Dear Paul The reason why "Cooking Only", "Heating Only" and "Cooking + Heating" functions are important are as follows:
1: Cooking Only: In this case, for a given amount Fuel consumption, the only useful task performed is Cooking, so the Fuel Efficiency would be calculates as follows: Fuel Eff. = (Energy to Cook Pot) / (Energy in Fuel Consumed.) 2: Heating Only: In this case, where there is a need for Space Heating, the Fuel Efficiency would be calculated as follows: Fuel Eff. = (Energy to Heated Space) / (Energy in Fuel Consumed) I feel it is important to consider "Heating Only" stoves, in that they consume vastly more fuel where they are used. 3: Cooking + Heating: In this case, where there is a need for both a Cooking Capability and a Space Heating Capability, the heat loss from the shell of the stove is beneficial, and it can be sensibly added to the heat that was used for cooking. In this case, the Fuel Efficiency would be calculated as follows: Fuel Eff. = (Energy to Heated Space + Energy to Cook Pot) / (Energy in Fuel Consumed.) Note also that when the shell heat loss from such a stove is not needed, it cannot be claimed as a contributor to efficiency. The Test Report Protocol would have to adjust for the expected percentage of annual cooking time when the heating effect would be useful. Clearly, a "Cooking + Space Heating" stove will likely show an true efficiency that is higher than that of a "Cooking Only Stove" in that it can justifiable claim credit for space heating. This has important implications for the Stove Designer. For a "Cooking Only" stove, the designer should insulate the shell of the stove, to maximize heat available to the Cookpot and to minimize heat loss through the shell, in that any heat loss through the shell is wasted and the stove gets no credit for it. With a "Cooking only" stove in the tropics, the shell heat loss can actually be a disadvantage, simply from a discomfort standpoint. On the other hand, for a "Cooking + Heating" stove, there is less need for shell insulation, in that the shell heat loss has value. Note also that a Customer in a region requiring space heating may actually be able to avoid the need for a second stove if he has a "Cooking + Space Heat stove of adequate size. Most likely, however, his "optimal solution" would be two stoves... a smaller Cooking + Space Heating" stove that was sized for cooking needs would be used every day, primarily for cooking, but with extended running, it would provide for extra heating needs. in cold weather, a larger "Space Heating Only" stove would be fired up when the cook Stove heat loss was insufficient for comfort. Interesting, eh? Best wishes, Kevin ----- Original Message ----- From: Paul Anderson To: Discussion of biomass cooking stoves Sent: Tuesday, April 30, 2013 11:40 PM Subject: Re: [Stoves] Stove Definition Kevin, The definition provide by Christa raises an interesting question: Stove = ________________. And there are cookstoves or cook stoves = for cooking. Well, the there can be heat stoves or heating stoves that do not necessarily have capacity for cooking. One well know example is the Franklin Stove by Benjamin Franklin. So, "stove" usually implies cooking, but certainly can also be for space heating. But I will not debate this topic. Paul Paul S. Anderson, PhD aka "Dr TLUD" Email: [email protected] Skype: paultlud Phone: +1-309-452-7072 Website: www.drtlud.comOn 4/30/2013 12:09 PM, CHRISTA ROTH wrote: Kevin, find a definition attempt on https://energypedia.info/wiki/Improved_Cookstoves_-_What_is_it_all_about%3F it is a bit more specific than merriam-webster. Would you agree with the following: What is a stove? The term 'stove' refers to a device that generates heat from an energy carrier and makes that heat available for the intended use in a specific application. Cook stoves are made to transfer the generated heat to food, with the purpose to get it cooked and edible for human consumption. Thus 'a stove' features the combination of heat generation and heat transfer to a cooking pot if the food is cooked in a liquid, or a griddle, plancha etc. if the food is baked on a hot surface or roasted without liquid. Am 30.04.2013 um 18:50 schrieb Kevin <[email protected]>: Dear List Just what is a "stove?" I would suggest that it is important that we all know what a "stove" is, when we attempt to determine the difference between a "good stove" and a "poor stove.' When we ask Mr. Google, we get more than 7 million hits. However, the most common definitions seem to be typified by the one at http://www.merriam-webster.com/dictionary/stove " 1a : a portable or fixed apparatus that burns fuel or uses electricity to provide heat (as for cooking or heating) " At http://stoves.bioenergylists.org/ , the stated purpose of the site is: "Our site is dedicated to helping people develop better stoves for cooking with biomass fuels in developing regions. " What about accepting the Merriam-Webster definition for a "stove?" Would anyone have a better definition for a "stove?" Best wishes, Kevin _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://stoves.bioenergylists.org/ _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://stoves.bioenergylists.org/ ------------------------------------------------------------------------------ _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://stoves.bioenergylists.org/
_______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://stoves.bioenergylists.org/
