DC Bus Ac System

DC Bus Acoustic System

As the “thermal management heart” of new energy buses, the DC Bus Acoustic System, driven directly by the vehicle’s high-voltage battery, eliminates reliance on the engine and has become a core system for improving the range, comfort, and reliability of electric buses.

According to information from the 2024 “China Vehicle Thermal Management Technology Annual Conference”—a conference hailed as a trendsetter in the industry—Busclima’s technological innovation is driving the field towards rapid development towards high-efficiency integration and intelligent control.

DC Bus Ac System

The performance of the DC Bus Acoustic System is defined by a series of key parameters that directly affect the vehicle’s operational efficiency and passenger experience.

Cooling and Heating Capacity

The system needs to possess powerful cooling/heating capacity (typically 10-40kW) to cope with the challenges of full load and large space.

Advanced systems achieve dual cooling and heating functions through four-way reversing valves and PTC electric heating elements, ensuring comfort in both winter and summer.

Model		AirSuper250	AirSuper320	AirSuper360	AirSuper400
Cooling Capacity		25KW	32KW	36KW	42KW
Heating Capacity		Optional	Optional	Optional	Optional
Fresh Air		1000m³/h	1000m³/h	1500m³/h	1750m³/h
Refrigerant		R134a	R134a/7.5KG	R134a/10.5KG	R134a/13KG
Compressor	Model	Valeo TM31	Bock FK40/560K	Bock FKX40/560K	BOCK 655K
	Displacement	313CC	554CC	554CC	650CC
	Weight	15.5KG	33KG	33KG	31KG
	Oil Type	ZXL 100PG	BSE55	BSE55	FUCHS Reniso Triton SE55
Evaporator	Type	Hydrophilic aluminum foil with internal ridge copper tube	Hydrophilic aluminum foil with internal ridge copper tube	Hydrophilic aluminum foil with internal ridge copper tube	Hydrophilic aluminum foil with internal ridge copper tube
	Air Flow	4000m³/h	4000m³/h	6000m³/h	7000m³/h
	Blower Type	4-speed centrifugal type	4-speed centrifugal type	4-speed centrifugal type	4-speed centrifugal type
	No. of Blower	4 pcs	4 pcs	6 pcs	8 pcs
	Current	32A	36A	48A	48A
Condenser	Type	Aluminum foil with internal ridge copper tube	Aluminum foil with internal ridge copper tube	Aluminum foil with internal ridge copper tube	Aluminum foil with internal ridge copper tube
	Air Flow	5700m³/h	5700m³/h	7600m³/h	9500m³/h
	Fan Type	Axial type	Axial type	Axial type	Axial type
	No. of Fan	3 pcs	3 pcs	4 pcs	5 pcs
	Current	24A	27A	32A	40A
Total Current		< 65A	< 75A	< 85A	< 95A
Weight		170 KG	170 KG	215 KG	263 KG
Dimension (LWH) mm		30381820189	33351820187	38041902205	44351902210
Application		6-8 Meter City Bus & Coach	8-10 Meter City Bus & Coach	9-11 Meter City Bus & Coach	11-13 Meter City Bus & Coach

Energy Efficiency and Range

Cooling efficiency ratio (COP) is a core indicator.

The system, employing a DC inverter compressor and intelligent stepless frequency conversion control, achieves a cooling energy efficiency ratio (CER) of over 3.4, saving more than 20% energy compared to traditional solutions and significantly extending the bus’s driving range.

Safety and Reliability

To address complex operating conditions such as vehicle vibration and extreme temperatures, the system incorporates multiple electrical protections, including undervoltage, overcurrent, and overload protection.

Stable operation within a wide temperature range of -40℃ to 50℃, while meeting stringent electromagnetic compatibility requirements, has become a standard for high-end products.

Noise Control
Quiet cabin operation is crucial for passenger comfort.

The dual-cylinder compressor balances piston forces, reducing vibration and noise by up to 30%, creating a quiet environment for urban public transportation and other scenarios.

The DC Bus Ac System has evolved from a basic comfort feature to a key intelligent system determining the market acceptance of electric buses.

Its development trajectory clearly points to higher energy efficiency, deeper integration, more intelligent control, and greater environmental friendliness, continuously driving a green revolution in the public transportation sector.