OS4-10 Turbo-Heat Pump System applied aero-dynamics design of variable speed control

2005 ◽  
Vol 2005.10 (0) ◽  
pp. 181-184
Author(s):  
Wataru SEKI ◽  
Kenji UEDA ◽  
Yoshinori SHIRAKATA ◽  
Kenichiro NISHII ◽  
Yasushi HASEGAWA
Keyword(s):  
Heat Pump ◽  
Speed Control ◽  
Variable Speed ◽  
Pump System ◽  
Heat Pump System ◽  
Variable Speed Control

scholarly journals Assessing the performance limits of a variable-speed residential heat pump system

2021 ◽  
Vol 1180 (1) ◽  
pp. 012042
Author(s):  
John K. Brehm ◽  
David Augustine ◽  
Davide Ziviani ◽  
Eckhard A. Groll
Keyword(s):  
Heat Pump ◽  
Variable Speed ◽  
Performance Limits ◽  
Pump System ◽  
Heat Pump System

Experimental Study of the Compressor for the HFC125 Heat Pump

2011 ◽  
Vol 374-377 ◽  
pp. 524-529
Author(s):  
Feng Kun Wang ◽  
Xiao Wei Fan ◽  
Fang Wang
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Heat Pump ◽  
Experimental System ◽  
Variable Speed ◽  
Frequency Range ◽  
Pump System ◽  
Heat Pump System ◽  
New Model ◽  
Isentropic Efficiency

To study the performance of the compressor in the HFC125 heat pump system, the volumetric and isentropic efficiencies of a variable speed compressor with pendular pistons were measured with the developed experimental system of HFC125 heat pump in the frequency range of 15-115Hz. The result indicted that there were high volumetric and isentropic efficiencies for the compressor in every frequency. A new model for the calculation of volumetric efficiency and isentropic efficiency were proposed in this paper, and the 146 experimental data of the volumetric and isentropic efficiencies were fitted with the new model. For the volumetric and isentropic efficiencies, the average absolute deviations were 1.749% and 2.815%，respectively, and the maximum deviations were 5.397% and 6.793%, respectively. It could be known that the new model could describe accurately the performance of the variable speed compressor with pendular pistons.

3 kW Class Displacer Type Stirling Engine for Heat Pump System

1987 ◽  
Author(s):  
T. Nomaguchi ◽  
T. Suganami ◽  
M. Fujiwara ◽  
M. Sakai ◽  
T. Koda ◽  
...  
Keyword(s):  
Heat Pump ◽  
Stirling Engine ◽  
Pump System ◽  
Heat Pump System

DETERMINING THE PROFITABILITY OF GREENHOUSE ELECTROTECHNOLOGIES: A MODELING APPROACH

HortScience ◽  
1994 ◽  
Vol 29 (4) ◽  
pp. 249a-249
Author(s):  
Eric A. Lavoie ◽  
Damien de Halleux ◽  
André Gosselin ◽  
Jean-Claude Dufour
Keyword(s):  
Energy Consumption ◽  
Heat Pump ◽  
Water System ◽  
Heat Pumps ◽  
Hot Water ◽  
Pump System ◽  
Heat Pump System ◽  
Artificial Lighting ◽  
Hot Air ◽  
Marketable Fruit

The main objective of this research was to produce a simulated model that permitted the evaluation of operating costs of commercial greenhouse tomato growers with respect to heating methods (hot air, hot water, radiant and heat pumps) and the use of artificial lighting for 1991 and 1992. This research showed that the main factors that negatively influence profitability were energy consumption during cold periods and the price of tomatoes during the summer season. The conventional hot water system consumed less energy than the heat pump system and produced marketable fruit yields similar to those from the heat pump system. The hot water system was generally more profitable in regards to energy consumption and productivity. Moreover, investment costs were less; therefore, this system gives best overall financial savings. As for radiant and hot air systems, their overall financial status falls between that of the hot water system and the heat pump. The radiant system proved to be more energy efficient that the hot air system, but the latter produced a higher marketable fruit yield over the 2-year study.

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