Abstarct: Growing population and industry in this century, causes increase in fossil fuel consumption. On the other hand reduction in fossil fuel resources and increasing pollutions made countries to use renewable energy as fuel and high efficiency power system instead of conventional systems. In this thesis two arrangements for CCHP system proposed to recover waste heat energy of fuel cell. Proposed systems can use for residential application. This system modeling had been done in energy, exergy, fuel energy saving ratio and carbon dioxide emission reduction way. Output work of fuel cell in this thesis is 38.63 kW and heat generated by PEM is 39.17 kW. First arrangement fuel cell energy efficiency is 37.21% but second is 32.61%. Also when first system works in CCHP mode efficiency is 68% but second arrangement’s efficiency in CCHP mode is 75.83%. The highest irreversibility losses occur at PEM, first system irreversibility is 47.21 kW but second system irreversibility is 84.21 kW. First system has 34% and 25% FESR and CDER respectively. But FESR and CDER of second system is 40.23% and 22.75% respectively. Also results showed that increase in PEM fuel cell operating pressure, growth energy and exergy efficiency of PEM but decreases COP of absorption chiller.