|
Ammonia diffusion - absorption heat pump system is simple , with no moving parts , can take advantage of direct gas , waste heat or solar - driven , its important performance study . This study is focused in the following four aspects : first , by the experimental method , the relationship between the study thermal siphon pump to enhance the amount of VL with the amount of steam VG , using data regression fit obtained VL and VG relational model VL = 0.0205VG 0.0691, the correlation of 0.9707 ; based on the conservation of mass , energy conservation , and ammonia - water model to construct a thermal model of the diffusion absorption heat pump system . Second, build a water-cooled experimental platform of diffusion absorption heat pump system thermal model analysis of the specific working conditions , input power , filling concentration , absorption temperature , filling pressure , condensing temperature of the system cooling and heating the impact of the performance ; the results show that : the prototype optimal input power is 240W, the refrigeration coefficient 0.253 , heating coefficient 1.19 ; most suitable for filling concentration is influenced by the absorption temperature , the absorption temperature of 36 ° C , 45 ° C , 51 ° C the most suitable concentration were : 0.40,0.35 and 0.28 ; filling pressures enhance from 1.8MPa to 2.4MPa , the prototype of 39.3% increase in the start-up time ; research shows that there exists a critical the absorption temperature value , the absorption temperature is increased impact on performance compared to small , filling a concentration of 0.30 and 0.40 , its critical temperature at about 45 ℃ ; condensation temperature , decreased efficiency of the system , the condensation temperature was increased to 53 ° C from 47 ℃ , refrigerating capacity is decreased 10W, a decrease of 16% . Third, combined with practical application to different ambient temperature , the influence of process parameters on the system ; 4 sets of the same structure as the XCD-120 diffusion absorption heat pump chiller , the average annual temperature in the region below 20 ℃ , the optimal irrigation loading levels , input power , filling pressure : 0.35,120 W , 1.6MPa ; annual average temperature between 20 ℃ ~ 25 ℃ , the optimal value of the three were : 0.30,150 W , 2.0 MPa ; for areas with ambient temperature exceeds 30 ° C : the optimal value for 0.25,150 W , 2.2 MPa . Fourth , design , processing a 1200W diffusion absorption heat pump heating machine , through a preliminary study on the performance of its heating experiment , when the input power is 750W to 1500W heating efficiency of 1.05 to 1.11 .
|