What Does High Latent Heat Mean?

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 sensible and latent heat in HVAC?

The heat added to keep the water boiling is latent heat. Heat that causes a change of state with no change in temperature is called latent heat. … Sensible capacity is the capacity required to lower the temperature and latent capacity is the capacity to remove the moisture from the air.

Why is latent heat of vaporization high?

Thus a liquid can flow, unlike a solid. … The energy required to completely separate the molecules, moving from liquid to gas, is much greater that if you were just to reduce their separation, solid to liquid. Hence the reason why the latent heat of vaporization is greater that the latent heat of fusion.

What is latent heat in HVAC?

Latent heat is the heat the results from an increase or decrease in the amount of moisture held by the air. Specifically, it’s the amount of energy needed to cause a phase change (for our purposes, liquid-to-gas or gas-to-liquid) without changing the actual temperature of a substance.

What is the latent heat of water?

Changing of phase undergoes a heat transfer, but the temperature of the substances remains constant. So, the heat necessary for phase changes of water from solid to liquid or gas, or liquid to solid or gas, without any temperature alteration is known as latent heat of water.

How do you get 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.

What does latent heat mean?

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.

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 is difference between sensible heat and latent heat?

Sensible heat is the heat that causes an object to change temperature. When an object is heated the increase in heat is called the ‘sensible heat’. When the temperature of an object falls, the heat removed is called ‘sensible heat’. Latent heat is the heat the heat added to an object in order for it to change state.

Can you feel latent heat?

If it condenses on its own, it will give off (sensible) heat and get warmer. Therefore sensible heat can be felt while latent heat is the type of heat that cannot be felt.

What are the application of latent heat?

Answer. The specific latent heat of vaporisation for water is large. Plates filled with food are able to absorb heat from the hot steam. The condensation of steam at the base of the plate releases a large quantity of heat and thus enables food such as cakes,fish, eggs and others to be steamed.

What is Latent Heat formula?

The amount of heat energy absorbed or released for a phase change is known as latent heat. The latent heat formula is given by, L = Q / M. Where, Q = amount of heat.

What are two types of latent heat?

Two common forms of latent heat are latent heat of fusion (melting) and latent heat of vaporization (boiling). These names describe the direction of energy flow when changing from one phase to the next: from solid to liquid, and liquid to gas.

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.