lecture_22_WEEK13 - Energy Systems in a Sustainable World...

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Energy Systems in a Sustainable World Reducing expenses in heating and cooling Dr. Francesco Ciucci Assistant Professor Mechanical and Aerospace Engineering Chemical and Biomolecular Engineering 1 Francesco Ciucci
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Why are we here? We have seen that energy systems strongly affect global warming To avoid global warming we need to go to 0 Carbon technology & we need to do it now !!! How can we address the problem rationally ? Compute energy expenses (how can we reduce them?) Compute energy resources (which are are better?) Compute land usage (is there enough land?) Francesco CIUCCI 2 Act Now! Why? Because we want to select sustainable and impactful technologies!
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Course Structure Motivation 1. Environmental impact 2. Dwindling resources 3. Energy security Expenses Resources make decisions and sustain a discussion on energy Reduce expenses & boost resources (how? EROI & costs ) Reduce Expenses! Francesco CIUCCI 3
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Balance Sheet Consumption Transportation Heating and cooling Lighting Manufacturing Food Information systems and other gadgets Sustainable Resources Wind Solar (photovoltaic, thermal, biomass) Hydroelectric Wave Tide Geothermal (Nuclear????) Francesco CIUCCI 4 195 kWh/day/person 178 kWh/day/person REDUCE BIGGEST EXPENSES!!! (heating & cooling)
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Important conclusions from our estimates Francesco Ciucci 5 3 rd biggest piece after: - Transportation (Travel less or in a “smarter” way) - Manufacturing (consume less) is heating and cooling !
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Heating How can we quantify energy-savings that can be achieved by improving heating technology or by lifestyle changes? Francesco Ciucci 6 Rate at which heat flows out of the building leakiness of building (= heat loss coefficient of the building) Note that we could apply the same principles for cooling! = average temperature difference × leakiness of building
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Heating (cont’d) Average temperature difference between the inside and outside of the building depends on thermostat setting and on weather ( Δ T is measured in o C) Leakiness indicates how much heat gets out through walls, windows, and cracks, in response to a temperature difference (Leakiness is measured in kWh/day/ o C) Francesco Ciucci 7
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