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Home » Applications » AC Drives on hotel air conditioning fans
AC Drives on hotel air conditioning fans
Hotel saves energy and improves comfort
A major Perth hotel installed AC drives on its air conditioning fans, improving conditions, reducing noise and cutting fan-related energy costs by about 40%.
Project description
The hotel has a large number of units supplying air conditioning to the guest rooms. As more rooms are occupied, more air is needed to maintain a comfortable temperature in each room. As a result, the fans supplying the air need to vary their output, based on the number of occupied rooms at any given time.
The initial installation had throttling dampers installed in the supply air ductwork. As the requirement for airflow decreased, these dampers closed to reduce airflow to the rooms.
Not only was this method of flow control inefficient in terms of energy use, it was noisy and required regular maintenance.
The hotel determined that installing AC drives on the fans would save energy, improve system performance and lower maintenance costs.
After a trial run, the hotel installed AC drives on each of the guests' rooms supply air fans. The work included disconnecting the existing supply air dampers, upgrading the air conditioning control systems and installing the new AC drives.
Savings achieved were around 40% of fan energy costs. This equated to approximately $23,000 per annum. A typical result (for one fan) is shown in the figure below.
Figure 1: Before and after installation
Based on the monitored results the initial payback period will be 36 months. This does not include the maintenance savings.
This case demonstrates that it is possible to improve energy performance and service delivery at the same time. The upgrade was very well received by both hotel management and their guests.
Summary
Note: Whilst care has been taken in the preparation of this material, it is intended to provide a general idea about what can be achieved in a particular situation. Quantitative indicators may vary with time and changing circumstances. Each situation is different, requiring its own evaluation; and therefore the results given above should not be taken as being directly transferable to other circumstances. Names and addresses have been withheld for privacy reasons.
A major Perth hotel installed AC drives on its air conditioning fans, improving conditions, reducing noise and cutting fan-related energy costs by about 40%.
Project description
The hotel has a large number of units supplying air conditioning to the guest rooms. As more rooms are occupied, more air is needed to maintain a comfortable temperature in each room. As a result, the fans supplying the air need to vary their output, based on the number of occupied rooms at any given time.
The initial installation had throttling dampers installed in the supply air ductwork. As the requirement for airflow decreased, these dampers closed to reduce airflow to the rooms.
Not only was this method of flow control inefficient in terms of energy use, it was noisy and required regular maintenance.
The hotel determined that installing AC drives on the fans would save energy, improve system performance and lower maintenance costs.
After a trial run, the hotel installed AC drives on each of the guests' rooms supply air fans. The work included disconnecting the existing supply air dampers, upgrading the air conditioning control systems and installing the new AC drives.
Savings achieved were around 40% of fan energy costs. This equated to approximately $23,000 per annum. A typical result (for one fan) is shown in the figure below.
Figure 1: Before and after installation
Based on the monitored results the initial payback period will be 36 months. This does not include the maintenance savings.
This case demonstrates that it is possible to improve energy performance and service delivery at the same time. The upgrade was very well received by both hotel management and their guests.
Summary
|
Efficiency measure(s) |
Installation of AC drives on fans |
|
Potential users |
Offices, hotels, hospitals, schools |
|
Site |
Hotel in Perth. |
|
Cost of implementation |
$67,000 |
|
Expected payback period |
36 months |
Note: Whilst care has been taken in the preparation of this material, it is intended to provide a general idea about what can be achieved in a particular situation. Quantitative indicators may vary with time and changing circumstances. Each situation is different, requiring its own evaluation; and therefore the results given above should not be taken as being directly transferable to other circumstances. Names and addresses have been withheld for privacy reasons.
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