Improvement of the Performance of Solar Energy or Waste Heat Utilization Systems by Using Phase-Change Slurry as an Enhanced Heat-Transfer Storage Fluid

1985 ◽  
Vol 107 (3) ◽  
pp. 229-236 ◽  
Author(s):  
K. E. Kasza ◽  
M. M. Chen
Keyword(s):  
Heat Transfer ◽  
Solar Energy ◽  
Phase Change ◽  
Single Phase ◽  
Waste Heat ◽  
Storage Tanks ◽  
Enhanced Heat Transfer ◽  
Heat Utilization ◽  
Waste Heat Utilization ◽  
Pumping Rates

This paper is concerned with the benefits of using phase-change slurries as enhanced heat-transfer/storage working fluids in solar energy and waste heat utilization systems. Literature is cited to show that a slurry containing a phase-change material as the dispersed phase promises to have much higher heat-transfer coefficients than conventional single-phase working fluids. Because of the latent heat, the phase-change slurry also requires lower pumping rates and smaller storage tanks than single-phase fluids for the same energy content. These benefits are documented by comparisons of temperature drops, pumping rates, pumping powers, and the sizes of storage tanks for a generic energy collection system operating with and without a slurry.

scholarly journals Beneficial Reuse of Industrial CO2 Emissions Using a Microalgae Photobioreactor: Waste Heat Utilization Assessment

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2634 ◽  
Author(s):  
Daniel T. Mohler ◽  
Michael H. Wilson ◽  
Zhen Fan ◽  
John G. Groppo ◽  
Mark Crocker
Keyword(s):  
Heat Transfer ◽  
Power Plant ◽  
Biomass Production ◽  
Waste Heat ◽  
Point Sources ◽  
Production Costs ◽  
Transfer Coefficients ◽  
Wind Speeds ◽  
Heat Utilization ◽  
Waste Heat Utilization

Microalgae are a potential means of recycling CO2 from industrial point sources. With this in mind, a novel photobioreactor (PBR) was designed and deployed at a coal-fired power plant. To ascertain the feasibility of using waste heat from the power plant to heat algae cultures during cold periods, two heat transfer models were constructed to quantify PBR cooling times. The first, which was based on tabulated data, material properties and the physical orientation of the PBR tubes, yielded a range of heat transfer coefficients of 19–64 W m−2 K−1 for the PBR at wind speeds of 1–10 m s−1. The second model was based on data collected from the PBR and gave an overall heat transfer coefficient of 24.8 W m−2 K−1. Energy penalties associated with waste heat utilization were found to incur an 18%–103% increase in energy consumption, resulting in a 22%–70% reduction in CO2 capture for the scenarios considered. A techno-economic analysis showed that the cost of heat integration equipment increased capital expenditures (CAPEX) by a factor of nine and increased biomass production costs by a factor of three. Although the scenario is thermodynamically feasible, the increase in CAPEX incurs an increase in biomass production cost that is economically untenable.

A Livestock Model for Waste Heat Utilization Assessment

1989 ◽  
Vol 19 (3) ◽  
pp. 211-229 ◽  
Author(s):  
Robert N. Amundsen ◽  
John D. Keenan
Keyword(s):  
Waste Heat ◽  
Heat Utilization ◽  
Waste Heat Utilization

Assessment of Waste Heat Utilization Technologies: Overview

1989 ◽  
Vol 19 (2) ◽  
pp. 95-114 ◽  
Author(s):  
John D. Keenan ◽  
Robert N. Amundsen
Keyword(s):  
Waste Heat ◽  
Heat Utilization ◽  
Waste Heat Utilization
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