Article
Thermodynamics
Tao Bai, Dawei Li, Hongxu Xie, Gang Yan, Jianlin Yu
Summary: This study demonstrated the feasibility of using a natural binary mixture of ethane/propane for refrigeration in a low-temperature freezer, with the concentration of the mixture significantly impacting system performance. Reducing the operating pressure and compression ratio could be possible directions to improve the performance of the low-temperature Joule-Thomson refrigerator working with R170/R290.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Haishan Cao, Chia-hsin Wang, Limin Qi, Dongli Liu, Qinghang Meng
Summary: This study experimentally investigates the performance of JT microcoolers operating with different working fluids and discusses the effects of heat load and mass flow rate on temperature stability. The results show that the microcooler operating with a nitrogen/ethylene mixture demonstrates the best temperature stability.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Tao Bai, Hongxu Xie, Dawei Li, Gang Yan, Jianlin Yu
Summary: This study investigates the start-up characteristics of a mixture-based Joule-Thomson (J-T) refrigeration system with an expansion tank for pressure control. The results demonstrate that the expansion tank can effectively limit the discharge pressure and the pull-down rate is influenced by the control pressure, throttle valve opening, compressor speed, and mixture concentration.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Jiarui Liu, Ye Liu, Jianlin Yu, Gang Yan
Summary: This paper proposes a novel vapor-injection Joule-Thomson refrigeration cycle with mixed-refrigerant. The introduction of the compressor with vapor-injection can reduce the pressure ratio of each compression stage, thus reducing the compressor power and discharge temperature. The thermodynamic analysis results show that the performance of the novel cycle is better than that of the basic Joule-Thomson cycle.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
I. A. Burkov, A. Pushkarev, S. S. Ryabikin, A. Shakurov, D. Tsiganov, A. A. Zherdev
Summary: This paper discusses major methodological problems in improving cryosurgical equipment and procedures, proposing solutions such as modifying the cryoprobe operating mode. Numerical results show that the target isotherm location is minimally affected by the moisture content of soft biotissue, which is not a limiting factor for predicting cryoexposure.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2022)
Article
Thermodynamics
E. G. Bychkov
Summary: This article discusses the optimal weight of mixed-refrigerant charge for single and multi-stage Joule-Thompson refrigerators operating with natural nitrogen-hydrocarbon mixtures, and presents an analytical method and experimental results. The accuracy of the method depends on calculating thermodynamic properties of mixed refrigerants and considering the shift of circulating composition due to real refrigerators' structural specifics. Using this method can reduce the time and cost of experimental development of new refrigeration equipment.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Thermodynamics
Yunxiao Wang, Yanxing Zhao, Yuwei Sun, Haocheng Wang, Hao Guo, Maoqiong Gong
Summary: Mixed-refrigerant Joule-Thomson refrigeration is widely used and effective for refrigeration in the temperature range of 80-230 K. Optimizing the composition of the mixed refrigerant is essential for determining the refrigeration temperature and capacity. This study proposes an alternative optimization method based on the effective refrigeration effect to overcome challenges associated with complex algorithms typically used in optimizing mixed refrigerants.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Yunxiao Wang, Haocheng Wang, Yanxing Zhao, Maoqiong Gong, Kun Wang, Hao Guo
Summary: A mixed refrigerant optimization method based on the effective refrigeration effect is proposed in this study, which can be used for cooling distributed-temperature heat loads. By optimizing to make the equivalent enthalpy close to zero, the performance of the refrigeration cycle can be improved. In specific applications, this method has increased the exergy efficiencies in different systems.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2023)
Article
Environmental Sciences
Massaud Mostafa, M. Ezzeldien, M. Attalla, Nouby M. Ghazaly, Z. A. Alrowaili, M. F. Hasaneen, Ahmed N. Shmroukh
Summary: The study tested new adsorption pairs to improve the performance of solar adsorption ice-maker, with Maxsorb III/R-511A pair showing the best results. Additionally, adsorption refrigeration technology shows potential for application in food and vaccine preservation and storage in the hot climate of Upper Egypt.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Thermodynamics
Zhicheng Pan, Xiaoyong Li, Ling Wang, Taihe Huang, Xiaoqing Zhang, Jianjun Ye, Jianye Chen
Summary: In this study, a conical Hampson J-T cryocooler was designed and fabricated, and its performance was tested using an experimental setup. The cooling capacity, heat transfer coefficient, and efficiency of the cryocooler were analyzed based on experimental data. The results showed that using nitrogen gas as the working fluid at an inlet pressure of 10 MPa, a minimum cooling temperature of 168 K with a cooling capacity of 393.5mW can be achieved. The efficiency of the cryocooler was found to be around 80%.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Qi Chen, Yinsong Li
Summary: This study presents the experimental investigation of an zeotropic mixture separation condensation-based dual-temperature refrigeration cycle using R290/R600a as the refrigerant. The cyclic operation characteristics of the refrigeration system under on-off periodic operation mode are explored, and the influence of different factors such as refrigerant charge, refrigerant mass fraction, throttling valve opening, and ambient temperature are evaluated. The results show that the compressor average power and duty cycle are affected by the refrigerant charge, R600a-charged concentration, and freezer valve opening. The study also demonstrates that the minimum energy consumption is achieved at specific parameter values. Additionally, a higher ambient temperature affects the heat transfer, compressor duty cycle, and daily power consumption.
