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Diurnal (daily variation) storage can take the form of large water tanks used to balance peaks and troughs in daily supply variations. Where sources vary seasonally it is possible to store low temperature heat for several months using aquifer thermal energy storage (ATES). Alternative network system designs As noted, the cost and carbon involved in upgrading low temperature sources of heat to match demand needs can be significant. Alternative network system designs are being developed, particularly in Canada, that seek to utilise and balance heating and cooling demands between buildings using very low temperature networks. These are known as District Energy Sharing Systems (DESS). A DESS utilises a warm and cool pipe to share low grade thermal energy between buildings. Each building has a heat pump (which can be reversible) to provide heating (or cooling) at the required temperature. The system is based on a low temperature un-insulated distribution system that draws energy from diversified sources. Two pipes connect various loads and sources through distributed heat pumps. These provide heating to connected buildings by drawing heat from the DESS ‘warm pipe’. The same heat pump can be used to cool the buildings in this case rejecting heat back into the ‘warm pipe’. Buildings in heating mode pull their heat from a ‘warm pipe’ (10°C to 20°C) and dump their cool water into a ‘cool pipe’ (5°C to 15°C). This type of system works particularly well in areas with a mix of heating and cooling loads such as residential and offices or retail. It is suited to low temperate heat sources and could be introduced into schemes where buildings and building layouts are suitable. A schematic showing an overview of this concept is given in Figure 12. Figure 12 – Overview of the concept for a District Energy Sharing System (DESS) © DEC Engineering 25PDF Image | LONDONS ZERO CARBON ENERGY RESOURCE Secondary Heat
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