Roberts Gorden CRV-B-2 Manual Do Utilizador
CRV-S
ERIES
D
ESIGN
M
ANUAL
4
2.3 Fuel Savings and Comfort
Space heating can be accomplished with less input
capacity when a radiant heating system is utilized,
rather than with a conventional convective heating
system. Why is this so?
capacity when a radiant heating system is utilized,
rather than with a conventional convective heating
system. Why is this so?
A conventional, convective heating system, such as a
unit heater or central furnace works by heating the air,
which then indirectly heats the area and
occupants. CRV-Series utilizes infrared energy to heat
objects, people and surfaces directly, not the air. The
warm objects and floor create a heat reservoir, which
then re-radiates to the surroundings and also heats
the air by convection.
unit heater or central furnace works by heating the air,
which then indirectly heats the area and
occupants. CRV-Series utilizes infrared energy to heat
objects, people and surfaces directly, not the air. The
warm objects and floor create a heat reservoir, which
then re-radiates to the surroundings and also heats
the air by convection.
The radiant energy received by the occupants, directly
from the heater or indirectly from the
surroundings via re-radiation, serves to increase the
mean radiant temperature (MRT) of the space. In a
manner similar to direct sunlight, the increased MRT
allows the occupant to perceive a comfort condition at
a reduced air temperature. The resulting reduced air
temperature within the space provides the
following fuel-saving advantages:
from the heater or indirectly from the
surroundings via re-radiation, serves to increase the
mean radiant temperature (MRT) of the space. In a
manner similar to direct sunlight, the increased MRT
allows the occupant to perceive a comfort condition at
a reduced air temperature. The resulting reduced air
temperature within the space provides the
following fuel-saving advantages:
• Reduced stratification of air in the space.
• Reduced transmission heat loss due to lower tem-
perature inside than assumed design
condition.
condition.
• Reduced air change heat loss, to the extent that
exfiltration through cracks or openings near the
roof will be decreased because of decreased
stack effect.
roof will be decreased because of decreased
stack effect.
• Decreases the actual degree days experienced.