Technical data

www.dimplex.de 01.2012 | Project planning manual for heat pumps for heating and domestic hot water preparation | 7
Literature
Heating system
The heating system has a significant influence on the efficiency
of the heat pump heating system and should function at the low-
est possible flow temperatures. It consists of the system used for
conveying the heat transfer medium from the warm side of the
heat pump to the heat consumers. In a detached house, for ex-
ample, it consists of the piping for heat distribution, the low-tem-
perature heating system and/or the radiators, and includes all
auxiliary equipment as well.
Heat pump system
A heat pump system consists of the heat pump and the heat
source system. Heat source systems for brine-to-water and
water-to-water heat pumps must be separately tapped.
Heat pump heating system
Complete system consisting of the heat source system, the heat
pump and the heating system.
Heat source
Medium from which heat is extracted with the heat pump.
Heat source system
System for the extraction of heat from a heat source and the con-
veyance of the heat transfer medium between the heat source
and the heat pump including all auxiliary equipment.
Heat transfer medium
Liquid or gaseous medium (e.g. water, brine or air) with which
heat is conveyed.
Wall heating
Wall heating has water flowing through it and functions like a
large radiator. It has the same advantages as underfloor heating.
As a rule, a temperature of 25 °C to 28 °C is sufficient for the
heat transfer which is mainly supplied to the rooms in the form of
radiant heat.
Literature
RWE Energie Bau-Handbuch (12. Ausgabe), VWEW VLG U.
Wirtschaftsgesellschaft, ISBN 3-87200-700-9, Frankfurt 1998
Ramming, Klaus: Bewertung und Optimierung oberflächennaher
Erdwärmekollektoren für verschiedene Lastfälle, ISBN-13 978-3-
940046-41-3, 2007
Breidert, Hans-Joachim; Schittenhelm, Dietmar: Formeln, Tabel-
len und Diagramme für die Kälteanlagentechnik A. MUELLER
JUR.VLG.C.F., ISBN 3788076496, Heidelberg 1999
DIN Deutsches Institut für Normung e.V., Beuth Verlag GmbH,
Berlin.
VDI-Richtlinien – Gesellschaft technische Gebäudeausrüstung,
Beuth Verlag GmbH, Berlin.
Symbols
Size Symbol Unit Additional units (definition)
Mass mkg
Density ρ
kg/m
3
Time t
s
h
1 h = 3600 s
Volume flow
m
3
/s
Mass flow kg/s
Force F N
1 N = 1 kg m/s
2
Pressure p
N/m
2
; Pa
1 Pa = 1 N/m
2
1 bar = 10
5
Pa
Energy, work, heat (quantity) E, Q
Y
kWh
1 J = 1 Nm = 1 Ws = 1kg m
2
/s
2
1 kWh = 3600 kJ = 3.6 MJ
Enthalpy HY
(Heat) output
Heat flow
P,
W
kW
1 W = 1 J/s = 1 Nm/s
Temperature T
K
°C
Absolute temperature, temperature difference
Temperature in °Celsius
Sound power
Sound pressure
L
WA
L
PA
dB(re 1pW)
dB(re 20μPa)
Sound pressure level, sound power level
Efficiency η -
COP ε (COP) - Output figures
Performance factor ß e.g. seasonal performance factor
Specific heat content c J/(kg K)
9
0
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