Supply hot water through retrieving unused low-temperature waste heat
2-stage absorption heat pumps are devices which can recover heat from unused low-temperature energy, such as wastewater-treating water, and heat and supply hot water. These devices are used when there is a temperature gap between low-temperature heat sources to be recovered and hot water whose temperature is low and which requires a large increase.
The only existing technology in this field are 2-stage vapor compression heat pumps which consume a large amount of energy to recover heat from low-temperature wastewater-treating water. Moreover, there are limitations in recovering low-temperature heat with absorption heat pumps which need almost no power. (1-stage absorption uses low-temperature heat sources higher than 30 ℃) When the operation temperature is high, 2-stage absorption heat pumps can improve the COP through producing double effects together.
- Achieved 20℃ increase in temperature of hot water / Raised temperature of hot water from 50℃ to 70℃ through recovering waste heat from wastewater-treating water heat sources
- Achieved 55℃ temperature gap in waste heat recovery / Achieved hot water supply temperature of 70℃ through recovering 15℃ wastewater-treating water