The relative performances of six air source heat pumps (ASHP) and a solid oxide fuel cell micro-combined
heat and power (SOFC-mCHP) unit are compared using a modelling approach. The emphasis is in indicating
the effect of a wide range of operating conditions and methodologies, rather than detailed analysis
of the performance of the units under limited specific circumstances. The effect of control methodologies
is the primary focus but other variables such as the climate and the specification of the buildings to
which heat is supplied are considered. Several significant findings emerge. Firstly, a reduction in heating
demands due to warmer will reduce the impacts of both heating systems. In the case of ASHPs, lower
heat demands improve performance. In the case of SOFC-mCHP systems they reduce the need for auxiliary
heating. A wide range of performances may be achieved by ASHPs, even supplying heat to the same
building; the way in which ASHP units are controlled has the potential to reduce their impacts by more
than a third. The greatest savings achieved by the SOFC-mCHP unit occur when it is run continuously
at full output, despite the consequent dumping of excess heat. Although the auxiliary heaters used with
them inevitably reduce their overall benefit, they are still capable of significant savings. It is currently
possible for the units to offset more emissions than they create.
The relative performances of six air source heat pumps (ASHP) and a solid oxide fuel cell micro-combinedheat and power (SOFC-mCHP) unit are compared using a modelling approach. The emphasis is in indicatingthe effect of a wide range of operating conditions and methodologies, rather than detailed analysisof the performance of the units under limited specific circumstances. The effect of control methodologiesis the primary focus but other variables such as the climate and the specification of the buildings towhich heat is supplied are considered. Several significant findings emerge. Firstly, a reduction in heatingdemands due to warmer will reduce the impacts of both heating systems. In the case of ASHPs, lowerheat demands improve performance. In the case of SOFC-mCHP systems they reduce the need for auxiliaryheating. A wide range of performances may be achieved by ASHPs, even supplying heat to the samebuilding; the way in which ASHP units are controlled has the potential to reduce their impacts by morethan a third. The greatest savings achieved by the SOFC-mCHP unit occur when it is run continuouslyat full output, despite the consequent dumping of excess heat. Although the auxiliary heaters used withthem inevitably reduce their overall benefit, they are still capable of significant savings. It is currentlypossible for the units to offset more emissions than they create.
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