Bus Air Conditioning Unit Basic and Installation - TKT HVAC

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This article will introduce in detail some information about bus air conditioning unit. Include the following contents respectively:
1 What type of AC is used in buses?
2 Installation steps of bus air conditioning unit
3 What is bus air conditioning unit?
4 How does the HVAC system work on a bus?
5 What does an AC bus do?

What type of AC is used in buses?

I'll start with the bus model. First of all, the most common diesel bus. It usually uses an engine-driven bus air conditioning unit. This type of air conditioning unit has a high cooling capacity and is cost-effective. The disadvantage is that it cannot use when parked. If you need to use it when parking, we recommend choosing Sub Engine Bus Air Conditioning (but relatively expensive).

Let me add another special case - mini bus. This kind of bus can choose 1 or 2 12v/24v mini bus air conditioning unit. This solution has a relatively low cooling capacity and is suitable for areas and countries that are not very hot.

Followed by the new electric buses. This kind of bus uses high-voltage power battery as energy source. They have high battery capacity and can be used for electric bus air conditioning. Whether it is cooling capacity or parking use, it can easily meet your needs.

TKT HVAC busthermo is one of the top 3 bus air conditioner manufacturers in China. Founded in , it has rich OEM customization experience and production experience. We have a variety of solutions that are sure to solve your coach cooling problems. Welcome to leave a message to communicate.

Installation steps of bus air conditioning unit

Air conditioning unit part

1. Opening: Check that the bus roof opening should be consistent with the opening size of the air conditioner.
2. Cleaning: Clean the car roof to ensure it is clean and tidy.
3. Sealing: Apply sealing insulation sponge around the roof air outlet and return air outlet, and ensure sealing.
4. Fixing: Find the corresponding positions of all bolts and shock-absorbing rubber pads, and use sealant to fix them.
5. Installation: Hoist the bus air conditioning unit. After finding the installation location, use the corresponding mounting holes and bolts to secure it firmly. Then apply sealant again to strengthen the fixation.
6. Interior: Check the interior of the bus to see if the sealing insulation sponges on the air outlet and return air outlet are compacted and sealed. Then apply sealant evenly, with a thickness of not less than 3MM. To strengthen fixation and sealing.
7. Cleaning: After all work is completed, clean the inside of the bus air conditioning unit and install the top cover correctly on the roof unit.

Pipe installation (drainage pipes, refrigeration system pipes)

1. The evaporation chamber of the air conditioner has drainage holes. After connecting the drainage hose, fix the pipe in the air ducts on both sides of the roof and lead it to the outside of the car. During the installation process, attention should be paid to ensuring that the water pipes are not compressed and prevented from coming into contact with sharp objects.

2. To install the refrigeration pipeline, first slowly loosen the blockage at the joint between the evaporator and the condenser to allow the precharged dry nitrogen to overflow. Then connect the refrigeration pipeline to the evaporator and condenser correspondingly. Apply refrigeration oil to the sealing ring, spreading it evenly to ensure good contact.

Compressor installation

Fix the compressor on the bus chassis, tighten the bolts, adjust the shock absorber spring, and fix the compressor clutch on the compressor bracket. Then connect the drive belt of the compressor to the bus engine, making sure it is tight. Other pipeline parts are fixed with clamps and must be kept away from heat sources and sharp objects to ensure heat dissipation and longevity as much as possible.

Final inspection

1. Pour in nitrogen to maintain pressure to check the tightness of the refrigeration system, and finally fill it with refrigerant.
2. Check all connections to make sure they are installed correctly and tight.
3. Start the air conditioning system and check its operation. Listen carefully for abnormal noise and check for abnormal vibration.
4. After running the system for a while, check the pressure and temperature again to make sure they are within the normal range.
5. Finally, perform a thorough cleaning and inspection to ensure that all work has been completed and no parts have been missed.

What is bus air conditioning unit?

