Case Studies

Night Hawks case studies.

Free Cooling and Improved Thermal Comfort

Over recent years, Central Stores in the UK has implemented many energy saving measures in recent years and realised real savings of many thousands of Euros per annum. An on-going issue in the store is the excess heat given off by the refrigeration equipment, cooking facilities, lighting and cash machine. The site has no need of a heating system, but had been using three air conditioning units to try and keep the store cool for staff and customers – throughout the year, in the UK!

View page

Heat Recovery from Refrigerated Counters and Frozen Food Merchandiser

The supermarket ICA Maxi Olofström in Sweden reduced all their usage of oil for heating purposes by recovering heat from the cooling machines which are providing the cooling needed for food in the store. When a new cooling system was installed, a test was made to recover heat generated by the cooling machines and reuse it in the store. This proved to be sufficient enough, and so the oil boiler could be removed. Previously 25,000 litres of oil was used for heating, and nowadays there is no oil consumption for heating purposes at all. The carbon dioxide emissions have consequently been reduced by 69 tons annually.

View page

Installation of Free PhotoVoltaics (PV) on Shopping Centre

Management at The Staunton Garden Centre in the UK are keen to reduce their energy costs and environmental impact. Having already installed a variety of energy efficiency measures at the centre, the next step was naturally to look at onsite electricity generation.

View page

Installation of 175kw PhotoVoltaics (PV)

The supermarket Coop Karlshamn in Sweden has invested in an ecological profile which includes a large PV-plant on top of the flat roof which produces electricity from the sun. The PV plant is the largest PV-project within the Swedish chain COOP.

View page

Measuring Temperatures and Nightly Turn Off of Coolers and Freezers

The large supermarket COOP Forum Karlshamn in Sweden are using nine plug-in coolers for soft drinks in the section for drinks. Some of them have glass doors and some of them are open during the day-time. All coolers are running every day and night, all year round and nobody is keeping an eye on the temperature level.

View page

Nightly Turn Off of Coolers and Freezers

DagliBrugsen, Maarup in Denmark (Samso) is achieving 725€/year from switching off plug-in coolers for non-perishable goods overnight.

View page

Energy Savings from Energy Awareness Training

In Kingsholm, home to Gloucester Rugby in the UK. Multiple out-of-hours energy surveys were conducted of the site. The results of these combined with the results of energy analysis of two years’ worth of energy data, showed there was high out-of-hours energy use. It was evident that equipment was being left on unnecessarily.

View page

Importance of Checking Existing Building Management Systems (BMS )

As part of a survey of Juglas Centrs in Latvia. The operational settings of Building Management System were investigated and it was found out that many parameters of the system were not set properly.

View page

Building Management System (BMS )

In the Courier Shopping Mall in France a Building Management System (BMS) has been installed to control and monitor in real time all the equipment of the building (heating, cooling, lighting, doors, safety equipment, etc.).

View page

Installation of Motion Sensors in Storage Area

The supermarket Willys in Olofström, Sweden is expanding to become 50% larger. The merchant Roland Nilsson says that they are working hard to be aware of the energy consumption and they have done some energy investments in order to reduce the usage.

View page

Replacement of lighting system by LEDs

Auto Zentrum Rausch is a car dealership in Germany. 38% of the total energy consumption is electricity. The biggest part is the lighting system with 70% of the consumption and it is the only continuous consumer in whole car centre. The lighting was then replaced with LEDs.

View page

Replacing Halogens with LEDs

Electrofix is a small music equipment repair shop in Bristol. The site consists of a shop front, a workshop and unheated store area. An energy assessor completed a brief energy survey of the business and identified that over 75% of the business’s total energy spend was due to the electricity use of the halogen spot lighting.

View page

Concept of Passive House as Commercial Building

The new commercial building as a passive house was designed in 2008. It is the first passive house in Saxony, which is used exclusively as a commercial building.

View page

Thermal Coating of Metallic Window Frames

The need for insulating metallic window frames is due to the ability of the metal to absorb and transmit heat. The insulation of the frame is useful for the reduction of heat transfer. Coloring the insulating material with white/bright colours is also useful to minimize heat absorption.

