Chongfang Ma
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View article: Theoretical and Experimental Research on Thermal Dynamic Characteristics of Single-Screw Compressor with a New Composite SLIDE Valve
Theoretical and Experimental Research on Thermal Dynamic Characteristics of Single-Screw Compressor with a New Composite SLIDE Valve Open
Based on the single-screw compressor (SSC) structure, a new type of composite slide valve (CSV) has been proposed and designed, featuring internal volume ratios of 2.8, 3.9, and 5.6 and operating under a partial load of 35%. The theoretica…
View article: Numerical simulation of the influence of different heating directions on charging performance of the cubic combined sensible-latent heat storage structure
Numerical simulation of the influence of different heating directions on charging performance of the cubic combined sensible-latent heat storage structure Open
The sensible and latent heat storage system (CSLHS) has become a research hotspot. In this paper, we construct a thermal storage unit structure by using the method of cubic macro-encapsulation, and its charging performance is simulated by …
View article: Advances in High-Temperature Molten Salt-Based Carbon Nanofluid Research
Advances in High-Temperature Molten Salt-Based Carbon Nanofluid Research Open
Molten salt is an excellent medium for heat transfer and storage. The unique microstructure of carbon nanomaterials leads to good mechanical stability, low density, high thermal conductivity, and high strength, etc. The addition of carbon …
View article: Thermodynamic Analysis and Optimization Design of a Molten Salt–Supercritical CO2 Heat Exchanger
Thermodynamic Analysis and Optimization Design of a Molten Salt–Supercritical CO2 Heat Exchanger Open
The performance of a heat exchanger is directly related to the energy conversion efficiency of the thermal storage system, and its optimal design is an important method to improve the performance of the heat exchanger. This paper uses the …
View article: Insights into the Enhancement Mechanisms of Molten Salt Nanofluids
Insights into the Enhancement Mechanisms of Molten Salt Nanofluids Open
The addition of nanomaterials to molten salts can significantly improve their thermal performance. To explore the enhancement mechanisms, this work prepared carbonate salt nanofluids with binary carbonate as base salt and 20 nm SiO2 and 20…
View article: Performance Improvement of KCS (Kalina Cycle System) 34 by Replacing Throttle Valve With Single-Screw Expander
Performance Improvement of KCS (Kalina Cycle System) 34 by Replacing Throttle Valve With Single-Screw Expander Open
In order to recover the energy loss due to the throttling in the path of ammonia-lean solution in the Kalina Cycle System (KCS) 34, two redesigned cycles, in which single-screw expanders that can perform two-phase expansion are used to rep…
View article: Numerical Study on the Coupling Process of Supercritical Heat Transfer and Combustion in the Boiler
Numerical Study on the Coupling Process of Supercritical Heat Transfer and Combustion in the Boiler Open
The conjugate heat transfer from in–furnace combustion to in-tube supercritical fluid has been numerically investigated in this study. The mathematic model of the conjugate heat transfer process has been constructed. The effects of the hea…
View article: Experimental research on latent heat characteristics of binary mixed molten salt
Experimental research on latent heat characteristics of binary mixed molten salt Open
At present, thermal storage is considered as one of the key technologies to alleviate the problem of instability and intermittence for renewable energy. Due to relatively high latent heat, latent heat storage by molten salt is considered t…
View article: Experimental Study on Heat Loss of a Single Screw Expander for an Organic Rankine Cycle System
Experimental Study on Heat Loss of a Single Screw Expander for an Organic Rankine Cycle System Open
For displacement expanders, the irreversible losses include leakage, friction, heat dissipation, and flow resistance. Currently, the research on the heat loss of expanders is scarce, especially with regards to experimental studies. In this…
View article: Numerical Study on the Effects of the Wick Structure of an AnnularHeat Pipe on the Isothermal Performance
Numerical Study on the Effects of the Wick Structure of an AnnularHeat Pipe on the Isothermal Performance Open
This paper presents a numerical work on the effect of wick construction on the isothermal performance of an annular heat pipe.Two type connection wick structures were designed, the axial direction connection wick structure and radial direc…
View article: Zeotropic Mixture Selection for an Organic Rankine Cycle Using a Single Screw Expander
