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.
How do you calculate latent heat BTU?
The easiest way to find latent Btu is to subtract delivered sensible Btu from the delivered total Btu. A simple formula to find latent Btu is total Btu minus sensible Btu.
What is latent heat with example?
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 the formula for calculating BTU?
For example, a 300 square foot room typically requires 7,000 BTUs to maintain a comfortable temperature, while a 1,000 square foot room requires 18,000 BTUs. A simple formula to determine your heating needs is: (desired temperature change) x (cubic feet of space) x . 133 = BTUs needed per hour.
Which is equation of latent heat load calculation?
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 a Manual J calculation?
The Manual J calculation is a formula that identifies the HVAC capacity of a building. It might also be called an HVAC load calculation because it describes the size of equipment needed to heat and cool a building. The primary users of the Manual J calculation are HVAC installers, technicians and contractors.
What is sensible heat formula?
As the name implies, sensible heat is the heat that you can feel. This is written as: Sensible heat = (mass of the body) * (specific heat capacity) * (change of the temperature) The equation is. Q= m c ΔT.