http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : R. N. N. Koury (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
Distributed and Nonsteady-State Model of an Air Cooler Working with R22 and R410A
R. O. Nunes,L. F. N. Castro,L. Machado,R. N. N. Koury 대한설비공학회 2016 International Journal of Air-Conditioning and Refr Vol.24 No.2
The restrictions imposed by Montreal Protocol for use of CFCs fluids and Kyoto Protocol to HCFCs have motivated researchers and the industry to seek new alternatives. Within this context, R410A has emerged as one of the most likely replacement of R22. The purpose of this work is to develop a numerical model of an air cooler to simulate its behavior operating under dynamic conditions loaded with R22 or R410A refrigerant. The model divides the air cooler in volumes control in which mass, energy, and momentum balance equations are applied and solved. Theoretical data obtained by model simulations repeated tendencies observed in experimental data taken from literature. Model simulations have also shown that for a step change in the inlet refrigerant mass flow, the superheating response of air cooler is almost the same when it is working with R22 or R410A refrigerant.
-
Adiabatic Capillary Tube Model for a Carbon Dioxide Transcritical Cycle
R. O. Nunes,R. N. Faria,N. Bouzidi,L. Machado,R. N. N. Koury 대한설비공학회 2015 International Journal Of Air-Conditioning and Refr Vol.23 No.2
This paper presents a mathematical model for a capillary tube using CO2 as fluid in steady flow transcritical cycle. The capillary tube is divided into N volumes controls and the model is based on applying the equations of conservation of energy, mass and momentum in the fluid in each of these volumes controls. The model calculates the mass flow of the CO2 in the capillary tube as a function of CO2 pressures at the inlet and outlet of the capillary and the temperature of CO2 at the input of this device. The capillary tube is considered to be adiabatic, and the limit of operation due to blocked flow condition is also considered in the model. The validation of the model was performed with experimental data and the results showed that the model is capable of predicting the mass flow in the capillary tube with errors less than 10%. The model was also used to determine the minimum diameter of the capillary tube for various conditions of CO2 transcritical cycle.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
