by Denny » Wed 06 Jul 2005, 22:35:19
$this->bbcode_second_pass_quote('Leanan', '
')People with electric heat might do best. Natural gas is in extremely short supply. Heavy oil like heating oil is more easily transported, but demand tends to be inelastic, so prices may be quite high.
I completely disagree.
First, much electricity is generated by natural gas.
Secondly, when you turn any fossil fuel into electricity there is a temendous thermodynamic loss, as most of the heat is not converted into power, its lost to the environment through the pheonomen known as the latent heat of vaporization. The steam leaving the turbine at a power plant is a "wet" mix of water droplets and steam vapour and is condensed back to liquid by passing it through a heat exchanger usually on the bank of a river or a lake. This must be done to allow the lquid to be pumped back around the circuit.
I understand the best of designs only capture 40% to 50% of the heat content of the fuel.
Next step, the power has to get to you from the generating station. Another loss, 5% to 10% for resistance loss throught eh transmisison system. At best you are getting 45% of the original heat content of the fossil fuel used. That is why electricity costs more per kwh than the equivalent BTU content. One could argue that if hydroelectric or wind power is used then this is not an issue here. But there is, as this forms the "base" power supply for lighting and electric motors and the like. So, its already "claimed" and cannot be used for heating.
If you just take the basic natural gas and burn it in a conventional gurnace, you can get 85% to 90% of the heat content turned into interior space heating, with the balance up the flue. High efficiency furnaces can get upwards of 95%.
Electric space heating is a big waste of energy.