What is the difference between sensible and total cooling capacity

TB - You make my fingers cramp up just reading your response. Great answer - You have a way of converting engineering into everyday language. I hope you teach somewhere. Originally Posted by teddy bear.

This could be a learning experience for all of us. The answer to your burning question, the cooling coil adjust to any cooling load. If there is no latent cooling load at the coil temp, the coil removes more sensible btus. Latent cooling only occurs when the coil temp is below the dew point of the air being cold. Colder coils remove less sensible and more latent heat. As the sun sets, the sensible cooling loads on the home may decline to near zero. While latent cooling load declines very little.

The thermostat senses temperature which represent sensible cooling load. The dew point of the air represents the latent part of the load. In addition some use the wet bulb temp at a specific temp to describe moisture levels. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data. Google use cookies for serving our ads and handling visitor statistics.

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Make Shortcut to Home Screen? There are two types of cooling loads: sensible cooling load latent cooling load 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. Cooling and Heating Equations Factors that influence sensible cooling load Glass windows or doors Sunlight striking windows, skylights, or glass doors and heating the room Exterior walls Partitions that separate spaces of different temperatures Ceilings under an attic Roofs Floors over an open crawl space Air infiltration through cracks in the building, doors, and windows People in the building Equipment and appliances operated in the summer Lights Notice that below grade walls, below grade floors, and floors on concrete slabs do not increase the cooling load on the structure and are therefore ignored.

Two items that may require additional sensible cooling capacity from the HVAC equipment are duct work located in an unconditioned space ventilation air air that is mechanically introduced into the building Sensible Heat Load and Required Air Volume Chart sensible heat load equations Sensible heat load - heating or cooling - and required air volume to keep temperature constant at various temperature differences between entering air and room air are indicated in the chart below: Sensible Heat Load and Required Air Volume Chart pdf Factors that influence to the latent cooling load Moisture is introduced into a structure through: People Equipment and appliances Air infiltration through cracks in the building, doors, and windows Other latent heat gain is taken care of by the HVAC equipment before the air reaches the rooms system gain.

The sensible cooling load is a measurement of the amount of energy that must be removed from, for example, the air inside a building, in order to maintain a certain temperature, regardless of the temperature outside.

Cooling load must be taken into account when calculating the capacity of a cooling system. Sensible capacity is the capacity required to lower the temperature and latent capacity is the capacity to remove the moisture from the air. Sensible heat is what registers on your thermostat. It reflects a temperature change. Technically speaking, sensible heat refers to the amount of energy needed to increase or decrease the temperature of some substance, independent of phase changes like a gas-to-liquid phase change.

The entire sum of cooling capacity generated is known as the total cooling capacity. The proportion that is used for purposely cooling the air is called sensible cooling capacity.

Any proportion of the cooling capacity inadvertently used to dehumidify the air is called latent cooling capacity. Nominal cooling capacity is what the consumer hears.

A nominally rated 2 ton unit may only be a 1 ton unit at the conditions you want to operate it at. Sensible Heat Ratio — SHR — is defined as the sensible heat or cooling load divided by the total heat or cooling load.

Sensible heat ratio SHR is the term used to describe the ratio of sensible heat load to total heat load. Sensible heat is the energy needed to speed up molecules. In summary, both sensible and latent heat play important roles in cooling systems.

When a building is cooled, the energy consumed is not only used to lower the temperature from 95 to 55, but also to remove the energy stored in the evaporated water molecules. To measure heating Btu, multiply the measure supply airflow in cfm by the temperature change from the average supply register temperature to the average return grille temperature, and multiply this total by the formula constant of 1.

Sensible heat is an increase in heat level or heat intensity which can be measured with a temperature-measuring device. In other words, sensible heat is heat which causes a temperature rise in an object, which can readily be measured with a temperature-measuring device such as a thermometer. It is also called total heat orenthalpy of water or liquid heat invariably. If the temperature before a cooling coil is 75F and the temperature after the cooling coil is 55F, subtract 55F from a 75F to find a delta t of 20F.

What is the difference between sensible and non sensible heat? Sensible heat is heat that is gained or loss measured by a thermometer or other device. Non sensible is heat that is loss during water freezing is not able to be measure by a thermometer. When water is heated, latent heat of vaporisation is consumed to overcome the intermolecular forces of attraction at a constant temperature.