In HVAC, what is the common temperature range for chilled water?

The common temperature range for chilled water in HVAC systems typically falls between 40°F to 45°F (4°C to 7°C). This range is ideal for several reasons.

Firstly, at these temperatures, chilled water can effectively remove heat from the air in conditioning systems without causing condensation on the cooling coils, which could lead to moisture-related issues or increased humidity levels in the conditioned space. Additionally, temperatures below this range, such as in the 30°F to 35°F range, risk freezing the water in the piping or coils, which can cause significant damage to the system and require costly repairs.

Moreover, operating within the 40°F to 45°F range allows for effective thermal exchange while maintaining energy efficiency in the overall operation of the HVAC system. It ensures that the system can meet cooling loads without unnecessary strain on the chillers, optimizing operational costs and extending equipment lifespan.

Therefore, the correct answer reflects both the operational practice and the technical principles involved in effective HVAC design and performance.