Title: Unit 3 Outline
Course: HET 191 HVACR Heat Load > Section: HET 191 HVACR Heat Load

Unit 3 Outline

Unit 1 Outline
Unit 3 Outline

Heat Loss Factor

Objectives

The HVAC learner will study the effects of how heat is loss during the winter and how to choose the proper materials to reduce the losses through the building.

Introduction

The winter low outdoor temperatures can affect the energy cost, people comfort, and the building physically by how the building maintains a consistent indoor temperature. Therefore, heating equipment is design to add the proper amounts of heat during the coolest days outdoors. People feel the most comfortable at a temperature of 75⁰ F and a humidity of 50% RH. Even the build need to have consistent indoor temperature and humidity or the building could have failure from moister build-up and expansion and contraction of the building materials. Understand how heat is transferred through different type of materials is critical to know for a HVAC technician.

Calculation the Heat Load
- Formulas for Heat Loss
- Heat Transfer Factor of Material

Heat Loss Variables
- Ventilation
- Lights
- People
- Machinery

Transmission Losses
- Type of material
- Thickness and thermal conductivity
- Area of the Material
- Temperature difference between indoors and outdoors

Infiltration Losses
- Heat losses by air entering the home

Ventilation Losses
- Mechanical systems  effect

Duct Losses
- Ducts leakage
- Ducts in unconditioned spaces

Review the vocabulary terms listed below and look up their definitions / descriptions before taking the Vocabulary Quiz.

Vocabulary

- Terms
- R Factor
- U Factor
- Infiltration
- Exfiltration
- Heat Transfer Factor
- Air Change
- Variable
- Conduction
- Convection
- Radiation
- Design Temperature
- Outside Design Temperature
- Inside Design Temperature
- Make-up Air