Waste Heat Recovery Bruce Phillips Managing Director email@example.com Free Hot water……… • Collecting waste heat from large air-conditioning systems offers a highly efficient means to provide pre-heated hot water to hotels • Desuperheaters are heat exchangers that can be added to an air conditioning or other refrigeration equipment, either at the factory or in the field. • They heat water with 5 to 15% of the energy that would otherwise be given up by the system's condenser. • When properly applied, desuperheaters can provide a lot of useful high efficiency water heating. However, they provide water heating only when the system to which they are attached is operating. Backup water heating is needed at other times. Typical installation • A large insulated hot water storage tank is required (approx 2000 liters). • As long as the compressor is operating, the system is able to provide pre- heated water at around 50 to 55 0C from “waste heat”. • 2000 liter tank will retain constant temperature and act as a pre-heater for the main hot water supply. • Additional energy efficiency is gained from as heat is drawn off the chiller, thus reducing the amount of heat to be discharged -allows additional energy saving from slowing condenser or cooling tower fan motors • Resorts that have used these systems are Naviti, Fijian, Radisson, Sheraton, Novotel and Mecure .