Develop a preliminary work breakdown structure (WBS) for a small one-story commercial building to be constructed on the site of
an existing small-frame structure. It is 30 by 60 ft in plan (see illustration). The exterior and interior walls are of concrete block. The roof is constructed of bar joists covered with a steel roof deck, rigid insulation, and built-up roofing. The ceiling is pended acoustical tile. The floor is a concrete slab on grade with an asphalt tile finish. Interior finish on all walls is paint. a) Show the first level of this structure for the total project (WBS is developed from top to the bottom). b) Select one work package (or building system) of the first level and develop the second- level structure for this work package. Heat and mechanical Lavatory Storage
2 answers:
Answer:
The preliminary work breakdown structure will be divided into two steps, the first is to draw the first level and the second is to draw the second level.
Explanation:
Please look at attachment.
Answer:
Answer is explained below.
Explanation:
Draw the first level of preliminary WBS for building the small one story commercial building as shown below.
See image 1
Site preparation:
It involves the demolition or cureacking of buildings and other structures clearing of building sites and sale of materials from demolished strictures.
Mechanical System:
It is a system with moving parts. anything with moving parts can be considered as mechanical system.
Building Walls:
Wall is a structure that defines an area, carries load, provide shelter , sound proofing or is decorative.
Electrical system:
Electrical system are a group of electrical components connected to carry out some operation . often-the system are combined with other systems.
B) Draw the second level WBS system as shown below.
See image 2
Plumbing:
It is a system that provides fluid for a wide range of applications . plumbing uses pipes, valves, tanks and other apparatus to carry fluids.
Air heating System:
This can be made cost effective by combining with ventilation system.
Water Heating:
It is a heat transfer process that uses an energy source to heat water above its initial temperature.
Air conditioning:
Air conditioning is the process of removing heat and moisture from the interior of and occupied space to improve the comfort of residents.
Ventilation system:
It is intentional introduction of outside air into space and is mainly used to control indoor air quality by by diluting and displacing indoor pollutants.
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Answer:
See explanation for step by step procedure to get answer.
Explanation:
Given that:
The conveyor belt is moving downward at 4 m>s. If the coefficient of static friction between the conveyor and the 15-kg package B is ms = 0.8, determine the shortest time the belt can stop so that the package does not slide on the belt.
See the attachments for complete steps to get answer.
Answer:
A) condenser pressure = 9.73 kPa,
B) 10242 kw
C) 36.9%
Explanation:
given data
entrance pressure of steam = 12.5 MPa
temperature of steam = 550⁰c
flow rate of steam = 7.7 kg/s
outer pressure = 2 MPa
reheated steam temperature = 450⁰c
isentropic efficiency of turbine( nt ) = 85% = 0.85
isentropic efficiency of pump = 90% = 0.90
From steam tables
at 12.5 MPa and 550⁰c ; h3 = 3476.5 kJ/kg, S3 = 6.6317 kJ/kgK
also for an Isentropic expansion
S4s = S3 .
therefore when S4s = 6.6317 kJ/kg and P4 = 2 MPa
h4s = 2948.1 kJ/kg
nt = 0.85
nt (0.85) = =
making h4 subject of the equation
h4 = 3476.5 - 0.85 (3476.5 - 2948.1)
h4 = 3027.3 kj/kg
at P5 = 2 MPa and T5 = 450⁰c
h5 = 3358.2 kj/kg, s5 = 7.2815 kj/kgk
at P6 , x6 = 0.95 and s5 = s6
using nt = 0.85 we can calculate for h6 and h6s
from the chart attached below we can see that
p6 = 9.73 kPa, h6 = 2463.3 kj/kg
B) the net power output
solution is attached below
c) thermal efficiency
thermal efficiency = 1 - = 1 - ( 2273.7/ 3603.8) = 36.9% ≈ 37%
