We specialise in energy efficient solutions suited for all types of buildings but are particularly well suited to retail environments. We have developed an integrated solution that optimises energy use – by linking the heat pump air conditioning to heat recovery ventilation, door curtain heaters, hot water and lighting systems. Then by using a sophisticated Modbus control system linked to Carbon Dioxide sensors, outdoor air temperature sensors and PIR’s we significantly reduce energy consumption of buildings where this solution is implemented.
These energy savings are achieved by the use of:
When the outside temperature is low enough to provide cooling, heat recovery is disabled and the rate of ventilation is increased.
When free cooling isn’t available, the rate of ventilation is optimised via CO2 control to minimise energy use (fan power and associated heating or cooling loads).
Heat recovery that absorbs heat by cooling one part of the building (typically retail premises require cooling all year round, to upper floors and internal areas away from open doors – due to the heat created by the lighting and people) and uses this heat for either hot water or to heat other areas where heating is required.
Curtain heaters are effective at reducing energy by forming a ‘barrier’, but the heat emitted is often inefficient electric element type. Energy associated with door curtains can be hugely reduced either by fitting heat pump (*1) type door curtains, or by linking the heating function to the nearby heat pump air conditioning systems and a local sensor. When the heat pump systems can cope with the heating requirements in the area, the inefficient electric heater elements within the door curtain heater are disabled, leaving just the fans running to maintain the ‘barrier’.
*1 – due to heat pump systems needing to have a defrost cycle, split type heat pumps are not ideal for demanding door heaters, if however they are part of a much larger heat recovery VRF system, or if an outdoor unit optimised for heating function is provided, or if a heat pump ‘wet’ system is provided – an energy efficient solution for heat pump door curtains is very viable. Heating provided by a heat pump system uses approximately one quarter of the energy of an electric element heater.
Outdoor sensors allows the time to switch on the HVAC systems to be optimised and the set points for the internal temperature adjusted to suit what people are likely to be wearing, along with their seasonal perception of comfort. By adjusting set points by a degree or 2, a significant saving is achieved.
Time switching with some clever programming, all the energy consuming equipment on a site is switched on and off at the optimal time through the controls system. Display lighting & signage lighting for example all have unique time scheduling requirements. We can also have 2 levels of lighting – the first level provides adequate light levels in shops for cleaning and for staff, which is then increased during trading hours of a shop to the full lighting level. All of these lighting functions, along with hot water, ventilation and so on, are all programmed according to the opening hours of a shop, along with any inherent delays required accounted for (CDMT lighting comes on 15 minutes early to allow for the ‘warming up’ period for example). Clocks going forwards and back for daylight savings are automatically taken into account and if for example a shop stays open later for the Christmas trading, it is only the opening and closing times that need to be reprogrammed – which we can do remotely via the web access.
By also linking lighting, HVAC and other energy consuming equipment within the building to the burglar alarm, everything that is not required to be operational when there is nobody in the building is switched off when the last person leaves and certain things are switched on when the first person arrives and sets the alarm.
As our entire control systems interface with the internet they can be remotely monitored. This means faults and energy use are also monitored and energy reports can be provided in an instant. In fact most of the retail stores that have our energy efficient solution fitted have almost no local control (other than emergency and service engineer overrides – which are also monitored) as it is simply not required.
Our design and management teams produce full detailed designs, provide CAD drawings and have worked on numerous projects that are subject to BREEAM and Lean Construction.