METI/ECCJ/AOTS Training Program

Indonesia

ESCO Project Example (city hotel)

1. Name of example ANA Hotel Tokyo Energy Conservation Retrofitting
2. ESCO Yamatake Building System Co., Ltd.
3. Facility overview

Contract demand	3,600 kW	Receiving voltage	22 kV
Number of stories	Three stories below ground and 37 stories above ground	Air-conditioning facility	District heating and cooling (chilled water and steam)
Total floor area	98,000 m²	Air-conditioning scheme	Central air conditioning, fan coil unit and packaged air conditioner

4. Energy conservation techniques

Air conditioner inverter control	Inverter control of air conditioner fan according to room thermal load
CO concentration control of parking area ventilation	Inverter control of parking area exhaust fans according to CO² concentration
Fresh air intake control based on CO² concentration	Control of fresh air intake according to indoor CO² concentration
Introduction of heat-insulating film	Covering of exterior windows of guests' rooms with heat-insulating film to reduce thermal load component attributable to outside air
Introduction of BEMS	Energy conservation through optimization of operating hours of facilities and equipment and thermal/humidity environment according to load conditions

(ESCO 2004-8)

ESCO Project Example (city hotel) cont'd

5. Finance Self-financing
6. Utilization of assistance measures
High-Efficiency Housing/Building Energy System Introduction Promotion Program
7. Type of contract and contract duration
Guaranteed-savings, three years
8. Owner benefits - sales points
Although the hotel is open for business twenty-four hours a day all year round, the air-conditioning load fluctuates from season to season and hour to hour. In this regard, the project will make it possible to optimize the operation of the air-conditioning system by automatically changing its output according to load conditions, thus eliminating energy wastage, and this is its greatest benefit.
9. Client's comments
The introduction of the energy conservation system has been delivering the expected energy savings. In fact, BEMS-based energy data analysis has brought about an even higher energy efficiency by inducing more energy-conscious building operation.
10. Problems encountered at time of introduction and solution measures
As the project was implemented while maintaining normal business activities, close consultations were held in advance regarding the equipment delivery schedule, working hours, etc.

ESCO Project Example (city hotel) cont'd

11. Energy conservation equipment used

ESCO Project Example (city hotel) cont'd

12. Energy savings achieved
Energy consumption before ESCO project 388,669 GJ/year
Energy consumption after ESCO project 307,921 GJ/year
Reduction in energy consumption 80,748 GJ/year (20.8% reduction)

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