Calorie Calculation - YOKOGAWA Admag TI Series User Manual

5.5.6

Calorie Calculation

By obtaining the absolute temperature or the temperature difference from other product
(temperature transmitter, etc.) from MAO, the calorie calculation is executable.
The calorie is obtained using the following formula.
Q = c × V × ∆t
m
Q: Calorie [J/s]
c: Specific heat [J/kg•K]
V : Mass flow rate [kg/s]
m
∆t: Temperature difference [K]
The temperature difference of Δt varies depending on the MAO function set in Section 5.4. If the
temperature difference is selected, the temperature obtained in MAO is used. If the absolute
temperature is selected, a difference between the temperature obtained in MAO and the
reference temperature set in Subsection 5.1.10 is used.
["Temperature acquired by MAO" – "Set reference temperature"]
This function can be used only for AXG, not for AXW. The setting can be configured with the
following parameter.
Menu path
Display
F
OUNDATION
Fieldbus
Block Relative
Name Index
STB 106
The calorie calculation can be configured using the following procedures.
• When the temperature is selected as the external temperature input function:
(1) Set the function of the external temperature input function to the temperature by referring to
Section 5.4.
(2) Set the range high limit and low limit of the external temperature input by referring to Section
5.4.
(3) Set the reference temperature by referring to Subsection 5.1.10.
(4) Set the specific heat.
• When the temperature difference is selected as the external temperature input
function:
(1) Set the external temperature input function to the temperature difference by referring to
Section 5.4.
(2) Set the range high limit and low limit of the external temperature input by referring to Section
5.4.
(3) Set the specific heat.
Device setup ► Detailed setup ► Pro var ► Calorie ► (see below)
Device Configuration ► STB ► Device Configuration ► Configuration ► Process
Variables ► Calorie ► (see below)
Parameter
Display
Specific heat Specific Heat
<5. Functions>
F Fieldbus
OUNDATION
Description
Specifies the specific heat.
IM 01E21A02-03EN
88