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Announcements

Join us on Thursday, March 14th for Exam 1 review session covering VAV vs. CAV and overall HVAC systems. Explore key concepts and materials to ace the exam. Prepare with Homework Assignment 3 and dive into psychrometric charts, heat transfer, heating and cooling loads, and more.

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Announcements

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  1. Announcements Next Class (Thursday, March 14th): Exam 1 • Max 90 minutes! • We will start at 10:55 am. • Open book Open notes • Comprehensive

  2. Objective • VAV vs CAV and overall HVAC system • Finish with HW3 • Review the class material for exam

  3. 55°F 62°F 55°F Require less cooling Multizone constant air volume with reheat

  4. 55°F 55°F 55°F Vary the flow Multizone VAV

  5. Heating and cooling energy production Building HVAC - Delivery Systems Transport - refrigerant - water - …. Energy storage plant Cooling plant Heating plant All air system (can use water or refrigerant in cooling coil) All water system (for heating you can use steam instead water) Combined system CAV With Zonal terminal units VAV With reheater • DOAS Multi zone • air • system • - Ventilation • - Building • latent load • water • system • -Building • sensible load Single zone (a whole apartment can be the single zone) Multi zone Fan Coil Baseboard heater Radiant panels Dual duct VAV floor ceiling CAV-VT VAV

  6. Homework Assignment 3 Table 1 Results of cooling load calculation and required amount of fresh air for ventilation

  7. Review • What is purpose of psychrometric chart? • What quantities are on axes? • Diagonal lines? • Curved lines? • What is significant about the saturation curve? • How do you find the dew point temperature? • How to find the enthalpy?

  8. Psychrometric Processes • What does sensible heating or cooling look like on the chart? • What does sensible mean? What does latent mean? • Why does some cooling cause dehumidification? • What does an evaporative cooling process look like on the chart? • When two air streams mix, how do you find the conditions for the new air stream?

  9. Heat Transfer • What defines a heat transfer though the wall? • What are air films and when do you include them in calculations? • What parameters do you need to know for determining the R-value of an airspace? • When do you use R-values and when do you use U-values?

  10. Heating and Cooling Loads • What are the major components of a heating load? • What is the difference for a cooling load calculation? • How do you account for heating and cooling loads associated with windows? • With infiltration? • Why are internal gains and solar gains most relevant for cooling loads?

  11. Heating systems • What is difference between furnace and boiler? • What are advantages of water as a heat transfer fluid? • Where do you get the input data? • Name fuels that can be used in a boiler?

  12. Cooling Systems • Basics components • Process in T-S diagram • What happens to water vapor in an evaporator? • Does an evaporator have a sensible and a latent capacity? • Does a condenser?

  13. Ventilation Systems • What are the components of AHU? • Which are the major ventilation systems? • Show Air-Conditioning in psychrometric chart. • When to use combination of air and water systems.

  14. Integrate Everything in Psychrometric Chart

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