Direct expansion solar assisted heat pumps – A clean steady state approach for overall performance analysis

Speech perception was investigated in a carefully selected group of adult subjects with familial dyslexia. Perception of three synthetic speech continua was studied: /a/-//, in which steady-state spectral cues distinguished the vowel stimuli; /ba/-/da/, in which rapidly changing spectral cues were varied; and /sta/-/sa/, in which a temporal cue, silence duration, was systematically varied. These three continua, which differed with respect to the nature of the acoustic cues discriminating between pairs, were used to assess subjects’ abilities to use steady state, dynamic, and temporal cues. Dyslexic and normal readers participated in one identification and two discrimination tasks for each continuum. Results suggest that dyslexic readers required greater silence duration than normal readers to shift their perception from /sa/ to /sta/. In addition, although the dyslexic subjects were able to label and discriminate the synthetic speech continua, they did not necessarily use the acoustic cues in the same manner as normal readers, and their overall performance was generally less accurate.

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Line-Start Permanent-Magnet Motor Single-Phase Steady-State Performance Analysis

IEEE Transactions on Industry Applications ◽

10.1109/tia.2004.824492 ◽

2004 ◽

Vol 40 (2) ◽

pp. 516-525 ◽

Cited By ~ 39

Author(s):

T.J.E. Miller ◽

M. Popescu ◽

C. Cossar ◽

M. McGilp ◽

G. Strappazzon ◽

...

Keyword(s):

Steady State ◽

Performance Analysis ◽

Permanent Magnet ◽

Single Phase ◽

Permanent Magnet Motor ◽

Steady State Performance

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Behavior and Performance of Refrigerant Mixture HFC125/HC290 in Heat Pumps

Volume 8B: Heat Transfer and Thermal Engineering ◽

10.1115/imece2013-63552 ◽

2013 ◽

Author(s):

Xiaowei Fan ◽

Fang Wang ◽

Huifan Zheng ◽

Xianping Zhang ◽

Di Xu

Keyword(s):

Energy Consumption ◽

Heat Pumps ◽

Operating Conditions ◽

Environment Friendly ◽

Factors Affecting ◽

Refrigerant Mixture ◽

Important Direction ◽

Overall Performance ◽

And Performance ◽

Binary Refrigerant

The refrigerant mixtures provide an important direction in selecting new environment-friendly alternative to match the desirable properties with the existing halogenated refrigerants or future use in the new devices, in which, HFCs refrigerants with zero ODP combined with HCs refrigerants with zero ODP and lower GWP are of important value in the fields of application. In the present work, research on HFC125/HC290 (25/75 by mass) binary refrigerant mixture used in heat pumps was carried out, and parameters, factors affecting the performance were investigated, and compared with that of HCFC22 under the same operating conditions. It has been found that the new mixture can improve the actual COP by 2 to 13% and hence it can reduce the energy consumption by 20 to 31.5%. The overall performance has proved that the new refrigerant mixture could be a promising substitute for HCFC22.

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Development of a steady-state thermodynamic model in microsoft excel for performance analysis of industrial gas turbines

IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society ◽

10.1109/iecon.2017.8216813 ◽

2017 ◽

Cited By ~ 2

Author(s):

Tyler A. Clifford ◽

Samuel Cruz-Manzo ◽

Yu Zhang ◽

Vili Panov ◽

Anthony Latimer

Keyword(s):

Steady State ◽

Performance Analysis ◽

Thermodynamic Model ◽

Gas Turbines ◽

Microsoft Excel ◽

Industrial Gas Turbines

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Studies of Heat Pumps Using Direct Expansion Type Solar Collectors

Solar Energy ◽

10.1115/isec2003-44212 ◽

2003 ◽

Author(s):

Sadasuke Ito ◽

Naokatsu Miura ◽

Yasushi Takano

Keyword(s):

Heat Pump ◽

Thermal Performance ◽

Pressure Loss ◽

Heat Pumps ◽

Hot Water ◽

Photovoltaic Module ◽

Direct Expansion ◽

Reduced Pressure ◽

In Series ◽

Hot Water Supply

A photovoltaic and thermal hybrid panel which was made of an aluminum roll -bond panel with a photovoltaic module on the surface was developed recently for use as an evaporator of a heat pump for residential hot water supply and room heating.1) Pressure loss of the refrigerant at the evaporator was large. Therefore, in the present study, shapes of the inlet and the outlet of the panel were modified to reduce pressure loss; also, thermal performance of the heat pump which adopted three evaporator panels connected in series was examined. Total area of the panels was about 1.9 m2 and the rated capacity of the compressor was 250 W. These modifications reduced pressure loss and improved thermal performance. The effect of the location of the feeler bulb on performance of the heat pump was also examined. It was inferred that the feeler bulb fixed on the tube at the outlet of the evaporator should be as close as possible to the evaporator outlet.

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