A general distributed-parameter model for thermal performance of cold box with parallel plate-fin heat exchangers based on graph theory

2019 ◽  
Vol 148 ◽  
pp. 478-490 ◽  
Author(s):  
Haoran Sun ◽  
Haitao Hu ◽  
Guoliang Ding ◽  
Hui Chen ◽  
Zhigang Zhang ◽  
...  
Keyword(s):  
Graph Theory ◽  
Thermal Performance ◽  
Heat Exchangers ◽  
Parallel Plate ◽  
Distributed Parameter ◽  
Distributed Parameter Model ◽  
Cold Box

scholarly journals Influence of heat in-leak, longitudinal conduction and property variations on the performance of cryogenic plate-fin heat exchangers based on distributed parameter model

2019 ◽  
Vol 23 (3 Part B) ◽  
pp. 1969-1979
Author(s):  
Qingfeng Jiang ◽  
Ming Zhuang ◽  
Zhigang Zhu ◽  
Linhai Sheng ◽  
Ping Zhu
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Design Theory ◽  
Heat Transfer Performance ◽  
Design Procedure ◽  
Distributed Parameter ◽  
Governing Equations ◽  
Distributed Parameter Model ◽  
Fluid Properties ◽  
Performance Deterioration

For helium liquefaction/refrigeration systems, conventional design theory always fails in cryogenic applications and heat exchangers operating at low temperatures are usually sensitive to longitudinal heat conduction, heat in-leak from surroundings and variable fluid properties. Governing equations based on distributed parameter methods are developed to evaluate performance deterioration caused by these effects. The model synthetically considering these loss mechanisms is validated against experimental data and design results obtained by commercial software Aspen MUSETM. Sample multistream heat exchangers are further studied to discuss quantitative effects of these heat losses. In accordance with previous researches, the comprehensive effects of various losses are analyzed qualitatively in order to reveal their influences and investigate on the strategies of improving the heat transfer performance. The numerical method is useful in the design procedure of cryogenic heat exchangers and can be adopted to predict heat transfer and pressure drop performance under the actual low temperature environment.

Analysis of Air Source Heat-Pump System Assisted by Solar Energy

2012 ◽  
Vol 516-517 ◽  
pp. 257-260
Author(s):  
Shun Yu Su ◽  
Qin Huang ◽  
Jian Chen
Keyword(s):  
Solar Energy ◽  
Heat Pump ◽  
Heat Exchangers ◽  
Distributed Parameter ◽  
Pump System ◽  
Operating Condition ◽  
Heat Pump System ◽  
Air Source Heat Pump ◽  
Distributed Parameter Model ◽  
Refrigerant Charge Quantity

The steady state distributed parameter model of heat exchangers in a heat-pump system was established in this paper. The calculating results of refrigerant quantities in the heat-exchangers show that refrigerant charge quantity in heating operating condition is less than that in refrigeration operating condition. Based on the differences of refrigerant mass flux between refrigeration and heating conditions, the exhaust bypass method to improve the operation efficiency of the heat-pump system was presented. And in order to prevent frosting on the surface of outdoor heat exchanger of the air source heat-pump, the solar energy assisted strategy was also applied in the heat-pump system.

A distributed parameter model for multi-row separated heat pipe with micro-channel heat exchangers

2021 ◽  
Vol 182 ◽  
pp. 116113
Author(s):  
Guanghui Xia ◽  
Dawei Zhuang ◽  
Guoliang Ding ◽  
Jingchao Lu ◽  
Weizhe Han ◽  
...  
Keyword(s):  
Heat Pipe ◽  
Heat Exchangers ◽  
Distributed Parameter ◽  
Micro Channel ◽  
Distributed Parameter Model

A distributed-parameter model for LNG spiral wound heat exchanger based on graph theory

2015 ◽  
Vol 81 ◽  
pp. 102-113 ◽  
Author(s):  
Tingting Wang ◽  
Guoliang Ding ◽  
Zhongdi Duan ◽  
Tao Ren ◽  
Jie Chen ◽  
...  
Keyword(s):  
Graph Theory ◽  
Heat Exchanger ◽  
Distributed Parameter ◽  
Distributed Parameter Model ◽  
Spiral Wound

scholarly journals Experimental Investigation and Comparison of the Thermal Performance of Additively and Conventionally Manufactured Heat Exchangers

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 574
Author(s):  
Ana Vafadar ◽  
Ferdinando Guzzomi ◽  
Kevin Hayward
Keyword(s):  
Surface Roughness ◽  
Thermal Performance ◽  
Heat Exchangers ◽  
High Efficiency ◽  
Cooling System ◽  
Fluid Dynamic ◽  
Dynamic Performance ◽  
Experimental Studies ◽  
Manufacturing Method ◽  
Industrial Sectors

Air heat exchangers (HXs) are applicable in many industrial sectors because they offer a simple, reliable, and cost-effective cooling system. Additive manufacturing (AM) systems have significant potential in the construction of high-efficiency, lightweight HXs; however, HXs still mainly rely on conventional manufacturing (CM) systems such as milling, and brazing. This is due to the fact that little is known regarding the effects of AM on the performance of AM fabricated HXs. In this research, three air HXs comprising of a single fin fabricated from stainless steel 316 L using AM and CM methods—i.e., the HXs were fabricated by both direct metal printing and milling. To evaluate the fabricated HXs, microstructure images of the HXs were investigated, and the surface roughness of the samples was measured. Furthermore, an experimental test rig was designed and manufactured to conduct the experimental studies, and the thermal performance was investigated using four characteristics: heat transfer coefficient, Nusselt number, thermal fluid dynamic performance, and friction factor. The results showed that the manufacturing method has a considerable effect on the HX thermal performance. Furthermore, the surface roughness and distribution, and quantity of internal voids, which might be created during and after the printing process, affect the performance of HXs.

Sign in / Sign up

Export Citation Format

Share Document