ABSTRACT
Space heating, cooling and domestic hot water supply represents the biggest share of energy in residential buildings [1]. There are a number of uses of hot water in buildings, including showers, sinks, dishwashers, clothes washers and others; the waste water retains a significant portion of its initial energy that could be recovered. By removing the waste heat it is possible to reduce the use of fossil fuels for heating water
and subsequently reducing greenhouse gas emissions to the atmosphere as a result. The systems described in this section will be used for the analysis of heat recovery system. Figure 1 illustrates the process of the heat recovered and in combination with a heat pump to increase the temperature of the recovered heat for space heating and domestic hot water supply.
