Week 1-2 Flashcards
Systems thinking
A way of thinking about, and a language for describing and understanding, the forces and interrelationships that shape the behavior of systems.
Energy
o Total volume or stock of energy available to do work
o Volume concept, denominated in Joules, Kwh
o Energy = Power * Time
o It’s energy if you can burn it
o Non-renewable resources are stock-limited
Power
o Transformation of energy, rate of flow in the system
o Power = Energy/ Time
o MW, Joules/Second
o Device/ thing that transforms energy in power, e.g. engine, pipeline, NG well,
LNG terminal
o Renewable resources are flow-limited
1st law of thermodynamics
law of conservation of energy, ins & outs must be the same in the end
2nd law of thermodynamics
: “entropy” (Infogehalt) increases, energy flows form hot to col, losses accumulate
• As we transform energy, we occur losses. Only useful energy is lost, total energy cannot be lost (1st law)
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Systems
consist of stocks, flows and feedback loops (Rückkopplung)
Feedback loop
o Communication mechanism btw stocks & flows, taking in data about the state of the system
o We transform energy, by incurring costs, to increase it in value (to do useful work). Ideally, you have to increase the value so much that the costs are less than the value, that’s called a feedback loop.
o Stabilizing and goal seeking: system that detects when stocks are too low, causes increases in inflows or decreases in outflows
o Reinforcing and runaway: causes a system that is out of balance to go further in that direction (positive feedback)
o Feedback loops only affect future behavior
In physical, exponentially growing systems, there must be at least 1 reinforcing loop driving the growth and at least 1 balancing loop constraining the growth, cause no physical system can grow forever.
• Capital that matters in the energy system
o Human capital (labor)
o Financial capital
o Physical capital (infrastructure and all that goes along with it)
o Intellectual capital (knowledge and technology needed to innovate and create)
o Political (regulation, permits)
o Natural (energy resources, water, land, raw materials)
Total energy use (E)
E= P * E/P
Energy use per capita (E/P)
E= P* GDP/P * E/GDP
-> energy use per unit of income
Energy Intensity
E/GDP
Productivity of energy
GDP/E
Stocks
o Foundation of any system, you can see, feel, count or measure at any given time
o Stocks change overtime through the actions of a flow (1st derivative)
o Stocks change slowly because flows take time to flow
o A stock can be increased by decreasing its outflow rate, as well as by increasing its inflow rate
Flows
Infrastructure of the energy system. Actions/devices that change energy over time
Usually expressed as rate (Electricity/hour)
Stabilizing/ goal seeking loop
keeps things in certain range (negative feedback)
Reinforcing / runaway loop
pushes things to extremes (positive feedback)
System purposes
Need not be human purposes and are not necessarily those intended by any single actor within the system
• Resource Limits/constraints in the E system
o Oil stocks and reserves are unevenly distributed (highest in middle east) + not enough res.
• Energy security issues (the oil trade makes us dependent)
o All Coal is local + not enough atmosphere
• Its less mobile than liquid or gas fuels
o Natural gas reserves are concentrated + not enough resources
o Hydropower resources (best in mountains) + not enough sites
o Wind resources + not enough sites
• Location dependent (good on the coasts and in the upper plains)
o Biomass resources (location dependent- good in the upper mid-west) + Hydrogen is not a “source”, requires energy to produce it
o Geothermal potential: (better on west coast)
o Solar Resources- best in SW of US
• Ratio of useable solar to our energy needs: 7,000:1
o Fuel prices are rising and becoming more volatile (inconsistent)
Value
o Value- Surplus = Price = Costs + Profits
o amount of benefit that the customer receives from the purchase or use of of a good/service. It is the highest at final consumption.
Surplus
o what I am willing to pay over what the price is
Fungible goods
Goods are only fungible if they are identical in
o WHAT - Type and Quality (wholesale vs. residential prices)
o WHERE – Location (transportation costs)
o WHEN – Point in Time
o HOW CERTAIN – Certainty of availability (subsidized vs. unsubsidized)
• Subsidies: Price= Costs + Profits – Subsidies
Fully-loaded costs
o Internal costs should be fully baked in, not external costs
o Variances for future expectations must be accounted for in total costs somewhere
o Stranded costs: issue of fairness when system changes occur.
• Existing investments in infrastructure for the utility may become redundant in a competitive environment