The system consists of six mobile training stands
Training stand 1: Geothermal energy source or floor heating
This training stand can be used as a source of heat in the configuration "Brine
heat pump" (training stand 5) or as the heat sink in combination with the heat pump
or the solar heat stand (training stands 3 and 4).
Operation with or without filling with water is possible here!
200-litre water tank
3 pipe systems (10, 20 and 30 metres in length)
Integrated hot-medium meters to measure the overall flow, the hot and the cold
outputs as well as the admission and return temperatures
Bypass valve between the heating circuits for the experiments to bypass the three
Experiments on "hydraulic adjustment" with the three pipe systems routed in parallel
using the volumetric flowmeters and throttle valves
Training stand 2: Fan convector as source or sink
Both the source of energy and the energy sink with discharge of warm air can be
realised with the fan convector in these experiments.
Fan power in the air throughput up to 2300 m³/h
Heating power up to 22.4 kW at 90/70/20°C
Adjustable cooling performance from 3 to 5.4 kW at 7/12/27°C
Continuous throttle action in the hydraulic circuit by turning valves on the convector
Series of experiments to optimise the energy between the heating power available
from the heating circuit and the energy conveyed from the convector to the air
in the room
Integrated hot-medium meter
Training stand 3: Solar collector with solar simulation
The main components of this training stand are the flat plate collector, the solar
heat regulator and the circulation pump
Clear glass collector with copper absorber (collector area 0.93 m³, liquid content
0.9 litre, flow from left or right, standstill temperature to about 185 °C)
System regulator with diverse regulating functions and energy measuring / sensing
for the functional value using an erasable memory device for the data
High-efficiency pump (minimum power input 5.8 W and maximum delivery height 5
m) as the wet running meter with EC motor, and with automatic adjustment of the
6 x 500 W halogen spotlights for simulation of the irradiated solar power
Safety devices with diaphragm expansion vessel and 6-bar pressure control valve
2 ball valves, with integrated thermometer and gravity braking system in the collector
Flowmeter and "FlowCheck" for controlling the flow (5 to 40 L/min)
Fittings for filling and flushing
Training stand 4: Hydraulic switch, plate heat exchanger and buffer storage
This training stand is used for adaptation to the hydraulic conditions. The uses
for the hydraulic switch, the plate heat exchanger or the heat exchanger integrated
in the storage system are diverse.
Hydraulic switch and plate heat exchanger are interchangeable using an exchangeable
disc (the component not being used is fastened to the rear of the stand)
Hydraulic switch: Stainless steel vessel (volume approx. 1 litre) Primary circuit
and secondary circuit are at the same pressure but are not hydraulically coupled
Plate heat exchanger: 16 exchange plates, exchanger performance 17 kW at 70/50°C
primary and 35/45°C secondary
Enamel reservoir for holding 160 litres of water, with integrated straight-tube
Training stand 5: Heat pump
This training stand constitutes the central element of the teaching system. Besides
the heat pump, the stand contains all the power supply points for the other training
stands. With the brine and heating circuit connection, the circulation pumps and
the safety devices are already installed for the professional operation of a heat
Conventional heat pump with evaporator, scroll compressor, liquefier and expansion
valve in line with state-ofthe-art technology.
Permanently fitted cold circuit (not accessible for experimental interventions),
Manometer for sensing and measuring physical events in the cold circuit.
Digital thermometers for measuring the temperatures in the cold circuit downstream
of the evaporator, air compressor, liquefier and expansion valve.
Low and high-pressure control devices, energy measuring device, highefficiency
circulation pumps and other components.
Power supply, measuring and switching unit with RCT, main fuses, energy measuring
device, control-circuit fuse and contactor relay.
Training stand 6: hybrid collector
This training stand adds a further key technology - photovoltaics - to the teaching
system. This also allows a solid fundamental knowledge of hybrid collectors to be
accumulated and built upon. Thus, heat pump system concepts can be developed and
tested using photovoltaics and hybrid collectors. The process of system integration
as a solution with many benefits is therefore convincingly practical.
To understand the function of a hybrid collector on the basis of experiments and
To plan heat pump systems with hybrid collectors as an energy source for the heat
To understand the effect of the temperature profile on the thermal collector and
To record and analyse measured values
To plan and execute an emergency power system for a circulation pump with regulator
Sensible use of PV electricity in off-grid systems or in the emergency power system
To understand the physical process of a hybrid collector in thermal energy extraction
through the brine circuit of a heat pump
To understand the process of water extraction through condensation at the hybrid