Evaluation of performance an air conditioning systems using t-junction flash gas refrigerant
The purpose of this study was to determine the performance of air-cooled chiller system using T-junction flash gas bypass refrigerant. The experiment was conducted by installing T-junction after expansion device to separate the phase of refrigerant liquid and gas which flows to the evaporator. The working fluid is used as a cooling medium is R-290. To get performance data, measurements performed at the time of steady state when the water chilling temperature T = 15 C up to T = 10 C and flow rates kept constant at 1 GPM (6.3 x 10-5 m3/s). Finally, the use of T-junction mode in AC system generates an increase in the refrigerating effect and coefficient of performance systems (CoP) by 6% and 17.8 %, respectively. Also, it can decrease the heat of compression by 8.5%. This has implications for the lighter compressor work and saving the power consumption of the AC system.
State-of-art of impacting T-junction : Phase separation, constituent separation and applications
Abstract Because of the simple structure and low cost, T-junction is used extensively as a separation component in energy and chemical systems to lift system efficiency. Recently, it is found that T-junction can also be used for constituent separation of zeotropic mixtures, which can further improve the system efficiency. The phase distribution in T-junction is a complex phenomena due to the complicated influencing factors. To get a clearer understanding about it, this paper firstly gives a comprehensive review on the current experimental progress of impacting T-junction. The effects of all kinds of parameters on phase distribution are investigated thoroughly. Secondly, the theoretical prediction models on phase separation are summarized. Then, the latest research on constituent separation is summarized. This paper concludes that the distribution of constituent separation is based on phase separation. But the research on constituent distribution is extremely limited. Finally, the working principle and specific function of T-junction in some new concept configuration are illustrated by concrete examples enumeratively.
ANALYSIS OF BOLT′S ANCHORING QUALITY BASED ON WAVELET NEURAL NETWORK
The dynamic response of bolt achieved by impact-echo method can be effected easily by some factors.It′s difficult to classify bolt′s anchoring quality according to the dynamic response of bolt.In this paper,a new analytical method of bolt′s dynamic response is put forward.The new analytical method combing with advantages of wavelet analysis and artificial neural network is presented.Firstly,the dynamic response of bolt by numerical simulation software FLAC3D is obtained.Secondlyt,he features are extracted from the dynamic response of bolt by wavelet analysis.Thirdlyt,hese features are fed into the artificial neural network for training.Finallyt,his artificial neural network to classify the bolt′s anchoring quality intelligent according to the dynamic response of bolt is employed.In order to validate this new analytical method,some practical signals of bolt′s dynamic response are used for the test.The results indicate that the new analytical method is practicable.