Case Studies AQA, Stag Hill House,
University Campus, Surrey

Design and installed Daikin VRV air conditioning systems throughout a large majority of the building. The building consists of four floors, each floor having VRV systems installed. A total of 20 VRV systems are currently in operation. The systems are made up of a combination of two pipe heat pump and three pipe heat recovery, combined with fresh air using the Daikin Vam heat exchanger fresh air units.

Indoor units used are mainly the ducted concealed type, these are positioned within the false ceiling void, these are serving supply air grilles and return air grilles, positioned throughout each floor to suit the office layout, these are connected with spiral ductwork. All office areas have individual control via wall mounted remote controllers, because the system is on 24 hour time clock control, remote control operation allows the user to adjust fan speed and temperature only.

All systems are operated via centralised control, this allows the user to monitor and change temperature, to alter temperature in different areas, to change on / off times, to monitor fault modes.

The VRV system could be connected to the existing building management system if required. A number of smaller single split systems have also been installed throughout the building. These areas are normally where there has been no form of cooling or heating in the past and before the VRV systems were introduced to the building.

The building houses a number of small IT rooms, these are provided with cooling only split systems these have been installed and modified over the years as more equipment has been introduced.

GDK currently maintain all air conditioning and ventilation systems throughout the building. The equipment is maintained on a quarterly basis, this covers Daikin equipment within the manufacturers' warranty, equipment outside warranty and equipment installed within the building when it was being built.

D.T.I. Victoria

Application:
Cooling and heating to virtual reality 3D Cinema and Training Facility.

Concept:
To provide a quiet and comfortable environment to operators and audience.

Installation:
The area is served by an air handling plant for fresh air and chilled water fan coils, supplying conditioned air to individual areas. The fresh air plant is equipped with pre-heaters used to temper the air at ambient temperatures below 5ºC. A cooling coil maintains a fresh air temperature of 21ºC. A package Hitachi chiller feed both the fresh air unit cooling coils and the individual room fan coils.

The individual fan coils are located above the ceiling with the air received through insulated ducting to grilles located in either the ceiling or walls. Temperature is constantly monitored using sensors, which in turn control the operation of various valves and dampers to maintain a stable temperature. A centralised control panel is located in the main plant room.

Tasks carried out by G.D.K. Ltd.

1. Project manage the installation.
2. Sourcing and supplying equipment and materials.
3. Employing labour to carry out installation.
4. Health and Safety enforcement on site.
5. Liasing with clients representative.
6. Commissioning of completed installation.
7. Providing operating and maintenance manuals.
8. Site instruction to end user.
9. Providing on site preventative maintenance contract.