دانلود کتاب دیدگاه های منطقه ای در مورد مزرعه انرژی

In a broad sense, farms have always been “energy driven“, since they function by transforming solar energy into stored chemical energy via photosynthesis (i.e. the growing of crops). For some farms, this stored energy is the final product, in the form of hay, grain, plant fibers and the like. However, many farms carry out further “bioprocessing“ to move the stored energy into the form of milk, meat, animal-based power, etc. Additional, less obvious uses of solar energy on the farm include the warming of greenhouses through solar gain and the use of wind (which is a byproduct of solar radiation on the earth) to ventilate agricultural structures. However, such a philosophical approach to farm energy, while interesting, is usually of limited practical use. Instead, when we speak of energy use on the farm, we usually are using a narrower sense of the word “energy” in terms of electricity or fuel (solid, liquid, or gaseous) that is used to carry out work or provide heat on the farm. Farm energy can be produced by biological organisms (i.e. animal driven farm implements or compost-based heating systems), but it is usually produced by mechanical devices (i.e. motors, engines, boilers). Energy use on the farm has two main purposes: replace labor and perform tasks that cannot be done otherwise.