Scientific Principles 3
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Learning Outcome
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Learning Outcome
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Assessment Criteria
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In this assessment you will have the
opportunity to present evidence that shows you are able to:
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Task no.
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Evidence
(Page no)
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LO1
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Be able to determine heat energy
transfer rates
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1.1
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discuss the principles of heat
transfer
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1a
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1.2
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discuss the reliability of design criteria
for
maintaining thermal comfort
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1b
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1.3
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determine the risk of
interstitial condensation in
multi-leaf plane structures
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1c
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1.4
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determine heat energy transfer
rates by conduction, convection and radiation
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1d
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Scenario. The project manager of your company has
asked you to carry out an investigation into the methods of heat transfer in
buildings and the requirements of thermal comfort for the occupants. He also
needs to know the likelihood of interstitial condensation occurring in the
cavity walls.
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Task 1a. (LO1:
1.1 ) Discuss the principles of heat
transfer.
You
are required to carry out an investigation into the following methods of heat
transfer;
·
Conduction
·
Convection
·
Radiation
For
M1, You should demonstrate an effective approach to study and research and include
practical examples as well as any relevant theory.
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Task 1b. (LO1: 1.2 ) Discuss the design criteria for maintaining thermal
comfort
A company or organization must
consider the effect of thermal comfort on individuals who are in their care
or employment. In doing so, they must conform to BS EN ISO 773O, you are
required to examine the various factors involved in a designer paying heed to
these and Health & Safety Executive regulations. You should make
reference to industry standard indices in current use.
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Task 1c. (LO1: 1.3) Determine the risk of interstitial condensation in
multi-leaf plane structures.
As a result of your project manager’s
request concerning interstitial condensation in the cavity walls of you
company’s products, you will need to research information and data from
relevant sources as well as the course notes. A CIBSE psychometric chart is
provided for your use. The cavity wall consists of a 13 mm lightweight
plaster coat, a 100 mm concrete block, a 40 mm mineral fibre slab an air
space of 10 mm and 105 mm brickwork. The internal and external temperatures
are, X C and 0 C. respectively.
Internal and external percentage saturations are 50 and 100 % respectively.
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You need to calculate the dew point gradient for the
complete cavity wall.
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You should determine whether surface or interstitial
condensation will take place. This question will enable D3.4 to be awarded.
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Task 1d. (LO1. 1.4) Determine heat energy transfer
rates by conduction, convection and radiation.
You are required use your study
of the mechanisms of heat transfer, to solve some practical problems,
involving conduction, convection and radiation.
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In the first instance you need to calculate the U
value for a fully insulated cavity wall, using the proportional area method.
You should compare your findings with a U value calculator available on-
line.
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Using the U value calculator, determine the U value
for the same cavity wall with an air gap, compare and contrast your findings.
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A steam pipe without insulation passes through a
large factory, in which the air and factory walls are 20 C. The external
diameter of the pipe is 80 mm, its surface temperature is 220 C and it has an
emissivity of 0.75. If the coefficient associated with free convection heat
transfer from the surface to the air is 20 W/m2 K, what is the rate of heat
loss from the surface per unit length of pipe? This task will provide
evidence of M1.2.
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Criteria Reference
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To achieve the criteria the evidence must
show that the student is able to:
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Achieved?
(tick)
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LO 1
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1.1
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Discuss the
principles of heat transfer.
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1.2
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Discuss the design criteria for maintaining thermal
comfort
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1.3
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Determine the risk of interstitial condensation in
multi-leaf plane structures.
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1.4
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Determine heat energy transfer
rates by conduction, convection and radiation
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