利用搭建的ORC余热发电测试系统,实验研究了冷却水温度对ORC系统性能的影响。结果表明:当热源温度不变时,随着冷却水温度的升高,冷凝压力增加,蒸发压力稍有增加,冷凝器和蒸发器的负荷减小,膨胀机的压差和压比减小,系统的输出电功和热效...利用搭建的ORC余热发电测试系统,实验研究了冷却水温度对ORC系统性能的影响。结果表明:当热源温度不变时,随着冷却水温度的升高,冷凝压力增加,蒸发压力稍有增加,冷凝器和蒸发器的负荷减小,膨胀机的压差和压比减小,系统的输出电功和热效率降低。在实验测试范围内,当冷却水温度从21.82℃升至42.10℃时,输出电功从2.357 k W降至1.535 k W,热效率从7.25%降至5.76%,输出电功与热效率分别降低34.87%和23.86%。也意味着在此工况范围内,冷却水温度每升高1℃,系统输出电功降低0.0411 k W和1.74%。通过研究冷源温度对ORC系统性能的影响,为今后结合当地气候因素设计冷源系统和优化系统性能提供重要的实验依据。展开更多
After subjecting the seeds to GA3 and H2O2 treatments for 24 h and chilling at 2-3℃ for a period of 15 days, we conducted the seed germination tests for 21 different seed sources ofPinns roxburghii from western-centr...After subjecting the seeds to GA3 and H2O2 treatments for 24 h and chilling at 2-3℃ for a period of 15 days, we conducted the seed germination tests for 21 different seed sources ofPinns roxburghii from western-central Himalaya under laboratory conditions at various temperatures viz., 20℃, 25℃ and 30℃ inside a seed germinator. The results reveal that the soaking of seeds in H2O2 （1% v/v） and GA3 （ 10 mg.L^-1） solutions manifested 82.39% and 78.19% germination, respectively whereas untreated seeds exhibited 70.79% average germination. Both GA3 and H2O2 treatments caused an appreciable shortening of the germination period by 8 days and 10 days, respectively. Moist-chilling did improve the rate and percentage of germination when germinated at 20℃ over 21 days; however total germination was not affected at temperatures 25℃ and 30℃, Although the seeds of P. roxburghii germinate well due to lack of dor- mancy, the increasing demand for large quantities of seeds of P. roxburghii for reforestation programmes make pre-sowing treatments useful in improving the rate and percentage of gemaination.展开更多
文摘利用搭建的ORC余热发电测试系统,实验研究了冷却水温度对ORC系统性能的影响。结果表明:当热源温度不变时,随着冷却水温度的升高,冷凝压力增加,蒸发压力稍有增加,冷凝器和蒸发器的负荷减小,膨胀机的压差和压比减小,系统的输出电功和热效率降低。在实验测试范围内,当冷却水温度从21.82℃升至42.10℃时,输出电功从2.357 k W降至1.535 k W,热效率从7.25%降至5.76%,输出电功与热效率分别降低34.87%和23.86%。也意味着在此工况范围内,冷却水温度每升高1℃,系统输出电功降低0.0411 k W和1.74%。通过研究冷源温度对ORC系统性能的影响,为今后结合当地气候因素设计冷源系统和优化系统性能提供重要的实验依据。
基金suportted by the Indian Council of Forestry Research and Education (ICFRE) Dehradun
文摘After subjecting the seeds to GA3 and H2O2 treatments for 24 h and chilling at 2-3℃ for a period of 15 days, we conducted the seed germination tests for 21 different seed sources ofPinns roxburghii from western-central Himalaya under laboratory conditions at various temperatures viz., 20℃, 25℃ and 30℃ inside a seed germinator. The results reveal that the soaking of seeds in H2O2 （1% v/v） and GA3 （ 10 mg.L^-1） solutions manifested 82.39% and 78.19% germination, respectively whereas untreated seeds exhibited 70.79% average germination. Both GA3 and H2O2 treatments caused an appreciable shortening of the germination period by 8 days and 10 days, respectively. Moist-chilling did improve the rate and percentage of germination when germinated at 20℃ over 21 days; however total germination was not affected at temperatures 25℃ and 30℃, Although the seeds of P. roxburghii germinate well due to lack of dor- mancy, the increasing demand for large quantities of seeds of P. roxburghii for reforestation programmes make pre-sowing treatments useful in improving the rate and percentage of gemaination.
