Home           Products           Company           Contact us     
Theory of Machines and Properties of Materials
Mechatronics
Thermodynamics, Heating and Sanitary Systems
> Fundamentals of Thermodynamics
> Applied Thermodynamics
> Power Engines and Machines
> Internal Combustion Engines
> Refrigeration and Air Conditioning
> Heating and Ventilation
> Sanitary Systems
Fluid Mechanics and Hydrology
Process Control and Process Engineering
Overviews
Products  |  Thermodynamics, Heating and Sanitary Systems  |  Refrigeration and Air Conditioning  |  ET 921
ET 921 Domestic Air Conditioning Simulator Show data sheet (pdf file) Print page
Technical Description
The ET 921 simulates the typical cycle of an air conditioning system and demonstrates thermostatic control of the temperature. The front panel shows 3 different types of domestic air conditioning system (portable and fixed split design; compact design). As well as a drawing of the system and a system diagram, there are 2 potentiometers for input of the external and target room temperatures of each system. The set temperature values are transferred to the simulation software via USB cable. State changes of the potentiometers immediately influence the simulation, allowing reactions in the cycle to be observed. As well as model selection and fault management, the software provides 4 further views: system with current room temperatures and heat flows; system diagram with current room temperatures, temperatures and pressures in the refrigeration circuit and settings for the pressure switch in the 2 split systems; p-h state diagram; measured values over time.  
Learning Objectives / Experiments
- Fundamental understanding of a refrigeration circuit
- Introduction to various air conditioning systems
- Basic functioning of temperature control with
  adjustable hysteresis
- Online presentation of states in p-h state diagram
- Software functions:
   + fault simulation
   + setting of pressure switch and thermostat 
   + online calculation of all temperatures, pressures
      and powers in simulated system
Features
* Simulation of 3 different domestic air conditioning
  systems1
* Simulation of faults1
* Temperature control using thermostat
Alternative products
ET 340 -- HVAC Simulator
ET 508 -- Two-Stage Air Compressor Simulator
ET 795 -- Two-Shaft Gas Turbine Simulator
ET 915 -- Base Condensing Unit
Specification

[1] Benchtop unit for investigation of simulated domestic air conditioning systems
[2] l x w x h: 610x300x430mm, 20kg
[3] System simulations: fixed split design, portable split design, compact system
[4] 6 potentiometers for temperature adjustment
[5] LabVIEW software: model selection, fault management and 4 different views per system (system, system diagram, p-h state diagram, measured values over time)
[6] Fault management: up to 5 faults can be resolved simultaneously, total of 11 faults
[7] Front panel with system diagram for all systems
[8] Power supply via PC

 
Technical Data

USB box:
16 analogue inputs, 1 analogue output
4 digital inputs, 4 digital outputs

System requirements for LabVIEW software:
- 1 USB port

- Windows XP

 
Dimensions and Weight
l x w x h : 610 x 300 x 430 mm
Weight : approx. 20 kg
Connections
Power supply via PC
Scope of Delivery

1 simulator

1 software CD

1 USB cable

1 instruction manual
Order Details

061.92100  ET 921  Domestic Air Conditioning 

                     Simulator
Print
© 2005 G.U.N.T. Gerätebau GmbH