TWK - Test- und Weiterbildungszentrum Wärmepumpen und Kältetechnik GmbH

Capacity testing facilities for components


Test chamber for cooling and a/c units and heat pumps

Possible researches:

  • air conditioning unit operation at environmental temperatures up to 60 °C
  • heat pump operation down to -20 °C
  • air conditioning of rail vehicles and buses
  • performance analysis in complete systems
  • cooling and dehumidification capacity
  • fresh and recirculating air can be conditioned separately
  • solar radiation simulation
  • dynamic measurements
  • energy efficiency
  • heating capacity





Test bench for full automotive a/c systems

Possible researches:

  • measuring of full systems or single components of automotive a/c systems
  • measuring of cooling and heating capacity
  • in-frame measuring of evaporator and condenser
  • measuring of gas coolers
  • a/c and heat pump running, components for cycle reversion
  • performance balancing on the refrigerant and air side
  • electrical powered and belt-driven compressors
  • refrigerants: R134a, R1234yf, R744, …
  • continuous oil concentration measurements, oil retention
  • thermographic analysis of temperature distribution





Long-term test bench for compressors and systems

Possible researches:

  • long-term durability measuring of compressors according to VDA or customer specific guidelines
  • construction in a conditionable soundproof cabin
  • environmental temperature of compressor controllable
  • performance analysis of electrical powered and belt-driven compressors
  • flexible choice of refrigerant
  • performance balancing on the refrigerant and air side





Test bench for components of automotive a/c systems

Possible researches:

  • performance analysis of battery cooling units
  • valve examination (TXV, EXV)
  • performance analysis of internal heat exchangers (IHX)
  • measurement of pressure loss
  • refrigerant: R134a, R1234yf, …
  • adjustable oil concentration





Test benches for automotive refrigerant compressors

Possible researches:

  • belt-driven and electrical powered automotive compressors
  • evaluation of performance map
  • measurement of cooling capacity via calorimeters and refrigeration cycle
  • refrigerants: R134a, R1234yf, R513A, R404A, R410A, …
  • adjustable oil concentration
  • long-term durability measuring of compressors according to VDA or customer specific guidelines
  • adjustable environment of compressor




Test bench for components suitable for R744 (CO2)

Possible researches:

  • analysis of IHX, accumulators and combination of both
  • transmission capacity and degree of exchange of IHX
  • R744-chillers
  • plateau of filling amount
  • oil recirculation
  • separation efficiency
  • pressure loss





Calibration of oil flow measuring methods

Possible researches:

  • calibration of sensors for continuous oil flow measuring
  • sensors: sound velocity, density, refractive index
  • refrigerant: R134a, R1234yf, R410A, R744, R513A, …
  • oil varieties: PAG, POE, PAO
  • miscibility gap





Custom test benches

Possible researches:

  • pressure change examination
  • long-term durability test of pumps
  • validation of valves
  • thermal simulation test bench for control development
  • component examination under high and low environmental temperatures
  • performance analysis of battery cooling units and compact a/c units
  • pressure loss measurement of piping components




Further information