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三、工作蒸汽压力与节能的关系从公式(3)可知,如蒸发压力和冷凝压力不变,即压缩比 B 不变,工作蒸汽压力高,则膨胀比 E 大,喷射系数 u 将增加。即用相同数量的工作蒸汽可获得更多的制冷量,制冷效率较高。图4为根据式(3)绘制的性能曲线,从图中可见,压缩比 B 为一定值时,随着膨胀比 E 的提高,u 值将相应上升,当 E=550左右时,E 对 u 的影响已不显著。因为 E=P′/P″,当制冷机的制冷水温为15℃时,P″=0.017377公斤/厘米~2,则 P′=E×P″=550×0.017377
Third, the work of steam pressure and energy-saving relationship From formula (3) shows that, such as evaporation pressure and condensing pressure constant, that is, the compression ratio B constant, the work of steam pressure is high, the expansion ratio E large injection coefficient u will increase. That is, with the same amount of working steam to obtain more cooling capacity, higher cooling efficiency. Figure 4 shows the performance curve according to formula (3). From the figure, when the compression ratio B is a certain value, the u value will rise correspondingly with the expansion ratio E, and when E = 550, The impact is not significant. Because E = P ’/ P’, P ’= E × P “= 550 × 0.017377 when P” = 0.017377 kg / cm ~ 2 when the cooling water temperature of the refrigerator is 15 ° C