This study presents the environmental impact assessment of an absorption heat transformer designed to recover 1 kW of thermal energy from each 2 kW of waste heat supplies. The net contribution of the heat transformer ...This study presents the environmental impact assessment of an absorption heat transformer designed to recover 1 kW of thermal energy from each 2 kW of waste heat supplies. The net contribution of the heat transformer is a load avoided of 0.665 kg CO2 equivalents;the recovery process avoids 0.729 kg CO2 equivalents and the major contribution to the environment impacts is the pumping process with 0.0437 kg CO2 equivalents for each 1 kWh recovered. The study results show that absorption heat transformer is a good environmental option because it produces useful energy from waste heat and the final result is an environmental impact diminution.展开更多
The absorption cycle is a promising technology for harnessing low-temperature heat,playing a crucial role in achieving the objectives of carbon peaking and carbon neutrality.As a significant element in distributed ene...The absorption cycle is a promising technology for harnessing low-temperature heat,playing a crucial role in achieving the objectives of carbon peaking and carbon neutrality.As a significant element in distributed energy systems,the absorption cycle can utilize various types of low-grade heat to fulfill cooling,heating,and electrical energy demands.Therefore,it can be employed in diverse settings to unleash its substantial energy-saving potential.However,the widespread adoption of the absorption cycle is limited to specific scenarios.Hence,further efforts are needed to enhance its technological maturity,gain societal acceptance,and expand its application scope.Focusing on the utilization of different low-grade heat,this paper provides an overview of significant advancements in the application research of various absorption cycles,such as the absorption refrigeration cycle,absorption heat pump,absorption heat transformer,and the absorption power cycle.According to current research,absorption cycles play a critical role in energy conservation and reducing carbon dioxide emissions.They can be applied to waste heat recovery,heating,drying,energy storage,seawater desalination,refrigeration,dehumidification,and power generation,leading to substantial economic benefits.The paper also outlines the primary challenges in the current application of the absorption cycle and discusses its future development direction.Ultimately,this paper serves as a reference for the application research of the absorption cycle and aims to maximize its potential in achieving global carbon neutrality.展开更多
New trigeneration system consists of an internal combustion engine,a power and cooling cogeneration system and an absorption heat transformer system.The exhaust gas is recovered by the power and cooling cogeneration s...New trigeneration system consists of an internal combustion engine,a power and cooling cogeneration system and an absorption heat transformer system.The exhaust gas is recovered by the power and cooling cogeneration subsystem producing the cooling and power.The jacket water is recovered by the absorption heat transformer subsystem producing lowpressure steam.The exergy performance and the energy saving performance which is evaluated by the primary energy saving ratio of the new distributed energy system are analyzed.The effects of the ratio of the output power and cooling of the power and cooling cogeneration subsystem and the generator outlet temperature of the absorption heat transformer subsystem to the primary energy saving ratio are considered.The contributions of the subsystems to the primary energy saving ratio are quantified.The maximum primary energy saving ratio of the new distributed energy system is 15.8%,which is 3.9 percentage points higher than that of the conventional distributed energy system due to the cascade utilization of the waste heat from the internal combustion engine.展开更多
文摘This study presents the environmental impact assessment of an absorption heat transformer designed to recover 1 kW of thermal energy from each 2 kW of waste heat supplies. The net contribution of the heat transformer is a load avoided of 0.665 kg CO2 equivalents;the recovery process avoids 0.729 kg CO2 equivalents and the major contribution to the environment impacts is the pumping process with 0.0437 kg CO2 equivalents for each 1 kWh recovered. The study results show that absorption heat transformer is a good environmental option because it produces useful energy from waste heat and the final result is an environmental impact diminution.
基金financially supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA0400000)the National Key R&D Program of China(Grant No.2023YFB4005404)+1 种基金the National Natural Science Foundation of China(Grant No.52241601)the R&D Program of Institute of New Energy Dongguan(Grant No.2025-ZDBS-01)。
文摘The absorption cycle is a promising technology for harnessing low-temperature heat,playing a crucial role in achieving the objectives of carbon peaking and carbon neutrality.As a significant element in distributed energy systems,the absorption cycle can utilize various types of low-grade heat to fulfill cooling,heating,and electrical energy demands.Therefore,it can be employed in diverse settings to unleash its substantial energy-saving potential.However,the widespread adoption of the absorption cycle is limited to specific scenarios.Hence,further efforts are needed to enhance its technological maturity,gain societal acceptance,and expand its application scope.Focusing on the utilization of different low-grade heat,this paper provides an overview of significant advancements in the application research of various absorption cycles,such as the absorption refrigeration cycle,absorption heat pump,absorption heat transformer,and the absorption power cycle.According to current research,absorption cycles play a critical role in energy conservation and reducing carbon dioxide emissions.They can be applied to waste heat recovery,heating,drying,energy storage,seawater desalination,refrigeration,dehumidification,and power generation,leading to substantial economic benefits.The paper also outlines the primary challenges in the current application of the absorption cycle and discusses its future development direction.Ultimately,this paper serves as a reference for the application research of the absorption cycle and aims to maximize its potential in achieving global carbon neutrality.
基金This work was supported in part by the National Basic Research Program of China(No.2014CB249202)International Science&Technology Cooperation Program of China(No.S2014GR03880).
文摘New trigeneration system consists of an internal combustion engine,a power and cooling cogeneration system and an absorption heat transformer system.The exhaust gas is recovered by the power and cooling cogeneration subsystem producing the cooling and power.The jacket water is recovered by the absorption heat transformer subsystem producing lowpressure steam.The exergy performance and the energy saving performance which is evaluated by the primary energy saving ratio of the new distributed energy system are analyzed.The effects of the ratio of the output power and cooling of the power and cooling cogeneration subsystem and the generator outlet temperature of the absorption heat transformer subsystem to the primary energy saving ratio are considered.The contributions of the subsystems to the primary energy saving ratio are quantified.The maximum primary energy saving ratio of the new distributed energy system is 15.8%,which is 3.9 percentage points higher than that of the conventional distributed energy system due to the cascade utilization of the waste heat from the internal combustion engine.
