1. October 31st In class test!
Course Test
October 31st
In class test!
Examples are posted on the course website

2. Project 1
Due date: October 31st

3. Modeling steps Define the domain Analyze the most important phenomena
and define the most important elements
Discretize the elements and
define the connection
Write energy and mass balance
equations
Solve the equations
Present the result
ES program
Preprocessor
Solver
Postprocessor

4. Characteristic parameters
Conduction (and accumulation) solution method
finite dif (explicit, implicit), response functions
Time steps
Meteorological data
Radiation and convection models (extern. & intern.)
Windows and shading
Infiltration models
Conduction to the ground
HVAC and control models

5. eQUEST (DOE2) US Department of Energy & California utility customers
eQUEST - interface for the DOE-2 solver
DOE-2 - one of the most widely used ES program
- recognized as the industry standard
eQUEST very user friendly interface
Good for life-cycle cost and parametric analyses
Not very large capabilities for modeling of different HVAC systems
Many simplified models
Certain limitations related to research application
- no capabilities for detailed modeling

6. eQUEST HVAC Models Predefined configuration (no change)
Divided according to the cooling and heating sources
Details in e quest help file:
For example:
DX CoilsNo Heating
Packaged Single Zone DX (no heating)
Packaged single zone air conditioner with no heating capacity, typically with ductwork.
Split System Single Zone DX (no heating)
Central single zone air conditioner with no heating, typically with ductwork. System has indoor fan and cooling coil and remote compressor/condensing unit.
Packaged Terminal AC (no heating)
Packaged terminal air conditioning unit with no heating and no ductwork. Unit may be window or through-wall mounted.
Packaged VAV (no heating)
DX CoilsFurnace
Packaged direct expansion cooling system with no heating capacity. System includes a variable volume, single duct fan/distribution system serving multiple zones each with it's own thermostatic control.
Packaged Single Zone DX with Furnace
Central packaged single zone air conditioner with combustion furnace, typically with ductwork.
Split System Single Zone DX with Furnace
Central single zone air conditioner with combustion furnace, typically with ductwork. System has indoor fan and cooling coil and remote compressor/condensing unit.
Packaged Multizone with Furnace
Packaged direct expansion cooling system with combustion furnace. System includes a constant volume fan/distribution system serving multiple zones, each with its own thermostat. Warm and cold air are mixed for each zone to meet thermostat control requirements.

7. Building HVAC Systems (Primary and Secondary Building Systems)
AHU – Air Handling Unit
Distribution
systems
Fresh air
For ventilation
AHU
Primary
systems
Air transport
Electricity
Secondary
systems
Cooling
(chiller)
Heating
(boilers)
Building
envelope
HVAC systems affect the energy efficiency of
the building as much as the building envelope
(or Gas)
Gas

8. Integration of HVAC and building physics models
Load System Plant model
Building
Qbuiolding
Heating/Cooling
System Q
including
Ventilation
and
Dehumidification
Plant
Integrated models
Building
Heating/Cooling
System
Plant