scholarly journals Exergoeconomic analysis of staggered tube cross-flow heat recovery unit incorporated into industrial air-compressor for process water heating

2020 ◽  
Vol 7 ◽  
pp. 100055
Author(s):  
Richard Opoku ◽  
Charles K.K. Sekyere ◽  
Solomon Ackumey ◽  
Obed Y.W. Abotsi ◽  
John P. Kizito
Keyword(s):  
Heat Recovery ◽  
Cross Flow ◽  
Process Water ◽  
Water Heating ◽  
Air Compressor ◽  
Recovery Unit ◽  
Flow Heat ◽  
Exergoeconomic Analysis

Heat Transfer Properties and Energy-Exergy Efficiency in a Finned Cross-Flow Heat Recovery Unit

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
Isak Kotcioglu ◽  
Ahmet Cansiz
Keyword(s):  
Heat Transfer ◽  
Heat Recovery ◽  
Cross Flow ◽  
Exergy Loss ◽  
Entropy Generation Number ◽  
Recovery Unit ◽  
Transfer Unit ◽  
Flow Heat ◽  
Inlet Conditions ◽  
Transfer Properties

In this study, a cross-flow heat recovery-exchanger system operating with unmixed fluids was manufactured and tested. The thermodynamic analysis of the system was presented via determining the variations of exergy loss with Reynolds number. The analysis also included the effects of convergent and divergent plate-type winglets on heat transfer properties of the designed system. Experimental tests consisted of temperature and pressure drop measurements for the Reynolds numbers (3000 and 12,000) according to the working conditions of the boiler, fan, preheater, and reheater. The effects of inlet conditions of the working fluids on the heat transfer characteristics were correlated via entropy generation number and exergy loss. The variation of the effectiveness with the number of transfer unit of heat recovery unit was calculated and discussed in terms of literature.

scholarly journals Annual Energy Performance of an Air Handling Unit with a Cross-Flow Heat Exchanger

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1519
Author(s):  
Piotr Michalak
Keyword(s):  
Heat Exchanger ◽  
Heat Recovery ◽  
Energy Savings ◽  
Cross Flow ◽  
Energy Performance ◽  
Net Energy ◽  
Heating And Cooling ◽  
Air Handling Unit ◽  
Temperature Efficiency ◽  
Flow Heat

Heat recovery from ventilation air is proven technology resulting in significant energy savings in modern buildings. The article presents an energy analysis of an air handling unit with a cross-flow heat exchanger in an office building in Poland. Measurements were taken during one year of operation, from 1 August 15 to 31 July 16, covering both heating and cooling periods. Calculated annual temperature efficiency of heat and cold recovery amounted to 65.2% and 64.6%, respectively, compared to the value of 59.5% quoted by the manufacturer. Monthly efficiency of heat recovery was from 37.6% in August to 68.7% in November, with 63.9% on average compared to 59.5% declared by the manufacturer. Cold recovery was from 63.3% in April to 72.8% in September, with 68.1% annually. Calculated recovered heat and cold amounted 25.6 MWh and 0.26 MWh, respectively. Net energy savings varied from −0.46 kWh/m2 in August, when consumption by fans exceeded savings, to 5.60 kWh/m2 in January.

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