Cemline developed Storage Plate Heaters to work with condensing hydronic boilers. The plate heat exchanger allows the boiler water temperature drop to be as great as 100°F allowing the water heater to use less gallons per minute of boiler water than a traditional U-bend coil water heater. The Storage Plate Heater is a perfect fit for solar water applications because the plate heat exchanger offers high efficiencies, compact size, and close approach temperatures.
The Solar Water Heater is a dual energy source unit using either boiler water, steam, or electric as the back-up energy source for times when solar energy is not enough or unavailable. Boiler water applications use a brazed plate heat exchanger or a U-Bend submerged coil. Steam applications use a U-Bend submerged coil, and electric
applications use incoloy immersion electric elements (208, 220, or 480 VAC).
NOTE: Solar collectors and solar pumps are supplied and installed by others in the field.
OPERATION SEQUENCE
Solar Only SW1—Solar water sensor from solar panel DS1 —Domestic tank water sensor SW2—Solar water sensor to solar panels SWP—Solar water pump DWP—Domestic water pump
SWP + DWP turns ON if the temperature
difference (Delta T between SW1-DS1) is
15° F or greater.
SWP + DWP turns OFF if the Delta T
decreases to 5° F or lower.
Dump valve will open when the tank
temperature reaches 170° F allowing cold
water to enter tank and reduce solar
panel temperature. Dump valve will close
when tank temperature falls below 165° F.
The Solar Heater can also be used to
recover energy from condensate systems.
In this application, the solar water pump
would be replaced by a condensate
pump with receiver (CP).When the CP
receiver fills, the CP and the DWP turn ON
and when the receiver empties the CP and
DWP are turned OFF. This is can be used to
recover energy before dumping the condensate
to drain or sending condensate
back to the boiler feed system to make
pre-heat hot water or used in combination
with boiler water, steam, or electric energy
sources in one vessel.
Solar / Boiler Water SW1—Solar water sensor from solar panel DS1 —Domestic tank water sensor SW2—Solar water sensor to solar panels SWP—Solar water pump DWP—Domestic water pump CT1 —CEM-TROL® Sensor 1
operating temperature CT2 —CEM-TROL® Sensor 2
high limit temperature
SWP + DWP turns ON if the temperature
difference (Delta T between SW1-DS1) is
15° F or greater.
SWP + DWP turns OFF if the Delta T
decreases to 5° F or lower.
Dump valve will open when the tank
temperature reaches 170° F allowing cold
water to enter tank and reduce solar
panel temperature. Dump valve will close
when tank temperature falls below 165° F.
The CEM-TROL® controller will be set to
maintain a set point on the top 1/3 of the
tank, typically between 120-140° F, for times
when solar heater is offline or unable to
keep up with the demand. CEM-TROL®
modulates control valve open/closed
aloowing boiler water/steam to enter heat
exchanger maintaining desired setpoint.