Heat Loss Calculator for a Stainless Steel Complex Pipe System

Heat Loss Calculator for a Stainless Steel Complex Pipe System

Heat Loss Calculator for a Stainless Steel Complex Pipe System By: Thomas Morris & Jacob Hannon The Problem Background We work at a Research and Development company that designs various hot fluid systems. Systems are on machines that are subject to wind and

cold weather. The systems have heat exchangers with known temperature inputs, and then long complex arrangements of stainless steel pipe to deliver the hot water. Each prototype is costly to build and test. We need a way of estimating the temperature and pressure loss in a system before building a prototype.

Objective Determine the final temperature and pressure loss. Determine if the losses are significant if the wind is blowing and for different outside temperatures. Setup of Heat Transfer Problem

Partial Continuation 1 Partial Continuation 2 Initial Conditions Excel Spread Sheet Solution All calculations including property interpolations are self contained

Perform iterations without switching between a property tables calculator Could easily be adaptable for other fluids than water or other pipe materials. Excel Spread Sheet Link Summary of results pertaining to

initial conditions Only required one iteration to decrease error Change in temperature lower than expected Pressure loss seems appropriate Internal flow was

turbulent Changing wind speed had little effect Radiation had a small to negligible effect Conclusions

Small temperature change due to these factors

Large internal heat transfer coefficient (116449.3 W/m^2*K) is 1047.4 times bigger than the small external heat transfer coefficient (111.179 W/m^2*K) Small diameter pipe (13.7 mm)=small surface area thus the heat rate between the pipe and the air was very small The pipe actually stored most of the energy. During an experiment the pipe changed color validating

this result. Changing Wind Speed only changed output temperature a few degrees because the external heat transfer coefficient did not change enough to have significant effect. The Pressure Drop seemed appropriate for the length, diameter, and relative roughness. Experiment was performed using very cold outside temperatures and a high temperature loss was expected. The results do not support this hypothesis and in fact show that on a hot day the losses could be even smaller/negligable. We anticipated the need to insulate the pipe but according to the results this is not

necessary. Under 140 mph hurricane winds there was only a 11.8 degree change (Due again to previously stated conlusions) Significantly increasing the length adds surface area and can make a huge difference in the temperature loss. For example with a 105.4 m pipe the delta T was 76.6 degrees. A lot of factors not investigated here can also affect the result (ie mass flow rate, pipe diameter, thickness, etc.) and using this spreadsheet will help determine the optimal configuration for any future fluid system.

Appendix Property tables were entered into the spreadsheet from Fundamentals of Heat and Mass Transfer 6th edition by Incropera, Dewitt, Bergmann, and Lavine Copywright 2007 John Wiley and Sons Equations used also from the same source

Recently Viewed Presentations

  • Walsh Bay Arts Precinct Vision Report Presentation Prepared

    Walsh Bay Arts Precinct Vision Report Presentation Prepared

    The concrete areas surrounding the piers are seen as cold and harsh and do not offer amenity for spending time, especially in hot summer months or rainy weather. Safety for children around water and roads. Some users reported that most...
  • Field and Natural Experiments - Duke University

    Field and Natural Experiments - Duke University

    Research Design: Find a natural experiment in Copenhagen, Denmark, where 4 out of 15 districts carried out a pilot project on decentralization (PCD) before a vote on whether to decentralize Typical Format Researcher manipulates something in the real world, exposing...
  • Rico Clusters vs. Mind Mapping Smackdown Steve Anderson,

    Rico Clusters vs. Mind Mapping Smackdown Steve Anderson,

    Temptation to back into the storyboard by writing or cutting and pasting first! Can become redundant and lacks creativity. Hard to translate from storyboard to proposal section. ... Use graphical techniques to capture ideas in a non-linear fashion.
  • Global Observations from PHOBOS - Mark D. Baker (BNL)

    Global Observations from PHOBOS - Mark D. Baker (BNL)

    April 2001 Mark D. Baker Essential Measurements to be made at RHIC using the PHOBOS Detector Mark D. Baker Brookhaven National Laboratory for the PHOBOS Experiment Collaboration (Oct. 2004) Results from dAu - an update Results from dAu - an...
  • Office 2007 PPTX Test Document

    Office 2007 PPTX Test Document

    JoAnne Rogers. 10. ADMINISTRATION - PERFORMANCE TO DATE. ADMINISTRATION - PERFORMANCE TO DATE. DEPARTMENT GOALS. ... Nate Platt. 15. IT GROUP - PERFORMANCE TO DATE. IT GROUP - PERFORMANCE TO DATE. DEPARTMENT GOALS. 3.1.1 Grow average monthly licenses by 40%...
  • Realistic Conflict Theory - WordPress.com

    Realistic Conflict Theory - WordPress.com

    Realistic Conflict Theory Mustafer Sherif ... The Robbers Cave Experiment Muzafer Sherif divided a Boy Scout camp into two groups, the Eagles and the Rattlers. After helping the groups to each become cohesive, he introduced competitive games and other conflicts....
  • These materials were produced with Title I, Part

    These materials were produced with Title I, Part

    Session Description. In this session, participants will expand upon their work in the Safety Net from the Mechanical Level. This session will focus on Floor 2 of the Instructional Infrastructure where the visions are brought to life in the classroom...
  • Gaius Julius Caesar Caesar had more than a

    Gaius Julius Caesar Caesar had more than a

    Ptolomy, weighted by his armor of gold, drowned in the River Nile Cleopatra's third brother Ptolomy XIV becomes joint ruler Julius and Cleopatra Julius Caesar had Cleopatra restored to the throne of Egypt Cleopatra became Caesar's mistress Cleopatra's son Caesarean...