How does air conditioning work in a bus?

The Bus Air Conditioning Refrigeration Cycle

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• The Thermostat, located in the interior of the vehicle, calls for cooling.
• Based on a signal from the thermostat, by means of an inter connecting electrical system, the electromagnetic clutch on the compressor engages.
• Once engaged, the compressor then circulates refrigerant through the system through inter connecting hoses.
• Refrigerant, existing as a gas, and containing the heat from the passenger compartment, is pumped by the compressor, under high pressure, into the condenser coil.
• Fans pull cool air through the condenser coil, which contains refrigerant existing as a hot gas.
• The refrigerant undergoes a change-of-state, from a gas to a liquid, through a process called condensation.
• During condensation, the hot gas rejects its heat load to the outside air, which was transferred from the passenger compartment, into the refrigerant, by the evaporator.
• The refrigerant now exists as a cool liquid, which passes through the filter drier, which removing moisture and impurities, and then the sight glass, which enables visual inspection of the refrigerant.
• The cool liquid is then pumped to the evaporator where an expansion valve meters the refrigerant into the evaporator coil.
• Fans pull passenger compartment air through a filter, which removes particulate matter, then passes the cleaned air through the evaporator coil.
• The refrigerant undergoes a change of pressure from high to low, and a corresponding change-of-state from a liquid to a gas, through a process called evaporation.
• During evaporation, the heat contained in the air in the passenger compartment is absorbed by the gaseous refrigerant.
• A warm air passes through the evaporator coil, moisture condenses, and is collected and drained to the exterior of the vehicle,
• The hot gas is then suctioned back to the compressor and pumped to the condenser.

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Bus air conditioner catalogue

Bus Air Conditioning System Basic Structure 

The bus air conditioning system mainly consists of the condenser, evaporator, compressor, magnetic clutch, alternator, fresh air device, blower, fan, retnrn air grille, control panel, pipeline system and electric-controlled system. 

 

The reservoir, filter direr, sight glass, cut-off valve, expansion valve, and fresh air device are located in the interior of the evaporator.

 

The compressor is mounted on the side of the engine, and the climate control panel of the

bus air conditioning system

has its own starting system, which is located beside of the instrument board.

 

The rooftop mounted evaporator assembly of

bus air conditioning

are adopting the SMC housing to protect its components and remain a good insulation performance (Most bus air conditioning system&#;s evaporator use the traditional FRP housing, but

Guchen Industry

adopts the SMC and LFT housing materials which is lighter, higher strength and more environmental).

 

The condenser is mainly divided into new design Multi-flow-condenser (micro channel condenser) and traditional copper and fin condenser, the condenser fan blows the air through the condenser coil, in order to aide the heat dissipation better. 

 

Working Principle of Bus Air Conditioning System

&#; When you press the ON/OFF button on control panel of bus air conditioning in the driver&#;s cabin, relying on an inter connecting electrical system, the compressor is driven by the

electromagnetic clutch

via the belt which connected to driven pulley of engine, then the compressor circulates refrigerant through the interal connecting hoses system.

 

 

&#; Refrigerant, as gas, we use the R134a refrigerant in our bus a/c system, together with the heat from the passenger compartment, which is pumped by the compressor to the high-temperature high-pressure gas, and entering the condenser coil via the high-pressure air-conditioning pipeline.

 

SONGZ Product Page

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&#; Since the temperature of refrigerant entering condenser is higher than outside temperature,  condenser fans cooling the condenser coil, and taking away a lot of heat energy which contains refrigerant existing as a hot gas.

 

&#; The refrigerant undergoes the liquefied exothermic reaction, from high-temperature high pressure gas to medium-temperature, high-pressure liquid. 

 

&#; Now, the refrigerant exists as a cool liquid, passes the reservoir, cut-off valve (will decrease the waste of refrigerant while repair and maintain the bus air conditioning sysem, and bring the convenience for aftersale engineers.), and entires filter drier which removing moisture and foreign materials, containing the filter, desiccant. Then the filtered refrigerant enters the sight glass, a device which can visual inspection of the refrigerant like water.

 

&#; Then cooled liquid refrigerant flows into the evaporator through expansion valve, which controls the volume of refrigerant into the evaporator coil and decrease the pressure of refrigerant

 

&#; Evaporator absorb the hot air energy form passenger compartment through a return air grille device which includes an fresh air system which removes particulate matter without influencing cooling effect, then the

evaporator blower

blows the cleaned and cooled air into the passenger compartment through the evaporator coil

 

&#; The refrigerant under a change-of-state from a liquid to a gas, and a corresponding change of pressure from high to low, which called evaporation.

 

&#; During evaporation, due to its throttling effect, the cool liquid through the expansion valve becomes gas, and the gaseous refrigerant absorbs a lot of heat energy, containing the passenger compartment hot air, so as to achieve the purpose of the cooing.

 

&#; Warming air passing the evaporator coil, due to cooling effect, moisture condensation, then it is collected and discharged to the outside of the bus.

 

&#; The hot gas in passenger compartment is then suctioned by the compressor, where it is compressed and refrigeration cycle repeats.

 

A/C components for buses

Keywords: Bus HVAC working principle, bus a/c operating principle, how does bus ac work, bus air conditioning, bus air conditioning repair, bus climate control, bus thermostat, rooftop mounted bus AC

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