primary/secondary buffer tanks improve system efficiency by preventing
the problem of short cycling boiler(s).
water content boilers operating at low loads will short cycle
leading to sooting, premature component failure, and nuisance
shut downs. If the boiler is allowed to fire for a minimum of
several minutes the full efficiency of the boiler can be achieved
preventing sooting, premature component failure, and nuisance
Boiler systems are sized to heat the building on the coldest days.
When the outside temperature is above minimum outside design conditions
the boiler may only require a short period of firing to warm the
building causing short cycling of the boiler. Installing a Primary/Secondary
buffer tank prevents this short cycling. Many boiler manufactures
do not recommend firing the boiler(s) more than 6 cycles per hour.
primary/secondary buffer tanks remove air from the heating system,
thus eliminating a separate air separator.
Boiler systems require a low velocity area in the system to allow
entrained air to be separated from the boiler water. A Primary/Secondary
Buffer tank will have extremely low velocity and is used as the
air separator, thus eliminating the need for a separate air separator.
primary/secondary buffer tanks act as a hydraulic separator by
separating the primary and secondary sides of the boiler system.
The primary/secondary hydraulic separator allows for variable
volume systems to operate with the modern boiler as instructed
in ASHRAE 90.1.
Cemline Primary/Secondary buffer tanks come complete with insulated
jackets [R-12.5] with Velcro closures for simple field installation.
Cemline Primary/Secondary buffer tanks have a well to accept Building
automation system or customer supplied temperature sensors. As
an option a factory supplied digital electronic thermostat can
be supplied to cycle the boilers on call for heat. This digital
electronic thermostat has a LCD temperature display and can be
easily field programmed for a minimum of 2 oF
and maximum of 30 oF
The SEBs are vertical tanks, which come in 120, 200, 300, and
500-gallon capacities. The standard options on an SEB include
ASME Pressure vessel (125 psi working pressure @400 F), an air
vent, a field installed insulated jacket, and thermometer. Optional
equipment is a digital electronic programmable thermostat.