- Why is latent heat hidden?
- What is a latent load?
- What is the difference between sensible and latent cooling?
- What is latent and sensible heat?
- How do you calculate latent heat?
- What do you get when you mix sensible and latent heat?
- Why is latent heat important?
- What does high latent heat mean?
- Can latent heat be measured?
- What is latent heat capacity?
- How do you calculate latent heat of air?
- What is the latent heat of steam?
- Is sweating latent heat?
- What causes latent heat?
- Can you feel latent heat?
Why is latent heat hidden?
Latent heat is sometimes called the ‘hidden’ or ‘stored’ heat used to change the state of a substance without a change in temperature.
The temperature does not increase as the water (liquid) starts to evaporate and become water vapour (a gas)..
What is a latent load?
Latent cooling load is a measure of the amount of energy that is necessary to dehumidify the air in a building, for example, regardless of the outdoor humidity. Cooling load needs to be considered when a cooling system is being dimensioned. Latent cooling load refers to the wet bulb temperature.
What is the difference between sensible and latent cooling?
The sensible cooling load refers to the dry bulb temperature of the building and the latent cooling load refers to the wet bulb temperature of the building. For summer conditions the humidity influence on the selection of the HVAC equipment and the latent load as well as the sensible load must be calculated.
What is latent and sensible heat?
Latent and sensible heat are types of energy released or absorbed in the atmosphere. Latent heat is related to changes in phase between liquids, gases, and solids. Sensible heat is related to changes in temperature of a gas or object with no change in phase.
How do you calculate latent heat?
Latent Heat Of Fusion FormulaL = specific latent heat of fusion of substance.The total amount of heat absorbed or liberated by the material is.Let c be the specific heat of the metal.Heat gained by the metal.Q = 60 × c × (100 – 20)Q = 60 × c × 80 cal.Heat given is equal to Heat taken.0.5 × 540 = 60 × c ×80.
What do you get when you mix sensible and latent heat?
Enthalpy is the sum of the sensible and latent heat in a given air-vapor mix. It is sometimes referred to as the total heat of the air. The units for sensible heat, latent heat, and enthalpy are the same: BTU/lb of dry air.
Why is latent heat important?
Latent heat is an important source of energy in the development of thunderstorms and hurricanes. Water vapor strongly absorbs infrared radiation, making it an important gas in the Earth’s heat-energy balance. In fact water vapor is the largest contributor to the greenhouse effect on Earth.
What does high latent heat mean?
The latent heat of vaporization is the thermal energy required for a liquid to vaporize to a gas or the amount that is released when a gas condenses to a liquid. Water has a high latent heat of vaporization, which is why steam burns are so dangerous.
Can latent heat be measured?
A thermometer measures temperature. Heat energy or calorific value is measured by a calorimeter. Latent heat is the heat required for phase change. … Thus a thermometer cannot measure any temperature change when heat is supplied during phase change, otherwise known as latent heat.
What is latent heat capacity?
Latent heat, energy absorbed or released by a substance during a change in its physical state (phase) that occurs without changing its temperature. … The latent heat is normally expressed as the amount of heat (in units of joules or calories) per mole or unit mass of the substance undergoing a change of state.
How do you calculate latent heat of air?
Since our latent heat value is in the units of btu/hour and we presently have “minute” units, we must convert to hours by mulitplying by 60. QL → (btu/hr) = ΔW (grains/lb) x Airflow (cubic feet/minute) x 60 minutes/hour x ?
What is the latent heat of steam?
As the latent heat of steam at atmospheric pressure is 2257 kJ/kg the amount of flash steam produced will be 299/2257 = 0.133 kg/kg of condensate.
Is sweating latent heat?
The heat that is absorbed when perspiration evaporates (by breaking bonds between water molecules, thereby increasing its potential energy) is called the latent heat of vaporization. … This seems like a lot of energy!
What causes latent heat?
Latent heat is associated with the change of phase of atmospheric or ocean water, vaporization, condensation, freezing or melting, whereas sensible heat is energy transferred that is evident in change of the temperature of the atmosphere or ocean, or ice, without those phase changes, though it is associated with …
Can you feel latent heat?
However, although you cannot feel it, the liquid has stored all that latent heat. The only way you will observe the latent heat is if you try to transform the water back to ice. … Heat energy is conserved no matter how the phase change occurs. If you put heat into water, it can evaporate.