However, when we go from liquid to vapour
Posted: Thu Dec 12, 2024 9:23 am
The mixture of liquid and solid continues at the constant melting temperature until all the solid has passed into a liquid state.
When there is only liquid, the heat transferred increases the temperature, which would mean a new transfer in the form of sensible heat.
Normally, the latent heat is, in magnitude, much higher than the sensible heat.
Latent heat of water
If we focus on the latent heat of water, it is important list of yemen consumer email to note that it is not the same for the different processes of vaporization, condensation and fusion.
In this case, the latent heat of fusion (change from solid to liquid) requires 334 kJ/kg of heat for 1 kg of ice at 0 °C to transform into 1 kg of water at 0 °C.
(latent heat of vaporisation) at a temperature of 100 °C, 2,260 kJ/kg are needed.
Let's explain this in more detail with an example. Imagine an ice cube, which is at a temperature below 0 °C. From the moment it reaches 0 °C until it melts completely, the temperature of that water will not change. Why? Because the heat of change of state does not cause the temperature to change, but simply causes that water cube to change from a solid to a liquid state (latent heat of fusion).
Later, once the water has melted, the temperature will increase. When it reaches 100 °C, the water will change state again, going from liquid to vapour (latent heat of vaporisation of water). In this process, the temperature will remain at 100 °C until it has completely evaporated. Again, there is no change in temperature, but in state.
How does it affect the cooling process?
Latent heat exerts a certain influence on any refrigeration process. In fact, when we introduce any product into a refrigeration chamber, there are three distinct stages that form part of the process:
a) Sensible cooling from when the product goes from the initial temperature to the freezing temperature.
b) Latent cooling (latent heat) in the freezing process, without any thermal change.
c) Sensible cooling from when it goes from the freezing temperature until it reaches the desired final temperature, which is the conservation temperature. In this sense, the ideal temperature will be different depending on the composition and structure of each product.
The latent heat of solidification reappears when the liquid is cooled to its melting temperature and begins to take on a solid appearance. As heat is extracted from the product, it solidifies and its temperature does not drop. The heat released when a certain mass of product becomes solid, without changing its temperature, is also the latent heat of fusion.
When there is only liquid, the heat transferred increases the temperature, which would mean a new transfer in the form of sensible heat.
Normally, the latent heat is, in magnitude, much higher than the sensible heat.
Latent heat of water
If we focus on the latent heat of water, it is important list of yemen consumer email to note that it is not the same for the different processes of vaporization, condensation and fusion.
In this case, the latent heat of fusion (change from solid to liquid) requires 334 kJ/kg of heat for 1 kg of ice at 0 °C to transform into 1 kg of water at 0 °C.
(latent heat of vaporisation) at a temperature of 100 °C, 2,260 kJ/kg are needed.
Let's explain this in more detail with an example. Imagine an ice cube, which is at a temperature below 0 °C. From the moment it reaches 0 °C until it melts completely, the temperature of that water will not change. Why? Because the heat of change of state does not cause the temperature to change, but simply causes that water cube to change from a solid to a liquid state (latent heat of fusion).
Later, once the water has melted, the temperature will increase. When it reaches 100 °C, the water will change state again, going from liquid to vapour (latent heat of vaporisation of water). In this process, the temperature will remain at 100 °C until it has completely evaporated. Again, there is no change in temperature, but in state.
How does it affect the cooling process?
Latent heat exerts a certain influence on any refrigeration process. In fact, when we introduce any product into a refrigeration chamber, there are three distinct stages that form part of the process:
a) Sensible cooling from when the product goes from the initial temperature to the freezing temperature.
b) Latent cooling (latent heat) in the freezing process, without any thermal change.
c) Sensible cooling from when it goes from the freezing temperature until it reaches the desired final temperature, which is the conservation temperature. In this sense, the ideal temperature will be different depending on the composition and structure of each product.
The latent heat of solidification reappears when the liquid is cooled to its melting temperature and begins to take on a solid appearance. As heat is extracted from the product, it solidifies and its temperature does not drop. The heat released when a certain mass of product becomes solid, without changing its temperature, is also the latent heat of fusion.