Kazuhiro Endoh

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With the rapid growth of the Internet, users are increasingly seeking real-time multimedia application services. To meet this requirement, many streaming methods are developed. However, most of streaming systems are used for ornamental use such as video on demand (VOD). Users for such application do not require interaction, so reducing jitter is the most(More)
A new refrigerant, HFO1234yf, with a very low global warming potential has been proposed. We have done an improvement test, in which we modified a room air conditioner that had been using R410A to meet the properties of HFO1234yf and evaluated the cycle performance. The main modifications were doubling the number of paths of heat exchangers, triplicating(More)
In response to the trend for phasing out CFCs, we have developed a high efficiency HFC-134a rotary compressor, whose total adiabatic efficiency is 9% higher Lhan that of the present CFC-12 one. This paper describes the causes for the usual poor performance of rotary compressors using HFC-134a and explains how we improved the performance. INTRODUCTION CFCs(More)
This study was performed to evaluate the effects of the air sparge rate, working liquid volume, liquid feed rate onto the disk, and disk diameter on the foam-breaking performance of foam-breaking apparatus with a rotating disk (FARD) installed in the bubble column. Experimental results showed that the smaller the air sparge rate and working liquid volume(More)
A heat exchanger that arranges flat tubes horizontally has a vertical header that distributes the refrigerant to each tube. When the heat exchanger works as an evaporator, differences in flow conditions at each branch, such as the ratio and distribution of vapor and liquid, due to the differences in densities and momentums of vapor and liquid in the(More)
To evaluate performance and reliability of an air conditioner, the states of its refrigeration cycle need to be understood. Since the isentropic exponent of the next-generation refrigerant R32 is larger than that of conventional refrigerant R410A, the compressor discharge temperature of R32 is higher than that of R410A. When a wet refrigerant is entered(More)
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