Introduction Chilling freshly harvested beef carcasses is necessary for food safety and quality purposes. Before mechanical refrigeration, meat either had to be consumed immediately after slaughter or be preserved through salting, curing, and/or smoking. With the advent of mechanical refrigeration and networks of refrigerated carriers, the production, processing, and distribution of carcasses a...

Supermarkets suffer serious financial losses owing to problems with their refrigeration systems. Most refrigeration units have controllers which output "high-temperature" and similar alarms. We describe a system developed to predict alarm volumes from this data in advance, and compare evolved and backpropogation-trained neural networks, and evolved rulesets for this task.

refrigerants that are used in refrigeration systems, cause environmental difficulties such as depletion of ozone layer and greenhouse effect. thus, we must find substitutes for such refrigerants, in this paper, the effect of refrigerant on the thermodynamics performance of refrigeration cycles are studied. to do this, a refrigerator that has designed for r12, is simulated. results show that pur...

The aim of this work is to bring forward a new style heat exchanger about hollow fiber membrane module, and to analyze the performance which can expectantly be applied in the lithium bromide absorption refrigeration system. Polyvinylidene fluoride hollow fiber membrane module was adopted as the new style solution heat exchanger, hot feed solution from the generator flowed into the lumen side of...

The objective of this paper is to develop a mathematical model for thermodynamic analysis of an absorption refrigeration system equipped with an adiabatic absorber using a lithium-bromide/water (LiBr/water) pair as the working fluid. The working temperature of the generator, adiabatic absorber, condenser, evaporator, the cooling capacity of the system, and the ratio of the solution mass flow ra...

Gd flake samples were prepared by conventional ball milling technique starting from rapidly quenched ribbons and followed vacuum annealing in different conditions. Heat treatments conducted a at selected temperatures up to 600 K. The structural features, magnetic magnetocaloric properties comparatively analyzed. change entropy was calculated using an experimental set of isotherms measured wide ...

The effect of hydrostatic pressure on magnetic entropy change in a field, ΔSm, Fe7Se8 single crystals is determined. application shifts the spin–reorientation transition temperature, TSRT, to lower temperatures, similar action field applied perpendicularly c-axis. magnetization parallel c-axis monotonically decreases under increasing pressure. ΔSm and refrigeration capacity investigated strongl...

The balance between free radical production and antioxidant defenses in the body has important systemic and oral health implications. There is convincing evidence that breastmilk containing antioxidants is important in the prevention of diseases in infancy. This study compared the total antioxidant concentration of human breastmilk expressed at different stages of lactation, stored at various t...

The awareness to protect the environment from the harmful effects of CFCs has motivated the refrigeration scientists and engineers to study alternative refrigerants to replace the CFCs even in the existing units. This paper presents a thermodynamic study of hydrocarbon blends (Propane/lsobutane) and blends of HFC-134a-HC-600a as a possible "drop-in" (some electrical component to be changed to m...