发一个低温冷库的负荷计算
Let’s suppose we need to design the refrigeration system for the freezing room Size: 10M*10M*3M Room temp:-18℃ evaporating temp:-23℃Stock: meat ρ=650KG/M^3Intake temp:35℃ outtake temp:-15℃Freezing time: 20HPanel: 1 aluminium panel +150 polyurethane panel+1 aluminium paneldesigning cond. temp:45℃，sub cool:5℃, cond. pressure:P=1.5MPAevaporation temp:-25℃，over heat:20℃, evaperation pressure: P=0.18MPA.Room capacity :G=Vρη/1000=300*650*0.4/