RemoteHVAC
Topic:
Heat Stratification, Hunting, Heat Recovery and Damper Failure Case studies.
Submission:
Heat Stratification – Case Study 1
Synopsis:
The RemoteHVAC software identified a Heat Stratification Fault on two AHU, which provide critical conditioning for a grocery area in a large retail store.
Problem:
Thermal or Heat stratification occurs when cool dense air sinks and warmer less-dense air rises. This natural process create layers of air with a gradient of temperatures.
Solution:
- Automated detection using RemoteHVAC software.
- Brief survey to validate temperature readings
- Destratification fans to be installed.
Result:
- Avoidance of annual gas wastage of €36,000
- Decreased wear and tear on components.
- Improved comfort in environment.
Hunting – Case Study 2
Synopsis:
The RemoteHVAC software identified a classic case of Supply Temperature Hunting on a packaged rooftop AHU, with DX cooling and two stage gas burners.
Problem:
Hunting is a common and difficult issue to detect in HVAC systems. The Air Handling Unit becomes ineffective as it oscillates about a setpoint trying to find equilibrium.
Solution:
- Automated detection using RemoteHVAC software.
- Onsite meters surveyed to validate electricity and gas wastage.
- Control Strategy to be tuned by BMS engineers.
Result:
- Avoidance of annual gas and electricity wastage of €8000
- Significantly reduced component wear and tear from rapid cycling.
- Increased comfort from draught effects of low supply air.
Heat Recovery – Case Study 3
Synopsis:
The RemoteHVAC software identified Inefficient Use of Heat Recovery on an air handling unit servicing the kitchen/canteen of a large commercial office building.
Problem:
The AHU was operating a pre-heat frost coil in warm outdoor air conditions which led to a limiting effect on the effectiveness of the available heat recovery system.
Solution:
- Automated detection using RemoteHVAC software.
- Resolution information sent to onsite engineering team.
- Corrective action taken by onsite team.
Result:
- Reduced the kWh running cost of the air handling unit by 19%
- Increased the use of heat recovery in air handling unit by 430%.
- Reduced heating demand on the primary boiler.
Damper Failure – Case Study 4
Synopsis:
The RemoteHVAC software identified a Damper Failure Fault leading to an extreme case of overheating in a packaged rooftop AHU, with DX cooling and two stage gas burners.
Problem:
Dampers on the AHU were found to be stuck in a closed position preventing normal airflow volumes through the unit, causing a spike in Supply Air Temperature to dangerous levels.
Solution:
Automated detection using RemoteHVAC software.
Resolution information sent to contracted maintenance provider.
Fix implemented by promptly by maintenance provider.
Result:
Avoidance of annual gas and electricity wastage of €18,000
onsite engineering team.
Avoided a costly replacement of AHU due to catastrophic failure.
Reduced resolution time for maintenance provider.
See Tonys slides by clicking below.