Evaluation of high-efficiency heat-transfer techniques. Final report, 27 September 1978-30 September 1981
Single enhanced boiling tubes perform up to an order of magnitude better than single plain tubes, depending strongly on the type of surface and physical properties and operating conditions of the liquid. It is most pronounced at low temperature differences, then decreases and eventually disappears with increase of the temperature difference. The heat flux for a plain tube bundle is considerably greater than that for a single plain tube. Enhanced and finned tube bundles produce appreciable augmentation in heat flux compared to an identical plain tube bundle. The effect usually has most practical significance at low ..delta..T. The augmentation for enhanced tube bundles is less than the augmentation for single tubes, due mainly to the relatively more pronounced convective transfer for plain tubes. Although the cost of enhanced tubes is always higher, their advantage lies not only in smaller units required but, most importantly, that enhanced tubes will produce nucleate boiling at very low temperature differences where plain tubes would not. (Thus, heat recovery is possible in cases which otherwise would have to be rejected). The advantages of enhanced boiling tubes are not only in smaller size of the exchangers, but, in process loops involving compressors, operation of the typical low temperature boiler/condenser at a lower temperature difference, thus resulting in substantial savings in compressor size and energy consumption. Increased application of enhanced boiling surfaces will be realized as less expensive techniques of manufacture become commercially available. Three abstracts are entered separately.
- Research Organization:
- Heat Transfer Research, Inc., Alhambra, CA (USA)
- DOE Contract Number:
- AC22-78ET13328
- OSTI ID:
- 5188331
- Report Number(s):
- DOE/ET/13328-T2; ON: DE82007780
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMPRESSORS
ENERGY CONSUMPTION
HEAT EXCHANGERS
DESIGN
PERFORMANCE TESTING
HEAT TRANSFER
NUCLEATE BOILING
TEMPERATURE EFFECTS
TEST FACILITIES
WORKING FLUIDS
COST
EXPERIMENTAL DATA
FABRICATION
HEAT FLUX
HEAT RECOVERY
LEADING ABSTRACT
SIZE
SURFACE PROPERTIES
SURFACE TREATMENTS
TUBES
ABSTRACTS
BOILING
DATA
DOCUMENT TYPES
ENERGY RECOVERY
ENERGY TRANSFER
FLUIDS
INFORMATION
NUMERICAL DATA
PHASE TRANSFORMATIONS
RECOVERY
TESTING
420400* - Engineering- Heat Transfer & Fluid Flow