Ranendra Roy

Indian Institute of Engineering Science and Technology, Shibpur | IIEST · Department of Mechanical Engineering

The paper presents the thermo-economic performance comparison of a two-stage refrigeration system using five different refrigerants, namely R32, R290, R1270, R143a and R410A. Refrigerants are selected based on their nearly similar thermo-physical properties. Evaporator and condenser temperatures are varied from − 35 to − 21 °C and 40–55 °C, respect...

A single-stage vapor compression refrigeration system becomes inefficient and impractical when the temperature lift between the evaporator and the condenser becomes large. Under the high-temperature lift, different losses in the system increase, and more refrigerant vapor is formed at the end of the throttling process. The authors have attempted to...

A simple vapor-compression refrigeration system becomes ineffective and inefficient as it consumes a huge energy supply when operating between large temperature differences. Moreover, the recent Kigali amendment has raised a concern about phasing out some hydrofluorocarbon refrigerants due to their impact on the environment. In this paper, a numeri...

In this study, an attempt has been made to carry out a numerical investigation using water-based Al2O3 nanofluid, flowing through a circular tube under constant inlet temperature and constant heat flux conditions in the laminar flow regime. The water-based Al2O3 nanofluid is used in a circular plain tube first, and then, this process is repeated fo...

In this paper results of various thermodynamic parameters of a two stage vapor compression refrigeration system of 10kW cooling capacity is presented for evaporator temperature ranging between -30°C to -10°C and condenser temperature ranging between 40°C to 60°C. R143a and R125 are used as refrigerants in this system for comparative analysis as bot...

This paper investigates the effect of using expander instead of throttle valves on the thermodynamic and economic performances of a cascade refrigeration system with refrigerant pairs R170-R161 and R41-R161. The influences of different design parameters on the thermo-economic performance parameters of the cascade refrigeration system with expander...

An attempt has been made to investigate numerically a 2-stage refrigeration system with flash intercooler of 50 kW cooling capacity using refrigerant R410A and its possible alternative R32. Development of the simulation model for the analysis of the system has been carried out in engineering equation solver considering the energetic, exergetic, eco...

This paper deals with the thermodynamic analyses of a two-stage mechanical vapour compression refrigeration system using the refrigerants R134a and R600a. Refrigerant R600a is considered as an alternative refrigerant to R134a due to its lower GWP value than R134a. A mathematical model has been developed for two-stage VCR system and simulated using...

A numerical investigation of energetic, exergetic, economic and environmental performances of a 50-kW cooling capacity cascade refrigeration system using four different refrigerant pairs, namely R41–R404A, R170–R404A, R41–R161 and R170–R161, has been carried out. Effects of evaporator temperature, condenser temperature, LTC condenser temperature an...

This paper presents a review on energy and exergy analysis of two-stage vapour compression refrigeration (VCR) system. The use of alternative refrigerants instead of conventional refrigerants has also been addressed. The governing equations for the energetic and exergetic analysis of two-stage VCR system have been identified and presented. Several...

This paper deals with the thermo-economic analysis and multi-objective optimization of simple vapour compression refrigeration system using three low GWP refrigerants namely, R152a, R600a and R1234ze. A model has been developed in EES to analyze the system thermo-economically. Effect of evaporator and condenser temperature on COP, exergetic efficie...

A numerical study of cascade refrigeration system using two different refrigerant pairs, namely, R41–R404A and R170–R161 working under the same operating conditions has been presented in this paper. A computer code has been developed in Engineering Equation Solver software using the basic energy and exergy equations of cascade refrigeration system....

In this paper, a comparative study of vapour cascade refrigeration system performance with R41 – R161 and R41 – R404A refrigerant couples have been presented to find out best suited refrigerant between R161 and R404A in the high temperature circuit. A mathematical model has been developed using the basic equations of refrigeration system for the ca...

A numerical simulation of vapour compression refrigeration system has been carried out using different refrigerants such as R152a, R404A and R600a. A computational simulation model is developed and simulation is carried out using CoolPack software for analyzing the vapour compression refrigeration system performances. Simulation is done within the...

The performance analysis of a modified vapour compression refrigeration system has been carried out in this paper based on energy and exergy analysis and compared with the combined effect of two separate systems. The system is modified combining two conventional systems through a heat exchanger. Heat exchanger in the modified system acts as a conde...

Refrigeration and airconditioning play a vital role in domestic and industrial applications. They have great impact on our day-today life. They have also contributed to the world's major environmental issues like ozone layer depletion and global warming. The development of the refrigeration systems and the refrigerants used in them, from the days w...

In this paper numerical investigation of a vapour compression refrigeration system using mechanical subcooler loop has been presented. A mathematical model has been developed for the systems with and without subcooler based on energy and exergy equations. Refrigerant used in both the systems is R134a. The performance of the systems with and without...

The environmental problems of ozone depletion and global warming are of major concern in the world. Refrigeration and airconditioning have been identified as major causes for ozone layer depletion and global warming. Thus, there is a great need to search for alternative refrigerants which can be used to replace the conventional CFC and HFC refriger...

Thermodynamic analysis of an ideal vapour compression refrigeration system is done in this paper using refrigerants as CFC12, R134a and R290. This analysis is done by developing a mathematical model. A FORTRAN code is developed to solve the mathematical problems. Various parameters computed in this papers are compressor power, coefficient of perfor...

Depletion of ozone layer in the stratosphere and global warming caused due to the use of different CFC and HCFC refrigerants have forced for the search of alternative refrigerants. R-134a is found to be a suitable alternative to CFC R-12 having similar thermodynamic properties. For the basic as well as complex cycle calculations, the accurate deter...

This paper presents a brief review on the use of methanol and di-methyl ether (DME) in spark ignition engine, their performance and emission characteristics based on the reports of different researchers available in the literature. Methanol can be produced from available fossil raw materials and also from biomass. A very few literature is available...

Nuts and bolts are widely used fastening elements in industrial and household applications. They offer a good amount of tightening load to remain in the fastened element and also cause easy assembly and disassembly. However, they are also subject to loosening under transverse vibration. Therefore, fasteners need be properly selected according to th...

Threaded fastener is widely used in industrial and household applications. It retains good amount of tightening load and also offers easy assembling and disassembling. However, it can be loosened under vibration thereby causing fatal mishaps sometimes. In the present experimental investigation, a comparative study of the anti-loosening tendency of...