scholarly journals Prediction and Performance of Compact Heat Exchanger with Small Diameter Tubes for Latent Heat Recovery

2009 ◽  
Vol 4 (1) ◽  
pp. 36-46 ◽  
Author(s):  
Masahiro OSAKABE ◽  
Sachiyo HORIKI ◽  
Yuichi HANAKI
Keyword(s):  
Heat Exchanger ◽  
Latent Heat ◽  
Heat Recovery ◽  
Small Diameter ◽  
Compact Heat Exchanger ◽  
And Performance

Prediction and Performance of Compact Latent Heat Recovery Heat Exchanger With Small Diameter Tubes

2007 ◽  
Author(s):  
Masahiro Osakabe
Keyword(s):  
Heat Exchanger ◽  
Power System ◽  
Latent Heat ◽  
Heat Recovery ◽  
Small Diameter ◽  
Cooling Water ◽  
Prediction Method ◽  
Outer Diameter ◽  
Exhaust Gas ◽  
And Performance

The most part of energy losses in power system such as fuel cells is due to the heat released by the exhaust gas to atmosphere. The exhaust gas consists of non-condensable gas and steam with sensible and latent heat. As a lot of latent heat is included in the exhaust gas, its recovery is very important to improve the power system efficiency. Based on the previous basic studies, a thermal hydraulic prediction method for latent heat recovery exchangers was proposed. For the condensation of steam on heat transfer tubes, the modified Sherwood number taking account of the mass absorption effect on the wall was used. Two kinds of compact heat exchanger with staggered banks of bare tubes of 10.5 or 4mm in outer diameter was designed with the prediction method. The more compactness was obtained with the smaller tubes at a designed heat recovery. The thermal hydraulic behavior in the compact heat exchangers was experimentally studied with air-steam mixture gas. In the parametric experiments varying the steam mass concentration, the temperature distributions of cooling water and mixture gas were measured. The experimental results agreed well with the prediction proposed in this study and the more compactness with the smaller tubes was proved.

Effect of Header on Latent Heat Recovery Heat Exchanger

2011 ◽  
Author(s):  
Masahiro Osakabe
Keyword(s):  
Heat Exchanger ◽  
Latent Heat ◽  
Recovery Rate ◽  
Pressure Loss ◽  
Heat Recovery ◽  
Reduction Rate ◽  
Small Diameter ◽  
Prediction Method ◽  
Exhaust Gas ◽  
Water Side

The most part of energy losses in heat & power system is due to the heat released by the exhaust gas to atmosphere. The exhaust gas consists of non-condensable gas and steam with sensible and latent heat. As a lot of latent heat is included in the exhaust gas, its recovery is very important to improve the system efficiency. Based on the previous basic studies, a thermal hydraulic prediction method for latent heat recovery exchangers was proposed. Two kinds of compact heat exchanger with staggered banks of large and small diameter tubes were designed and fabricated based on the prediction method. In the calculations varying the various parameters, approximately the same heat recovery rate was obtained with both the heat exchangers. The more compactness was obtained with the small tubes at a desired heat recovery rate. The pressure loss in gas side was slightly smaller and that in water side was significantly larger incase of the small tube. By adapting the single header instead of conventional multi header, the pressure loss in the water side could be significantly reduced but the reduction rate of heat recovery was only between 40 to 10%.

EFFECT OF CONDENSATION ON THE EFFICIENCY OF HEAT RECOVERY VENTILATORS FOR BROILER HOUSES

2013 ◽  
Vol 21 (02) ◽  
pp. 1350009 ◽  
Author(s):  
HWATAIK HAN ◽  
SANG-HOON NAM ◽  
GEON-SOO HAN
Keyword(s):  
Heat Exchanger ◽  
Relative Humidity ◽  
Latent Heat ◽  
Heat Recovery ◽  
Harsh Environments ◽  
Sensible Heat ◽  
Outdoor Temperature ◽  
Toxic Gases ◽  
Temperature Efficiency ◽  
Plate Type

This study experimentally investigates the effect of internal condensation on the performance of a heat recovery ventilator. Experiments were performed using a plate-type sensible heat exchanger element that was designed for very humid and dusty environments such as chicken broiler houses. The results of these experiments show that the temperature efficiency considering condensation is always greater than that without considering latent heat. As outdoor temperature decreases or indoor relative humidity increases, temperature efficiency increases owing to an increase in the rate of condensation. The present polypropylene-based sensible heat exchanger element could be a solution for harsh environments because it can discharge condensate water by gravity and is resistant to moisture and other toxic gases.

An Innovative Compact Heat Exchanger Solution for Aluminium Off-Gas Cooling and Heat Recovery

2013 ◽  
pp. 793-797 ◽  
Author(s):  
El Hani Bouhabila ◽  
Erling Naess ◽  
Victoria Kielland Einejord ◽  
Kolbeinn Kristjansson
Keyword(s):  
Heat Exchanger ◽  
Heat Recovery ◽  
Compact Heat Exchanger ◽  
Gas Cooling

1213 Heat Transfer and Pressure Drop Characteristics in Latent Heat Recovery Type Heat Exchanger : Effects of Fin Pitch of Offset Type Fin

2005 ◽  
Vol 2005.42 (0) ◽  
pp. 405-406
Author(s):  
Kiyoshi KAWAGUCHI ◽  
Kenichi OKUI ◽  
Takahiro SHIMOURA ◽  
Takaki OHKOUCHI ◽  
Hiroyuki OSAKABE ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Latent Heat ◽  
Heat Recovery

F124 A Study on Compactification of Latent Heat Recovery Heat Exchanger for Gas Water Heater

2007 ◽  
Vol 2007 (0) ◽  
pp. 205-206 ◽  
Author(s):  
Yukio FUJIWARA ◽  
Junichi FUJIYAMA ◽  
Hitoshi ASANO ◽  
Kazuhiro KIMURA
Keyword(s):  
Heat Exchanger ◽  
Latent Heat ◽  
Heat Recovery ◽  
Water Heater

scholarly journals Performance Enhancement on Gas Fired Water Heater Using Titanium Heat Exchanger for Latent Heat Recovery

2005 ◽  
Vol 84 (1) ◽  
pp. 62-67
Author(s):  
Kyudae HWANG ◽  
Sunggun HYUN ◽  
Kiyoshi SAITO ◽  
Sunao KAWAI ◽  
Katsuyuki INAGAKI ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Latent Heat ◽  
Heat Recovery ◽  
Performance Enhancement ◽  
Water Heater
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