Rahasia Desain Radiator Yang Membuat Air Tidak Cepat HABIS.

Summary

In this educational video, the speaker explains the functionality of the coolant system in a 1998 Kijang LGX vehicle used by Universitas PG Yogyakarta. Over a span of 3 to 6 months, the vehicle maintains stable coolant levels, illustrating the efficiency of its radiator system. The speaker delves into the science behind the boiling point of water, the effect of pressure on it, and how the radiator cap helps maintain system pressure to prevent evaporation. Additionally, the importance of regular maintenance and checks for leaks is emphasized to ensure the cooling system remains effective over time.

Takeaways

• 😀 The 1998 Kijang LGX has been in use at Universitas PG Yogyakarta for over 22 years, serving as a service vehicle.
• 😀 The vehicle’s coolant system has remained stable, with no coolant loss over 3 to 6 months, indicating good maintenance.
• 😀 The speaker compares the Kijang LGX’s coolant system to that of a diesel-powered vehicle, which requires frequent coolant refills after only a few hours of use.
• 😀 The boiling point of water depends on the surrounding pressure, and at 1 atmosphere, water boils at 100°C.
• 😀 The speaker explains that a vehicle’s cooling system can handle higher temperatures if the pressure in the radiator is maintained above 0.9 kg/cm².
• 😀 The radiator cap plays a crucial role in maintaining the pressure within the cooling system, preventing coolant evaporation.
• 😀 If the pressure exceeds 0.9 kg/cm², the radiator cap opens to release the pressure and maintain system stability.
• 😀 The absolute pressure inside the radiator system is calculated by adding atmospheric pressure to the measured pressure, which can raise the boiling point of the coolant.
• 😀 The radiator system is designed to handle temperatures up to around 120°C, almost 20°C higher than the normal boiling point of water at 1 atmosphere of pressure.
• 😀 Despite the coolant lasting for several months, it is important to conduct daily checks for potential leaks to ensure the system’s integrity and avoid loss of coolant.
• 😀 The speaker concludes by promoting the UPY Peduli scholarship, aimed at assisting students affected by COVID-19.

Q & A

What is the significance of the 1998 Kijang LGX's cooling system in the video?

The cooling system of the 1998 Kijang LGX is highlighted for its longevity, as the coolant in the system can last between 3 to 6 months without needing to be topped off. This is due to the proper pressure management in the system, which helps maintain the coolant's effectiveness.

Why does the 1998 Kijang LGX not require frequent coolant refills, as mentioned in the video?

The coolant in the 1998 Kijang LGX lasts for an extended period due to the radiator’s pressure cap, which maintains optimal pressure, preventing the coolant from evaporating or decreasing in volume. As a result, it can last for 3 to 6 months without needing a refill.

How does the boiling point of water change with pressure, according to the video?

The boiling point of water increases as the pressure rises. For instance, water boils at 100°C at standard atmospheric pressure (1 atmosphere), but the boiling point increases to about 200°C when the pressure is raised to 15.5 bar.

What role does the radiator cap play in maintaining the cooling system’s efficiency?

The radiator cap helps maintain the correct pressure within the cooling system. It only opens when the pressure reaches 0.9 to 1 kg/cm², ensuring that the coolant remains at a high temperature without boiling or evaporating too quickly.

What is the importance of understanding absolute pressure in the context of the cooling system?

Absolute pressure refers to the total pressure exerted, including atmospheric pressure. In the context of the cooling system, understanding absolute pressure helps determine the true pressure inside the system and ensures that the coolant remains effective without boiling.

How does the cooling system prevent coolant evaporation, as discussed in the video?

The cooling system prevents coolant evaporation by maintaining a controlled pressure environment using the radiator cap. This pressure keeps the coolant from reaching its boiling point, ensuring it doesn't evaporate quickly and remains in the system.

What happens when the pressure in the radiator system exceeds the normal limit?

When the pressure in the radiator system exceeds the normal limit (0.9 to 1 kg/cm²), the radiator cap opens to release excess pressure, preventing damage to the system and ensuring the coolant doesn’t boil or evaporate.

What is the relationship between the boiling point and pressure based on the graph shown in the video?

The graph shows that the boiling point of water rises as pressure increases. At 1 atmosphere, water boils at 100°C, while at higher pressures (such as 15.5 bar), the boiling point can reach around 200°C.

What is the impact of having a well-maintained cooling system on the vehicle?

A well-maintained cooling system ensures that the vehicle's engine runs efficiently by preventing the coolant from boiling off or evaporating too quickly. This helps avoid engine overheating, improves the longevity of the cooling system, and reduces the need for frequent maintenance.

What educational opportunity is mentioned in the video for high school graduates?

The video mentions a scholarship opportunity at the University of PGRI Yogyakarta (UPY) for high school, vocational school, and equivalent graduates. The scholarship is part of UPY’s response to the impacts of COVID-19, offering financial assistance for various degree programs in fields like engineering, architecture, and health sciences.