Performance analysis and optimization for a novel air-source gas-fired absorption heat pump

Abstract

In district heating technologies, gas fired boilers and conventional heat pumps have poor performance at low ambient temperature. To tackle this issue, this study has proposed a novel air-source gas-fired absorption heat pump for district heating with flue gas recovery. Compared with conventional absorption heat pumps, the proposed solution in this study can absorb heat from both air and flue gas.Additionally, the working fluid works properly when air temperature is below 0 °C, safe and nonflammable. To analyze the economic and the thermodynamic performance of this air-source gas-fired absorption heat pump, a mathematical model, considering energy, exergy, economy and environment, has been developed.According to the simulation results of the model, the proposed air-source gas-fired absorption heat pump system here had good stability and feasibility under various operational conditions. However, as the payback period and the exergy destruction were found to be conflicting with each other, a multi-objective optimization method was established to minimize the system's payback period and exergy destruction simultaneously. Additionally, the technique for order preference by similarity to an ideal solution decision-making method has been applied to look for the optimal solutions in the Pareto frontier, with optimal solutions of the system under different operational conditions recommended.

Investigating the performance of heat exchangers in absorption heat pump systems using both numerical and experimental methods

“…An, Bn, and Cn are the constant coefficients. The calculation equations for the solution specific heat, mixed heat and mole enthalpy of R22-DEGDME could be found in [28]. According to the first law of thermodynamics, the thermal load of each component can defined.…”

“…Furthermore, R22-DEGDME solution utilized by the absorption heat pump can operate with non-toxic, non-flammable, and non-icing performance at ambient temperatures below 0℃ [28]. The aforementioned existing studies were all conducted to study the working fluid pairs in absorption refrigeration process.…”

Analysis of Energy Consumption of a Thermo-Technical System with an Absorption Heat Pump

“…Wu et al [11] have presented a solar absorption heat pump with air as the heat source and exhaust gas recovery. Compared to conventional solar heating systems, the gasfired system had better performance and produced fewer pollutants.…”

Development of integrated technology for waste heat recovery from humid flue gas of hot water boiler

“…It can be seen that the absorption heat pump plays a connecting role in the whole system, and is one of the core equipment of the system 17 . There are three main driving modes of absorption heat pump: high‐temperature flue gas, 18 steam 19 and hot water, 20 the gas‐driven mode is generally used in gas boiler.…”