Accession Number : AD0818015

Title :   APPLICATION OF METHOD FOR PREDICTING THERMAL ERROR IN MEASUREMENT OF GROUND TEMPERATURE.

Descriptive Note : Technical rept.,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Rohsenow, Warren M.

Report Date : MAY 1967

Pagination or Media Count : 6

Abstract : This report illustrates the use of generalized charts in estimating the thermal error in measurement of ground temperature in the case of a probe inserted in a pit wall. The word 'ground' includes snow and ice as well as soil materials. Two major sources of error, other than instrument error, are inherent in this type of measurement. If the air temperature differs from the ground temperature heat will be exchanged between the air and side walls of the excavation as soon as the pit is opened. The ground temperature must be read before appreciable heat transfer occurs. A second error is introduced upon insertion of the temperature sensing element if the element temperature differs from the ground temperature. (Author)

Descriptors :   *TERRAIN), (*SURFACE TEMPERATURE, INSTRUMENTATION, PROBES, PREDICTIONS, ERRORS, GRAPHICS, ATMOSPHERIC TEMPERATURE, HEAT TRANSFER, MEASUREMENT, SNOW, ICE, PERMAFROST, SOILS.

Subject Categories : Snow, Ice and Permafrost
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE