IDM ¦ Technology/IT
36 · May/June 2022 ¦ international-dairy.com
Figure 1: The energy system of the
existing Tine dairy in Trondheim
consists of a process ice water supply
with four NH3 chillers, which
together have a capacity of 2,700 kW.
A transcritical CO2 heat pump with
a capacity of 160 kW is also installed
for hot water production. Furthermore,
a 300 m3 ice water storage tank
as a buffer, an electric heater for the
process hot water with 3,000 kW.
The newly added HTWP relieves the
process hot water production as well
as the ice water production.
Figure 2: Schematic design and simplified
T-s diagram of the R290/R 600 HTWP
Liquefier
Cacscade
Evaporator
Ice water
(0.5 °C/4 °C)
Cooling demand
NH3
cooler
CO2 heat
pump
HTHP
Storage
tank
0.5 °C
300 m³
Loss Heating requirement
Recooler Hot water
District heating
Oil burner
Electric heater
Hot process water
(95 °C/115 °C)
Heating demand
Temperature °C
Entropy kJ/kg
/international-dairy.com
