This is the second generation of POLL air conditioning units with a completely new design for the demanding climate of Eskisehir, Turkey, which enables increasing the heating and cooling capacity.  The design and production are entirely in the hands of POLL.  The new concept of heating the driver’s cabin with an additional calorifier ensures exceptional temperature comfort.  The control of the air-conditioning units has also evolved.

The system consists of four main devices:

• KLM-T2515.ESK01 passenger compartment air conditioning units
• KLM-T0507.ESK01 air conditioning units for the driver’s cabin
• four types of KVA-03 heating units
• KVK-03 cabin heating unit (calorifer) of the

The interior heating units contain a contactless switch and their own control unit with a CAN line, which has improved control of thermal comfort in the vehicle.  The air conditioning units in the passenger compartment and the driver’s cabin are equipped with integrated compact power converters with galvanic isolation and inverters.  This allows them to be powered directly from the 600 V or 750 V DC traction network.  The cooling of the converters is active, using the air flowing through the air conditioning unit.  This solution allows smaller dimensions, saving space on the vehicle’s roof and resulting in better weight distribution. The KLM-T0507 driver’s cabin air conditioning unit is also used in the Škoda 35T tram in Chemnitz, Germany.

Characteristics

• Control via automotive Ethernet
• Internal CAN line for controlling heating units from the passenger compartment unit KLM-T2515.EKS01
• Compatible with TST (Tunning and Service Tool)
• Advanced diagnostic possibilities, event and operational data log
• Integrated frequency converters, first generation resonant SiC converter
• Continuous control of fans and compressor speed
• Contactless heating system control
• Power supply from overhead line

Technical parameters of the KLM-T2515.ESK01 unit

• Rated cooling capacity of the unit                              25 kW
• Rated heat output                                                          15 kW
• Rated power supply voltage                                         750 V DC
• Operating range of supply voltage                              500 V – 1000 V DC
• Rated control voltage                                                    24V DC
• Refrigerant in the compressor circuit                        R134a
• Weight of cooling circuit components                       420 kg
• Maximum air supply                                                     3500 m3/h.
• Operating temperature range                                      -40 °C to + 45 °C
• Communication interface                                             Ethernet, CAN

Technical parameters of the KLM-T0507.ESK01 unit

• Rated cooling capacity of the unit                              5 kW
• Rated heat output                                                          7 kW
• Rated power supply voltage                                         750 V DC
• Operating range of supply voltage                              500 V – 1000 V DC
• Rated control voltage                                                    24V DC
• Refrigerant in the compressor circuit                        R134a
• Weight of cooling circuit components                       150 kg
• Maximum air supply                                                     600 m3/h.
• Operating temperature range                                      -40 °C to + 45 °C
• Communication interface                                             Ethernet, CAN

ABOUT THE PROJECT:

• Customer: ŠKODA TRANSPORTATION a.s.
• Year of implementation 2017-2018
• Number of vehicles: 14
• Place of operation: Eskisehir, Turkey