【《某水产冷库内各项冷负荷计算过程案例》2800字】

某水产冷库内各项冷负荷计算过程案例1.1冷库内各项冷负荷计算1.1.1围护结构构造和冷负荷Q1①围护结构构造和参数由于不同库房围护结构的隔热层厚度不一致，这里根据公式：K=1对隔热层材料的厚度进行计算。表3-1外墙序号构造材料厚度δ(m)导热系数λ(w/m.℃)热阻R=δ/λ(㎡.℃/W)1外粉饰面0.00510.0052防水抗裂砂浆0.010.930.0113聚苯板材0.0250.0440.5684抹平砂浆0.020.930.0225钢筋混凝土0.361.740.2076聚氨酯发泡隔音隔热层0.140.0314.5167内粉饰面0.0110.0108墙体表面空气热阻冷藏间墙体0.127冻结间墙体0.079贮冰间墙体0.1279总热阻冷藏间墙体5.465冻结间墙体5.417贮冰间墙体3.81510传热系数冷藏间墙体0.183冻结间墙体0.185贮冰间墙体0.262表3-2内墙序号构造材料厚度δ(m)导热系数λ(w/m.℃)热阻R=δ/λ(㎡.℃/W)1外粉饰面0.00510.0052防水抗裂砂浆0.010.930.0113聚苯板材0.0250.0440.5684抹平砂浆0.020.930.0225钢筋混凝土0.361.740.2076内粉饰面0.0110.0107墙体表面空气热阻冷藏间墙体0.127冻结间墙体0.079贮冰间墙体0.1278总热阻冷藏间墙体0.951冻结间墙体0.901贮冰间墙体0.9499传热系数冷藏间墙体1.05冻结间墙体1.11贮冰间墙体1.05表3-3屋顶序号构造材料厚度δ(m)导热系数λ(w/m.℃)热阻R=δ/λ(㎡.℃/W)1青瓦片0.0110.0102瓦片支撑梁0.0110.0103导水槽0.0110.0104高性能防水沥青卷材0.0150.270.0565木质隔板0.0110.0106膨胀聚苯板材0.150.0423.5717石膏注塑板材0.020.330.0618墙体表面空气热阻冷藏间墙体0.127冻结间墙体0.079贮冰间墙体0.1279总热阻冷藏间墙体5.467090188冻结间墙体5.419090188贮冰间墙体4.49009018810传热系数冷藏间墙体0.184冻结间墙体0.185贮冰间墙体0.222表3-4地坪序号构造材料厚度δ(m)导热系数λ(w/m.℃)热阻R=δ/λ(㎡.℃/W)1细石混凝土0.061.510.0402挤塑聚苯板材0.080.032.6673高强度防水涂料0.0110.0104钢筋混凝土0.11.280.0785夯实粘土填充物0.21.160.1728墙体表面空气热阻冷藏间墙体0.127冻结间墙体0.079贮冰间墙体0.1279总热阻冷藏间墙体3.82冻结间墙体3.78贮冰间墙体2.6610传热系数冷藏间墙体0.261冻结间墙体0.265贮冰间墙体0.375②围护结构冷负荷计算Q1围护结构传入热计算公式为：Q1上式中，K的计算公式为：K=1表3-5冷间围护结构传入热计算表库房名称墙体长(m)宽(m)高(m)F(m²)KaΔtQ1冷藏间#1东墙24-51201.05100西墙24-51200.1831491076.04南墙15-5750.183149672.525北墙15-5750.183149672.525屋顶2415-3600.1841493245.76地坪2415-3600.2611201879.2合计7546.05库房名称墙体长(m)宽(m)高(m)F(m²)KaΔtQ1冷藏间#2东墙24-51201.05100西墙24-51201.05100南墙15-5750.183149672.525北墙15-5750.183149672.525屋顶2415-3600.1841493245.76地坪2415-3600.2611201879.2合计6470.01库房名称墙体长(m)宽(m)高(m)F(m²)KaΔtQ1冷藏间#3东墙24-51201.05100西墙24-51201.05100南墙15-5750.183149672.525北墙15-5750.183149672.525屋顶2415-3600.1841493245.76地坪2415-3600.2611201879.2合计6470.01库房名称墙体长(m)宽(m)高(m)F(m²)KaΔtQ1冷藏间#4东墙24-51200.1831491076.04西墙24-51201.05100南墙15-5750.183149672.525北墙15-5750.183149672.525屋顶2415-3600.1841493245.76地坪2415-3600.2611201879.2合计7546.05库房名称墙体长(m)宽(m)高(m)F(m²)KaΔtQ1冷藏间#5东墙24-51201.05100西墙24-51200.1831491076.04南墙15-5750.183149672.525北墙15-5750.183149672.525屋顶2415-3600.1841493245.76地坪2415-3600.2611201879.2合计7546.05库房名称墙体长(m)宽(m)高(m)F(m²)KaΔtQ1冷藏间#6东墙24-51201.05100西墙24-51201.05100南墙15-5750.183149672.525北墙15-5750.183149672.525屋顶2415-3600.1841493245.76地坪2415-3600.2611201879.2合计6470.01库房名称墙体长(m)宽(m)高(m)F(m²)KaΔtQ1冷藏间#7东墙24-51201.05100西墙24-51201.05100南墙15-5750.183149672.525北墙15-5750.183149672.525屋顶2415-3600.1841493245.76地坪2415-3600.2611201879.2合计6470.01库房名称墙体长(m)宽(m)高(m)F(m²)KaΔtQ1冷藏间#8东墙24-51200.1831491076.04西墙24-51201.05100南墙15-5750.183149672.525北