Comments on: Waste Heat Could Double Battery Life on Laptops, Cell Phones http://www.alternative-energy-news.info/waste-heat-battery-life-laptops-cell-phones/ Alternative Energy News and Information about Renewable Energy Technologies: Articles, Discussions, News and Videos. Thu, 18 Mar 2010 18:03:38 +0000 http://wordpress.org/?v=2.9 hourly 1 By: Ryan Ruiz http://www.alternative-energy-news.info/waste-heat-battery-life-laptops-cell-phones/#comment-8911 Ryan Ruiz Tue, 01 Dec 2009 18:04:27 +0000 http://www.alternative-energy-news.info/?p=748#comment-8911 I am happy to announce the Rattler Energy is marketing a waste heat generator that runs on heats as low as 185F. If you will go to my website you will be able to see the generator. I am happy to announce the Rattler Energy is marketing a waste heat generator that runs on heats as low as 185F. If you will go to my website you will be able to see the generator.

]]> By: Uli F. Wischnath http://www.alternative-energy-news.info/waste-heat-battery-life-laptops-cell-phones/#comment-8899 Uli F. Wischnath Mon, 30 Nov 2009 17:54:01 +0000 http://www.alternative-energy-news.info/?p=748#comment-8899 Thinking of and realizing ways to save energy is an important task. The described technology could prove very valuable for large power plants. The available temperatures are considerably above room temperature (80°C, 175°F) and the amount of heat is vast. In this case it should be feasible to run a device that allows to use 15% (Carnot limit) of the 60 % waste heat or in other words increasing the overall efficiency by up to 9%. 5% might be more realistic, but reaching this would be great! But please do not make promises which can't be held. Doubling the battery life of a laptop is absolutely unrealistic. Assuming a temperature of about 50°C (125°F) allows according to Carnot a maximum efficiency of 10 % for the conversion of heat into energy. If a lot of power, lets say 70 %, is converted to heat which can be used with the above conversion mechanism then only 7 % additional energy can be fed into the battery. And these will be used with the same (low) efficiency as the original input. Thinking of and realizing ways to save energy is an important task. The described technology could prove very valuable for large power plants. The available temperatures are considerably above room temperature (80°C, 175°F) and the amount of heat is vast. In this case it should be feasible to run a device that allows to use 15% (Carnot limit) of the 60 % waste heat or in other words increasing the overall efficiency by up to 9%. 5% might be more realistic, but reaching this would be great!

But please do not make promises which can’t be held. Doubling the battery life of a laptop is absolutely unrealistic. Assuming a temperature of about 50°C (125°F) allows according to Carnot a maximum efficiency of 10 % for the conversion of heat into energy. If a lot of power, lets say 70 %, is converted to heat which can be used with the above conversion mechanism then only 7 % additional energy can be fed into the battery. And these will be used with the same (low) efficiency as the original input.

]]> By: Stan http://www.alternative-energy-news.info/waste-heat-battery-life-laptops-cell-phones/#comment-8898 Stan Mon, 30 Nov 2009 12:55:05 +0000 http://www.alternative-energy-news.info/?p=748#comment-8898 Good intentions! So far all the devices like these failed in terms of their efficiency. Harnessing low temp differentials is tough. There is a gold mine in waste heat, but only if one can easily pick up a grain of gold from an Earth sized pile of trash and carry on doing it a million times over to get a kilo gold slab in the end. Good intentions! So far all the devices like these failed in terms of their efficiency. Harnessing low temp differentials is tough. There is a gold mine in waste heat, but only if one can easily pick up a grain of gold from an Earth sized pile of trash and carry on doing it a million times over to get a kilo gold slab in the end.

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