Log-or-Trig : シンソウニューラルネットワークニオケルコウリツテキガクシュウキコウ

博士（工学）東京農工大

Solar-air hybrid source heat pump water heater: Performance characterization and comparison analysis

Abstract Heat pump water heater(HPWH) can yield great energy saving for commercial and residential appliance. To enable the HPWH maintain efficient operation under diverse circumstances, the solar-air hybrid source heat pump water heater has been proposed. The configurations of solar-air series type, air-solar series type and solar-air parallel type have been discussed and compared in this paper. The dynamic model has been developed to identify the impacts of solar irradiation and environmental temperature. The results show that the solar-air hybrid source heat pump water heater can guarantee efficient operation under the ambient temperature of 10°C and solar irradiation of 100W/m2, with the average COPs of 2.68 for solar-air series type HPWH, 2.71 for air-solar series type HPWH and 2.69 for solar-air parallel type HPWH. The rise of ambient temperature can improve the evaporating capacity and condensing capacity leading to the increase of power consumption and COP for each type of solar-air hybrid source heat pump water heater. With the rise of solar irradiation, the heat gain at evaporation side increases leading to the rise of condensing capacity and COP. The air-solar series type HPWH can achieve the highest COP under a range of working conditions and solarair parallel type HPWH can provide the highest condensing capacity under lower solar irradiation.</jats:p

<b>Investigation on the indoor thermal comfort in sports settings and an improvement to Fanger model</b>

Abstract Player in sports is characterized as large metabolic rate and perspiration, small thermal resistance, low coverage rate of clothing and short breath. The heat transfer from the player to environment is generally strong. It is difficult to accurately predict the thermal comfort of the player in strenuous sports based on the traditional Fanger’s model. To overcome this limitation, an improved Fanger’s model is established on the basis of the original predicted mean vote (PMV) model in this paper. Theoretical analysis of PMV based on traditional model and improved model is performed, and a series of experiments involving 798 surveys in 40 experimental sessions under various sport events are conducted. On this basis, the accuracy of traditional Fanger’s model and the improved model is compared. Results show that the improved model is more reasonable and has better agreement with the experiment results. In both simulation and experiment, the PMV predicted by the improved model is lower than that predicted by traditional Fanger’s model, which indicates that the heat dissipation calculated by the new model is higher. The improved model can predict thermal comfort of human in sports under different thermal environment with higher accuracy compared with conventional Fanger’s model. Finally, based on improved Fanger’s model, reasonable ambient temperature under different exercise intensities is recommended, which is significant to prevent occurrence of heat injury in sports and energy saving of heating, ventilation, and air conditioning (HVAC) system in gymnasium.</jats:p