Heating Ventilating And Air Conditioning (HVAC)

Chiller operating information may include entering and leaving water temperatures, flow where monitored, loads, setpoints, alarms, equipment staging, shutdowns, and maintenance activity. Comparing those records with building demand, pumping and distribution conditions, control sequences, and other HVAC data can help assess whether recorded chiller operation was consistent with the expected cooling demand and operating conditions. The significance of individual parameters, including refrigerant-side pressures where available, depends on the chiller type, refrigerant, equipment configuration, and manufacturer requirements.

A geothermal or ground-source heat pump system includes building-side HVAC equipment and a source-side heat-exchange system that may use closed ground loops, groundwater, or another permitted configuration. Performance issues can involve source-side flow and heat transfer, pumps, controls, heat-pump capacity, loop or water conditions, distribution, or system operation. Design and commissioning documents, temperatures, flow measurements, equipment information, ground-loop or water-source data, and service records can help identify which portions of the system warrant closer evaluation.

Indoor humidity reflects the interaction among moisture generation, outdoor conditions, ventilation, infiltration, heating and cooling operation, and any humidification or dehumidification equipment. A malfunctioning humidifier, inaccurate sensor, unsuitable control sequence, insufficient dehumidification, airflow condition, or ventilation strategy may contribute to humidity outside the intended range. Trend data and field measurements can help identify when the condition occurs and assess which HVAC responses coincide with it, but those correlations should be evaluated with the building load, weather, and system configuration before assigning a cause.