Technical data

1.3.2
6
1.3.2 Maximum Cooling Capacity of the Heat Pump
If the maximum required cooling capacity of a building is already
known (see also Chap. 1.2 on p. 3), it should be checked to
ensure that the heat pump can supply this refrigerating capacity
for the required boundary conditions. It is particularly important to
check the operating limits of the particular type of heat pump
used.
The cooling capacity of a reversible air-to-water heat pump is
chiefly dependent on the required flow temperature and the
outside air temperature. The higher the flow temperature and the
lower the external temperature, the greater the cooling capacity
of the heat pump.
For example:
What cooling capacity is available according to the output curve
in Fig. 1.4 on p. 6 at a max. external temperature of 35 °C?
Fig. 1.4: Cooling capacity of a reversible heat pump (see also Chap. 4.6 on
p. 16)
According to Fig. 1.4 on p. 6, this yields the following maximum
cooling capacities based on flow temperatures in cooling
operation:
1.3.3 Measures to Reduce the Cooling Load of the Building
The building's cooling load is calculated by adding up the cooling
loads of the individual rooms. If this sum exceeds the available
cooling capacity, make a check of the following:
 Can the cooling load be reduced through simple building
measures (e.g. by using external sunblinds)?
 Can the same cooling capacity also be supplied at higher
flow temperatures by increasing the surface area of the heat
exchanger?
 Are the calculated maximum cooling loads of the individual
rooms actually to be calculated as being simultaneous,
because, for example, rooms on the east and west sides are
not heated simultaneously by solar radiation?
 Can the cooling load be reduced during the day by cooling
parts of the building's structure at night (thermal activation of
structural building parts)?
If despite these measures, the cooling capacity of the heat pump
is still not sufficient, rooms with high heat loads can be equipped
with supplementary air conditioners. For reasons of energy
efficiency, these air conditioners should only operate when the
heat pump can not cover the total cooling load.
Type of heat pump Flow temp.
Cooling
capacity
Air-to-water 18°C 14.3 kW
Air-to-water 8°C 10.7 kW
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