Aiming at solving the problems of high compressor discharge temperature, pressure, insufficient cooling capacity, and reduced system efficiency in air-conditioning pure electric passenger cars summer temperature environment, this paper develops a low pressure economizer using principle quasi-two-stage compression cycle. The heat pump air conditioning air-supplemented car is set up to study its ...

abstract: minimizing the work consumed in refrigeration system is the most effective measure to reduce the cost of products in sub-ambient chemical processes. the introduction of mixed working fluids into refrigeration system in place of pure working fluids is a recent advancement applied in the field. due to the lack of systematic design method for mixed refrigerant cycle (mrc), conventional a...

Solid-state refrigeration represents a promising alternative to vapor compression systems which are inefficient, unreliable, and have high global warming potential. However, several solid-state cooling technologies—including those relying on temperature change induced by an applied electric field (electrocaloric effect), magnetic (magnetocaloric uniaxial stress (elastocaloric effect)—have been ...

Low-temperature refrigeration is of crucial importance in fundamental research of condensed matter physics, because the investigations of fascinating quantum phenomena, such as superconductivity, superfluidity, and quantum criticality, often require refrigeration down to very low temperatures. Currently, cryogenic refrigerators with (3)He gas are widely used for cooling below 1 K. However, usag...

In this study, the hydrothermal method was used to synthesize MIL-101(Cr), and activated carbon (AC) with different content incorporated in thereby obtaining AC-MIL-101(Cr) composite material a huge specific surface area. The physical properties of MIL-101(Cr) were characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), nitrogen ad...

In recent years the energy usage of supermarkets, in particular that of their refrigeration systems, has been investigated using a variety of approaches, such as floating pressure set points and integrating the heating and refrigeration systems. Something which has not yet attracted much attention is the energy consumption of the dry condenser fans in refrigeration systems. This is surprising a...

For most of the last fifty years, refrigeration and heat pump systems have been based on cycles using a fluorocarbon as the working fluid. Hovvever, with the discovery that fluorocarbons may have a profoundly detrimental effect on the earth ·s atmosphere. it has become necessary to find a suitable replacement for a fluorocarbon based refrigeration cycle. Such a replacement must perform comparab...