16
CLEAR
Clears NO CIRC display after correction
nergy calculation -
Energy gain is calculated by obtaining the
temperature increase of heat transfer fluid across the solar collector. The amount
of fluid flow through the collector is registered by an in-line flow meter. USDT
2004 computes the energy production as a function of the temperature
differential and fluid volume. In addition, the system anti-freeze (Glycol)
percentage should be entered as it affects the thermal conductivity and heat
transfer rate.
BTU
Energy calculation mode
S IN
Sensor port selection for inlet temperature (1, 2, 3, --)
S OUT
outlet temperature
(1, 2, 3, --)
F SEN
Sensor port selection for flow rate (1, 2, 3, --)
Energy calculation will be initiated only after temperature sensor ports are
designated. Flow rate can be either a constant number to be entered by user, or
from a flow meter input. To activate the energy calculation without using the flow
meter's impulse input, a dash (-) must be selected for F SEN channel followed by
the constant flow rate in gph (gallon per hour) unit.
LLP
Flow meter rate impulse number in liter per pulse, if flow meter is
used
GAL
Constant flow rate in gph instead of flow meter reading in (--)
sensor mode
GLYCOL
Anti-freeze percentage
CLEAR
Sets the BTU meter's counter to zero
DIF
Sensor calibration
The output of USDT 2004 unit is kW for system power and kWh or MWh for
collected energy.
The energy calculation dependents on flow meter accuracy, the temperature
sensors class, and their locations. The flow meter is a mechanical device and its
accuracy fluctuates over time. Therefore, the user should calibrate the flow meter
and incorporate temperature sensor tolerance.
The supplied Thermistor sensor has an accuracy of ± 2
o
F. The PT1000 sensor
offers a better accuracy of ± 1
o
F.
DIF
represents the temperature difference
between two sensors. User can increase the accuracy of reading by adjusting the
DIF parameter. The energy calculation becomes accurate at temperature range
that this reading adjustment is made.
E
