Earning estimation models for waste heat recovery of circulating water by absorption type heat pump under 4 typical engineering conditions were derived.Taking the waste heat utilization project of recycled water in a 300 MW unit as the example,benefit calculation was performed.Results show that,among the earnings obtained by different estimation models,the minimum value is 1.262×107 yuan while the maximum is 4.100×107 yuan,which has big difference.Therefore,the authors suggest that proper earning estimation...