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Are you comfortable?

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18 Jan Are you comfortable?

Thermal sensation of a human being is mainly related to the thermal balance of its body as whole.This balance is influenced by two groups of factors personal and physical.

The major objective of HVAC engineers is to create an environment, where every person can live in thermal comfort. However thermal comfort is a subjective sensation. So, the realistic aim is to create a thermal environment, which satisfies the maximum possible percentage of people in a given room
taken as a group.

When the personal factors have been estimated and the physical factors have been measured the thermal sensation for the body as a whole can be predicted by calculating the Predictive Mean Vote index (PMV) and thermal discomfort can be predicted by calculating Predictive Percent Dissatisfied
index (PPD) equivalent to thermal discomfort.

The PPD index (Predictive percent Dissatisfied), obtained from the PMV index provides information on thermal discomfort by predicting percentage of people likely to feel too hot or too cold in the given thermal environment. Even though a person feel thermally neutral for a body as a whole, it
may not be comfortable if some parts of its body are warm or cold. Unwanted local cooling or
heating may cause thermal discomfort.

The PMV index predicts the mean value of the votes of large group of persons on the following 7 point thermal sensation scale.

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Thermal sensation of a human being is mainly related to the thermal balance of its body as whole.This balance is influenced by two groups of factors personal and physical.

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How SOLIDWORKS Flow Simulation gives solutions for calculation Comfort parameters.

The HVAC Application in SOLIDWORKS Flow simulation helps engineers to quickly and accurately model complex systems for fluid flow analysis. This module can solve tough challenges for designing
efficient cooling systems for people and large-scale environments, lighting systems.

The procedure we follow in SOLIDWORKS is very simple which follows below:

  • Design the environment which resembles the actual conditions
  • Set up an project by defining the ambient conditions and radiation parameters
  • Defining the material and heat sources for the individual parts and assemblies
  • Setting up the solver to solve the comfort parameters and defining the required goals
  • Identifying comfort parameters by studying PMV and PPD index plot.
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The HVAC application module in SOLIDWORKS Flow Simulation provides industry specific tools and methodologies that deliver power and productivity modelling complex systems