水平微圆管内R22和R410a凝结压降的实验研究.pdfVIP

蹦．28。^rD．3 第瑟考≮嚣期 水平微圆管内R22和尺410a凝结压降的实验研究 ．，妇．2007 水平微圆管内R22和R410a凝结压降的实验研究+ 张会勇李俊明王补宣 (清华大学热能工程系北京100084) 饱和温度为40℃、质量流速为200～1000W矗·s、干度为0．2～O．8时的凝结压降特性。实验结果表明：凝结压降随 着质量流速的增大而增大，在较高干度时更加明显。与R22相比，R410a的凝结压降在较低干度和质量流速时与R22 相当，在较高干度和较高质量流速时明显低于R22。 关键词工程热物理；压降；微圆管；凝结；实验研究 r_mentaI OnPn≥ssureofR22andR410adu Expe lnVeStigatiOn DrOp r．ng in CbndensingPn3ceSSMiCr0『IubeS Bu)(uan zhangHuiyong霄，LIJunming，、~ang ofThenllaI ☆Depar旷nent Engineemg，TsinghuaUnivers时，Beijing，100084，China Abst限cfR410ais|(no＼^，nasOneofthesubstitutesforR22anditjs tO the ofF{410adu卜 impOrcantstudypressuredrop testwasestablishedtomeasure inmicroscaJeandcharader．sticsof ing∞ndensingprocesses．Arig pressuredrop pre— ssure 0fR：挖andfⅥ10ainahOrizOntaIstainIessrOundtubewithan of0．941nlm drOp innerdianleter du—ngcOndensing were atthe∞turation of40℃．Themassfluxvariedwithinthe procesSesinvestigatedexperimentaI|y tempe阳ture range of sandthe 200一1000 0．2一O．8．The resuItsindicatethat increaseswith kg／m2 vaporqua¨ty experiment pressuredrop massfluxand andmore in ofR410ais to negion．The equiValent vapOrquaIIty obviousIyhighvaporqua|ity pressuredrop of thatR：z2atlaw andmassfluxbutobviousla＼^／erthanthatoff：℃22at andmassfJux． vaporquaI