Ayrton Oneill
Reverse cycle air conditioners work in a similar way to the air conditioning in your home or apartment. They can be used to cool or heat the air in a boat by transferring thermal energy from the water surrounding the vessel. The refrigerant flows in the opposite direction to a regular air conditioner, meaning that the heat from the seawater is pumped into the boat, and the cold from the boat is pumped back out.
| Characteristics | Values |
|---|---|
| How it works | The refrigerant flows in the opposite direction to a regular air conditioner, transferring heat from the seawater into the boat (and cold from the boat back out) |
| Temperature control | You set a temperature and the air conditioner will keep the boat within a few degrees of this |
| Downsides | Recirculates the same air, so it's recommended to open the hatches on nice days to change the air in the boat |
| The system loses efficiency if there isn't enough refrigerant | |
| The reversing valve in the system can stick if it's not activated regularly | |
| The dumping of the boat's thermal load won't take place efficiently if the outside water temperature is hotter than 32°C | |
| The boat won't take on heat if the water is cooler than 13°C |
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What You'll Learn
- Reverse cycle heating and air conditioning work similarly to those in your home
- The refrigerant flows in the opposite direction
- The refrigerant is needed for each part of the process
- The system loses efficiency if there isn't enough refrigerant
- The dumping of its thermal load won't take place efficiently if the outside water temperature is hotter than 32°C
Reverse cycle heating and air conditioning work similarly to those in your home
Reverse cycle air conditioning works by transferring thermal energy from the water surrounding the vessel. It is a balanced heat-exchanging mechanism, although it can go wrong if the temperature differential between the boat cabin and water are functionally inadequate. For cooling a boat, the dumping of its thermal load won't take place efficiently if the outside water temperature is hotter than 32°C. Likewise, the craft won't take on heat if the water is cooler than 13°C.
The refrigerant flows in the opposite direction to a standard air conditioner. The compressor pumps hot, pressurised refrigerant into the air handler where it transfers its heat to the cabin via the flow of cool cabin air over the coils. The refrigerant then flows through the expansion valve to the condenser, where the now very cold refrigerant picks up heat from the seawater and carries it through the compressor to the cabin.
The main difference between a marine heat pump and a home heat pump is that the former takes heat from seawater, while the latter takes heat from the outside air.
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The refrigerant flows in the opposite direction
Reverse cycle air conditioning works by reversing the flow of refrigerant. The compressor pumps hot, pressurised refrigerant into the air handler, where it transfers its heat to the cabin via the flow of cool cabin air over the coils. The refrigerant then flows through the expansion valve to the condenser, where the now very cold refrigerant picks up heat from the seawater and carries it through the compressor to the cabin. This is the opposite of how a regular air conditioning unit works, which pumps heat from the boat into the seawater.
The refrigerant, also known as Freon, is needed for each part of the process and goes through extreme pressure, phase and temperature changes. The system loses efficiency very quickly if there isn't enough refrigerant and/or if the refrigerant is replaced with air, which makes a terrible refrigerant.
The process can be explained as follows: the water flows over the evaporator, slightly heating it up, and the cabin air flows through the condenser. This is achieved by reversing the compressor flow.
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The refrigerant is needed for each part of the process
Reverse cycle air conditioners work by pumping refrigerant in the opposite direction to a standard air conditioner. The refrigerant is needed for each part of the process. The compressor pumps hot, pressurised refrigerant into the air handler, where it transfers its heat to the cabin via the flow of cool cabin air over the coils. The refrigerant then flows through the expansion valve to the condenser, where the now very cold refrigerant picks up heat from the seawater and carries it through the compressor to the cabin.
The refrigerant goes through extreme pressure, phase and temperature changes, so the system loses efficiency very quickly if there isn't enough refrigerant. If the refrigerant is replaced with air, the system also loses efficiency because air makes a terrible refrigerant.
The refrigerant is also needed to cool the boat. The refrigerant condenses in a coil filled with raw water. The dumping of the boat's thermal load won't take place efficiently if the outside water temperature is hotter than 32°C.
