The Ultimate Guide to Choosing bus air conditioning system
Get the Right Air Conditioning System for Your Bus
All school bus manufacturers offer air conditioning options. Some install systems on the assembly line. Others offer systems that are installed by A/C manufacturer-qualified installers or the bus sales dealer, after the bus leaves the assembly line.
For more information, please visit our website.
Related: Is Carrier Selling its School Bus Air Conditioning Business?
Related: Valeo Increases Climate Control Business With Spheros Deal
Related: American Cooling Technology Announces Organization Update
OEM and after-market systems vary, from system installations that tie into existing OEM dashboard HVAC systems, to stand-alone complete air conditioning systems. The components that make up an A/C system are the compressor (mounted on the engine or a separate power source), dash evaporator (driver area), controls (switches, thermostats, electronics), hanging or flush evaporators, and rooftop or skirt mounted condensers.
There are so many different kinds of bus air conditioning systems to choose from, that it can be hard to figure out which one is just right for you.
Manufacturers are continually updating or adding new system configurator links through their dealer networks, so be sure that you pick the most economical and effective cooling system. Always work with your dealer to find the cooling system that is specific to your vehicle&#;s cooling needs.
Don&#;t compare apples to oranges, that is, &#;In-dash, tie-in systems to stand-alone propriety systems.&#; Get the right system for your bus, and be sure to consider the power draw that the A/C system will require, so that it does not impact your vehicle&#;s alternator capacity to maintain its battery charge.
Level the Playing Field
1. Have your system provider reference a performance pull-down test. The best and most important evaluation of a system is to measure the ability of the installed system to cool a bus interior.
2. Require BTU/hour system capacities to be recorded in an industry-standard format, such as the Society of Automotive Engineers (SAE).
The National Congress of School Transportation amended school bus A/C specification recommendations in . The resulting National School Bus Specifications & Procedures document, starting on page 49, paragraph B, recommend that two performance standards be used when specifying school bus air conditioning systems:
&#; Standard Performance &#; The installed air conditioning system should cool the interior of the bus from 100 degrees to 80 degrees Fahrenheit in 30 minutes.
&#; High Performance &#; The installed air conditioning system should cool the interior of the bus from 100 degrees to 70 degrees in 30 minutes.
The American Public Transit Association has specified its requirements:
&#; Capacity and Performance Requirements &#; The air conditioning portion of the HVAC system shall be capable of reducing the passenger compartment temperature from 115 degrees to 95 degrees in less than 20 minutes after engine startup.
&#; Hotter Ambient Conditions &#; The air conditioning portion of the HVAC system shall be capable of reducing the passenger compartment temperature from 110 degrees to 70 degrees, plus or minus 3 degrees, in less than 30 minutes after system engagement for 30-, 35- and 40-foot buses.
BTU Capacity Considerations
&#; Gross capacity (most typically used) uses the weakest link (lowest capacity) among the evaporator, condenser and compressor to determine overall system capacity.
&#; Net capacity (rarely used and difficult to measure) uses multiple simultaneous equations until the system is balanced.
There is neither a universal BTU (British Thermal Unit) capacity rating method currently being used in the bus air conditioning industry, nor any governing association to police the industry!
BTU is the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. Aside from the technical definition of BTU, bus air conditioning system BTU capacity is dependent on many variables. It requires that specific rating conditions be defined for each system component, since each has its own capacity.
Capacity ratings can change, higher or lower, depending on the rating conditions that are being used. So be aware that system BTU ranking is the lowest of the three-component values: Compressor, condenser and the evaporator rating.
Theoretical BTU/hour system ratings, when using realistic rating conditions at the various vehicle engine/compressor speeds, is a valuable piece of information to assess the application of the system to the vehicle type.
However, the best way to measure A/C system performance is to install an air conditioning system in the vehicle, operate the vehicle into the above-mentioned environment, and perform a standard or high-performance, pull-down test. This will then tell you that the air conditioning system you ordered to do the job is the one you got.
