Crestron DV-320-K Instrukcja Użytkownika Pobierz pdf (Strona 31)

For a better illustration of what lies behind

building automation functions and how

energy can be saved, examples of building

automation functions in an ofﬁ ce with energy

efﬁ ciency class A are described below.

Technical equipment of an ofﬁ ce

Illumination consists of one lighting strip

on the corridor side and one on the window

side. The lights are held at a constant

room brightness level via DALI (constant

light control), depending on the amount

of daylight. A room brightness sensor is

mounted in the ceiling. An occupancy sensor

is installed for needs-dependent management

and control of the entire room.

The ofﬁ ce is shaded by means of two

electrically operated, externally mounted

louvre blinds. Two buttons are installed for

manual control of the blinds.

To heat the room, a radiator is present.

The ofﬁ ce is cooled via a cooling ceiling.

An actuator is located on the radiator and

on the cooling ceiling respectively. The room

temperature is monitored and the desired

room temperature is adjusted locally using

EnOcean radio technology.

For ventilation, the ofﬁ ce is connected to

an air-conditioning installation. Volume ﬂ ow

is variable. The open state of the window is

captured via a digital input; so too is the dew

point sensor on the cooling ceiling.

Heating/cooling function

To minimise energy use for room

heating and cooling, the desired room

temperature is determined via a scheduler-

dependent energy level selector (see ﬁ g. 1,

page 30, and ﬁ g. 2, page 31). In the case of

long absences, e.g. during shut-down periods,

the ofﬁ ce is switched to “Protection”, the

lowest energy level, to prevent damage

caused by frost or overheating. For brief

absences, e.g. at night or on weekends, the

ofﬁ ce is set to “Economy” mode. Only at the

start of core working time is the energy level

raised to the level “Pre-Comfort”. The room

temperature is now almost up to the comfort

target value. Only when persons are detected

in the room is “Comfort” mode activated and

the appropriate set value reached in a short

time.

The system switches from “Economy”

to “Pre-Comfort” mode as late as possible

via the energy level selector with start

optimisation. The optimum activation time

is calculated by the building automation

system.

The opening of the window is monitored

by a window contact. If the window is open,

the system automatically switches to the

“Protection” energy level. This automatically

stops unnecessary energy consumption due

to a window being opened.

The room temperature set values for all

four energy levels are provided by the room

climate function set value calculation for

heating and cooling.

Ofﬁ ces according to energy efﬁ ciency class A

Use in room automation

In room automation, sensors are implemen-

ted depending on their function and not on

the individual building system. This saves on

hardware and cabling costs as early as in the

system installation phase. The reduction in

cabling also has a positive spin-off effect on

ﬁ re loads and building statics.

To achieve energy efﬁ ciency class A in

accordance with EN 15232, Beckhoff offers

a software library based on room automation

guideline VDI 3813.

Comprehensive room automation exploi-

ts the interdependencies of facade

control, illumination and climate control to

create a pleasant room climate. At the same

time, efﬁ cient room and zone control also

affects the primary systems: the heating and

cooling requirements and the air quantities

are regulated according to need. When desi-

gning the heating, cooling, ventilation and air

conditioning systems, the needs

arising from the speciﬁ c use of the building

must be taken into account. A further beneﬁ t

lies in the way in which a majority of the

optimisation functions can be realised within

the software on a single system during

commissioning and ongoing operations. As

a result, no reconstruction work impedes

operation and the time required for software

adjustment also remains within reasonable

limits. In certain cases, many modiﬁ cations

can be made by accessing the system remot-

ely, without the need for a service technician

to attend in person.

The adjacent matrix shows the interplay of

the individual building systems with regard

to the sensors used. For energy efﬁ cient auto-

mation, all individual building systems must

be controlled and managed from a single

system.

Interaction o

building system

ensor syste

HVA

htin

Solar shadin

Secur

oba

Monitoring

ight intensity

oom tem

erature

Occupanc

Window contact

oom operating

evice

eat

(

wind/rain

)

Outside

temperature

Solar radiation

New Automation Technology

BECKHOFF

We reserve the right to make technical changes.

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