Consider   a   vapour   compression   refrigeration   cycle   that   uses   R-134a   as   refrigerant.   The   R-134a   enters   the   compressor   as   a   saturated   vapour   at   200   kPa,   and   exits   the   condenser   as   a   saturated   liquid   at   900   kPa.   The   rate   of   refrigeration   of   the   cycle   is   to   be   6.0   tons   of   refrigeration   (1   ton   of   refrigeration   =   3.517   kW).   The   compressor   isentropic   efficiency   is   80%.   Determine:   a) The   temperature   of   evaporation   and   condensation   of   the   refrigerant;   b) Mass   flow   of   the   refrigerant   R-134a,   in   kg/min;   c) Coefficient   of   Performance   (COP)   of   the   refrigeration   cycle.   Typical   vapour   compression   refrigeration   systems   use   a   throttling   valve   (or   an   orifice   tube,   or   a   capillary   tube)   to   reduce   the   liquid   refrigerant’s   pressure.   This   is   a   highly   irreversible   process.   If   the   cycle   efficiency   is   to   be   improved   by   replacing   the   throttle   with   a   rotary   expander   with   70%   isentropic   efficiency,       d) What   is   the   new   COP?   The   expander   delivers   its   work   developed   to   the   compressor.  
  

• Plan and write a 4-or 5-paragraph problem/solution essay, including
• A clear outline with emphasis on a focused and specific thesis statement and a topic sentence for each paragraph
• Describe a problem and suggest 2 solutions (in 2 paragraphs) to overcome it
• it is an assignment for general English It is better if the subject is outside of engineering. I asked for help in the wrong field because I want to get the full degree and I have a study for the test and I do not have time to do it myself

A field test is conducted in a confined aquifer by pumping a constant discharge of 14.9 m³/hr from 20-cm-diameter well. After an approximate steady state is reached, a drawdown of 0.98 m is measured in the pumped well. Also measured are drawdowns of 0.73 m, 0.65 m, 0.60 m, and0.57 m, respectively, at 8.0 m, 30.0 m, 80.0 m, and 132 m from the pumped well. Determine the transmissivity of this aquifer. Also, determine how far away from the well you must be before the drawdown becomes less than 0.45 m.

Explain, with reasons, whether you can use the following tests to simulate the behavior of sand in liquefaction

i) Unconsolidated Undrained Triaxial Test

ii) Direct Shear Test

iii) What is the most suitable type of triaxial test that should be used? (Does not have to be (i) or (ii))

QUESTIONS:

Design a square column footing for a 20-in. square tied interior column that supports loads of DL (170) k and Live load LL (210) k. The column is reinforced with eight No 8 bars, the bottom of the footing is 5 foot below final grade, and the soil weighs 100 lb. /ft3 the allowable soil pressure is 4 w ksf. The concrete strength is 4,000 psi and the steel is Grade 60.

Environmental lapse rate = 0.1 degree C/100m upto 100 m altitude (surface temperature drop at nighttime).

Environmental lapse rate = -0.7 degree C/100m after 100 m altitude

The adiabatic lapse rate is based on moist air.

Find the atmospheric condition from the example below.

a) Mixed radiational inversion

b) Radiational inversion

c) Subsidentail inversion

d) Frontal inversion

e) Advective inversion

Will upvote, thanks in advance

A Class I two-lane highway is on level terrain with passing permitted throughout. The highway has 3.6 m lanes with 1.1 m shoulders. There are 13 access points per kilometer. The base FFS is 96.5 km/hr. During the peak hour, 500 vehicles are traveling in the analysis direction and 400 vehicles are traveling in the opposing direction. If the PHF is 0.8 and there are 7% large trucks, 7% buses, and 7% recreational vehicles, what is the level of service?

The rate of change of the grade of a parabolic summit curve is 0.5%. The grade of ascending and descending tangents are 6% and -2.0% respectively. The elevation of VPT is 200 ft at Sta 15+80. Determine the:

a) length of curve;

b) elevation of the summit,

c) location of the summit;

d) the vertical distance from VPI to the curve;

e) elevation at Sta 06+80.

Give reason:

why when velocity across a pipe fitting increases the pressure drop also increases.

For a coastal area, you are asked as the responsible sanitary engineer to design a waste treatment plant. Briefly select the following and give a sound engineering justification: Effluent treatment train, Sludge treatment train, Effluent reuse/recycle/reclamation or ultimate disposal, Treated sludge usage or final disposal, Location of your suggested wastewater treatment plant, and Methods to be used for unit engineering design

please solve this question with a clear hand writing

A speed field; It is defined by V(u,v)=(V1/L)(-xi+yj) , here V1 and L are fixed. This flow is 2 dimensional and stable.

(a)In which position in the flow area does the velocity equal the velocity V1? Make an outline of the speed field by drawing arrows for x>=0 , these arrows should represent fluid velocity in representative positions.

(b)Draw the flow line. (dx/u=dy/v)

Design a space within a building (could be one room) indicating the interior thermal
mass and construction. The design should illustrate the best location for thermal mass
and window placement in order to improve indoor comfort and building's thermal
performance.

design a RCC beam as per aci 318 2014
f'c = 32 N/mm^2
fy=400 N/mm^2
live load acting =10 KN/m
span=6 m
do all checks including check for minimum area of rebar
clearly mention all assumption and clause of code used(compulsory)

2) calculate cracking moment for the section

aci 318 pls

Operating problems and solutions that will occur in the waste water treatment facility.

(at least 4 problems and these solutions)

#Environmental Engineering