The refrigeration cycle with the thro~tling device has moe work power consumption and less refrigeration capacity than tha~ with the expander. It is S':Jggested that substituting the expander for the throttling device in the refrigeration cycle should be the efficient way for saving the energy of the refrigeration system. Up to now, the design and ~anufacturing of the two-phase expander seems t...

Refrigeration is one of the leading uses of electric power in the United States. The term "refrigeration" refers to air-conditioning for homes, businesses, and industry and the operation of refrigerators, freezers, and heat pumps. The technology most often used in refrigeration, the vapor compression cycle, is 100 years old, inefficient, and environmentally unsound. Since the 1980s, the refrige...

Ammonia can be applied to any type and size of refrigeration system from domestic refrigeration to commercial refrigeration and air-conditioning to industrial refrigeration. However, it is desirable to minimize the charge to prevent toxic effects and, sometimes to use secondary refrigerants, such as volatile carbon dioxide, to keep ammonia away from the general public. This article describes a ...

1. Matter and Techniques at Low Temperatures 1.1.Introduction 1.2.Historical Remarks on the Development of Low Temperature Physics and Techniques 1.3.Combining Dilution Refrigeration with Adiabatic Nuclear Demagnetization: The Way to Microkelvin Physics 1.4.Macroscopic Quantum Phenomena: Superconductivity and Superfluidity 1.4.1.Superconductivity 1.4.2.Superfluidity 2. Magnetic Fields and Magne...

â liquefied natural gas (lng) is the most economical way of transporting natural gas (ng) over long distances. liquefaction of ng by using vapor compression refrigeration system requires high operating and capital cost. due to lack of systematic design methods for multistage refrigeration cycles, the conventional approaches of determining optimal cycle configuration are mostly based on trial-an...

In this paper we present a novel approach for the optimization of fresh-food supply chain by managing a trade-off between logistics and some index measuring the quality of the food itself. We propose an hybrid model of the chain, with a part constituted by a event–driven dynamics (the supply chain itself) and a part with time–driven dynamics (the dynamics of some parameters characterizing the j...

Hybrid vapor compression systems based on adsorption are recognized as a viable alternative to traditional energy-intensive systems. Solar-powered hybrid adsorption-compression refrigeration feature solar-powered silica gel/water-based cooling system paired with that utilizes R134a refrigerant. Herein, the feasibility of solar-operated has been evaluated theoretically using typical climatic dat...

This review discusses the progress and ongoing efforts in optical refrigeration. Optical refrigeration is a process in which phonons are removed from a solid by anti-Stokes fluorescence. The review first summarizes the history of optical refrigeration, noting the success in cooling rare-earth-doped solids to cryogenic temperatures. It then examines in detail a four-level model of rare-earth-bas...

*1 Air-Conditioner Designing & Engineering Department, Air-Conditioning & Refrigeration Division *2 Manager, Air-Conditioner Designing & Engineering Department, Air-Conditioning & Refrigeration Division *3 Chief Staff Manager, Sales Department, Air-Conditioning & Refrigeration Division *4 Professor, Department of Electrical, Electronic and Computer Engineering, Faculty of Engineering, Gifu Univ...