墙15-5750.183149672.525屋顶2415-3600.1841493245.76地坪2415-3600.2611201879.2合计7546.05库房名称墙体长(m)宽(m)高(m)F(m²)KaΔtQ1冻结间#9东墙6-5301.11100西墙6-5300.185154299.7南墙15-5750.185154749.25北墙15-5750.185154749.25屋顶156-900.185154899.1地坪156-900.265125596.25合计3293.55库房名称墙体长(m)宽(m)高(m)F(m²)KaΔtQ1冻结间#10东墙6-5300.185154299.7西墙6-5301.11100南墙15-5750.185154749.25北墙15-5750.185154749.25屋顶156-900.185154899.1地坪156-900.265125596.25合计3293.55库房名称墙体长(m)宽(m)高(m)F(m²)KaΔtQ1贮冰间东墙10-5500.262141537.1西墙10-5500.262141537.1南墙12-5600.262141644.52北墙12-5600.262141644.52屋顶1012-1200.2221411092.24地坪1012-1200.375112540合计3995.481.1.2计算货物放热量Q2查阅参考文献《制冷装置设计》，可得货物放热量Q2的计算公式为：Q2=本次设计的冷库无高温库，所以G(qQ2货物放热量由进库的货物的重量决定，根据《冷库设计规范》可知，冻结物冷藏间每日最低进货量为该间冷藏库吨位的5%，本次冷库设计为3000吨水产冷库，由冻结间可知每日冻结量为400吨，共有8间冻结物冷藏间，平均分配，每间冷藏间的进货量为50吨。贮冰间不同于冷藏间，由公式3-6计算得出：Q2表3-6货物放热量Q2计算表库房名称GΔtτΔHBCbQ2冷藏间#11875043.73864009.20.60.421998.9193冷藏间#21875043.73864009.20.60.421998.9193冷藏间#31875043.73864009.20.60.421998.9193冷藏间#41875043.73864009.20.60.421998.9193冷藏间#51875043.73864009.20.60.421998.9193冷藏间#61875043.73864009.20.60.421998.9193冷藏间#71875043.73864009.20.60.421998.9193冷藏间#81875043.73864009.20.60.421998.9193冻结间#92000048.7372000278.70.60.4277420.078冻结间#102000048.7372000278.70.60.4277420.078贮冰间2000001048600合计219431.511.1.3通风换气量Q3本冷库为水产冷库，不含有果蔬等新鲜食物，无呼吸作用，故不需计算Q3a；且本次设计中采用了常温穿堂，故也不存在Q3b。1.1.4电机运行热量Q4电机运行热量Q4计算公式为：Q4本次设计中，冻结物冻结间采用冷风机，冻结物冷藏间采用顶排管，故只用计算两件冻结物冻结间的电机运行热当量即可。冻结间的电机运行热当量计算见表3-7表3-7电机运行热量Q4计算表库房名称∑NξρQ4冻结间#954.61154600冻结间#1054.611546001.1.5操作热量Q5操作热量分为三部分，第一部分是冷库中灯光散发的热量Q5a，第二部分是进出冷库造成冷量损失Q5b，第三部分是工作人员散发的热量Q5=Q表3-8冷间操作热量Q5计算表库房名称qdFVnMnrqrΔhQ5冷藏间#12360180020.5739598.143110.208冷藏间#22360180020.5739598.143110.208冷藏间#32360180020.5739598.143110.208冷藏间#42360180020.5739598.143110.208冷藏间#52360180020.5739598.143110.208冷藏间#62360180020.5739598.143110.208冷藏间#72360180020.5739598.143110.208冷藏间#82360180020.5739598.143110.208贮冰间29045020.5239580.05695.6771合计25577.34冻结间不计此项热量。1.2冷却设备负荷Qq和机械负荷Qj计算：1.2.1冷却设备负荷Qq冷却设备负荷Qq的计算公式为Qq 表3-9库房冷却设备负荷表 库房名称Q1PQ2Q3Q4Q5Qq冷藏间#17546.051998.919003110.20812655.18冷藏间#26470.011998.919003110.20811579.14冷藏间#36470.011998.919003110.20811579.14冷藏间#47546.051998.919003110.20812655.18冷藏间#57546.051998.919003110.20812655.18冷藏间#66470.011998.919003110.20811579.14冷藏间#76470.011998.919003110.20811579.14冷藏间#87546.051998.919003110.20812655.18冻结间#9100646.10546000155246.1冻结间#10100646.10546000155246.1贮冰间4860000695.677149295.68合计456725.11.2.2机器负荷Qj计算计算机械负荷的公式如下：Qj表3-10库房机械负荷Qj计算表库房名称n1Q1n2Q2n3Q3n4Q4n5Q5RQ5-28℃回路冷藏间#17546.05999.461555.101.0710807.657冷藏间#26470.01999.461555.109656.294冷藏间#36470.01999.461555.109656.294冷藏间#47546.05999.4615