Article
Energy & Fuels
Mohammad Shamsi, Saman Farokhi, Mohammad Pourghafari, Ahmad Bayat
Summary: In this study, the methods of Joule-Thomson and mechanical refrigeration were analyzed for adjusting the dew point of natural gas. The results showed that mechanical refrigeration had better performance in terms of energy efficiency and gas condensate production, while the quality of hydrocarbons dew point in the produced gas was lower compared to Joule-Thomson. However, in terms of exergy analysis, mechanical refrigeration had higher efficiency and lower exergy destruction rate.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Thermodynamics
Zhichao Chen, Xiaoyu Cui, Shaoshuai Liu, Yinong Wu, Zhenhua Jiang, Lei Ding
Summary: For quantum communications, single-photon detection, millimeter wave detection, and other space projects, achieving excellent performance requires working at liquid helium temperatures. The closed-cycle helium Joule-Thomson cryocooler (JTC) is a mainstream solution for achieving liquid helium temperature. Strict temperature fluctuation requirements for JTC are necessary, as thermal noise caused by JTC temperature fluctuation impacts detection performance critically. Changes in the precooler have the most significant influence on JTC temperature, particularly the secondary precooling temperature (T-pre2). Increasing the buffer tank volume (V-b) of the JT compressor effectively reduces JTC temperature fluctuation caused by precooler temperature change.
JOURNAL OF THERMAL SCIENCE
(2023)
Article
Thermodynamics
Limin Qi, Dongli Liu, Xiao Liu, Haiyue Pei, Ding Zhao, Haishan Cao, Min Qiu
Summary: Thermal management is crucial for electronic devices to remain within their temperature limits. Micromachined Joule-Thomson (JT) coolers, which reduce temperature fluctuations, show promise for achieving this. In this study, the cooling power of a micromachined JT cooler was examined using nitrogen. By applying high and low pressures, the cooler successfully cooled from room temperature to 88.5 K in 30 minutes. The study introduces a general method for evaluating the cooling performance and discusses the relationship between performance and heat load.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Mengqi Yu, Ye Liu, Jianlin Yu
Summary: In this paper, a modified ejector enhanced Joule-Thomson cycle (EJTC) with binary mixture R1150/R600a was proposed for -80 degrees C low temperature freezer applications. The cycle improved the performance by using the ejector as an expansion device and eliminating the need for a vapor-liquid separator. The results showed significant improvements in COP and volumetric refrigeration capacity compared to a basic Joule-Thomson cycle (BJTC), especially at lower evaporating temperatures.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Review
Thermodynamics
Shuling Guo, Ankuo Zhang
Summary: Low-temperature biopreservation is commonly used for medication storage to prolong their shelf life. However, cryo-injury can occur during cryopreservation, making it crucial to find a way to achieve long-term biopreservation without causing harm. The optimal storage temperature for different biomaterials should be investigated to improve storage efficiency. This review discusses the mechanisms of cryo-injury and biopreservation, as well as the reasons for storing biological tissues at various temperature zones. It provides valuable insights for the development of biostorage technology.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
M. Mohsin Tanveer, Craig R. Bradshaw, Joe Orosz, Greg Kemp
Summary: This study investigates the optimal geometric parameters for a spool compressor using simulation models, and the results indicate that a eccentricity ratio of 0.75 and L/D ratios between 1-1.5 can maximize the volumetric and isentropic efficiencies.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Kongkuai Ying, Zhenhua Jiang, Wenting Wu, Jinjian Chu, Shaoshuai Liu, Yinong Wu
Summary: The Stirling/pulse tube cryocooler (SPC) is a highly efficient and long-lasting cryocooler for space applications. It has the ability to adjust the inter-stage refrigeration capacity dynamically by controlling the Stirling displacer in the first stage. This paper proposes an SPC with a second-stage active phase shifter (APS) that can control the phase difference at the second-stage hot end in real time. The experimental results show that the SPC with the APS can provide refrigeration capacity at different temperatures, with a minimum temperature of 13.5K.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Ligeng Li, Hua Tian, Kai Liu, Yibo Wu, Xuan Wang, Xingyu Liang, Gequn Shu
Summary: This study focuses on improving the performance of carbon dioxide refrigeration systems by introducing a multi-ejector design with three controllable ejectors. Experimental analysis shows that the system's performance can be significantly improved by adopting an optimum pressure control strategy under different operating conditions.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Joseph Al Khoury, Rabih Al Haddad, Ghiwa Shakrina, Christelle Bou Malham, Haytham Sayah, Chakib Bouallou, Maroun Nemer
Summary: This study investigates two implementation methods for calculating refrigerant thermodynamic properties and compares their performance. The results show that the implicit fitting method significantly speeds up simulation time and offers greater flexibility for modeling complex energy systems.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Mariella Mateo-Villanueva, Rodolfo Echarri
Summary: This article details three models of different complexity levels for predicting the cold production of a solar cooling device and compares their advantages and disadvantages. The results show that the transient model underestimates the cold generation, while the equilibrium model and universal model overestimate it. The transient model is a useful tool for analyzing the impact of different variables in a solar adsorption refrigeration system, while the simpler models can be used for preliminary design and feasibility studies.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
Article
Thermodynamics
Amin M. Elsafi, Majid Bahrami
Summary: The novel spherical micro-absorbers offer high sorption capacity and surface-to-volume ratios, solving issues such as solution carryover and corrosion associated with conventional absorbers.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2024)
