It is good to be able to pass on the best wishes of the International Institute of Refrigeration (IIR) and to remind you that the IIR will be holding its Gustav Lorentzen Memorial Conference in Glasgow next year. I hope that the IIR conference will be as well supported and as valuable as this CIBSE/ASHRAE conference. You are warmly invited to attend the Gustav Lorentzen conference in Glasgow, w...

The temperature separation effects of vortex tubes have been widely studied in open systems, using mainly air or N2as the working fluid. When a tube is employed closed thermal system, more fluid choices, such as refrigerants, could be considered. Different to air, refrigerants quite varied thermal-physical properties, and research properties? influence on effect rather limited. Based CFD simula...

Experimental and simulation investigation of the performance characteristics different refrigerants blends is carried out to replace existing refrigerant R134a for a vapour compression refrigeration system. The VCRS systems was improved by several researchers introducing concept mixing family with low GWP in working circuit. This research paper presents results that can it also an attempt cover...

Refrigerants are commonly used as heat transfer fluid in refrigeration, pumps, and air conditioning systems. Nanorefrigerants a special kind of nanofluid synthesized by dispersing nanoparticles into refrigerants or lubricant oil to improve its thermophysical characteristics. The optimization the properties nanorefrigerant strongly depends on successful synthesis procedures for producing stable ...

The methods for improving second law efficiency have been considered in this paper by using liquid vapour heat exchanger is investigated in this paper. Detailed energy and exergy analysis of multi-evaporators at different temperatures with single compressor and single expansion valve using liquid vapour heat exchanger vapour compression refrigeration systems have been done in terms of performan...

Refrigerants with low global warming potential (GWP) are much needed in automotive air conditioning systems. This paper compares two refrigerants, R134a (GWP=1300) and R513A (GWP = 573) experimentally. The results show that the latter has lower cooling capacity, COP discharge temperature than former, revealing is a promising replacement of its high GWP partner.

A computer model representing a two-evaporator, two-intercooler refrigerator-freezer opera ting at steady-state with nonazeotropic refrigerant mixtures (CYCLEZ) has been developed at Oak Ridge National Laboratory (ORNL). This model is being used to assess the effects of system desig n and operating parameters on the cycle performance of a refrigerator-freezer designed around the L orenzMeutzner...

This paper describes the development of a computer simulation model of an integrated supermarket refrigeration and heating system using natural refrigerants (namely ammonia and hydrocarbons). Initial resultS of the model's performance are presented, showing the influence of some of the operating parameters on system thermal efficiency. This will be validated using data collected from monitoring...

The thermal conductivity of refrigerants is needed to optimize and design the main components HVAC&R systems. Consequently, it crucial have reliable models that are able accurately calculate temperature pressure dependence refrigerants. For first time, this study presents a neural network specifically developed liquid various low-GWP-based In detail, feed-forward algorithm with 5 input para...