Editor&#;s Note: Reprinted from the March Issue of School Transportation News
________________________________________________________________________
Bob Pudlewski is the technical editor for School Transportation News magazine and has over 40 years of experience in the school bus industry. He retired as vice president of fleet operations, procurement and maintenance from Laidlaw and is a member of the NTSA Hall of Fame.
If you want to learn more, please visit our website SONGZ.
Guide to Bus Aircon: Key Parts and How It Works
This article introduces in detail the components of bus aircon and the working principles of each part. I try to make the content of the article easy to understand. I believe you will gain a lot from reading this article carefully.
Why is the bus aircon system installed on the roof mounted?
There are three main benefits of the roof mounted bus air conditioning system.
1. Higher space utilization: Installing the air conditioning on the roof can make full use of the external space of the bus. In this way, the bus can carry more passengers, more seats, and a better experience.
2. Better heat dissipation: Installing the air conditioning on the roof of the bus can make full use of air convection. Improve the heat dissipation effect and ensure the efficiency and stability of the air conditioning system.
3. More convenient installation and maintenance: Installing the air conditioning on the roof is easy to lay and fix pipes. In addition, the roof position is also easier to access when performing maintenance or repairs.
What are bus aircon parts?
A complete bus air conditioning system is composed of multiple parts. The bus aircon parts include a compressor, electromagnetic clutch, condenser, liquid reservoir, filter dryer, solenoid valve, expansion valve, evaporator, and fan.
I'll go into detail on each parts individually. The combination of their functions is the working principle of bus aircon.
bus air conditioning system diagram
Parts details - How does a bus aircon system work?
&#; Bus Air Conditioning Compressor
Function: Inhale refrigerant in gaseous form and then compress it. The compression process will increase the temperature and pressure of the refrigerant and turn it into a high-pressure and high-temperature gas form.
Bock traditional compressor SANYO electric compressor&#; Bus AC Electromagnetic Clutch
Function: Receive electrical signals from the bus aircon control system to control the start and stop of the compressor.
&#; Bus Air Conditioning Condenser
Function: Heat exchanges the high-temperature and high-pressure gaseous refrigerant discharged from the compressor with the surrounding environment (usually air or water), and releases heat to the environment. After the heat exchange, the refrigerant cools down and condenses into a liquid state.
&#; Bus AC Reservoir
Function: Store liquid refrigerant. It is used to compensate for changes in refrigerant flow caused by changes in operating conditions in the air conditioning system. Changes in operating conditions such as start-up, storage and cooling phases after thawing.
&#; Bus AC Filter Drier
Function: Remove moisture and impurities from refrigerant. Effectively prevent them from causing damage to various components and extend their service life.
&#; Bus AC Electromagnetic Valve
Function: Control the flow of refrigerant in the air conditioning system. Specifically, it can interrupt or allow refrigerant flow to the evaporator by closing or opening it.
&#; Bus AC Expansion Valve
Function: It automatically adjusts the flow of refrigerant into the evaporator according to the temperature and pressure of the refrigerant at the evaporator outlet. It ensures that the refrigerant in the evaporator can fully evaporate.
&#; Bus Aircon Evaporator
Function: Liquid refrigerant evaporates in the evaporator. The heat required for evaporation comes from the surrounding air. This allows the air to be cooled before entering the bus.
&#; Bus Aircon Fan
Evaporator Fan Function: Inhales the cooled air from the evaporator and blows it into the interior of the bus to provide a cool environment for passengers.
Condenser Fan Function: Heat dissipation. When the gaseous refrigerant passes through the condenser, it emits a large amount of heat. The high-speed rotation of the fan introduces air for cooling. Eventually the refrigerant changes from gas to liquid.
