Example of Fault Detection and Diagnostics: Pneumatic actuator leak and Filters in Alarm
Pneumatic actuator leak The building HVAC systems are controlled via a DDC front end connected to pneumatic actuators out in the field. The heating and cooling valves for a large 100% outdoor air-handling unit (AHU) were operating off of a common pneumatic air feed to the valve actuators. The pneumatic line developed an air leak […]
Cimetrics Senior Analysts presenting at the 2018 I2SL Annual Conference on Monday, October 15 2018.
Our Senior Analysts – Lisa Zagura and Julianne Rhoads will present: “BE A BTU HUNTER: How Big Data Analytics Can Achieve Energy and OM Savings While Improving Productivity, Comfort, and Sustainability at Laboratory Facilities”.
Simultaneous heating and cooling issue
In this example we will show you how Analytika service helped to solve simultaneous heating and cooling issue. The Air handler (AHU) discharge air temperature (DAT) setpoint was overridden from the sequence of operation and reduced from 55˚F to 51˚F. As a result, the cooling coil valve was opening to maintain the lower DAT and consequently requiring additional […]
Heat Recovery Performance Verification
Four (4) large air handling units (AHUs) in one of the buildings have heat recovery; however, only two (2) were operating efficiently. The heat recovery system supplies a 50% glycol solution to the four (4) heat recovery coils in AHU-1A, AHU-1B, AHU-1C, and AHU-1D. The system utilizes a single 100 HP constant flow pump which […]
The Leaking Preheat Valve Mystery
This leaking preheat valve case is unique. It is a rare issue due to the site location and the conditions under which it occurred, and it took time and collaboration to solve. It required both data analysis and field investigation to identify the fault and determine the root cause.