5/28/2023 0 Comments Mountains to Sea by Mike Joy![]() ![]() ![]() ![]() Space heating in this case has a low exergy value and therefore we should seek to use sources of energy with a low exergy value as well. In looking to minimise exergy destruction where we can (in the case of residential/commercial #heating) we should try to use energy sources with an exergy value that is close to the exergy of the demand. To REALLY highlight this point the thermal energy contains only 4% of the exergy that the electrical energy contains (please check my math if you believe this to be incorrect). The electricity on the other hand could provide the 40kWh of hot water through a heat pump with additional electricity to drive traction motors (EVs, trains), pumps, compressors, provide lighting and power electrical equipment such as computers.Ĥ0kWh of electrical energy is clearly more valuable than the 40kWh of thermal energy in the hot water. district heating) or could be converted to electricity, although very inefficiently. The hot water could provide heating (i.e. In the image below, although the cubic meter of hot water holds as much #thermal energy as the #electrical energy used for lighting, the value of these two energy sources is very different. To this end it is important to understand the nature of resources so they are put to their appropriate use. minimise the destruction of #exergy where possible) as they pass through the economy. ![]() In my opinion it is important to consider, when looking at the #sustainable use of resources, that they are able to provide maximum work (i.e. ![]()
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