Groundwater heat pump selection for high temperature heating retrofit

2012 ◽  
Vol 49 ◽  
pp. 294-299 ◽  
Author(s):  
Dragi Lj. Antonijević ◽  
Dimitrije J. Manić ◽  
Mirko S. Komatina ◽  
Nedžad R. Rudonja
Keyword(s):  
High Temperature ◽  
Heat Pump ◽  
Groundwater Heat Pump ◽  
Selection For ◽  
Temperature Heating ◽  
High Temperature Heating

scholarly journals Thermodynamic Analysis of a Cascade Heat Pump Incorporated in High-Temperature Heating System

2020 ◽  
Vol 66 (11) ◽  
pp. 677-683
Author(s):  
Nedžad Rudonja ◽  
Milan Gojak ◽  
Ivan Zlatanović ◽  
Ružica Todorović
Keyword(s):  
High Temperature ◽  
Heat Pump ◽  
Thermodynamic Analysis ◽  
Heating System ◽  
Ambient Air ◽  
Pump System ◽  
Working Fluids ◽  
Heat Pump System ◽  
Temperature Heating ◽  
High Temperature Heating

In this article is presented a thermodynamic analysis of a cascade heat pump system designed for using in high-temperature heating systems. The own thermodynamic model was built by using properties of working fluids from the CoolProp base. The cascade heat pump was designed to use ambient air as heat source with temperature t_amb= –20 °C and for heating water in the high-temperature heating system up to 70 °C. The projected heating capacity of the cascade heat pump was 100 kW. The coefficient of performance (COP) of the cascade heat pump system due to use of different working mediums combinations in cycles of the cascade heat pump was investigated. For the best combination of working fluids (mediums) sub-cooling, super-heating, pressure loss in compressor’s suction line, as well as exergy efficiency of the heat pump were analysed as a function of the mean temperature of the cascade heat exchanger.

SIMULATION ON THE PERFORMANCE OF CARBON DIOXIDE AND HYDROCARBON HEAT PUMPS FOR MODERATE TO HIGH TEMPERATURE HEATING

2014 ◽  
Vol 22 (01) ◽  
pp. 1450001 ◽  
Author(s):  
YOUNG-JIN BAIK ◽  
MINSUNG KIM ◽  
HO-SANG RA
Keyword(s):  
Carbon Dioxide ◽  
High Temperature ◽  
Heat Source ◽  
Heat Pump ◽  
Heat Pumps ◽  
Design Parameters ◽  
Inlet Temperature ◽  
Heat Conductance ◽  
Temperature Heating ◽  
High Temperature Heating

In order to compare the performance of the carbon dioxide, propane and isobutane heat pumps for moderate to high temperature heating, the three heat pump cycles were optimized using a simulation method. To fairly compare the performance of the cycles by using different working fluids, each cycle was optimized from the viewpoint of heating COP by two design parameters. The first is the gas cooler (or condenser) exit temperature and the other is the ratio of the overall heat conductance of the gas cooler to the combined overall heat conductance of the gas cooler and the evaporator. The inlet and outlet temperatures of secondary fluid of the gas cooler (or condenser) were fixed at 40/90°C and 40/150°C. The heat source inlet temperature was fixed at 10°C. The flow rates of both the heat source and the heat sink were also fixed. The results shows that the hydrocarbon heat pumps have 11–17% higher heating COP than carbon dioxide heat pump under the simulation conditions considered in the present study. However, for a high temperature heating, even though the isobutane heat pump shows the best performance, the carbon dioxide heat pump looks promising due to hydrocarbon heat pumps' high compression ratio.

Modeling the High-Temperature Heating of Scrap Metals

Vestnik MEI ◽  
2019 ◽  
Vol 6 ◽  
pp. 58-63
Author(s):  
Konstantin V. Strogonov ◽  
◽  
Andrey A. Chaymelov ◽  
Keyword(s):  
High Temperature ◽  
Scrap Metals ◽  
Temperature Heating ◽  
High Temperature Heating

Can microorganisms survive high-temperature heating during the interplanetary transfer by meteorites?

BIOPHYSICS ◽  
2007 ◽  
Vol 52 (6) ◽  
pp. 640-644 ◽  
Author(s):  
A. K. Pavlov ◽  
V. N. Shelegedin ◽  
V. T. Kogan ◽  
A. A. Pavlov ◽  
M. A. Vdovina ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Heating ◽  
High Temperature Heating

Phase composition of steel 0Kh21N6B after high-temperature heating and tempering

1969 ◽  
Vol 11 (4) ◽  
pp. 331-332
Author(s):  
�. G. Fel'dgandler ◽  
E. N. Kareva ◽  
E. F. Yakovleva
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Temperature Heating ◽  
High Temperature Heating

Relieving of Residual Stresses in Metal Workpieces at High and Low Temperatures

2021 ◽  
Vol 887 ◽  
pp. 651-656
Author(s):  
Marina V. Polonik
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Residual Stresses ◽  
Low Temperatures ◽  
Creep Properties ◽  
Processing Modes ◽  
Properties Of Materials ◽  
High And Low Temperatures ◽  
Temperature Heating ◽  
High Temperature Heating

On the basis of previously accumulated irreversible deformations, and, consequently, residual stresses, the process of removing residual stresses in metal workpieces under the action of low and high temperatures is simulated. Boundary value problems are solved and here are described regularities that are responsible for removing residual stresses for processing modes: high-temperature heating - cooling, high-temperature heating - holding - cooling, low-temperature heating - holding - cooling. The holding stage is modeled, taking into account the creep properties of materials under Norton creep conditions. According to the dependences of the obtained exact solutions, it is shown that it is the holding process that leads to the relaxation of residual stresses.

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