When to Use Custom mini bus air conditioning unit Company？

This month I am in the Midland, Texas area.  The daytime temperatures get up to as much as 111° F during the daytime.  For most people that is hot, and it is especially hot in a metal-enclosed bus conversion that is like a tin can.  

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I lived in the Dallas area for ten years back in the 80s, so the heat does not bother me much if the humidity is not too high.  In the Midland and Dallas areas, the humidity is generally pretty low, so I can tolerate the heat. But I am not a fan of high humidity because of my allergies and asthma. 

Being inside a bus can make things much more uncomfortable than in a well-insulated house with 4&#; to 6&#; thick well-insulated walls. In a house, built especially with double-pane windows and a decent air conditioning system, you can keep it very comfortable inside even when the temperatures outside exceed 100° F.  

But in a bus, it can get very hot, very fast, especially on a hot sunny day.  Being inside a bus in the hot summer feels like being in an oven unless you have some very good insulation such as EHP or some other high-end product. 

Over-the-road passenger buses are built with extremely good factory air conditioning.  With a typical bus, you can run the over-the-road air conditioning and keep it a comfortable 72° F throughout the inside of the bus all day and all night even with ambient temperatures above 100° in places like Houston, Miami, or Las Vegas.  You can&#;t beat over-the-road air conditioning in a bus when traveling down the road on a hot summer day.  Of course, most new buses have double-pane tinted windows, and that too makes a huge difference.

Passenger buses generally remain idling when passengers are loading or unloading, or even when just sitting in one place when it is hot outside, mainly to keep the air conditioner running. On the other hand, most converted bus owners, when parked, shut down the engine, and with no engine, there is no over-the-road air conditioning.  Because of that, unfortunately, many people remove the factory-installed air-conditioning to reclaim the space for something else, not realizing that they will never be able to even come close to what they had with factory air.

I had one bus with the factory air conditioning and two buses without it.  I much preferred driving the bus with the factory air conditioning on hot summer days.  In just a few minutes, you can cool down the entire inside of the bus.  One of the drawbacks of the over-the-road air conditioning is that it is a bit noisy outside and it also blows dust on a dirt road all over the place.  

This is not a problem when the bus was in passenger service as they mostly parked on paved surfaces such as at bus terminals or parking lots.  But when converted into a motorhome, many people drive on gravel roads in RV parks or when boondocking stirring up the dust. 

That being said, most people remove the factory air and install either roof air conditioners or lately mini-split units with the head of the unit on a wall inside the bus and the compressor mounted somewhere outside the bus where it can exhaust the heat outside.  

The three roof air units on my current 40&#; Eagle bus, each being 15,000 BTU units, do a very good job at keeping the inside of the bus comfortable even when temperatures soar over 100° F.  The one drawback is that they are a bit noisy unless they are as ducted as many higher-end conversions are.  Mine unfortunately are not ducted, and talking on the with all of them running can be challenging. 

When ducted, the noisy roof air conditioners are muffled by a second lowered ceiling a few inches down from the roof itself where the ducts and wiring are run.  This way, the noise from the blower unit is muffled making the inside of the bus much quieter. 

Roof air units take up the least amount of space and are the easiest to change out if and when they fail, which seldom happens with these units anyway.  They usually last about 15 to 20 years until they must be replaced, at which time, they can be swapped out for a new unit in about an hour.

Basement units are the ultimate and are often found in high-end coaches.  This type of unit keeps the noise in the bay of the bus and out of the living area. They force cool air up through ducts into the living space in the bus and the warm air is passed back down through the floor back to the unit.  This requires one or two large holes in the floor to pass the ductwork through.  

These units are the ultimate as it keeps all of the noise out of the living area.  This type of unit is the most expensive option, and they also take up a lot of bay space, which is a bit of a drawback for a bus conversion.  But those that have them, love them.

Jerry Work&#;s Note: The problem is the company that made most of these &#;CruiseAir&#; units is no longer in business, so parts and repairs are a big problem.  A company in Florida has just started making a drop-in replacement but they are so new to the market we know little about longevity or performance over time.  I will let you know more about these as we learn more.

Mini-splits have become all the rage lately.  They have the condenser unit mounted outside of the bus or better yet, in a bay under the bus in a clean environment, and Freon passes via tubing from the condenser up into the living area of the bus to a blower unit mounted on a wall facing the living area.  

People love these units as they have a low amp draw, and if you have sufficient solar wattage and lithium battery amp hours, you can run these without a generator or being plugged into an external power source. However, they do not have nearly the cooling capacity of the units previously mentioned and they would be hard-pressed to keep the inside of your bus comfortable on a hot day in south Texas, where I am now.  But for milder climates, they work just fine and will heat and cool the inside of a bus very comfortably, and many of them, extremely quietly. A huge advantage.

The other disadvantage of the mini-split units is that the compressor needs to be mounted outside of the living quarters and many people hang them on brackets on the rear of a bus or on hangers under the bus.  Both locations are bad as all the road grime, salt, dirt, dust, snow, and everything else gets kicked up by the tires and get sucked into the condenser unit.  A roof air unit on the other hand is on the roof far away from the dust and dirt.

