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Sizing Aircooler

This document provides information for sizing an aircooler, including: - Refrigerant and air conditions for a propane refrigeration system, with 9,166 lb/h of refrigerant at 138.9°F entering and 113°F exiting the aircooler. - Calculations of heat transfer rates including 119,158 BTU/h for desuperheating and 1,170,498 BTU/h for condensing. - Specifications for the tubes, fins, ducting and fans of the aircooler design.

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94 views4 pages

Sizing Aircooler

This document provides information for sizing an aircooler, including: - Refrigerant and air conditions for a propane refrigeration system, with 9,166 lb/h of refrigerant at 138.9°F entering and 113°F exiting the aircooler. - Calculations of heat transfer rates including 119,158 BTU/h for desuperheating and 1,170,498 BTU/h for condensing. - Specifications for the tubes, fins, ducting and fans of the aircooler design.

Uploaded by

pettypatel
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as XLSX, PDF, TXT or read online on Scribd
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Sizing Aircooler

Vapor superheated (refrigerant) comes from compressor to aircooler. Conditions P=208.6psig y T=138.9°F

Refrigerant Propane Temp. IN Air 77 °F


Refrigerant flow 9,166 lb/h Temp. OUT Air 85 °F
Enthalpy superheated vapor -1,004 BTU/lb Temp. Refrig. IN 138.9 °F
Enthalpy saturated vapor -1,017 BTU/lb 251.9 Temp. Refrig. OUT 113 °F
Enthalpy Latent Heat 127.7 BTU/lb 125.95 Temp. (dew point) air 84.3 °F
Desuperheating heat 119,158 BTU/h
Condensing heat 1,170,498 BTU/h
Total heat 1,289,656 BTU/h

Air Properties (Taverage = 77.5°F) Propane properties for condensing (T =113°F)

viscosity 0.0463 lb/pie.h viscosity 0.0821 lb/pie.h


heat capacity 0.2373 BTU/lb.°F Sp-Gr 0.4588
conductivity 0.01454 BTU/h.pie.°F conductivity 0.04807 BTU/h.pie.°F

Tube feature Fin feature

External diameter 1 in Fin high 0.375 in


Internal diameter 0.870 in Fin width 0.035 in
Lenght 24 ft Fin density 8 8 aleta/in
Arrangment Triangular Material Aluminium
Spacing ∆ 2.375 in Fin conductivity 117 BTU/h.pie.°F

Duct Size External diameter finned 1.75 in


Air Flow 679338.49558 lb/h
Width 12 ft yb 0.00146 ft
Lenght 24 ft re/rb 1.75
Internal Surface Area 0.228 ft2/ft
Propane properties for desuperheating (Taverage =126°F) L/Di 331
Fin spacing 0.625 in
viscosity 0.0241 lb/pie.h
heat capacity 0.5081 BTU/lb.°F Type Forced draft
conductivity 0.0134 BTU/h.pie.°F # Fans 2

Calculations

Fin Area 310.9 in2/ft de 1.335 in


Bare tube Area 27.1 in2/ft De 0.111 ft
Total 338 in2/ft D 0.0725 ft
Projected perimeter 161.3 in/ft # tubes/row 59.6 tubes/row

Duct Side (air) Tube Side (propane)

Free area for air 20,563 in2 Area for propane 35.6500 in2
Free area for air 142.80 ft2 Area for propane 0.2476 ft2
Gs 4,757 lb/h.ft2 G 37,024 lb/h.ft2
Re 11,419 Gráfic 16.18 Re 32,695 Gráfic 10-46
JH 74 JH 105
hi desuperheating 18.8 BTU/h.ft2.°F

ho air 8.8 BTU/h.ft2.°F G''' 19.1 lb/h.ft


hi condensing 240 BTU/h.ft2.°F
(re-rb)*(ho/Kfin*yb)^0.5 0.225
Ω 0.97 Gráfic
h'fi 88 Coefficient referred to the internal area

UD Calculated(condensing) 65 BTU/h.ft2.°F LMTD condensing 32.2 °F


Internal surface/row 328 ft2 Ai (By design equation) 562.3 ft2

UD Calculated(desuperheating) 6 LMTD desuperheating 40.0 °F


Internal surface/row 328 ft2 Ai (By design equation) 496.1 ft2

Number of Rows 3.23 rows


http://www.hudsonproducts.com/products/finfan/index.html
http://www.cheresources.com/invision/index.php
http://www.hudsonpro.../ACHE2Setup.exe
http://www.hudsonpro...5.7%20setup.exe

60
Gráfic 16.67A

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