Announcements 1) Thursday 02/09 In class Midterm Exam - I will be in the classroom at 9:20 AM - Example and solution are posted on the course website 2) FIELD TRIP (HVAC systems) Tuesday 02/11 9:30AM - Neural and Molecular Science (NMS) - Meet in front of NMS building

Fieldtrip Neural and Molecular Science (NMS) building building at the corner of Speedway and Dean Keeton. Tuesday 02/11 at 9:30 AM at the door on Speedway side Do not arrive late !

Homework Assignment 4 Table 1 Results of cooling load calculation and required amount of fresh air for ventilation Zone 1 Zone 2Zone 3Whole building Sensible cooling load for zone Time when the max cooling load appear Btu/h at 4 PM Btu/h at 6 PM Btu/h at 8 AM Btu/h at 6 PM Sensible cooling load for critical hour for whole building (6 PM) Btu/h at 6 PM Btu/h at 6 PM 9000 Btu/h at 6 PM Latent cooling load (internal sources + infiltration) 5400 Btu/h5200 Btu/h5400 Btu/h16000 Btu/h Required amount of fresh air based on number of occupants 240 CFM (12 occupants) 520 CFM (26 occupants) 240 CFM (12 occupants) 1000 CFM (50 occupants)

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?

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?

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?

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?

Heating systems What is difference between furnace and boiler? What are advantages of water as a heat transfer fluid? What are the relevant equations for sizing steam and water pipes? Where do you get the input data? Name four fuels that can be used in a boiler? Which ones require venting?

Cooling Systems What are the differences between vapor compression and absorption cycles? What happens to water vapor in an evaporator? Does an evaporator have a sensible and a latent capacity? Does a condenser? How the heat pumps work?

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. Know the purpose and characteristics of duct system and fans. Know the purpose and characteristics of pipe system and pumps.

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

Project Assignment 1 Cover the previous course material Homeworks Reading assignments Similar to a real-world project Preparation for ARE 465 project

Project Assignment 1 Design the environmental system for large building Project that you will have next year Simplification (one zone for calculation) Show the logic for zoning Select the heating and cooling fuel Select the heating and cooling source Select and size the HVAC system Size the Cooling Coil and analyze the process in AHU

Project Assignment 1 4 Groups (teams) – 4 Different assignments Type of buildings –hospital (group 1) –campus building (group 2) –bank (group 3) –hotel (group 4) –shopping mall (group 5) Location of the building –Boston MA (group 1) –Chicago IL (group 2) –Iowa City IA (group 3) –Newark NJ (group 4) –Pittsburg (group 5)

Project Assignment 1 EVALUATION 90 points ~ 9% of your grade Second project assignment 60 points Each group project will be graded as integral work Group member effort and project grade will form your final grade on the project

Project Assignment 1 Project elements 1. Cooling and Heating load of building 2) Zoning 3) Heating and cooling source selection 4) HVAC system selection 5) Air handling Unit

Project Groups Total 5 ????

Project Assignment 1 Suggestions Divide the groups into 2 subgroups and split the work Subgroups should communicate Have one person in charge for the final project form Divide the project into 3-4 sections and each student will work on a small portion In the case that some student have a problem switch the tasks Meet at least twice to discus the progress One person will put together the whole project