Bus air conditioning unit is the air conditioner installed on the bus. Its principle is similar to that of home air conditioners, but bus air conditioning also need to consider the driving status and bumps of the vehicle. Therefore, it needs to adopt more stable and reliable refrigeration technology and materials. It is very important for passenger comfort experience.

Bus air conditioner is mainly composed of compressor, condenser, evaporator, piping system and electronic control system. Usually the condenser and evaporator are installed on the roof of the bus. The liquid reservoir, dry filter and expansion valve are installed inside the evaporator. The air conditioner controller is installed on the dashboard.

Bus air conditioning unit condenser:

The condenser is a heat exchange device that condenses the high-pressure and high-temperature refrigerant gas discharged from the compressor into a liquid state after releasing heat through it.

Specifically, in the condenser it is the refrigerant that transfers heat to the surrounding ambient air. The refrigerant flows in the tube. During the heat release process, the refrigerant gas gradually condenses into a refrigerant liquid, and the external ambient air absorbs heat and becomes hot. The air blown by the condensing fan dissipates heat efficiently.

Bus air conditioning unit evaporator:

The evaporator is a device that absorbs heat and vaporizes the refrigerant that has been throttled by the expansion valve to achieve the cooling effect.

Specifically, when the air passes through the evaporator core, heat is taken away by the refrigerant in the core, thereby cooling the air. In order to prevent water droplets from condensing on the evaporator core and being carried into the cabin by the air flow, the outer surface of the evaporator core is coated with a hydrophilic film.

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How does the HVAC system work on a bus?

The work of the bus air conditioning unit is divided into four processes.

A. Compression process: It absorbs heat in the evaporator and turns it into a low-temperature and low-pressure gaseous refrigerant. After being sucked and compressed by the compressor, it turns into a high-temperature and high-pressure gaseous refrigerant and is discharged into the condenser.

B. Condensation process: After the high-temperature and high-pressure gaseous refrigerant enters the condenser, it dissipates heat to the surrounding ambient air through the condenser radiator under the action of the condenser fan, and at the same time condenses into high-temperature and high-pressure liquid refrigerant.

C. Throttling process: After the high-temperature and high-pressure liquid refrigerant passes through the liquid receiver and filter dryer, it is throttled to cool down and depressurize through the expansion valve, and becomes a mixture of low-temperature and low-pressure liquid and gaseous refrigerant and enters the evaporator.

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D. Evaporation process: The refrigerant is throttled by the expansion valve and becomes a mixture of low-temperature and low-pressure liquid and gaseous state. It vaporizes in the evaporator. Under the action of the evaporator fan, it absorbs the heat of the air in the cabin to cool the air in the cabin, and at the same time precipitates condensation. water. After absorbing heat, the refrigerant evaporates into low-temperature and low-pressure gaseous refrigerant, which is sucked into the compressor and then compressed to complete a refrigeration cycle.

The compressor keeps running, the above-mentioned refrigeration process circulates continuously, and the heat in the bus is continuously taken away by the refrigerant in the evaporator, thereby completing the cooling of the bus.

What does an AC bus do?

Mainly reflected in the following aspects:

1. Improve the air quality in the bus: The air conditioner can circulate fresh air, discharge the dirty air in the bus, reduce dust, carbon dioxide, bacteria and other harmful substances, and provide passengers with a fresh environment.

2. Improve passenger comfort: In hot summer, air conditioning can control the temperature inside the bus at a temperature that is comfortable for the human body, thereby improving the passenger riding experience.

3. Energy saving and environmental protection: With the development of new energy buses, the design of air conditioning systems is more energy-saving and environmentally friendly, which can effectively reduce energy consumption and reduce the impact on the environment.

TKT Bus Air Conditioner

TKT was established in . TKT HVAC has advanced cooling technology and manufacturing processes to further improve refrigeration and heat transfer efficiency. If you care about energy saving and environmental protection, we are your best choice.

