(a) Describe the stages in the system development life cycle for products. Include wha accomplished in each stage and what key decisions have to be made to advance to next stage. (b) What is the full meaning of the phrase "designing for the life cycle"? (c) Describe/explain the "three-legged stool" of systems development

Aheat pump using refrigerant-134a heats a house by using underground water at 8°c as the heat source. the house is losing heat at a rate of 60,000 kj/h. the refrigerant enters the compressor at 280 kpa and 0°c, and it leaves at 1 mpa and 60°c. the refrigerant exits the condenser at 30°c. determine: (a) the power input to the heat pump, (b) the rate of heat absorption from the water, and (c) the increase in electric power input if an electric resistance heater is used instead of a heat pump