Many people are beginning to discover that these systems fail prematurely if used on a bus conversion unless extra care is taken to clean them regularly, and even then, they tend to die prematurely due to the environment they are subject to.  

Mounting anything under a bus is the worst thing you can do, especially behind the rear tires, and especially anything that has an electric motor, as they get caked with dust road dirt, and mud on a rainy day and the next thing you know is that they are overheating and they quit working, usually when you need them the most.

So those are your choices for air conditioning in a bus.  One of these systems will be ideal for your situation and budget, depending on where you live and where and when you plan to travel.  Unless you are using your bus as an entertainer coach, with several bunks, you do not need to have five or six air conditioners on the roof.  Three roof air conditioners are generally sufficient for a 40&#; or 45&#; bus without slides, and two mini-split units will keep your bus comfortable when the temperature remains below 100° outside, but nothing like the other units previously mentioned.

One thing you need to be cognizant of is that if you buy a roof air conditioner with a heat pump, as I did once, it will shut down when it gets around 107° outside, so if you plan to drive through Vegas or Houston on a hot summer day, you may be very uncomfortable. I learned that the hard way.  However, as long as you do not travel where it is not excessively hot, you will be fine with one of these heat-pump units and they also do a decent job of heating the inside of your bus as well.

At the other end of the spectrum, if you travel in cold climates, many heat pumps stop heating when the ambient temperature drops below 40° F.  So, if you plan to travel in very hot or moderately cold climates, be sure to check the specifications of the unit you are interested in or alternatively, plan on using an alternate heating system in very cold weather.

When I lived in my bus where the temperatures would become extremely hot during the day, I found that if I started my A/C units early in the morning, before it began getting hot outside, then it stays cooler throughout the day inside.  You are cooling the mass of everything inside the bus to start with, so it holds in the cooler air longer in the day.  

Another thing that people can do that do not have sufficient A/C in a bus, is to close off part of the bus during the hottest times of the day.  So maybe you only cool the driver&#;s area when you are driving, by hanging an insulated curtain behind the cockpit.  Once you are stopped for the day, you may pull the curtain across to keep the heat out of the main part of the bus, because everyone knows, the windshield can radiate more heat than any other window in the bus so the cockpit area can get very hot.

When you are ready to go to bed, you may close off the bedroom, with a door or curtain, to ensure all the cool air from the A/C unit is concentrated in that one room so you can sleep better.

You can also install insulated drapes inside all windows to keep the heat out in the summer.  Many folks that live up north in the winter use insulated drapes to cover all windows to keep the heat in.  You can also park in the shade if possible or get an outside windshield cover to keep the sun off the windshield.  I have an outside windshield cover, electric curtains inside my front windows, and a curtain I hang inside the curtains.  This combination keeps out most of the heat when I am facing the sun during the day.

Awnings are also a big help.  I have a 22&#; awning on the curbside of my bus.  I will usually put it out far enough to keep the hot sun off the windows, and on a really hot day, I put it out even further to keep the sun off the side of my bus above the floor line.  This makes a big difference too.

On the street side of the bus, I have a long awning that covers all of the windows on my bus with the exception of the bedroom.  I have not put them on the bedroom windows at least yet, as that is a small room so the A/C in there is able to keep up even on the hottest day.  Of course, if you can park under a tree or any place you can get shade, that can drop the temperature of your bus down several degrees and that is free. 

Another option is to run a fan or several fans inside your bus to keep the air moving.  I have a 23&#; box fan that I sometimes place on the floor in the doorway to my bedroom, to force the cold air from that room into the main part of the bus. As I said earlier, the A/C works very well in there, so why not force some of that cold air into the main living area of the bus during the day?  I even do this when it is not overly hot outside, as by running the rear roof air in conjunction with a fan, I do not always have to run the front A/C units, so it keeps it quieter up front in the main living/office area.

If you live in a dry climate, another very good option is to buy a TurboKool (evaporative cooler) unit for your roof.  If you have solar and lithium batteries, this is a great solution.  This unit draws very little amperage (2.2A &#; 4.6A at 12V) and will reduce the temperature of the inside of your bus significantly on a hot summer day.

The only drawback to these units is that they drink a lot of water, and they must be plumbed into your fresh water system. But if you have that, these units work great and can drop the inside temperature of a bus or house by 20 &#; 30° F, with very little power consumption. This is generally sufficient to make it comfortable inside. Again, the huge advantage is that this unit runs on your house batteries. 

The company is the world’s best Custom mini bus air conditioning unit Company supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

Here is a video on TurboKool you may enjoy.

Whatever cooling system or method you choose, it may or may be sufficient to keep your bus comfortable on the inside, and &#;comfortable&#; is defined differently for all people.  Some people think 85° F is comfortable in the summer, whereas some people are not comfortable when it is over 72° inside a bus.  

One must take into consideration where they plan to travel and at what times of the year.  Many people travel north in the summer and south in the winter, so this is not an issue for them.  But for those that must deal with extreme temperature changes, I hope this helps you to choose the best option or combination of options noted above for your bus conversion lifestyle.

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 forelectric bus air conditioning. Whether it is cooling capacity or parking use, it can easily meet your needs.

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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.

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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