1992) proposed an open absorption system for
flue gas heat recovery using the liquid desiccant as the cycling medium.
Therefore, the efficiency of
flue gas heat recovery can be increased by using preheating by 20 -50[degrees]C and humidification of the outdoor air delivered to the burners in the boiler 6.
The Department of Energy and Climate Change's UK National Energy Efficiency Action Plan also found that 1.6 million households could benefit from heating controls, 5 million could benefit from hot water cylinder thermostats and 7.6 million could save money with passive
flue gas heat recovery systems.
A further 700 kW of energy was recovered from the boiler breeching using a
flue gas heat recovery system.
The properties include a range of green features -including efficient condensing boilers, high levels of insulation and passive
flue gas heat recovery systems which mean hot air generated by the boiler is used to pre-heat the water before it is heated by the boiler -which could lead to reduced bills.
The Building Research Establishment at Watford has defined such a device as a passive
flue gas heat recovery device, and it can make the boiler system 97% efficient in actual domestic use over the year.