Answer:
the rate of heat loss from the steam turbine is Q = 200 kW
Explanation:
From the first law of thermodynamics applied to open systems
Q-W₀ = F*(ΔH + ΔK + ΔV)
where
Q= heat loss
W₀= power generated by the turbine
F= mass flow
ΔH = enthalpy change
ΔK = kinetic energy change
ΔV = potencial energy change
If we neglect the changes in potential and kinetic energy compared with the change in enthalpy , then
Q-W₀ = F*ΔH
Q = F*ΔH+ W₀
replacing values
Q = F*ΔH+ W₀ = 420 kg/min * (-600 kJ/kg) * 1 min/60 s * 1 MW/1000 kW + 4 MW = -0.2 MW = -200 kW (negative sign comes from outflow of energy)
B. Always cut away from the body
ASHRAE Standard 15 - 1994 requires that each machinery room must activate an alarm and mechanical ventilation before refrigerant concentrations exceed the TLV-TWA (Threshold Limit Value - Time Weighted Average).
<h3>
What is ASHRAE Standard 15 - 1994?</h3>
- The key standards guiding refrigerant identification and usage developed by ASHRAE have been revised to comply with government regulations and achieve improved performance.
- Standards 15 and 34 provide critical guidance to manufacturers, design engineers, and operators who must stay up to date on new air conditioning and refrigeration requirements.
- Standard 34 describes a shorthand method of naming refrigerants and assigns safety classifications based on toxicity and flammability data, whereas Standard 15 establishes procedures for operating equipment and systems when those refrigerants are used.
- Before refrigerant concentrations exceed the TLV-TWA, each machinery room must activate an alarm and mechanical ventilation, according to ASHRAE Standard 15 - 1994 (Threshold Limit Value - Time Weighted Average).
Therefore, ASHRAE Standard 15 - 1994 requires that each machinery room must activate an alarm and mechanical ventilation before refrigerant concentrations exceed the TLV-TWA (Threshold Limit Value - Time Weighted Average).
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The correct question is given below:
ASHRAE Standard 15 - 1994 requires that each machinery room must activate an alarm and mechanical ventilation before refrigerant concentrations exceed:
The factors that you need to consider when preparing to move gondolas are:
<h3>How do you move a gondola?</h3>
In choosing gondola one need to look at some factor in decisions such as height.
Know that it is good to consider the construction material and also the center wall configuration for its building also.
The factors that you need to consider when preparing to move gondolas are:
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Answer:
E = 80.381 GPa
Explanation:
given,
Distance between two gauges, L = 320 mm
diameter,d = 12 mm
Load, P = 15 x 10³ N
distance between gauge marks = 320.5280 mm
Now, elongation of rod is equal to
δ = 320.5280 - 320 = 0.5280 mm
Using elongation formula
E = 80381.28 MPa
E = 80.381 x 10³ MPa
E = 80.381 GPa
Hence, Modulus of elasticity of the metal is equal to E = 80.381 GPa