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The system loses efficiency if there isn't enough refrigerant
Reverse cycle air conditioners work by pumping heat from the seawater into your boat, and cold air from your boat back out. This is the opposite of how air conditioning works, where the refrigerant flows in the opposite direction. The refrigerant is needed for each part of the process and goes through extreme pressure, phase and temperature changes. This means that the system loses efficiency very quickly if there isn't enough refrigerant. If there is a lack of refrigerant, the system will not be able to maintain a steady temperature. The refrigerant is also known as Freon, and it is important that it is not replaced with air, which makes a terrible refrigerant.
The compressor pumps hot, pressurised refrigerant into the air handler where it transfers its heat to the cabin via the flow of cool cabin air over the coils. The refrigerant then flows through the expansion valve to the condenser, where the now very cold refrigerant picks up heat from the seawater and carries it through the compressor to the cabin. This process is highly efficient, but it relies on there being enough refrigerant to work properly.
If there is not enough refrigerant, the compressor will have to work harder to pump the refrigerant around the system. This will increase the wear and tear on the compressor and could lead to it breaking down. Additionally, if there is not enough refrigerant, the system will not be able to cool the boat as effectively, as there will not be enough refrigerant to absorb the heat from the seawater.
It is important to regularly check the refrigerant levels in a reverse cycle air conditioner and top them up if necessary. This will help to ensure that the system is running efficiently and effectively, and will prolong the life of the compressor.
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The dumping of its thermal load won't take place efficiently if the outside water temperature is hotter than 32°C
Reverse cycle air conditioners work in a similar way to air conditioning units in homes, except the refrigerant flows in the opposite direction. The compressor pumps hot, pressurised refrigerant into the air handler, where it transfers its heat to the cabin via the flow of cool cabin air over the coils. The refrigerant then flows through the expansion valve to the condenser, where the now very cold refrigerant picks up heat from the seawater and carries it through the compressor to the cabin.
However, the dumping of its thermal load won't take place efficiently if the outside water temperature is hotter than 32°C. This is because the refrigerant needs to be colder than the water to absorb heat from it. If the water is hotter than 32°C, the refrigerant won't be able to absorb enough heat to cool the boat effectively. In this case, the air conditioner will have to work harder to cool the boat, which can lead to increased energy consumption and higher operating costs. It may even cause the air conditioner to break down due to overheating.
To prevent this from happening, it is important to ensure that the air conditioner is properly maintained and that the refrigerant levels are checked regularly. If the refrigerant level is too low, the air conditioner may not be able to absorb enough heat to cool the boat effectively, even if the outside water temperature is below 32°C.
Additionally, it is worth noting that reverse cycle air conditioners can also struggle to cool a boat effectively if the temperature differential between the boat cabin and the water is too large. This is because the air conditioner needs to be able to transfer heat between the cabin and the water efficiently, and if the temperature difference is too large, this can be difficult to achieve.
Overall, while reverse cycle air conditioners can be a great way to control the temperature of a boat, it is important to be aware of their limitations and ensure that they are properly maintained to avoid any issues.
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Frequently asked questions
Reverse cycle air conditioners work by transferring thermal energy from the water surrounding the boat into the boat. This is the opposite of how air conditioning works, where the heat is pumped from the boat into the water.
Reverse cycle air conditioners use the same principle as air conditioning, except the refrigerant flows in the opposite direction.
The compressor pumps hot, pressurised refrigerant into the air handler where it transfers its heat to the cabin via the flow of cool cabin air over the coils. The refrigerant then flows through the expansion valve to the condenser, where the now very cold refrigerant picks up heat from the seawater and carries it through the compressor to the cabin.
Reverse cycle air conditioning offers a steady air temperature in the boat. If you set it to 70F, it will get no colder than 68F and no warmer than 72F.
Reverse cycle air conditioning recirculates the same air, so it's a good idea to open the hatches on nice days to completely change over the air in the boat.
