Class notes
Thermodynamics - Reheat Rankine Cycle - Two stage
- Course
- Institution
Thermodynamics - Reheat Rankine Cycle - Two stage
[Show more]
Seller
Follow
josealfonso
Content preview
Jose Alfonso F. FabeBSME 2 – Thermodynamics 2
Level 5: Reheat Rankine Cycle with two-stage reheat
A two-stage reheat cycle was implemented for a power plant. Steam from the boiler has a pressure
of 9.0 MPa and a temperature of 400℃. The first reheater has a pressure of 4.0 MPa and a
temperature 400℃. The second reheater has a pressure of 1.4 MPa and 350℃ of temperature. The
𝑘𝑔
condenser pressure is at 30 kPa. For a mass flow rate of 3 , calculate the following: steam rate,
𝑠
turbine work, pump work, heat added in the boiler, heat added in the reheater, total heat added to
the cycle, total heat rejected by the condenser, power output of the cycle, net heat, and the thermal
efficiency.
Solution:
, At State 1:
𝑝1 = 9.0𝑀𝑃𝑎
𝑡1 = 400℃
From table 2.
𝑡𝑠𝑎𝑡 @ 9.0𝑀𝑃𝑎 = 303.40℃
Since, 𝑡1 > 𝑡𝑠𝑎𝑡 , then, it is in superheated steam state.
From table 3.
𝑘𝐽
ℎ1 = 3,117.8
𝑘𝑔
𝑘𝐽
𝑠1 = 6.2854
𝑘𝑔 ∙ 𝐾
At State 2:
𝑝2 = 𝑝3 = 4.0𝑀𝑃𝑎
𝑘𝐽
𝑠2 = 𝑠1 = 6.2854
𝑘𝑔 ∙ 𝐾
From table 2 @ 4.0MPa
𝑘𝐽
𝑠𝑔 = 6.0701
𝑘𝑔 ∙ 𝐾
𝑠𝑔 < 𝑠2, then, it is in superheated steam state.
From table 3@ 4.0MPa
We will solve enthalpy in state 2 by using linear interpolation.
Entropy Enthalpy
𝑘𝐽 𝑘𝐽
6.2842 2,917.0
𝑘𝑔 ∙ 𝐾 𝑘𝑔
𝑘𝐽 ℎ2
6.2854
𝑘𝑔 ∙ 𝐾
𝑘𝐽 𝑘𝐽
6.3108 2,931.9
𝑘𝑔 ∙ 𝐾 𝑘𝑔
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller josealfonso. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $5.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75057 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now