How Does Bus Air Conditioning System Work?

Bus air conditioner catalogue

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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.

 

&#; 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

Details of Bus Air Conditioner:

A bus air conditioner is a very complex and specialized piece of equipment. It involves a very large number of parts and specialization, so there are many options. If you need to purchase a bus air conditioner, please read this article carefully first. The selection of some parts is very important, please be sure to confirm with the bus air conditioner manufacturers. Next, I will talk about the bus air conditioning system for you in detail.

Bus Air Conditioning System

With competitive price and timely delivery, SONGZ sincerely hope to be your supplier and partner.

What is a bus air conditioning system?

A bus air conditioning system is a specialized air conditioning system installed on a bus. It is an important piece of equipment that provides a comfortable environment for bus drivers and passengers. It has both cooling and heating capabilities. A complete bus air conditioning consists of many specialized components. Its main parts include compressor, electromagnetic clutch, condenser, filter drier, refrigerant and so on.

Bus air conditioning system design is a continuous optimization process.

Why can't buses use car air conditioners?

1, The bus air conditioning is facing a very large number of passengers in the bus, so it is very demanding on the cooling capacity. Ordinary car air conditioning can not meet the requirements.

2, Bus air conditioning system is usually installed on the roof of a moving bus, so it has high requirements for leakage prevention, vibration prevention, and corrosion prevention.

Bus Air Conditioning System Diagram

How does the bus air conditioning system work?

&#; Bus air conditioning system compressor

The compressor is one of the most important parts of the bus air conditioning system. Its function is to compress and transport refrigerant vapor. It is the power device that drives the refrigerant to circulate continuously in the refrigeration system.

There are three main common types, centrifugal compressor, screw compressor, and scroll compressor. Among them, the scroll compressor is now the latest type of compressor. It has a higher compression ratio, higher system efficiency, and has a small size, low noise, and other characteristics. General high-grade bus air conditioning systems are used in this type of compressor.

The world&#;s most famous brands include Germany BOCK, Japan SANYO, Germany BITZER and so on. These brands of compressors in terms of performance and quality are more guaranteed. If you have enough budget, it is recommended to recognize these big brands when picking a bus air conditioner.

Bus air conditioning system compressor

Compressor Function Principle

1, The compressor draws in low-temperature and low-pressure refrigerant and increases its temperature and pressure by compression.

2, The compressor transports the high-temperature and high-pressure refrigerant to the condenser. The refrigerant exchanges heat with the outside air, emitting heat and lowering the temperature of the refrigerant.

3, The cooled refrigerant is transported to the evaporator, where it exchanges heat with the air inside the bus and absorbs heat from the air. The heat in the air is absorbed to achieve the cooling effect.

&#; Electromagnetic clutch for bus air conditioning system

It belongs to the commander in the bus air conditioning. It is responsible for controlling the start and stop of the compressor. Its working principle is the electromagnetic induction phenomenon.

When the air conditioning system needs to work, the air conditioning control module sends out an energizing command, which generates electromagnetic force to make the compressor and engine work together. When the opposite situation occurs, the power is disconnected and the electromagnet will lose its electromagnetic force, thus separating the compressor from the engine.

&#; Bus air conditioning system condenser

The condenser is one of the important components in the air conditioning system. It is responsible for transferring the heat of the refrigerant to the outside air so that the high-temperature and high-pressure gaseous refrigerant is transformed into high-temperature and high-pressure liquid refrigerant.

In simple terms, it mainly accomplishes the heat dissipation process.

Bus air conditioning system condenser

&#; Bus air conditioning system evaporator

The evaporator is another important component in the air conditioning system. Its role is to evaporate the liquid refrigerant in the evaporator through heat exchange with the refrigerant and absorb the heat in the air, thus realizing the cooling and dehumidification inside the bus.

In simple terms, it mainly accomplishes the process of cooling the air inside the bus.

Bus air conditioning system evaporator

&#; Bus air conditioning system filter drier

Filter drier is an indispensable part of the air conditioning system. It plays a vital role in ensuring the normal operation and prolonging the service life of the air conditioning system.

Its function is to remove water and impurities in the refrigerant. It can effectively prevent the blockage of pipes and components and ensure the normal operation of the refrigeration system.

&#; Refrigerants for bus air conditioning system

The liquid and gaseous forms of refrigerant were mentioned repeatedly earlier. It is an important factor in heat exchange. Therefore, its selection has a significant impact on the performance and efficiency of the air conditioning system.

The most common refrigerants for bus air conditioning systems are R-134A, R-407C, and R-22. R-22 is now being phased out. This is mainly because it is more damaging to the environment.

When you purchase a bus air conditioner, please make sure to choose R-134A or R-407C. It is everyone&#;s responsibility to take care of the environment. Protecting the environment is protecting human beings.

Bus Air Conditioning System Summary

To summarize, a bus air conditioning system operates through a number of components working together. The core principle is mainly the heat exchange effect brought about by the compression, condensation, evaporation and expansion of refrigerant.

Bus Air Conditioner Manufacturers: TKT EV Solution

Established in , TKT EV Solution is a leading bus air conditioner manufacturer in China. We are one of the top three suppliers in China in the field of electric bus air conditioning. Our key partners are BYD, TATA Motors, Olectra, Switch Mobility, Marcopolo and others.

If you need to purchase bus air conditioner and bus air conditioner parts. Welcome to leave a message to ask about the bus air conditioner price, the larger the purchase quantity the more favorable price.

For more China roof mounted bus air conditioning system Supplierinformation, please contact us. We will provide professional answers.