Evaporator Fan Condenser Fan&#; Bus Aircon Refrigerant
Our bus aircon refrigerants use R134A and R407C. They are widely used environmentally friendly refrigerants. They are environmentally friendly, non-toxic and have good cooling effect.
R134A R407CWhat are the different types of bus air conditioning?
Bus air conditioning is mainly divided into two categories. They are electric bus aircon and traditional fuel bus aircon. They are suitable for different aircon bus due to their different power sources.
Electric bus aircon can only be installed on pure electric buses. This type of aircon requires a very high voltage to operate. Usually between 280v-750v. Such voltage requirements can only be met by the power batteries of pure electric buses. But this kind of aircon bus is very environmentally friendly and energy-saving, and the noise is relatively low. The ride experience brought to passengers is very good. New aircon buses like TATA Motors all use aircon like this. Click to browse project cooperation stories.
Traditional fuel bus air conditioner is installed on diesel buses. This type of aircon has wider applicability. There is no need to consider the voltage range. Just choose the appropriate cooling capacity according to the length of the bus. Then connect the bus's engine and bus aircon compressor through a belt. When the aircon needs to be operated, the bus engine can drive the aircon to work. The cooling capacity of this aircon is also very good. The riding experience on fuel aircon bus is also very good now.
Who makes bus air conditioners in China?
Our brand is TKT HVAC. We were established in . It is China's leading bus air conditioner manufacturers. In the field of electric buses, we are the top 3 suppliers in China. Important international partners include TATA Motors, Olectra, Switch Mobility, Marcopolo, etc.
We have experience in OEM cooperation with Fortune 500 companies. We are a reliable bus air conditioner suppliers. If you need to purchase bus aircon system and bus aircon parts. Welcome to leave a message to inquire about bus air conditioner price. The larger the purchase quantity, the more favorable the price.
If you need to see more complete bus air conditioning system pdf. Welcome to contact our sales. They will send beautiful materials to your .
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Facebook: https://www.facebook.com/TKTHVAC/
linkedin: https://www.linkedin.com/company/tkt-hvac
YouTube: https://www.youtube.com/@TKTHVAC
Get the Right Air Conditioning System for Your Bus
All school bus manufacturers offer air conditioning options. Some install systems on the assembly line. Others offer systems that are installed by A/C manufacturer-qualified installers or the bus sales dealer, after the bus leaves the assembly line.
Related: Is Carrier Selling its School Bus Air Conditioning Business?
Related: Valeo Increases Climate Control Business With Spheros Deal
Related: American Cooling Technology Announces Organization Update
OEM and after-market systems vary, from system installations that tie into existing OEM dashboard HVAC systems, to stand-alone complete air conditioning systems. The components that make up an A/C system are the compressor (mounted on the engine or a separate power source), dash evaporator (driver area), controls (switches, thermostats, electronics), hanging or flush evaporators, and rooftop or skirt mounted condensers.
There are so many different kinds of bus air conditioning systems to choose from, that it can be hard to figure out which one is just right for you.
Manufacturers are continually updating or adding new system configurator links through their dealer networks, so be sure that you pick the most economical and effective cooling system. Always work with your dealer to find the cooling system that is specific to your vehicle&#;s cooling needs.
Don&#;t compare apples to oranges, that is, &#;In-dash, tie-in systems to stand-alone propriety systems.&#; Get the right system for your bus, and be sure to consider the power draw that the A/C system will require, so that it does not impact your vehicle&#;s alternator capacity to maintain its battery charge.
Level the Playing Field
1. Have your system provider reference a performance pull-down test. The best and most important evaluation of a system is to measure the ability of the installed system to cool a bus interior.
2. Require BTU/hour system capacities to be recorded in an industry-standard format, such as the Society of Automotive Engineers (SAE).
The National Congress of School Transportation amended school bus A/C specification recommendations in . The resulting National School Bus Specifications & Procedures document, starting on page 49, paragraph B, recommend that two performance standards be used when specifying school bus air conditioning systems:
&#; Standard Performance &#; The installed air conditioning system should cool the interior of the bus from 100 degrees to 80 degrees Fahrenheit in 30 minutes.
