material that absorbs moisture from the air stream, allowing for precise control over humidity levels.

Mixing heated and cooled air streams to regulate the overall temperature poses significant drawbacks. These drawbacks primarily relate to energy efficiency, as the mixing process is often wasteful, resulting in higher energy consumption.

To accurately calculate the cooling power needed for a cooling coil, specific information is required: the air flow rate, the initial air temperature (entering the cooling coil), and the desired final air temperature (exiting the cooling coil). Without this data, the needed cooling power cannot be determined.