Abstract
The study is aimed at the frosting problem of the air source heat pump in the low temperature and high humidity environment, which reduces the service life of the system. First, the frosting characteristics at the evaporator side of the air source heat pump system are analyzed. Then, a new defrost technology is proposed, and dimensional theory and neural network are combined to predict the transfer performance of the new system. Finally, an adaptive network control algorithm is proposed to predict the frosting amount. This algorithm optimizes the traditional neural network algorithm control process, and it is more flexible, objective, and reliable in the selection of the hidden layer, the acquisition of the optimal function, and the selection of the corresponding learning rate. Through model performance, regression analysis, and heat transfer characteristics simulation, the effectiveness of this method is further confirmed. It is found that, the new air source heat pump defrost system can provide auxiliary heat, effectively regulating the temperature and humidity. The mean square error is 0.019827, and the heat pump can operate efficiently under frosting conditions. The defrost system is easy to operate, and facilitates manufactures designing for different regions under different conditions. This research provides reference for energy conservation, emission reduction, and sustainable economic development.
Highlights
Energy and environmental issues brought about by increasing energy consumption have attracted increasing attention
In the past 50 years, a lot of and fruitful research has been conducted on the frosting mechanism and frosting characteristics of heating devices, with various mathematical models established to predict frost layer growth and heat exchanger performance
It is noted from the table that, under the same number of optimal hidden layers, the adaptive momentum gradient algorithm has lower errors in Root Error (RE), mean square error (MSE), and root mean square error (RMSE), which are 0.0755, 0.0068, and 0.0827, respectively, and there are significant differences from other algorithms
Summary
Energy and environmental issues brought about by increasing energy consumption have attracted increasing attention. A heat pump is a device that can obtain low-grade energy from the air, water, or soil, and convert it to high-grade heat energy through electric power [3]. Air source heat pump is a device that uses air as a low-grade heat source to obtain hot water or hot air from it [6] It has high energy efficiency, and reduces heating energy consumption and environmental pollution. Aimed at the easy frosting under low temperature and high humidity, especially the reduced heat capacity during defrosting, the frosting characteristics at the evaporator side are summarized. A new defrosting system is proposed, and its thermodynamics and heat transfer performance are simulated
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
