For a residential building with 5000W of heating demand, estimate:
a) the number of required vertical ground heat exchangers (borehole heat exchangers) to fulfill the heating demand (round up the number).
b) the heat exchange rate for each ground heat exchanger if boreholes are 30m deep (W/m).
Design parameters and assumptions:
The circulating fluid in the pipes is water with a temperature difference of 5°C between inlet and outlet pipes (T_{out} - T_{in}= 5°C) and Reynolds number of 5,000. Pipe outer diameter is 25mm with 1.8mm wall thickness. Circulating fluid density is 1000 kg/m^{3}, the heat capacity is 4180 J/(kgK) and dynamic viscosity of 0.001 Pa.s.
In: Civil Engineering
A long footing supports a wall carrying a load of 260
kN per m. The soil at the
site is saturated clay having a undrained shear strength of 117
kPa. The unit
weight of the clay is 22 kN/m³ and it is suspected that
occasionally the water
table rises to the ground surface. What width in m (1 dp) of
footing should be
used if a minimum factor of safety of 2.4 is required? The footing
depth is 1.2 m
In: Civil Engineering
For a trapezoidal-shaped, concrete-finished gravel bottom
channel along a 0.5% slope, with a bottom width of 8 feet, a top
width of 32 feet, and side slopes of 4:1, calculate:
a. the channel’s full capacity discharge,
b. velocity at full capacity discharge, and
c. discharge and velocity when stream flow is 0.5 feet from the top
of the channel.
In: Civil Engineering
In: Civil Engineering
A prototype torpedo 6m long travels at 35 knots well below the ocean surface at 20°C. A model is to be tested in a wind tunnel 15°C air. What should the velocity, in m/s, of the model be avoid compression effects?
In: Civil Engineering
In a soil investigation for a construction project, two soil types were identified with the following parameters (g = 9.81 m/s^{2}):
Soil Type |
Depth below ground level (m) |
Unit weights (kN/m^{3}) |
Other parameters |
Soil 1 (sand) |
6.5 |
g = 17 and g_{sat} = 17.5 |
E =15000 kN/m^{2} |
Soil 2 (overconsolidated clay) |
11.5 |
g_{sat} = 20 |
e_{0}=0.69, C_{c}=0.25, C_{s}=0.05 |
If the ground water level is at 2.5 m below the ground level, and the initial void ratio of the overconsolidated clay layer is 0.69, find the expected settlement in the clay layer only due to a proposed foundation that should imposes a pressure of 60 kN/m^{2} on the mid-depth of the clay layer. The overconsolidation pressure is 125 kN/m^{2}. What is the the total settlement due to both the sand and clay layers (to the mid-height of the clay layer)?
In: Civil Engineering
In: Civil Engineering
Could someone give me an example of how to find net uplift wind pressure on a wall or gable roof?
In: Civil Engineering
Toronto City Council is about to make a (another?) decision on the future of the Gardiner
Expressway, Eastern Section (From Jarvis Street to the Don River and Don Valley Expressway).
As a CONSTRUCTION MANAGER you are required to prepare a PRELIMINARY RISK
ANALYSIS for
the options that are being considered
2: Eliminate the expressway and create a new, wider road at ground
i need risk analysis table and executive summary
my subject is Risk management
In: Civil Engineering
Jakes on the Water is planning to expand their restaurant to a larger restaurant called Jakes on the Bay. The existing septic tank has a volume of 5.0 m3 and the existing tile field has a trench area of 200.0 m2 . If the anticipated wastewater production from the Jakes on the Bay is 4,000 L/d, will they have to expand either the septic tank or the tile field or both? Assume the soil is sandy loam.
In: Civil Engineering
In: Civil Engineering
Provide 3 types of construction permits may be required in a construction project and elaborate on their impact on the construction schedule.
In: Civil Engineering
what is the primary difference between a forced air system that provides both heating and cooling, and one that just provides heating?
In: Civil Engineering
In: Civil Engineering
A rectangular channel 10m wide carries a discharge of 40m3 /s. If at a section in this channel the depth is 1.5m, how far (upstream or downstream) from this section will the depth be 2.0m.Take So=0.00009and manning’s constant n=0.017.
In: Civil Engineering