PV Gap

Sara Said:

urgent english help needed?

We Answered:

........save you up to 75 percent on your annual hot water bills. Only one sentence sounds brilliant mate.

Kenneth Said:

10 points to first CORRECT answer! 6 short Physical Science Q's?

We Answered:

1)ground
2)active solar heat
3)True
4)Convection
5)vapor to liquid
6)cannon

Oscar Said:

Natural Gas and Global Warming?

We Answered:

At present, natural gas is a better alternative than electricity in most parts of the US. Coal is used to generate more than half of the electricity in the US. About 40% of the energy in the coal is converted to electricity and after transmission losses only 90% of that (36%) reaches the consumer. In comparison, a high efficiency gas furnace can deliver 90% of the available energy as heat. Natural gas produces less CO2 per MJ than coal. There are even better options. It is -25C where I am now. A heat pump could heat the air from -25 C to +5 C at very low cost with minimal CO2 emissions. A gas or electric system is still needed to top up the temperature to a more comfortable 15-20 C, but only 1/3 of the heating comes from gas or electricity. Another very good and feasible method of heating is to use biomass. There are several successful projects in northern Europe based on willow plantations.
http://www.ruse-europe.org/IMG/pdf/Nowa_…
http://www.goodgovernance.coop/live/imag…
In rural areas agricultural residues are also readily available and have a similar heat content to low grade coal (15 - 17 MJ/kg).