View page

Passive House as Commercial Building

A commercial building was designed in Minergie P label and built in 2012. It is the first Minergie labelled shopping mall in Haute-Savoie, which is used exclusively as a commercial building.

View page

Using Internet connected sensors to document savings

The sensors send temperature and humidity to the Web and the smartphone. Graphs document the saving actions.

View page

Using a Smart Meter to Promote Savings

A Smart Meter shows the electricity consumption on the Web or on a smartphone.

View page

Concept of passive house as a commercial building

The aim was to achieve optimal economic and ecological conditions by using renewable energy sources and special insulation at level of passive house standard. It is a comprehensive approach were the quality of the thermal envelope, ventilation, heating, cooling and electricity production serves the high standard of passive house.

View page

Replacement of lighting system by LED

Manager Matthias Rausch wants to improve the energy efficiency of the lighting system and wants to save energy costs. Therefore he starts planning a new lighting system by exchange T8 fluorescent tubes with LED technology in all rooms.

View page

Installation of motion sensors in storage area

The supermarket Willys in Olofström is expanding to become 50% larger. The merchant Roland Nilsson says that they are working hard to be aware of the energy consumption and they have done some energy investments in order to reduce the usage.

View page

Installation of 175 kW PhotoVoltaics

The supermarket Coop Karlshamn has invested in an ecological profile which includes a large PV-plant on top of the flat roof which produces electricity from the sun. The PV plant is the largest PV-project within the Swedish chain COOP. "It just happened by in coincidence" says Conny Berg, managing director of COOP Karlshamn referring to the huge PV plant, he has installed at the supermarket COOP Forum. Basically, it is his personal interest in going green that made it possible and has been the force to accomplish the investment.

View page

Heat from Refrigeration produces savings of 35,000 Euros!

Many store-keepers see energy costs as something they have to endure and can do nothing about, but there is a great deal of money to save by checking up on energy use.

View page

The investment is very low and the payback-time is less than a week

“We save 1,200 euro per year (12 000 Swedish kronor/year) by nightly turn off of our plug-in coolers and this with a very short pay-off”, COOP Forum merchant Conny Berg says.

View page

Regent Arcade Shopping Centre, Cheltenham, UK

The Cotswold's premier shopping centre based in the heart of Cheltenham contains more than 60 stores, 7 restaurants and has parking for more than 500 vehicles. The centre received the Green Apple award in 2013 for its work in energy efficiency and has since joined the Night Hawks programme to continue achieving savings. During the winter of 2014 a series of out of hours energy surveys was conducted at Regent Arcade in Cheltenham from which measures were identified that could make further cost savings of more than 25%.

View page

22% Savings at Gloucester Rugby

Gloucester Rugby is a premiership rugby team in England with a 16,500 seater world cup standard stadium in Kingsholm. The stadium also consists of a shop, general offices, food outlets, bars and hospitality suites. Having already cut their water usage substantially generating an £8,000 a year saving. The organisation contacted Severn Wye to help look at their energy use in mid to late 2013.

View page

20% savings at Central Stores, Forest of Dean, UK

Central Stores is a convenience store and sub-post office in Lydbrook.  The business was initially surveyed in 2008 and had a follow-up survey completed in 2012. The total annual energy spend in 2013 was approximately £14,000—emitting 67 tonnes of CO2, the equivalent to that emitted from 11 homes in the UK.

View page

12% Savings from Monitoring Heating Temperatures

In order to follow up on our energy saving actions, we installed five temperature sensors in the Community Centre in Tranebjerg on the Danish island Samso. The sensors are connected to the Internet. We can check the current temperature and humidity anytime and anywhere. At this site we have collected measurements over six months.

View page

Electric Hand Dryers Make Savings

Savings do not always come from using less. Severn Wye Energy Agency have just installed equipment that will increase electricity consumption, but results in reduced Waste, Cost and Carbon Emissions. It was decided to look at the overall impact of the paper hand towels that are used at our Highnam office in terms of waste, cost and carbon. The first two were relatively easy to calculate. The hand towels cost £330 to £380 to purchase a year and create around 50 bags of physical waste.

View page