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Course code:
wb4426
Course name: Indoor Climate Control
Fundamentals
ECTS credit
points:
3
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Faculty
of 3mE
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Lecturer(s):
Prof dr ir A.H.C. van Paassen
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Tel:
015 278 66 75
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Catalogue data:
indoor climate; Mollier diagram of humid air, thermal
comfort, outdoor climate, heating and cooling load, simulation models, thermal
behaviour of buildings, installations and their capacities, ducts for air
transport, air movement in confined spaces (simple calculations and computer
fluid dynamics programs).
Two extended examples of exercises.
Similar assignments should be made by the student to be discussed during the
oral exam.
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Course year: 4
Period: 4/0/0/0
Hours per week:
4
Other hours: -
Assessment: oral
Assessm. Period: not fixed
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Prerequisites: -
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Follow up:
wb1224
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Detailed description of
topics:
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Introduction
to give a overview of indoor climate technology
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Historical
overview of the developments in this field.
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Thermodynamic
properties of humid air and the way changes of air condition can be
realised and demonstrated in the Mollier diagram. Different processes of
air handling are explained by this diagram.
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Thermal
comfort of human beings is made clear by mathematical models based on
heat and mass balances. Regions of comfortable values of indoor
temperature, radiant temperature, air speed and humidity are given. The
fuzzy aspect of comfort is made clear.
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Physical
properties of weather variables having an effect on the indoor climate
are discussed. Also its stochastic character is shown. It is
demonstrated how hourly weather data of different locations can be
generated by a stochastic model. It is made clear how these data can be
used to define the capacity and energy use of climate installations.
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Thermal
behaviour of buildings and the way it can be simulated by heat
balances. It is discussed how
such a simulation can be set up. An example of a simple standard room is
given. Based on this example the student should make a dynamic
simulation of another room and make a sensitivity analyses. Such as:
what is the impact of the seize of a window on the capacity of the
installation and its energy consumption. The simulation can be carried
out by Matlab, Simulink or Excel.
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Systems used in practice are shown. Pro
and contras are given.
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Attention is
given to design the duct for transporting the make up air from the
central air handling installation to the various room units. Noise and
energy use are important items. An example is given. It is the basis for
the second assignment that is focussed on sustainable design. At the
moment it is stated as: design
the ducting system appropriate for ventilating a three story high
building. In stead of a fan a solar chimney can be used to induce the
ventilation flow. Can it compete with a fan? How to be designed and
controlled?
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Methods to
predict the air flow patterns in a room are given. Especially the danger
of draft is taken into account. Also computer fluid dynamic computer (cfd)
codes are discussed briefly.
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Throughout the course exercises are
given to training the student.
Two assignments should be made and defended at the oral exam:
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Simulate the
dynamic thermal behaviour of a office room in order to define the
cooling capacity
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Design the
ventilation system of a small office building using a solar chimney.
Problems encountered by the students in making these assignments will
be discussed at regular moments during the course.
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Course material:
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Indoor
Climate Control Fundamentals. It can be downloaded from blackboard. Also
the original version in Dutch can be found on blackboard.
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Reference from literature:
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After each
chapter of the course material a literature list is given. It can be
used to get more information or to consult the original source. Moreover
these lists serve as a good example of good behaviour: always refer to
your sources!
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Remarks (specific
information about assessment, entry requirements, etc.):
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Learning goals:
The
student must be able to:
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derive the mathematical equations describing the thermal performance of
the various components
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combine these equations in order to simulate the whole system consisting
of the weather, building and installation
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use this tool to answer questions about the design, such as capacities,
energy use, comfort, etc.
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Give a historical overview to understand the impact of technology on the
way the indoor climate was controlled during the last 40 years
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determine the change of air conditions by the various components of an
air handing installation applying the knowledge obtained about the
thermodynamic aspects of humid air
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translate the fuzzy term “comfort” into design requirements that can be
checked afterwards by measurable variables and to describe the
limitations of this technical approach learning the theory about the
thermal sensation of human bodies
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calculate the heating and cooling capacity of a confined space by means
of simple hand calculation and by simulation, where the simulation is
based on statistical properties of the weather variables, thermal
response of the building on weather, people and machines and its ability
to accumulate heat
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present a review of modern computer codes based on computer fluid
dynamics, and predict the air flow patterns in a confined space using
standard formulas
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present the pro and contras of indoor climate systems used in practice,
as well as more sustainable alternatives including an indication of
their economics
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make optimal designs of simple systems based on simulation
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Computer use:
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Electronic
version of the Mollier diagram (can be downloaded)
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User
friendly design program Enerk can be used for a sensitivity analyses of
climate systems (can be downloaded)
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Excel for
making the two assignments
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Laboratory project(s):
no. An
installation with climate room is used to demonstrate the the air
conditioning.
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Design content:
1) Making a simulation of a
conditioned room in order to make a sensitivity analyses (first assignment)
and
2) design a ventilation system of a small building using a solar
chimney (second assignment).
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Percentage of design:
40%.
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