Greenhouse Surface Heating with Power Plant Cooling Water: Heat Transfer Characteristics

1979 ◽  
Vol 22 (6) ◽  
pp. 1370-1374 ◽  
Author(s):  
Paul N. Walker
Keyword(s):  
Heat Transfer ◽  
Power Plant ◽  
Cooling Water ◽  
Surface Heating ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Power Plant Cooling

Experimental Investigation on the Heat Transferring of Nanofluid in Self-Exciting Mode Oscillating-Flow Heat

2016 ◽  
Author(s):  
Fu-Min Shang ◽  
Yi-Fang Dong ◽  
Jian-Hong Liu ◽  
Deng-Ying Liu
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Laser Heating ◽  
Cooling Water ◽  
Oscillating Flow ◽  
Distilled Water ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Condensation Section ◽  
Flow Heat

In this article, the heat transferring property of the copper-water nanofluids in self-exciting mode oscillating flow heat pipe under different laser heating power is experimented, as well as is compared with that of the distilled water medium in self-exciting mode oscillating flow heat pipe under same heating condition. The objective of this article is to provide the heat transfer characteristics of Cu-H2O nanofluids in self-exciting mode oscillating-flow heat pipe under different laser heating input, and to compare with the heat transfer characteristics of the same heat pipe with distilled water as working fluids. The SEMOS HP used in this experiment is made of brass tube with 2mm interior diameter, which is consisted of 8 straight tubes with 4 turns’ evaporation section and 12 turns’ condensation section. The heat resource for the evaporation zone is eight channel quantum pitfall diode array semi-conductor laser heater with 940nm radiation wave length, while the radiation power of each channel is changeable within 0–50W and the facular size is 1×30mm2. The condensation section is set in a cooling water tank in which water is from another higher tank. The actual transferring rate could be calculated by the flow rate of the cooling water and the change of the temperature. The change of the temperature of the heat pipe wall is measured by those thermo-couple fixed in different section in the heat pipe and data is collected by a data acquisition. In the heat pipe the fluid filling rate is 43%, the pressure is 2.5×10−3Pa, and the heat pipe inclination angle is 55° while the size of the brass particle in the nanofluids is less than 60nm and volume proportion is 0.5%. In this paper, the particularity of heat transfer rate of the SEMOS heat pipe with Cu-H2O fluid has been experimentally confirmed by changing the proportion of working fluid and Cu nonsocial particles in the heat pipe. By comparing the experimental result of these two different medium in the SEMOS HP, it is shown that the heat transferring rate with brass-water nanofluids as medium is much better than that with distilled water as medium under same volume proportion.

Experimental Study on Gas Cooler Heat Transfer Characteristics Applied in CO2 Supercritical Cycle Heat Pump Water Heater

2010 ◽  
Author(s):  
Yefeng Liu ◽  
Hua Zhang ◽  
Caoping Cai ◽  
Weidong Wu ◽  
Yingxia Qi
Keyword(s):  
Heat Transfer ◽  
Heat Pump ◽  
Water Flow Rate ◽  
Water Flux ◽  
Cooling Water ◽  
Outlet Temperature ◽  
Heat Transfer Characteristics ◽  
Water Heater ◽  
Transfer Characteristics ◽  
Heat Pump Water Heater

One CO2 heat pump water heater test apparatus was built in the paper. The heat transfer characteristics of CO2 in gas cooler with water in double-pipe heat exchanger was experimentally investigated. The effects of variation of cooling water flux on heat transfer characteristics, outlet temperature of water, COP and CO2 temperature were analyzed. The influences of cooling water flux to heat exchange about CO2 side, water side, and the CO2 and water temperature matching was analyzed. Experimental results showed that the supercritical CO2 heat pump water heater can acquire higher temperature of outlet water up to 80°C than those conventional Freon heat pump water heater, and the COP of the system increased with the increase of water flow rate through gas cooler. All the work was valuable for the application of CO2 heat pump water heater.

Mechanism and Condensation Heat Transfer Characteristics Research on the Depth of the Flue Gas Heat Recovery from Burning Natural Gas

2014 ◽  
Vol 687-691 ◽  
pp. 637-640
Author(s):  
Jian Wei Han ◽  
Wei Lv ◽  
Jian Min Gao ◽  
Qian Du ◽  
Chao Cheng ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Natural Gas ◽  
Flue Gas ◽  
Heat Recovery ◽  
Cooling Water ◽  
Dew Point ◽  
Condensation Heat Transfer ◽  
Dropwise Condensation ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics

This article probe into the depth of the flue gas heat recovery from the burning of natural gas. It explore the mechanism of the way to control the temperature of the flue gas from the burning of natural gas below the dew point temperature. It expounds the absorption way of sensible heat and latent heat from the vaporization in flue gas. After the study on the condensation heat transfer characteristics of the flue gas from the burning of natural gas, we can find that the dropwise condensation is more conducive to the heat exchange between flue gas and cooling water. And to find the method of dropwise condensation.

scholarly journals Effect of Pulsating Flame Jet on Flow and Heat Transfer Characteristics

2020 ◽  
Vol 77 (1) ◽  
pp. 11-23
Author(s):  
Wongsathon Boonyopas ◽  
Nuttamas Uppatam ◽  
Chattawat Aroonrujiphan ◽  
Natthaporn Kaewchoothong ◽  
Somchai Sae-ung ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Flame Structure ◽  
Cooling Water ◽  
Digital Camera ◽  
Heat Transfer Characteristics ◽  
Distance Ratio ◽  
Average Heat ◽  
Transfer Characteristics ◽  
Impingement Surface

This research aims to study the effect of pulsating frequency on flame structure and heat transfer characteristics of premixed flame from a pipe nozzle. The LPG and air were used as gas fuel and oxidizer. The equivalence ratios ( ) were evaluated at 0.8, 1.0, and 1.2 under a constant Reynolds number Re = 500. The effect of nozzle-to-impingement surface distance ratio was investigated at H = 2D to 10D, here D is the nozzle diameter at 12 mm. The frequency of pulsating (f) was varied from f = 0 to 10 Hz using a solenoid valve. The flame structures of free flame jet and the impinging flame jet were recorded with a digital camera. The average heat flux on impingement surface was measured with water cooling plate and evaluated from the heat balance of the cooling water. The results show that the pulsating of flame jet become having gap on flame and the mushroom appear at the end of flame. The size of mushroom structure becomes larger when increasing the frequency. While the non-pulsating jet did not appear in this structure. Pulsating flame jet can increase the overall average heat flux on the impingement surface up to about 12% for case of = 1.2 and H = 2D and f = 10 Hz. when compared to case of f = 0 Hz.

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