REMKO PWW Series - Manual (Page 32)

32
REMKO PWW
Planning • Calculation • Units
We reserve the right to make changes to dimensions and design in the interest of technical advances.
■ Total heat requirement of room
to be heated.
■ Number of units necessary to
cover the heat requirement and
to also ensure sufficient fine heat
and air distribution in the room.
In any event, it is advantageous
to use several smaller units in or-
der to achieve a more favourable
temperature distribution, lower
air velocities and a lower noise
level.
■ Required mode of operation
(circulation, mixed-air or fresh
air operation).
■ Mounting site (wall or ceiling).
■ Permissible sound pressurelevel.
■ Air inlet temperature in accessed
areas
(guide value = 35-40°C).
■ Circulated total air flow in
relation to volume
(guide value 2-3-fold air
circulation).
■ Mixed-air or fresh-air that utilise
the required fresh air volumes
for the number of air changes
necessary for the room size.
■ Horizontal and vertical penetra-
tion depth of air blast required
to provide sufficient heat in the
room.
Planning and selection criteria
Determination of the required heat output, fresh air volume and air outlet temperature
Heat capacity: The heating capacity Q of the REMKO heater takes into account the following components:
1. Heat requirement Q
H
of room to be heated. (Calculation according to DIN 4701 and 4108)
2. Heat requirement Q
AL
to heat fresh air to room temperature.
Fresh air volume:
The required fresh air volume V
AL
de-
pends on the system requirements and
building regulations.
Air outlet temperatures: Note:
Extreme air outlet temperatures can produce uneven heat distribution and tempera-
tures in the room. In order to provide comfortable conditions in accessed areas, we
recommend the following max. air outlet temperatures:
Comfort range 30-40°C / Industrial range 35-45°C
The data shown in the ratings tables take into account the following values:
Type of room Air changes x per hour Noise level dB(A)
Workshop, general 3 .... 6 70 .... 80
Warehouses 2 .... 4 60 .... 70
Textile industry 4 .... 20 about 90
Pickling shop, dye shop 5 .... 15 60 .... 70
Office rooms, small businesses 4 .... 8 about 45
Garages 4 .... 5 60 .... 70
Canteen kitchens 10 .... 30 50 .... 60
Large sales rooms, supermarkets 8 .... 10 about 60
Tennis halls 1 .... 2 45 .... 55
The following values are guide values and recommendations from the technical literature
Q
AL
= V
AL
· c
PL
· f
L
· (t
L2
- t
L1
) in [kW]
Q = Q
H
+ Q
AL
in [kW]
V
AL
= X · L · W · H in [m 3 /h]
t
L1
[ °C ] -15 -10 0 +15 +20
f
L
[ ] 1.37 1.34 1.29 1.23 1.20
kg
m
3
as well as the specific heat capacity C
PL
of air with 1 kWs
kg · K at constant air pres-
sure of 1013 hPa