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Fig. 2 Temperature changes in high-temperature water and cell cooling waterduring Mitrl-up of WGAR (The range or temperature cluingc in llicccll eixilmj* water during ordinary operation is assumed to be 100%)

0 50 100 150 200 Load (kW) Fig 3 Eiflcicncy of PC25C (LHV)

Test results of VVGAR

A lest to evaluate the effectiveness of this system was started in the summer of 1996. The data for two days when the atmospheric temperature and the room-cooling load were almost equal are shown below.

Figure 4 shows the fuel cell waste heat input and gas consumption while using fuel cell waste heat. Figure 5 shows gas consumption where fuel cell waste heat was not used. The variation of atmospheric temperature and the room-cooling load were in similar condition.

Room-cooling load is about 60% of the rated load of WGAR, waste heat is used prior to city gas, and all of the fuel cell waste heat is used. The reduction in city gas consumption was 360Mcal/day, and the reduction ratio was 17%.

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