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There are multiple ways to cool your Arvada, CO home, but few are as efficient as a ductless mini-split. Although they&#;ve been around since , ductless mini-split ACs are fast-gaining new interest due to their low operating costs, flexibility, and ease of installation. However, like all HVAC equipment, these units come with both benefits and drawbacks. To help you make an informed selection, the following are several pros and cons of having a ductless air conditioner installed.

Mini-Split AC Systems Limit Energy Waste

Ductless air conditioners provide customized climate control. While central cooling systems cool entire homes uniformly, air delivery from a mini-split is divided across multiple indoor zones.

Each zone gets its own thermostat and air handler, and the climate in each zone is controlled independently of the others. This allows residents to only get cooled air when they want it. It also eliminates the need to cool spaces that no one in the building is using.

Mini-split air conditioners additionally prevent the considerable energy loss that commonly occurs in ducted systems. Even relatively new ducting can be responsible for energy losses of up to 25%. Without the ductwork, problems like air loss and heat gains won&#;t be an issue.

Ductless Mini-Splits Cost More Than Central Air Conditioners

At initial purchase, you&#;ll pay a lot more for a ductless mini-split system than you would for a comparable central air conditioner. However, this isn&#;t accounting for the costs of installation. In homes that lack central HVAC ductwork, the cost of retrofitting buildings with air ducts can make a central air conditioner&#;s installation far more expensive.

Mini-Split Installation Is Minimally Invasive

Compared to ductwork retrofitting projects, ductless mini-split AC installation is minimally invasive. Each room or zone that gets its own air handler will have a small hole drilled in its exterior wall. The average diameter of these holes is about three inches.

HVAC installers use these openings to pass wires and copper refrigerant lines through and connect them to indoor air handlers. Air handlers are mounted high up on walls or on ceilings to minimize their aesthetic impact. Moreover, they&#;re available in a diverse range of colors, and they have slim profiles. The right options can seamlessly coordinate with existing decor.

Switching to a Ductless Mini-Split Could Improve Your Indoor Air Quality

Even with routine maintenance and regular air filter changes, ducted cooling systems can introduce a lot of airborne debris into your living space. This is increasingly true as HVAC ductwork ages and develops cracks, loose connections, and other air leaks. In comparison, ductless mini-split systems distribute conditioned air right where it&#;s produced. In addition to eliminating heat loss and heat gain during air distribution, their setup also ensures that micro-sized impurities aren&#;t picked up along the way.

You&#;ll Miss Out on Integrated Indoor Air Quality Accessories

Ductless mini-split systems cannot accommodate indoor air quality (IAQ) accessories that are installed directly in HVAC ducting or attached to it. Thus, if you need whole-house dehumidification, whole-house air purification, or other IAQ technologies for supporting resident health, you&#;ll want to have a ducted cooling system installed.

Ductless Mini-Split ACs Can Cool Areas That Aren&#;t Serviced by Central HVAC

You don&#;t have to use a ductless air conditioner for whole-house cooling. These systems can accommodate between one and eight indoor air handlers as needed. If there are areas of your home that aren&#;t properly serviced by your central AC, you can use a mini-split to ventilate these spaces and keep them safe and comfortable. Homeowners with central cooling systems often install ductless ACs to regulate temperature and humidity in attic bedrooms, garden rooms, garages, and finished basements.

Add Value to Your Home With a Ductless Mini-Split

Many savvy buyers are searching for homes with efficient, well-maintained, and relatively new cooling systems. Given their low operating costs, ease of installation, and general appeal, ductless mini-split air conditioners tick all of these boxes and more. If you don&#;t currently have a fixed cooling solution in a home you have on the market, adding ductless AC is a great pre-sale improvement for upping interest in your listing.

We proudly serve homeowners in Arvada, CO and the surrounding communities. We offer heater, air conditioner, and ductless mini-split installation, maintenance, and repairs. We also provide water heaters, indoor air quality services, and gas piping. To find out about our service club memberships or to schedule an appointment, give us a call at Coffman & Company today.

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