Comparison Between Heat Pipes Based Condenser and Conventional Condenser of Power Plant
Issue:
Volume 7, Issue 3, September 2022
Pages:
32-42
Received:
29 March 2022
Accepted:
4 May 2022
Published:
24 October 2022
DOI:
10.11648/j.wjap.20220703.11
Downloads:
Views:
Abstract: Condenser is a vital part in the steam circuit of power plant. But since inception there wre no modifications in the design of this vital component. The only variations are, the type of nonferrous tubes and tube matrix according load on the condenser. In this paper design modification of condenser suggested viz. type heat transfer utilized in the condenser. Two phase heat transfer suggested instead single heat phase heat transfer as in conventional condenser. This type of two phase heat transfer achieved by using heat pipes. The heat pipe designed for this special application of steam condensation. A laboratory model of condenser with 16 heat pipes fabricated and experiments were conducted on this heat pipe based condenser. The comparison of the performances of conventional condenser made of simple copper tubes and heat pipe based condenser were presented in this paper. Effectiveness calculations, heat transfer surface area comparison, comparison of exergy analysis for the both type of condenser presented in this paper. The comparative study reveals that the heat pipe based condenser had much improved performance parameters over the condenser made up with copper tubes.
Abstract: Condenser is a vital part in the steam circuit of power plant. But since inception there wre no modifications in the design of this vital component. The only variations are, the type of nonferrous tubes and tube matrix according load on the condenser. In this paper design modification of condenser suggested viz. type heat transfer utilized in the c...
Show More
Study on the Compaction Temperature of Warm Mix Asphalt Mixture Based on Different Test Equipment
Xiaosen Wang,
Gang Li,
Jie Li
Issue:
Volume 7, Issue 3, September 2022
Pages:
43-47
Received:
10 October 2022
Accepted:
7 November 2022
Published:
22 November 2022
DOI:
10.11648/j.wjap.20220703.12
Downloads:
Views:
Abstract: Warm mix asphalt has special viscosity characteristics, and the compaction mechanism is different from that of hot mix asphalt. It is necessary to investigate the compaction characteristics of warm mix asphalt by laboratory test. The compaction characteristics of surface active warm mix SMA mixture were determined by viscosive-temperature curve, rotational compaction and Marshall compaction. The experimental results show that the surface active warm mix has little effect on the viscosity of asphalt, it changes the interface characteristics between asphalt and aggregate, and makes the mixture more easily compacted. The viscosity-temperature curve is not suitable for determining the mixing and rolling temperature of surface active warm mix asphalt mixture; In the process of Marshall compaction, the relative movement between aggregates was limited, and the test itself could not fully reflect the cooling effect of surface active warm mix. The forming temperature can not be determined according to the cooling experience of warm mixing agent in engineering application. It should be shaped according to the temperature of the hot mix; Using rotary compaction molding SMA mixture, under the condition of 140°C~155°C, 120 times of rotary compaction can ensure that the mixture can achieve a better compacting state, surface active warm mixing agent can reduce the molding temperature by 10~20°C.
Abstract: Warm mix asphalt has special viscosity characteristics, and the compaction mechanism is different from that of hot mix asphalt. It is necessary to investigate the compaction characteristics of warm mix asphalt by laboratory test. The compaction characteristics of surface active warm mix SMA mixture were determined by viscosive-temperature curve, ro...
Show More
