Question: What Is Latent Cooling?

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..

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 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 an example of latent heat?

For example, when a pot of water is kept boiling, the temperature remains at 100 °C (212 °F) until the last drop evaporates, because all the heat being added to the liquid is absorbed as latent heat of vaporization and carried away by the escaping vapour molecules.

What is latent capacity?

Latent capacity is one aspect of scalability where you include additional performance and availability resources into your system so the system can easily handle unusual peak loads. … Your system design should be able to handle projected capacity for a reasonable time, generally the first 6 to 12 months of operation.

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.

What is latent heat of condensation?

Latent heat of condensation is energy released when water vapor condenses to form liquid droplets. An identical amount of calories (about 600 cal/g) is released in this process as was needed in the evaporation process.

What is latent heat used for?

The latent heat of fusion is the heat required for an object to go from the solid state to the liquid state, or vice versa. Since its value is generally much higher than specific heat, it allows you to keep a beverage cold for much longer by adding ice than simply having a cold liquid to begin with.

How do you calculate latent heat?

The specific latent heat is different for solid to liquid transition and liquid to gas transition. For example, if we want to turn 20 g of ice into water we need Q = 20 g * 334 kJ/kg = 6680 J of energy. To turn the same amount of water into vapor we need Q = 45294 J .

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 the difference between heat and latent heat?

Specific heat is the amount of heat required to raise the temperature of a substance a certain amount. Latent heat is the amount of heat released during a change of state, i.e. the boiling of water or the melting of ice.

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 Latent Heat 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 are the 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 Latent Heat in refrigeration?

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. Appreciating this difference is fundamental to understanding why refrigerant is used in cooling systems.

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.

What are the application of latent heat?

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.