What are the definitions of sensible heat and latent heat? What’s the connection between the two of them? Could you give a few examples to illustrate? Prize available! ! !
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What are their respective areas of application?
This post was last edited by Chemical Gas Purification on 2010-9-25 at 11:11. The heat that must be absorbed or released by a substance during heating or cooling, without a change in its phase state, is known as \"sensible heat\". It can cause people to experience a noticeable change in temperature, which can usually be measured with a thermometer. (The heat absorbed when raising water from 20°C to 80°C is called sensible heat.) ) During the process in which a substance absorbs or releases heat, its phase changes (such as gas turning into liquid…), but its temperature remains unchanged; the heat absorbed or released in this way is called \"latent heat\". “\"Latent heat\" is something that cannot be measured with a thermometer nor felt by the human body, but can be calculated through experiments. When saturated air absorbs a certain amount of heat (i.e., releases heat), some of the water vapor undergoes phase change into liquid water, and the temperature of the saturated air does not drop at this point; the heat released in this process is known as \"latent heat\".
Sensible heat is the heat absorbed or released by a substance without undergoing a phase change (such as solid-to-liquid or liquid-to-gas transformation), while latent heat is the heat absorbed or released during a phase change. For example, it takes 40.62 kj of heat to evaporate 1 mol of water (at 100°C) into 1 mol of water vapor (at 100°C), and this amount of heat is the latent heat ； The heat that must be absorbed to raise 1 mol of water at 60°C to 100°C (without any water vapor being generated), which is approximately 3.014 kJ, is the sensible heat.
The heat released or absorbed due to a change in phase at the same temperature is latent heat, such as when water evaporates or freezes. The heat absorbed or released in the same phase due to changes in temperature is known as sensible heat; for example, when water at 30 degrees Celsius is heated to 60 degrees Celsius.
I remember we discussed this concept two or three months ago
170-degree superheated low-pressure steam, 3 KG; cooled with water to 70 degrees – how should this be understood?
This post was last edited by Chemical Gas Purification on 2010-9-25 at 11:24. You mean a temperature reduction valve, right – one that is used to lower the temperature. This is sensible heat
The concept could seem to be even broader; for example, the CO gas carried away by the intermittent gasification purge gas can also be referred to as latent heat loss.
The heat that must be absorbed or released by a substance during heating or cooling, so that its temperature rises or falls without changing its phase, is known as \"sensible heat\". It can cause people to experience a noticeable change in temperature, which can usually be measured with a thermometer. (The heat absorbed when raising water from 20°C to 80°C is called sensible heat.) Latent heat: The heat absorbed or released by a substance during a phase change (a change in its state of matter), without a change in temperature, is called \"latent heat\". A substance absorbs latent heat when it transitions from a low-energy state to a high-energy state, and releases latent heat in the reverse direction. For example, when a liquid boils, part of the latent heat absorbed is used to overcome the attractive forces between molecules, while another part is used to do work against atmospheric pressure during expansion. Enthalpy of fusion, enthalpy of vaporization, and enthalpy of sublimation are all latent heats. The amount of latent heat is often expressed as the heat absorbed or released per unit mass of a substance, or per mole of a substance during phase change.
Simply put, sensible heat refers to temperature changes without any phase change, while latent heat involves phase changes with no change in temperature
Reply to 6# keshaping: This process involves both sensible heat and latent heat; the superheated steam first cools down to saturated steam, which is a case of sensible heat. Then the saturated steam cools down to saturated water, which is the latent heat. Finally, the saturated water is cooled again to become subcooled liquid, which represents sensible heat.