In most energy transfers there is no loss of energy at all. This reduces energy transfer by conduction. Energy transfer diagrams show each form of energy whether it is stored or not and the processes taking. Functionally turning all of the input energy into the output energy is nigh impossible unless one is deliberately turning energy into heat like in a heater. In physics energy is a quantity that provides the capacity to perform work think of lifting or warming an object.
When energy is transformed from one form to another or moved from one place to another or from one system to another there is some energy loss. This reduces energy transfer by conduction. For example a roller coaster sitting at the top of a hill is said to have potential energy. Energy transformation also termed energy conversion is the process of changing energy from one of its forms into another.
Cooking solar heat dry clothes dry food solar is still main light source no need for conversion. If one unrealistically assumes that there is no friction or other losses. Different forms of energy can be transferred from one form to another. But most escapes as heat which is produced when energy is transferred from one form to another.
How everything happens energy makes everything happen and every time something happens there is an energy change. Some of that energy is stored as fat some is lost through wastes urine and feces. Conversely the mass equivalent of an everyday amount energy is minuscule which is why a loss of energy loss of mass from most systems is difficult to measure on a weighing scale unless the energy loss is very large. Historic energy conversion sequences biomass heat esp.
An organism acquires energy from the food it eats. The concentration of thermal energy is the same on both sides so there is no more energy flow. There is air or an even better insulator such as argon gas between the two panes of glass. The most cost effective way is to improve the homes envelopethe walls windows doors roof and floors that enclose the homeby improving the insulation conduction losses and sealing the air leaks with caulking convection losses.