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Products  |  Thermal Engineering and HVAC  |  Refrigeration and Air Conditioning Technology  |  ET 165
ET 165 Refrigeration System with Open Compressor Show data sheet (pdf file) Print page
Technical Description

  ET 165 enables basic experiments in the field of refrigeration. The trainer includes a closed refrigeration circuit with open compressor, a condenser with fan, a thermostatic expansion valve and an evaporator in a refrigeration chamber with transparent door. A fan in the refrigeration chamber ensures an even temperature distribution. A cooling load is simulated by an adjustable heater in the refrigeration chamber. The drive unit HM 365 drives the compressor via a V-belt. The compressor speed is set at the HM 365. The circuit is equipped with a combined pressure switch for the delivery and intake side of the compressor.
  All relevant measured values are recorded by sensors. Digital displays indicate the measured values. The simultaneous transmission of the measured values to a data recording software enables convenient analysis and the representation of the process in the log p-h diagram. The software also displays the important characteristics variables of the process, such as the refrigeration capacity and the coefficient of performance.
  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

- fundamentals of refrigeration
- design and components of a refrigeration system
  * open compressor with drive
  * condenser
  * evaporator
  * thermostatic expansion valve
  * pressure switch
- determination of important characteristic variables
  * coefficient of performance
  * compressor capacity
  * refrigeration capacity
  * compression ratio
  * volumetric efficiency
- representation of the thermodynamic cycle in the

  log p-h diagram
- determination of the compressor efficiency
- effect of the compressor flow rate on the

  refrigeration circuit


* Capacity measurement at the open compressor with

  variable speed1
* Refrigeration chamber with transparent door and

  adjustable cooling load1
* Part of equipment series for the investigation of

  engines and machines

Available accessories
HM 365 -- Universal Drive and Brake Unit
Alternative products
ET 426 -- Capacity Control in Refrigeration Systems
ET 428 -- Energy Efficiency in Refrigeration Systems
ET 165 Compression Refrigeration System with HM 365
[1] investigation of a refrigeration circuit with speed-controlled compressor
[2] refrigeration circuit with open compressor, condenser, thermostatic expansion valve and evaporator in refrigeration chamber
[3] cooling load in the refrigeration chamber adjustable via heater
[4] drive and speed adjustment of the open compressor via HM 365
[5] condenser and evaporator with fan
[6] digital displays for pressure, temperature, flow rate, power and speed
[7] GUNT software for data acquisition via USB under Windows Vista or Windows 7
[8] refrigerant R134a, CFC-free
Technical Data

Open compressor
- refrigeration capacity: approx. 845W (at speed:

  975min-1 and -10/40C)
- speed: 500...1.000min-1
Condenser with fan transfer area: 2,5m
- capacity: approx. 1.935W at 25C air temperature

  (ambient) / Δt=15C 
- transfer area: 3,62m
- capacity: 460W at 3C air temperature

  (chamber) / Δt=13C
Heater power: 500W
Measuring ranges
- temperature: 4x -5...105C, 1x -50...250C
- pressure: 2x -1...15bar
- speed: 1x 0...1.000min-1
- flow rate R134a: 1x 2...15g/s
- power: 1x 0...500W

Dimensions and Weight
LxWxH: 1.470x800x1.850mm
Weight: approx. 185kg
Required for Operation
230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase
Scope of Delivery

1 trainer

1 v-belt

1 GUNT software CD + USB cable

1 set of instructional material

Order Details

061.16500  ET 165  Refrigeration System with

                                Open Compressor

© 2005 G.U.N.T. Gerätebau GmbH