A Method for Determining Oil-Cooler Performance Requirements in Series Operation
Abstract
An equation has been developed by which the over-all performance of any number of oil coolers when operating in series can be related to their performance when operating singly. This relation is of value to the designer of power-plant installations in determining the individual performance required of identical coolers connected in series to obtain a desired over-all performance. The method is strictly applicable only when there is no oil diversion and when the heat-transfer coefficients on the oil side of the individual coolers to not vary with inlet oil temperature with the coolers in series. A comparison was made of the experimental over-all performance of two conventional type 15-inch-diameter oil coolers, selected according to the analysis and equipped first with spring-loaded valves and then with rotary valves, with the desired over-all performance. The results showed close agreement between theory and experiment in the region of full oil flow through the cooler cores and in the region where heat-transfer coefficients were not affected by inlet oil temperature and confirmed the anticipated deviations at conditions favorable to oil diversion and variation in heat-transfer coefficients. The analysis made is considered applicable in the range of performance that is important in the design of oil-cooler installations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1945
- Accession Number
- ADA801332
Entities
People
- H. Boyet
Organizations
- National Advisory Committee for Aeronautics