Development of Low Temperature Waste Heat Driven Advanced Adsorption Refrigeration System

在一台额定容量为3.5 kW的两级硅胶-水吸附式制冷机上进行了实验，以确定运行条件（水温和水质量流量）对制冷量和COP的影响。热水、冷却水和冷冻水的标准工作温度分别取为55℃、30℃和14 ℃。传热流体入口和出口的实验温度曲线表明，在400 s后，热水和冷却水温度接近其各自的入口温度。这使得我们选择标准吸附/解吸循环时间为420 s。然而，在整个循环中，冷冻水温度继续低于入口温度，这意味着仍然存在冷却能量产生。通过在50和64℃之间改变热水温度进行实验，以确定其对冷却能力和COP的影响。冷却能力随着入口热水温度从50上升到6而上升 ...更多信息 0℃，冷却水为30℃。这是因为，随着驱动源温度的升高，制冷剂的解吸增加，从而制冷剂的循环量增加。随着热水温度的变化，COP峰值在55 ~ 58℃之间，表明该温度范围是冷水机组有效运行的理想温度范围。对不同热沉温度下的制冷量和COP变化进行了实验研究。冷却能力和COP都随着冷却水温度的降低而增加。这种趋势反映了这样的事实，即较低的吸附温度导致较大量的制冷剂被吸附。实验结果表明，冷水入口温度的变化，制冷量和COP线性增加。但是输送的冷冻水温度也随着冷冻水入口温度的增加而增加。实验还进行了不同的热水，冷却水和冷冻水流量的冷却能力和COP的变化。实验数据表明，在研究范围内，随着热水、冷水和冷冻水流量的增加，冷却能力稳步增加。COP也有类似的制冷量变化趋势。实验结果表明，先进的双级冷水机组适合于利用低温热源（约55℃）作为驱动源，冷源为30℃。通过使用两级冷却器，克服了在操作具有如此小的再生温度升程（驱动源和散热器之间的温度差）的循环中固有的技术困难。少

Experiments were conducted on a 3.5 kW rated capacity two-stage, advanced silica gel-water adsorption chiller to determine the influence of operating conditions (water temperatures and water mass flow rates) on cooling capacity and COP. The standard operating temperatures for hot, cooling and chilled water are respectively taken as 55℃, 30℃ and14℃. Experimental temperature profiles of the heat transfer fluid inlets and outlets showed that after 400 s, the hot and the cooling water temperatures approach their respective inlet temperatures. This led us to select the standard adsorption/desorption cycle time as 420 s. The chilled water temperature, however, continues to be lower than the inlet temperature in the whole cycle, which means that there is still cooling energy production. Experiments were performed by varying hot water temperatures between 50 and 64℃ to determine its effect on cooling capacity and COP. Cooling capacity rises as the inlet hot water temperature rises from 50 to 6 … More 0℃ with a cooling water at 30℃. This is because the amount of refrigerant circulation increases due to increased refrigerant desorption with higher driving source temperatures. With hot water temperature variation, the COP peaks between 55 and 58℃ shows that this temperature range is ideal for the chiller to operate effectively. Experiments were conducted on cooling capacity and COP variations with various heat sink temperatures. Both cooling capacity and COP increase with lower cooling water temperatures. This tendency reflects the facts that lower adsorption temperature result in larger amounts of refrigerant being adsorbed. Experimental results for chilled water temperature variations showed that cooling capacity and COP increase linearly with increasing chilled water inlet temperatures. But the delivered chilled water temperature also increases with increasing chilled water inlet temperatures. Experiments were also performed on cooling capacity and COP variations with various flow rates of hot water, cooling water and chilled water. Experimental data indicate that cooling capacity increases steadily with the increase of hot, cooling and chilled water flow rates in the range studied. COP also has the similar tendency of cooling capacity. From the experimental evidence it can be concluded that the advanced two-stage chiller is well suited to utilize low-temperature thermal heat (〜55℃) as the driving source with a cooling source of 30℃. The technological difficulty inherent in operating a cycle with such a small regenerating temperature lift (temperature difference between driving source and sink) is overcome by use of a two-stage chiller. Less