&#; High Performance &#; The installed air conditioning system should cool the interior of the bus from 100 degrees to 70 degrees in 30 minutes.
The American Public Transit Association has specified its requirements:
&#; Capacity and Performance Requirements &#; The air conditioning portion of the HVAC system shall be capable of reducing the passenger compartment temperature from 115 degrees to 95 degrees in less than 20 minutes after engine startup.
&#; Hotter Ambient Conditions &#; The air conditioning portion of the HVAC system shall be capable of reducing the passenger compartment temperature from 110 degrees to 70 degrees, plus or minus 3 degrees, in less than 30 minutes after system engagement for 30-, 35- and 40-foot buses.
BTU Capacity Considerations
&#; Gross capacity (most typically used) uses the weakest link (lowest capacity) among the evaporator, condenser and compressor to determine overall system capacity.
&#; Net capacity (rarely used and difficult to measure) uses multiple simultaneous equations until the system is balanced.
There is neither a universal BTU (British Thermal Unit) capacity rating method currently being used in the bus air conditioning industry, nor any governing association to police the industry!
BTU is the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. Aside from the technical definition of BTU, bus air conditioning system BTU capacity is dependent on many variables. It requires that specific rating conditions be defined for each system component, since each has its own capacity.
Capacity ratings can change, higher or lower, depending on the rating conditions that are being used. So be aware that system BTU ranking is the lowest of the three-component values: Compressor, condenser and the evaporator rating.
Theoretical BTU/hour system ratings, when using realistic rating conditions at the various vehicle engine/compressor speeds, is a valuable piece of information to assess the application of the system to the vehicle type.
However, the best way to measure A/C system performance is to install an air conditioning system in the vehicle, operate the vehicle into the above-mentioned environment, and perform a standard or high-performance, pull-down test. This will then tell you that the air conditioning system you ordered to do the job is the one you got.
Editor&#;s Note: Reprinted from the March Issue of School Transportation News
________________________________________________________________________
Bob Pudlewski is the technical editor for School Transportation News magazine and has over 40 years of experience in the school bus industry. He retired as vice president of fleet operations, procurement and maintenance from Laidlaw and is a member of the NTSA Hall of Fame.
Guide to Bus Aircon: Key Parts and How It Works
This article introduces in detail the components of bus aircon and the working principles of each part. I try to make the content of the article easy to understand. I believe you will gain a lot from reading this article carefully.
Why is the bus aircon system installed on the roof mounted?
There are three main benefits of the roof mounted bus air conditioning system.
1. Higher space utilization: Installing the air conditioning on the roof can make full use of the external space of the bus. In this way, the bus can carry more passengers, more seats, and a better experience.
2. Better heat dissipation: Installing the air conditioning on the roof of the bus can make full use of air convection. Improve the heat dissipation effect and ensure the efficiency and stability of the air conditioning system.
3. More convenient installation and maintenance: Installing the air conditioning on the roof is easy to lay and fix pipes. In addition, the roof position is also easier to access when performing maintenance or repairs.
What are bus aircon parts?
A complete bus air conditioning system is composed of multiple parts. The bus aircon parts include a compressor, electromagnetic clutch, condenser, liquid reservoir, filter dryer, solenoid valve, expansion valve, evaporator, and fan.
I'll go into detail on each parts individually. The combination of their functions is the working principle of bus aircon.
bus air conditioning system diagram
Parts details - How does a bus aircon system work?
&#; Bus Air Conditioning Compressor
Function: Inhale refrigerant in gaseous form and then compress it. The compression process will increase the temperature and pressure of the refrigerant and turn it into a high-pressure and high-temperature gas form.
Bock traditional compressor SANYO electric compressor&#; Bus AC Electromagnetic Clutch
Function: Receive electrical signals from the bus aircon control system to control the start and stop of the compressor.
