Coliseum Retail ParkInnovative thinking reduces energy and installation costs in new, sustainable retail premises
The Client:
Top UK Clothing Retailer
Requirements:
Our client approached us to develop innovative ideas for energy saving to help reduce their environmental impact.
The Solutions:
- A Rainwater Eco System
- Three Pipe Heat Recovery to replace Electric Door Curtains
- Utilise Fresh Air to cool store when available
Rainwater Eco System
Our first idea was to utilise rainwater.
- We designed, fabricated and installed a bespoke rainwater harvesting system to meet the British Safety standards 8515:2009
- There is a 5000 litre external tank fitted to the rear of the building at ground level on a load bearing base which collects rainwater from a diverted rainwater pipe and then fills up the tank. Any excess water discharges back into the main drain.
- A pressure sensitive submersible pump and a sophisticated control system provides water to an internal break tank located at a high level within the premises
- This enables `Grey Water`, to be distributed throughout the building to serve all of the flushing sanitary appliances. The system supplies up to 1250 flushes worth of stored water.
Three Pipe Heat Recovery system to replace Electric Door Curtain Heaters
We developed a system that would utilise heat energy normally rejected to outside air
- Ducted units were installed to a common ‘simultaneous heating + cooling’ system that connected to fan coil units both at the rear of the store and adjacent to the front doors.
- Electronic damper systems were utilised to control the airflow adjacent to the front door – in heating mode, the air discharges vertically at high velocity to achieve a ‘curtain’ effect, but then in cooling mode, dampers divert a significant proportion of the air to ceiling mounted diffuser grilles positioned further into the shop.
- An energy control system was installed to adjust fan speeds and operate the electronic volume control dampers to suit the conditions of the shop and operation mode of the system.
The Result
- The configuration resulted in there being no requirement for additional electric door curtain heaters and unlike other heat pump air curtains (that are expensive and can only heat), the summer cooling capability and grille configuration meant that it was only the number and capacity of AC Units needed for cooling, that were required to be installed.
- The surplus heat at the rear of the store is collected (by the cooling function of the associated AC units) and is then used to heat the front of the store where the entrance door creates a heating requirement. Both the heating function at the front door and the cooling function at the rear of the store are achieved using the same refrigeration circuit, resulting in a very significant saving in running cost.
- The control system ensures that the heating will work only when the ambient temperatures and internal shop conditions warrant it.
- Efficient cooling and heating, as the only power consumed is by the inverter heat pump system that has a very high energy efficiency ratio.
- A bespoke, oversized air handling unit was selected to utilise more than ‘minimum’ levels of ventilation, to provide `free cooling` whenever available (which is for a significant proportion of the time in a retail environment due to the high amount of lighting).
- The system controls the amount of air going into the shop by monitoring and inverter controlling the fan speeds via CO2 monitoring and associated controls.
- A heat recuperator within the AHU minimises the amount of heating (or cooling) lost to outside through ventilation by using a heat exchanger that uses exhaust side of the system to pre-heat / pre-cool the incoming fresh air.
- When the outdoor temperature is cooler than the internal set point and cooling is required, the system stops using CO2 to control the amount of ventilation and instead regulates the amount of fresh air to provide cooling. The heat recuperator is modulated out of circuit by a bypass damper that allows fresh air at lower temperatures and at a higher rate to be supplied straight into the shop.
- Energy is saved by reducing the requirement to cool the store by means of DX air conditioning, and the additional fresh air provides a higher quality retail environment.
 |
State of the art Business School for Brunel University |
|
 |
||
| more» | ||
 |
MASDAR Institute of Science and Technology |
|
|
||
| more» | ||
 |
Coliseum Retail Park |
|
| more» | ||
 |
Thistle Kensington Hotel |
|
| more» | ||
|
Samworth Academy Leicester |
|
| more» | ||
|
Novotel – Paddington |
|
| more» | ||
