Abstract
This thesis investigates a novel solar-assisted heat pump integrated phase change energy storage system. The defrosting performance of this system was studied experimentally and the results were compared with two traditionally used methods: reverse cycle defrosting (RCD) method and hot gas bypass defrosting (HGBD) method. The results show that the phase change energy storage system has superior performance compared with traditional defrosting methods. The indoor temperature drop recorded was relatively small and the defrosting time was 75% of the RCD system and 53% of HGBD system. The phase change energy storage system increased the condensation temperature which consequently increased the temperature difference of heat transfer resulting in higher conductivity in the defrosting progress. Compared with the method of RCD and the method of HGBD, the recovery time of the system was shortened by 90 and 160 seconds, respectively. The system works with low-temperature heat source and circulating water, which considerably reduces energy consumption, thereby improving the performance of the defrosting system. A further experimental study was also conducted on the heating performance and the results also indicated that the value of COP can reach up to 3.6 in daytime, and the indoor temperature can be stably maintained above 18°C throughout the day. Novelty Statement A new defrosting method for energy storage defrosting is proposed, and the defrosting performance is compared with two common defrosting methods. In addition, the performances of the heating system over the day were experimentally investigated. The experimental results show the system meets the heating needs of the building. Finally, the influence of the outdoor temperature on the exergy efficiency of the system was discussed. It shows that this system can improve the operational stability, the system economy and energy saving.
Highlights
With the excessive consumption of traditional energy sources, humans beings have to utilize new energy sources such as solar energy to reduce energy consumption and improve the efficiency[1,2,3]
The proposed reverse cycle defrosting (NRCD) method was tested on a 8.9kW applying this method for the experimental (ASHP) device, where the discharge pressure increased by 0.33MPa
Following conclusions were drawn from the investigation of the three defrosting methods: 1. Phase change energy storage defrosting method was shown to be better than the two conventional defrosting methods: RCD and hot gas bypass defrosting (HGBD)
Summary
With the excessive consumption of traditional energy sources, humans beings have to utilize new energy sources such as solar energy to reduce energy consumption and improve the efficiency[1,2,3]. A defrosting method for cascade air source heat pumps (CASHPs) reverse circulation based on heat storage was proposed. The proposed reverse cycle defrosting (NRCD) method was tested on a 8.9kW ASHP device, where the discharge pressure increased by 0.33MPa. Compared with the traditional RCD methods, the recovery time disappeared, and the total energy consumption decreased by 27.9% 20. An ASHP defrost system was proposed in which the heat storage of the compressor casing is combined with reverse cycle defrosting (RCD) and hot gas bypass defrosting (HGBD) system using compressor shell to store heat 21. In order to solve the cold storage problem of cascade air source heat pump (CASHPs), a reverse cycle defrosting method based on thermal energy storage (TES). The influence of the outdoor temperature on the exergy efficiency was discussed
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