The method of numerical simulation was carried out to study the influence of the angle between the branches of the trigeminal street valley at 30°, 45°, 60°and 90° on the street valley wind environment and CO concentration to take Tianjin as an example under the action of three dominant wind directions in summer, and to obtain the ventilation performance of the street valley. Overall, the PFR and NEV values under the south wind were higher than those under the southeast and southwest winds, so the ventilation effect under the action of south wind was the best, and the southwest wind was the most unfavorable condition. The PFR and NEV values under the action of the three wind directions were the maximum values among the four cases under the angle of 30°, which was the best ventilation layout among the four cases, and the most unfavorable condition was at 60°.
The experimental study was carried out to explore the influence of refrigerant charging amount on the performance of the heat pump system. In the experiment, the amount of refrigerant to be charged was reflected by the pressure during refrigerant charging, and the pressure during refrigerant charging was changed to be 4.5 MPa, 5MPa, 5.5 MPa, 6 MPa and 6.5MPa, the ambient temperature was 25°,C and the outlet water temperature of the heat pump was set to 65°C. Experimental research showed that the refrigerant filling quantity change would affect the CO2 air source heat pump system performance parameters, When the refrigerant charging amount increased, the system had the minimum power consumption and the maximum COP, and the system heat production increased gradually, and the time consuming decreased first and then increased. When the pressure of refrigerant was 6MPa, the CO2 air source heat pump system reached the best operating condition, with the minimum power consumption of 0.79kW and the maximum COP of 5.11.
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