Installation manual

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Domestic Hot Water Preparation and Ventilation with Heat Pumps 6.4.1
tiresome, time-consuming and on account of today's typical work
and living habits totally infeasible.
Automatic room ventilation with heat recovery ensures that the
air that needs to be exchanged from both a hygienic and
constructional standpoint is exchanged in an energy-conscious
and economically feasible manner.
Advantages of domestic ventilation units
 Fresh, clean air without indoor air pollutants and excessive
humidity
 Automatic management of the required number of daily
ventilation procedures without requiring active assistance
 Reduced ventilation losses through
heat recovery
 Integrated filter for insects, dust and fine particle pollutants
 Screening of outside noise and increased
security because windows remain closed
 Positive evaluation according to the German Federal Energy
Efficiency Ordinance (EnEV)
The use of a mechanical domestic ventilation unit with heat
recovery is essential in many cases. The preferred type of waste
heat recovery should be clarified before making a decision
regarding which type of ventilation system to install.
It makes sense to use the exhaust air from the de-aeration and
ventilation of living quarters as an energy source for preparing
domestic hot water, because buildings require both ventilation
and hot water all year round. A second heat generator should
be integrated whenever hot water consumption is high.
6.4 Basic Principles for Planning Domestic Ventilation Systems
This chapter gives an insight into the principles for planning
domestic ventilation systems. The most important standards and
regulations to be observed are DIN 1946 (T1, T2, T6) and DIN
18017. These specify the necessary volume flows which are
used as a basis for planning the system. They are used to
dimension the ducting system, the ventilator, the heat recovery
system and other components.
Additional requirements:
 The air circulation in living quarters should not cause
discomfort. In particular, the incoming fresh air should not be
perceived as being a draught in parts of rooms where people
spend their time.
 Irritating sound transmissions should be reduced using
suitable measures (e.g. sound dampers, flexible, thermally-
insulated and sound-insulated Isoflex air hoses).
 Fire protection measures for ventilation systems must
comply with the relevant federal building codes. However,
no special fire protection measures are normally required in
the case of low-rise residential buildings (e.g. detached
house with up to 2 storeys).
 Kitchen extractor hoods and vented tumble driers may not
be connected to the domestic ventilation unit. It is better to
operate the extractor hood in recirculating air operation and
to use a condenser tumble dryer.
 Safety information
The air flow required for combustion in domestic fireplaces
(e.g. tile stoves) must be routed independently of the
ventilation system. A competent chimney sweep should be
involved in the planning of the system!
6.4.1 Calculation of the air volume
A plan showing the layout of the house and the use of the rooms
is required for planning the system.
This plan is used to divide up the different sections of the building
into fresh air, exhaust air and air overflow areas and to calculate
the volume flows for the individual rooms.
Fresh air areas: all lounges and bedrooms.
Exhaust air areas: bathrooms, WCs, kitchens and laundry
rooms.
Air overflow areas: all areas which are located between the
fresh air and exhaust air areas, e.g. hallways.
Proof of the number of air exchanges
The fresh air and exhaust air volume flows for controlled room
ventilation should be set so that the required number of air
exchanges can be carried out.
The number of air exchanges LW is the quotient of the exhaust
air volume flow and the room volume.
For example:
An air exchange figure of 0.5 per hour means that half of the
indoor air is replaced by fresh outside air in one hour or the total
indoor air is renewed every 2 hours.
NOTE
The German Federal Energy Efficiency Ordinance EnEV compares the
heat recovery using a ventilation system on the basis of a standard
system with an air exchange figure of 0.4[1/h].
Calculation of exhaust air volume flows
Table 6.1: Exhaust air volume flow according to DIN 1946, Part 6 and DIN
18017 “Lüftung von Bädern und Toiletten” [English: “Ventilation of
Bathrooms and WCs”]
Calculation of the fresh air volume flows
The sum of the calculated exhaust air volume flows must equal
the sum of the fresh air volume flows.
The volume flows of the individual rooms should be adjusted so
that the number of air exchanges is within the given limits, and
the fresh air volume flow equals the exhaust air volume flow.
Room
Exhaust air volume flow in m
3
/h
Kitchen 60
Bathroom 60
WC 30
Laundry room 30
Type of room
Air exchange
Min. Max.
Lounges/bedrooms 0,7 1,0
Kitchen/bathroom/WC 2,0 4,0