basics:passive_house_-_assuring_a_sustainable_energy_supply:passive_house_the_next_decade
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basics:passive_house_-_assuring_a_sustainable_energy_supply:passive_house_the_next_decade [2015/03/27 18:11] – jbreitfeld | basics:passive_house_-_assuring_a_sustainable_energy_supply:passive_house_the_next_decade [2020/09/14 00:30] – alang | ||
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====== Passive House – the next decade ====== | ====== Passive House – the next decade ====== | ||
- | ===== Focus – basis of efficiency criteria | + | ===== Efficiency Criteria |
Major changes in the energy supply structure over the next few years will lead to constantly changing primary energy factors. For that reason alone, the frequently used nonrenewable primary energy demand will no longer be suitable for assessing buildings' | Major changes in the energy supply structure over the next few years will lead to constantly changing primary energy factors. For that reason alone, the frequently used nonrenewable primary energy demand will no longer be suitable for assessing buildings' | ||
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* A **short and mid-term grid storage structure** consisting of conventional storage devices throughout the grid with low conversion losses (2 to 35 percent) and more than 60 storage cycles per year. Some options include pumped storage plants, other mechanical storage systems, and batteries. The applications themselves also have storage capacities, like hot water tanks and heat capacity in buildings (a temperature difference of 1 K is considered acceptable and results in storage losses of about ten percent). A quick calculation shows that all of these systems are far from suitable for long-term storage (less than five cycles per year), even if costs drop significantly | * A **short and mid-term grid storage structure** consisting of conventional storage devices throughout the grid with low conversion losses (2 to 35 percent) and more than 60 storage cycles per year. Some options include pumped storage plants, other mechanical storage systems, and batteries. The applications themselves also have storage capacities, like hot water tanks and heat capacity in buildings (a temperature difference of 1 K is considered acceptable and results in storage losses of about ten percent). A quick calculation shows that all of these systems are far from suitable for long-term storage (less than five cycles per year), even if costs drop significantly | ||
- | * **Seasonal / long-term storage.** Exergetic storage systems are not available because of high costs and low energy density. Instead, converting energy into easily stored fuels is a good solution – for example, water electrolysis and hydrogen production, potentially as intermediate storage (conversion utilisation rate of up to 63 percent), or conversion into synthetic methane (3 H< | + | * **Seasonal / long-term storage.** Exergetic storage systems are not available because of high costs and low energy density. Instead, converting energy into easily stored fuels is a good solution – for example, water electrolysis and hydrogen production, potentially as intermediate storage (conversion utilisation rate of up to 63 percent), or conversion into synthetic methane (3 H< |
* The second issue in point 3 (low power density) results from the resources – in this case, the amount of space – that renewable structures require. These resource requirements are fundamentally different from those of fossil energy, where resource consumption is irreversible (hydrocarbon consumed) and product disposal leads to permanent pollution (CO< | * The second issue in point 3 (low power density) results from the resources – in this case, the amount of space – that renewable structures require. These resource requirements are fundamentally different from those of fossil energy, where resource consumption is irreversible (hydrocarbon consumed) and product disposal leads to permanent pollution (CO< |
basics/passive_house_-_assuring_a_sustainable_energy_supply/passive_house_the_next_decade.txt · Last modified: 2024/04/18 22:30 by jgrovesmith