Work of breathing When there is increased gas flow resistance, the optimal respiratory rate decreases. This work (generally during the inhalation phase) is stored as potential energy which is recovered during exhalation. A pressure difference is required to overcome the frictional resistance to gas flow due to viscosity, and to provide non-elastic components of movement of the airway tissues to accommodate pulmonary volume change. Total work done against non elastic forces is 35% of total. Work is defined as a force applied over a distance. The SI unit of work is the Joule, equivalent to a force of 1 Newton exerted along a
Home Energy Resources Unit Home Energy Resources Unit The Home Energy Resources Unit or Home Energy Recovery Unit (HERU) is a prototype kitchen appliance which is claimed to use household waste to generate energy. Household waste, both organic and inorganic, is placed into a main chamber. Plastic and cardboard packaging as well as food waste can be inserted as fuel, and the waste does not need to be sorted or separated. It then goes through an eight-hour cycle. The chamber containing the waste is heated to 100° celsius to evaporate water and remove oxygen. The temperature is then increased and pyrolysis takes place. Oxygen