batch solar heater
A batch solar heater, also known as a bread box system or integral collector
storage system, is a simple solar
collector consisting of one or more storage tanks placed inside an insulated
box that has a glazed side facing the sun. Because the storage tank and
the solar absorber act as a single unit, there is no need for other components.
A batch collector is mounted on the ground or on the roof (in which case,
the roof structure must be strong enough to support it).
|Passive, batch solar water heater: Cold water enters
a pipe and can either enter a solar storage/backup water heater tank
or the batch collector, depending on which bypass valve is opened.
If the valve to the batch collector is open, a vertical pipe (which
also has a spigot drain valve for cold climates) carries the water
up into the batch collector. The batch collector is a large box holding
a tank and covered with a glaze that faces the sun. Water is heated
in this tank, and another pipe takes the heated water from the batch
collector into the solar storage/backup water heater, where it is
then carried to the house
Some batch heaters use "selective" surfaces on the tank(s). These surfaces
are good absorbers of solar infrared radiation but inhibit radiative loss.
On an area basis, batch collector systems are less costly than glazed flat-plate
collectors but also deliver less energy per year.
ENERGY AND POWER