&#; Bus Air Conditioning Condenser
Function: Heat exchanges the high-temperature and high-pressure gaseous refrigerant discharged from the compressor with the surrounding environment (usually air or water), and releases heat to the environment. After the heat exchange, the refrigerant cools down and condenses into a liquid state.
&#; Bus AC Reservoir
Function: Store liquid refrigerant. It is used to compensate for changes in refrigerant flow caused by changes in operating conditions in the air conditioning system. Changes in operating conditions such as start-up, storage and cooling phases after thawing.
&#; Bus AC Filter Drier
Function: Remove moisture and impurities from refrigerant. Effectively prevent them from causing damage to various components and extend their service life.
&#; Bus AC Electromagnetic Valve
Function: Control the flow of refrigerant in the air conditioning system. Specifically, it can interrupt or allow refrigerant flow to the evaporator by closing or opening it.
&#; Bus AC Expansion Valve
Function: It automatically adjusts the flow of refrigerant into the evaporator according to the temperature and pressure of the refrigerant at the evaporator outlet. It ensures that the refrigerant in the evaporator can fully evaporate.
&#; Bus Aircon Evaporator
Function: Liquid refrigerant evaporates in the evaporator. The heat required for evaporation comes from the surrounding air. This allows the air to be cooled before entering the bus.
&#; Bus Aircon Fan
Evaporator Fan Function: Inhales the cooled air from the evaporator and blows it into the interior of the bus to provide a cool environment for passengers.
Condenser Fan Function: Heat dissipation. When the gaseous refrigerant passes through the condenser, it emits a large amount of heat. The high-speed rotation of the fan introduces air for cooling. Eventually the refrigerant changes from gas to liquid.
Evaporator Fan Condenser Fan&#; Bus Aircon Refrigerant
Our bus aircon refrigerants use R134A and R407C. They are widely used environmentally friendly refrigerants. They are environmentally friendly, non-toxic and have good cooling effect.
R134A R407CWhat are the different types of bus air conditioning?
Bus air conditioning is mainly divided into two categories. They are electric bus aircon and traditional fuel bus aircon. They are suitable for different aircon bus due to their different power sources.
Electric bus aircon can only be installed on pure electric buses. This type of aircon requires a very high voltage to operate. Usually between 280v-750v. Such voltage requirements can only be met by the power batteries of pure electric buses. But this kind of aircon bus is very environmentally friendly and energy-saving, and the noise is relatively low. The ride experience brought to passengers is very good. New aircon buses like TATA Motors all use aircon like this. Click to browse project cooperation stories.
Traditional fuel bus air conditioner is installed on diesel buses. This type of aircon has wider applicability. There is no need to consider the voltage range. Just choose the appropriate cooling capacity according to the length of the bus. Then connect the bus's engine and bus aircon compressor through a belt. When the aircon needs to be operated, the bus engine can drive the aircon to work. The cooling capacity of this aircon is also very good. The riding experience on fuel aircon bus is also very good now.
Who makes bus air conditioners in China?
Our brand is TKT HVAC. We were established in . It is China's leading bus air conditioner manufacturers. In the field of electric buses, we are the top 3 suppliers in China. Important international partners include TATA Motors, Olectra, Switch Mobility, Marcopolo, etc.
We have experience in OEM cooperation with Fortune 500 companies. We are a reliable bus air conditioner suppliers. If you need to purchase bus aircon system and bus aircon parts. Welcome to leave a message to inquire about bus air conditioner price. The larger the purchase quantity, the more favorable the price.
If you need to see more complete bus air conditioning system pdf. Welcome to contact our sales. They will send beautiful materials to your .
Facebook: https://www.facebook.com/TKTHVAC/
linkedin: https://www.linkedin.com/company/tkt-hvac
YouTube: https://www.youtube.com/@TKTHVAC
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