Project Title:

Fluid Temperature Determination From Surface Temperatures and Heat Fluxes

RdF Corporation
23 Elm Avenue
P.O. Box 490
Hudson, NH 03051-0490

93-1  13.11   5195    __      AMOUNT REQUESTED $69,640.00

Fluid Temperature Determination From Surface Temperatures and Heat Fluxes

Abstract:

Fluid temperature in a piping system can be accurately determined
non-intrusively with pipe surface temperature and its correction
factor. A new technique, called flux augmented surface temperature
(FAST) method is proposed to determine the correction factor
directly in real time, in situ. The correction factor is directly
proportional to a heat flow through pipe wall. In FAST method, the
proportional coefficient is directly calculated from 2 sets of
surface temperature and heat flux measurements. Innovation in FAST
method is a technique which creates 2 different thermal
environments. These environments produce significantly different
surface temperature and heat flow from each other, but they will
leave no residual thermal disturbance to fluid or pipe. In FAST
method, there are 2 heat flux sensors, both which can measure
surface temperature and heat flux simultaneously. These sensors are
equipped with heater and/or cooler, which are dynamically
controlled in such a way that no heat will be generated or absorbed
as net. FAST method is expected to produce response time and
temperature accuracy comparable to a direct immersion method. FAST
method and its heat flux sensor can be used many commercial
applications as well as NASA rocket test facility, because of its
easy installation.

Three different types of non-intrusive fluid temperature sensors
for piping systems with different ranges of price, accuracy and
response time for hazardous waste treatment, pharmaceutical and
biomedical industries and up-grading for general chemical, process
and food-processing industries. New resistance type heat flux
sensors with better accuracy and sensitivity for general industrial
applications.

Temperature, Surface, Heat, Flux, Sensor, Measurement, Detector,
Fluid