What is the constant temperature at which terminal reheat systems supply air?

In terminal reheat systems, the constant temperature at which they supply air to spaces is designed to enhance comfort and efficiency in HVAC systems. The correct choice of 12.5°C (55°F) reflects the standard practice in which air is supplied at a temperature that is cool enough to provide a comfortable environment without creating drafts or discomfort for occupants. This temperature is commonly used as it helps to maintain a balance between energy efficiency and comfort by ensuring the air is not too cold to cause discomfort.

Maintaining the supply air at 12.5°C (55°F) allows for effective temperature control in occupied spaces, particularly when heating is required. This temperature is also significant because it is above the dew point, which helps prevent condensation issues within the ductwork and living spaces.

Understanding the purpose and design parameters of terminal reheat systems helps appreciate why this particular temperature is chosen over other typical choices that may either be too warm or too cold for effective heating or cooling applications.