The ventilator of the heating tower and the circulating pump of the anti-freeze solution are the main electrical equipment of a heating tower heat pump system, besides the compressor. By controlling the working frequencies of the ventilator of the heating tower and circulating pump of the anti-freeze solution, the effects of the operation parameters of a closed-type heating tower on its heat absorption and the performance of heating tower heat pump system were investigated under winter heat conditions. The results indicated that reducing the frequency of the circulating pump for the anti-freeze solution leads to a decrease in the temperature of the outlet evaporator of the anti-freezing solution and an increased temperature difference between the anti-freeze solution flowing into and out of the heating tower; meanwhile, excessively high and low anti-freeze flow rates lead to reduced heat absorption of the closed-type heating tower. The coefficient of performance fluctuates slightly if the frequency of circulating pump is above 20 Hz, but a slight drop in coefficient of performance is observed when the frequency is less than 15 Hz. The system energy efficiency ratio tends to increase as the frequency of circulating pump is reduced, although a substantial reduction occurs at 10 Hz. Furthermore, a reduced ventilator frequency decreases the temperatures of the anti-freeze solution at the inlet and outlet of the heating tower and the temperature difference, hindering the heat absorption of the heating tower. With reductions in the ventilator frequency, the coefficient of performance exhibits an initial increase followed by subsequent decreases, while the system energy efficiency ratio showed continual increases until the ventilator frequency dropped to 10 Hz. When the ventilator frequency or circulating pump frequency drops to 15 Hz and 10 Hz, the evaporation temperature of the heat pump unit decreases, resulting in an excessively exhaust temperature, which is not favorable for the safe operation of the system.

中文翻译：

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封闭式供热塔运行参数对供热塔热泵系统性能的影响

供热塔通风机和防冻液循环泵是供热塔热泵系统除压缩机外的主要电气设备。通过控制供热塔通风机和防冻液循环泵的工作频率，研究了封闭式供热塔运行参数对其吸热量和供热塔热泵系统性能的影响。在冬季高温条件下。结果表明，降低防冻液循环泵的频率会导致防冻液出口蒸发器温度降低，防冻液流入和流出的温差增大。加热塔；同时，过高和过低的防冻液流量导致封闭式加热塔的吸热量降低。循环泵的频率在20Hz以上时，性能系数略有波动，但在频率小于15Hz时，性能系数略有下降。随着循环泵频率的降低，系统能效比趋于增加，尽管在 10 Hz 时会出现显着降低。此外，降低通风机频率，降低了加热塔进出口防冻液的温度和温差，阻碍了加热塔的吸热。随着呼吸机频率的降低，性能系数表现出最初的增加，然后是随后的下降，而系统能效比则呈持续上升趋势，直至呼吸机频率降至 10 Hz。当通风机频率或循环泵频率下降到15Hz和10Hz时，热泵机组蒸发温度降低，导致排风温度过高，不利于系统的安全运行。