Objectives

• Review/Learn about HVAC Configurations Describing systems and processes in the psychrometric chart

• Analyze processes in AHU and buildings– Finish examples from the text book

Single zone CAV

Single zone multi-room CAV

Multi zone CAV with Reheater

Duct reheat unit

Multizone CAV Dual Duct System

Dual duct terminal (Mixing box)

Single zone VAV

Multi zone VAV

VAV box

Multi zone VAV with Reheater

CAV Dedicated Outdoor Air System (DOAS)

with Fan Coil Units

100%OA Exhaust

Fan coil units for heating and cooling

For ventilation and humidity control

Fan Coil Units

Fan coil Units can be combined with mechanical ventilation or rely on infiltration

VAV Dedicated Outdoor Air System (DOAS)

with occupancy sensors

100%OA Exhaust

Fan coil units for heating and cooling

For ventilation and humidity control

VAV box VAV box

CO2 CO2

Fan Terminal Units Same as fan coil

Can be with or without recirculation

HVAC Systems

Single zone Multi zone

VAVCAV VAV CAVAll Hydroinicthat relay on infiltration

With and without reheaters

DOAS with fan coils

With reheaters

Dual duct

Dual duct DOAS with

fan coils

With and without humiditycontrol

This is not the complete list !

Single-Zone Systems

• Zone – any space with a thermostat

Air conditioning

Recirculation

Reheat

Evaporative Cooler

Air-to-air heat exchanger

Heart recovery by Air-to-air and air-water-air heat exchanger

Summary of HVAC Systems

• Show HVAC processes on a psychrometric chart

• Draw condition lines– Define sensible heat ratio

• Draw HVAC processes for real buildings– Single zone– Multiple zone

Reading assignmentsrelated to the HVAC systems

Chapters 7 & 8and

Handout Section on the course website