How Air-Cooled Chillers Work | HVAC Cooling Explained Air-cooled chillers are one of the most widely used cooling solutions in commercial and industrial HVAC systems. They remove heat from water and reject it directly to the atmosphere using ambient air — eliminating the need for cooling towers. Working Principle of an Air-Cooled Chiller: An air-cooled chiller operates based on the vapor compression refrigeration cycle, which includes four main components: 1. Evaporator – Heat Absorption Warm return chilled water from the building enters the evaporator. Inside the evaporator, refrigerant absorbs heat from the water and evaporates into a low-pressure gas. This process cools the water (typically to 7°C), which is then circulated back to AHUs or FCUs for space cooling. 2. Compressor – Pressure Increase The low-pressure refrigerant gas enters the compressor, where its pressure and temperature increase significantly. This prepares the refrigerant for heat rejection in the condenser. 3...
Pressure transducer in HVAC systems A pressure transducer is an electromechanical device that measures gas or liquid pressure and converts it into a proportional electrical signal (voltage or current) for monitoring and control. In HVAC, these sensors are essential for optimizing energy efficiency, managing airflow, and ensuring system safety by monitoring pressure differentials in ducts, filters, and refrigerant lines. Applications in HVAC Systems Filter Monitoring (Differential Pressure): These sensors monitor the pressure drop across air filters. They detect when a filter is clogged and requires replacement by measuring the difference in air pressure before and after the filter, preventing system strain. VAV (Variable Air Volume) Systems: Transducers are used in VAV boxes to monitor airflow and pressure to ensure the correct amount of conditioned air is delivered to specific zones. Static Duct Pressure Control: They measure the pressure inside supply ducts, allowing the HV...