–Hitachi combined AC solution at Nippondaira Hotel (Japan) v2
Chiller and VRF installation
The place: 4-star hotel co-exists in harmony with nature near the legendary Mount Fuji
Nestled near the heart of Japan, the Nippondaira Hotel combines breathtaking natural scenery with world-class design. From a complete reconstruction in 2012, the hotel building reflects the hotel’s commitment to environmental preservation and reduction of carbon emissions.
The hotel building includes the following carbon-reduction features:
- All LED lighting
- No usage of fossil fuel
- Heat/Cool thermal trench around the building structure to reduce the heat demand
"Hitachi’s air conditioning system has enabled us to reduce a lot of our energy spending"
Mr. Noriyoshi Ikegaya, Executive Director of Administration, Director of Engineering, Nippondaira Hotel
Nippondaira Hotel earned the top rating ‘S class’ in the Japanese Comprehensive Assessment System for Built Environment Efficiency (CASBEE) — extremely rare for a hotel [1].
The solution: A combined installation of the Hitachi Scroll Chiller and heat recovery VRF create the perfect air for guests
To bring air conditioning to the hotel’s public spaces 24/7, all-year long, two sets of Inverter MATRIX chillers were installed. In particular, these were adapted to work in the hotel’s main public space—a large single zone with a 10m high ceiling and impressive glass walls. Free cooling technology is used to regulate the chiller operation, balancing its operation with any other thermal sources, such as the air from the thermal trench.
For the 80 guest rooms and restaurants, SET FREE system provides:
- Energy Efficiency — Allowing for precise modulating based on ambient temperature and the hotel’s occupancy level, reducing on-off cycles and unnecessary capacity.
- Heat Recovery — When one guestroom is cooled, excess heat is re-used to heat another if a guest has selected heating in their room.
- Low Noise Levels in Guestrooms — To eliminate noise, the CH-Box and expansion valves were installed remotely [2]. Indoor air inlets were placed as far as possible from the guest beds and relaxation areas.
“Hitachi VRF system realizes a level of quietness that makes you forget there is air conditioning at all!”
- Easy-to-use guests controls — To cater to the various languages of the hotel guests, wall-mounted controllers use universal functions and displays both °C and °F.
- Centralized Monitoring — Central Station permits the Hotel HVAC manager to monitor the system from their office. This allows the prevention of any overcooling or overheating, and enables the manager to switch off air conditioning in vacant guestrooms when needed.’
[1] http://www.city.shizuoka.jp/000137380.pdf
[2] Ducted indoor units without integrated expansion valves supplied on custom order.
Downloads:
Location
Shizuoka, Japan
Project
Construction of a high environmental performance hotel building (floor area: 6,153m2 / 7 storeys)
Date of installation
2012
Total System Capacity
3,660kW
Outdoor Units
Heat Recovery type Air source
Indoor Units
Guest Rooms: 111 x Ducted indoor units - Kitchens: 9 x Stainless steel units - Other Spaces : 25 x Ceiling cassette
