Air Conditioning and Heating System for Škoda 29T Ostrava and 30T Bratislava Trams
The air conditioning and heating system for Škoda 29T and 30T trams is designed for cooling, ventilation, heating and conditioning of the air supplied to the passenger compartment and the driver's cabin in the tram. This project reflects our experience with the production and operation of the first generation of Poll air conditioning systems in 28T trams. This is one of the things that made it possible to increase the heating and cooling capacity while maintaining the same weight.
The system consists of three main devices:
- KLMT29S passenger compartment air conditioning units
- KLMT29K air conditioning units for the driver’s cabin
- four types of KVA-03 heating units
The interior heating units have been upgraded to a higher level, as each unit contains a contactless switch and its own control unit with a CAN line, which enables improved control of thermal comfort in the vehicle. The air conditioning unit 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 makes it possible to minimise dimensions, saving space on the vehicle’s roof and resulting in better weight distribution.
Characteristics
- Control via automotive Ethernet
- Compatible with TST (Tunning and Service Tool)
- Integrated frequency converters
- Internal CAN line for heating units
- Continuous control of fans and compressor speed
- Contactless heating system control
- Power supply from overhead line
- Advanced diagnostic possibilities, event and operational data log
Technical parameters of the KLMT29S 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 399 kg
- Maximum air supply 3,000 m3/h.
- Operating temperature range -40 °C to + 45 °C
- Communication interface Ethernet, CAN
Technical parameters of the KLMT29K unit
- Rated cooling capacity of the unit 4 kW
- Rated heat output 5 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 550 m3/h.
- Operating temperature range -40 °C to + 45 °C
- Communication interface CAN, Ethernet
ABOUT THE PROJECT:
- Customer: ŠKODA TRANSPORTATION a.s.
- Year of implementation 2014-2015
- Number of vehicles: 60
- Place of operation: Slovakia, Bratislava
