What is a District Energy Sharing System (DESS)?
The DESS is a high efficiency energy delivery system that replaces traditional furnaces, air conditioners and boilers in homes and buildings. This centralized system distributes and shares heating and cooling energy between buildings throughout the entire neighbourhood.
The first stage of the District Energy Sharing System uses a geoexchange field as its main renewable energy source. Geoexchange harnesses the shallow geothermal energy below the earth’s surface. In the winter, a geoexchange system draws heat from the ground for heating, and in the summer, it uses the ground to reject excess heat to provide cooling.
The DESS is a highly flexible system, capable of incorporating the latest innovations in renewable energy technology.
District energy systems are operated all over the world, including right in our own backyard! In Edmonton, the University of Alberta owns and operates a district energy system to serve their greater campus area. In Canada, a number of other cities, towns and neighbourhoods are using district energy sharing systems, including Whistler, Vancouver, Richmond, Langford and Surrey in British Columbia, as well as Toronto, Ontario. If we look even further to Europe, cities like Copenhagen have historically built systems where over 90% of the buildings are connected to a district energy system.
Certified solar-ready trusses on peaked roofs enables the future installation of solar panels.
To reduce energy loss and to increase the airtightness in the home, windows must meet a high standard for energy-efficiency. Windows in Blatchford homes have a very low thermal transmittance value, which means they prevent heat loss to the outdoors better than a window that just meets the requirements outlined in the Alberta Building Code. Better windows mean residents will be more comfortable during the winter months, as the windows will reduce drafts and not radiate cold as much as a standard window.
Buildings in Blatchford have highly insulated walls, roofs AND basement floors because a well insulated home is the key to energy efficiency! Insulation reduces the amount of energy needed for heating and cooling and keeps the home at a comfortable temperature year round. Added bonus - insulation is also helpful for reducing outdoor noise pollution.
All major appliances will be Energy Star® rated to minimize energy used in the home.
Instead of using furnaces and air conditioners that rely on burning fossil fuels, Blatchford buildings will use heat pumps that rely on transferring energy. Heat pumps are the most efficient mechanical system for heating and cooling. A home heat pump produces 400% more energy than the electricity it consumes! In comparison, a traditional high-efficiency furnace operates at around 90% efficiency. The heat pumps are connected to the community’s District Energy Sharing System, which uses renewable energy sources including geoexchange and solar.
Homeowners will be able to minimize their energy use with advanced heating controls. Depending on what model the home builder chooses, these smart room thermostats can be programmable, self-adjusting, have occupancy detection and more.
Airtightness refers to how much air flows into and out of a building in areas that shouldn’t have air flow, such as your walls and around your window frames. The more airtight a building is, the better. The building will lose less heat, its ventilation system will be able to perform better, there will be less chance of unwanted moisture entering the home, and residents will have higher comfort (fewer temperature and humidity control issues). All Blatchford homes undergo a blower door test to confirm a level of airtightness which exceeds the minimum code required in new home construction.
Located in a home’s duct system, heat recovery ventilators help reduce pollutants and odours by replacing stale air with fresh warm air. HRVs also use the warm air that would normally be exhausted (vented) from your home to preheat incoming cold air to save energy. HRV systems that recover a minimum of 80% of the heat from exhaust air have been selected for Blatchford homes to reduce the energy required to heat the incoming fresh air.
Homeowners will have added peace of mind as air filtration systems reduce indoor pollutants.
Low-flow and water-efficient fixtures and appliances, like faucets, toilets, showerheads, dishwashers and washing machines, allow homeowners to reduce their water consumption.
Blatchford homes will be some of the greenest in Canada. Homes will have features like increased insulation, smart room thermostats, energy- and water-efficient appliances, low-flow fixtures, high-quality windows, and a tighter building envelope to reduce heat loss.
For homeowners, this means a better built building – less energy and water usage, healthier indoor air quality, more durable construction, and contributing to a healthier planet.
Buildings in Blatchford will reflect the ambitious goals for sustainability and energy conservation. By following the community’s building code requirements, homes being built are up to 37% more energy efficient than required by the current Alberta building code.
Blatchford has created green building codes that all our home builder partners follow. These codes ensure the building features that provide the most value to the homeowners are built in all the homes.
The codes are built around 3 principles:
Buildings in Blatchford will have highly insulated walls, roofs and floors, high-performance windows and an airtight envelope to reduce heat loss.
Building energy systems will actively recapture any waste heat and efficiently consume energy through the use of heat recovery ventilators, sealed ductwork and variable speed pumps. Homeowners will be able to minimize their energy use with advanced heating controls.
SUSTAINABLE BUILDING FEATURES
The buildings will also feature water-efficient fixtures, water and energy efficient appliances and air filtration systems. Construction practices will reduce waste materials and air pollutants which can remain in the finished buildings.