Zeotropic Mixture Selection for an Organic Rankine Cycle Using a Single Screw Expander Open
The organic Rankine cycle (ORC) is a popular and promising technology that has been widely studied and adopted in renewable and sustainable energy utilization and low-grade waste heat recovery. The use of zeotropic mixtures in ORC has been…
View article: Modal Analysis of Variable Structure of Gate Rotor of CP-type Single-screw Structure
Modal Analysis of Variable Structure of Gate Rotor of CP-type Single-screw Structure Open
Single screw technology, due to its superiority of structure, has been widely used in many fields of gas compression, refrigeration, power and so on at present. However, specialized research on the dynamics of single screw structure has no…
View article: Working Fluid Selection for Organic Rankine Cycle Using Single-Screw Expander
Working Fluid Selection for Organic Rankine Cycle Using Single-Screw Expander Open
The organic Rankine cycle (ORC) is a popular technology used in waste heat recovery and medium-low-temperature heat utilization. Working fluid plays a very important role in ORC. The selection of working fluid can greatly affect the effici…
View article: Experimental Study on Temperature Distribution and Heat Losses of a Molten Salt Heat Storage Tank
Experimental Study on Temperature Distribution and Heat Losses of a Molten Salt Heat Storage Tank Open
Two-tank molten salt heat storage systems are considered to be the most mature thermal storage technology in solar thermal power plants. As the key part of the system, the thermal performance of molten salt tanks is of great importance. An…
View article: The effect of added magnesium nitrate on the thermophysical property of sodium nitrate
The effect of added magnesium nitrate on the thermophysical property of sodium nitrate Open
In the centralized solar power generation system, the molten salt is a key component for storing and transferring heat energy. By adding Mg(NO3)2 to NaNO3 at various mass ratios, nine binary nitrate specimens were prepared.The melting poin…
View article: Insights into the specific heat capacity enhancement of ternary carbonate nanofluids with SiO<sub>2</sub>nanoparticles: the effect of change in the composition ratio
Insights into the specific heat capacity enhancement of ternary carbonate nanofluids with SiO<sub>2</sub>nanoparticles: the effect of change in the composition ratio Open
The specific heat capacity of a ternary carbonate-SiO2nanofluid is enhanced by 113.7% at 540 °C.
View article: Numerical study on the internal characteristics of single screw expanders used in organic Rankine cycle systems
Numerical study on the internal characteristics of single screw expanders used in organic Rankine cycle systems Open
Single screw expanders have been widely studied in middle-low temperature heat recovery power system of organic Rankine cycle, which is significant for the energy-conservation and environment-protection. However, internal irreversible loss…
View article: Performance Study on a Single-Screw Expander for a Small-Scale Pressure Recovery System
Performance Study on a Single-Screw Expander for a Small-Scale Pressure Recovery System Open
A single-screw expander with 195 mm diameter is developed to recover pressure energy in letdown stations. An experiment system is established using compressed air as a working fluid instead of natural gas. Experiments are conducted via mea…
View article: Numerical Study of the Dynamic Response of Heat and Mass Transfer to Operation Mode Switching of a Unitized Regenerative Fuel Cell
Numerical Study of the Dynamic Response of Heat and Mass Transfer to Operation Mode Switching of a Unitized Regenerative Fuel Cell Open
Knowledge concerning the complicated changes of mass and heat transfer is desired to improve the performance and durability of unitized regenerative fuel cells (URFCs). In this study, a transient, non-isothermal, single-phase, and multi-ph…
View article: Slide Valves for Single-Screw Expanders Working Under Varied Operating Conditions
Slide Valves for Single-Screw Expanders Working Under Varied Operating Conditions Open
This paper fully describes the working principle of slide valves in single-screw expanders (SSEs). A geometric analysis of suction and volume ratio slide valves is presented to determine the relations between volume ratio, suction closure …
View article: Two-Dimensional Simulation of Mass Transfer in Unitized Regenerative Fuel Cells under Operation Mode Switching
Two-Dimensional Simulation of Mass Transfer in Unitized Regenerative Fuel Cells under Operation Mode Switching Open
A two-dimensional, single-phase, isothermal, multicomponent, transient model is built to investigate the transport phenomena in unitized regenerative fuel cells (URFCs) under the condition of switching from the fuel cell (FC) mode to the w…