Determination of the optimum high pressure for transcritical CO2-refrigeration cycles

被引:242
|
作者
Kauf, F [1 ]
机构
[1] Daimler Benz AG, D-70546 Stuttgart, Germany
关键词
compression system; air-conditioning; ecological; refrigerant; carbon dioxide; transcritical; overcritical; coefficient of performance; high pressure; control;
D O I
10.1016/S1290-0729(99)80098-2
中图分类号
O414.1 [热力学];
学科分类号
摘要
Modern refrigeration systems have to fulfil many requirements, which include a rapidly growing number of environmental aspects. For compression systems, this entails demands for low energy for propulsion of the systems and a high coefficient of performance (COP) respectively. Compression systems using the ecological refrigerant carbon dioxide (CO2) are often run at transcritical conditions. This means that the evaporation of the refrigerant takes place at subcritical conditions, whereas the heat rejection into the environment occurs at supercritical pressures and temperatures. For such transcritical CO2-systems with the main components compressor, gas cooler, expansion unit and evaporator, a maximum COP exists, depending on system, environmental conditions and operating conditions. The COP is influenced mainly by high pressure. A graphical method from the literature to determine the optimum high pressure is too time-consuming if several operating conditions are investigated. With a simulation model, the optimum high pressure can easily be determined for different operating conditions as a function of the refrigerant temperature at the gas cooler outlet. With these data it is possible to determine a control function. This function is used to adjust the high pressure so that the system can be run with a COP that deviates from the maximum values by less than 5.8 %. (C) Elsevier, Paris.
引用
收藏
页码:325 / 330
页数:6
相关论文
共 50 条
  • [1] The optimum discharge pressure of CO2-based refrigeration cycles operating under subcritical and transcritical conditions
    Sharma D.K.
    Hazarika M.M.
    Ramgopal M.
    International Journal of Ambient Energy, 2023, 44 (01) : 1232 - 1242
  • [2] The optimum high pressure for CO2 transcritical refrigeration systems with internal heat exchangers
    Chen, Y
    Gu, JJ
    INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, 2005, 28 (08): : 1238 - 1249
  • [3] THE OPTIMUM GAS COOLER PRESSURE FOR TRANSCRITICAL CO2 REFRIGERATION CYCLE: A NEW CORRELATION
    Oezguer, Arif Emre
    Bayrakci, Hilmi Cenk
    Akdag, Ali Ekrem
    ISI BILIMI VE TEKNIGI DERGISI-JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY, 2009, 29 (02) : 23 - 28
  • [4] ENERGETIC AND EXERGETIC STUDIES OF MODIFIED CO2 TRANSCRITICAL REFRIGERATION CYCLES
    Shet, Shrikant
    Patil, Omprakash
    Agrawal, Neeraj
    12TH IIR GUSTAV LORENTZEN NATURAL WORKING FLUIDS CONFERENCE, 2016, : 186 - 193
  • [5] Experimental determination of the optimum working conditions of a transcritical CO2 refrigeration plant with integrated mechanical subcooling
    Nebot-Andres, Laura
    Catalan-Gil, Jesus
    Sanchez, Daniel
    Calleja-Anta, Daniel
    Cabello, Ramon
    Llopis, Rodrigo
    INTERNATIONAL JOURNAL OF REFRIGERATION, 2020, 113 : 266 - 275
  • [6] An Advanced Exergoeconomic Comparison of CO2-Based Transcritical Refrigeration Cycles
    Belman-Flores, J. M.
    Rangel-Hernandez, V. H.
    Perez-Garcia, V
    Zaleta-Aguilar, A.
    Fang, Qingping
    Mendez-Mendez, D.
    ENERGIES, 2020, 13 (23)
  • [7] Energetic and exergetic studies of modified CO2 transcritical refrigeration cycles
    Patil, Omprakash S.
    Shet, Shrikant A.
    Jadhao, Manish
    Agrawal, Neeraj
    INTERNATIONAL JOURNAL OF LOW-CARBON TECHNOLOGIES, 2021, 16 (01) : 171 - 180
  • [8] Identification of optimum inter-stage pressure for two-stage transcritical carbon dioxide refrigeration cycles
    Srinivasan, K.
    JOURNAL OF SUPERCRITICAL FLUIDS, 2011, 58 (01): : 26 - 30
  • [9] Energy analysis and performance comparison of transcritical CO2 supermarket refrigeration cycles
    Caliskan, Oguz
    Ersoy, H. Kursad
    JOURNAL OF SUPERCRITICAL FLUIDS, 2022, 189
  • [10] Decoupling Control for Sub- and Transcritical Operation of CO2 Refrigeration Cycles
    Noeding, Michael
    Tegethoff, Wilhelm
    Koehler, Juergen
    2018 IEEE CONFERENCE ON CONTROL TECHNOLOGY AND APPLICATIONS (CCTA), 2018, : 820 - 825