To utilize the renewable energy source from landfill gas(LFG) and reduce the consumption of fossil fuels

an LFG fueled biogas engine driven air source heat pump heating system was presented and its heating performance was studied.The type of the LFG collecting system and the LFG purifying process suitable for this system were determined.The experimental platform established can experimentally test two operating modes respectively

i.e.

the waste heat recovery from biogas engine exhaust fume alone or from both cylinder liner cooling water and exhaust fume simultaneously

by shifting the switching valves.The heating performance of the system was tested

and factors such as biogas engine speed

condenser water flow rate and condenser inlet water temperature

which have effect on the heating performance

were analyzed.Results of the experiment indicated that the total heating output of the system increased with biogas engine speed and condenser water flow rate

but it decreased with condenser water inlet temperature rise.Although the coefficient of performance(COP)and the primary energy ratio(PER) of the system reduced with condenser water inlet temperature rise as well

but their relationship with condenser water flow rate was not monotonic one.The study also revealed that the heating performance of the system was in its maximum when the condenser water flow rate ran at 1.45-1.65 kg·s-1

and the COP and PER of the system reached their maximum of 4.3 and 1.48 respectively when the condenser water inlet temperature was 35-45℃.