# POL200Y1 Lecture Notes - Lecture 2: Pennsylvania Plaza, Autotransformer, Thermal Engineering

6 views25 pages

Report of Group #________

Technical Content (90%)

____/10 Abstract - Does the abstract state the principal objectives and scope of the lab

assignment, describe the methods employed, summarize the important results, and state the

principal conclusions? Does the abstract stand on its own (i.e., not reference figures, tables,

equation numbers in the report)? Is the organization logical, and understandable to a reader (from

outside this course)?

____/5 Data Collection - Has the experiment been properly conducted and has the data

been accurately gathered? Was the correct procedure followed and was all required data (Gage

Pressures, temperatures, barometric pressure, flowrates, power input) collected and reported in

the report?

____/45 Theoretical Analysis and Calculations- Is the first law model carefully developed

for each component in the cycle (with proper assumptions stated) and was it correctly applied to

each component using the proper reference state numbers? Was the mass flowrate of the

refrigerant determined correctly? Was the First law properly applied to the valve to relate

enthalpy the inlet and exit enthalpies to each other? Is the First law properly applied to the

evaporator, condenser and compressor to determine their respective rates of heat transfer? Were

the calculations of the coefficient of performance (COP) and the capacity of the system done

correctly (using the correct rate of heat transfer)? Were the rates of heat transfer on the water

side of the heat exchangers done correctly? Were the enthalpies at the various states determined

correctly using the property tables? Were absolute pressures used when using the property

tables? Were the calculations and unit conversions done correctly? Does the theory section

follow the required guidelines (figure, equation numbers, definition of variables, transition

sentences, etc.)?

____/7 Tabular results – Is all of the collected and calculated data properly presented in

tabular form? Are there any errors in the data reduction (calculation errors)? Has the data been

clearly presented? Were the gage and absolute pressures tabulated, along with the collected

temperatures, flowrates and recorded power input values? Were the enthalpies at the refrigerant

reference states tabulated? Were the mass flowrates tabulated? Do the tables adhere to the

required formatting guidelines?

____/8 Graph – Is the pressure versus enthalpy diagram properly plotted? Was saturated

liquid and saturated vapor data from the textbook used to plot the saturated liquid and saturated

vapor lines? Were the refrigerant state points and the process lines superimposed on the same

graph and labeled? Does the graph include descriptive titles, axes labels, legends and are all

symbols or lines identified? Does the graph adhere to the required formatting guidelines?

____/8 Discussion - Does the discussion section clearly summarize and discuss the

important results, trends and conclusions? Does it address all the questions posed in the lab

assignment? Does it comment on changes in pressure and temperature between the various states

and the relative magnitudes of the rates of heat transfer and power input? Were the heat

exchanger rates of heat transfer on the refrigerant and water sides compared to each other? Are

any comments made about the P-h diagram? Were any observations made about the conduct of

the experiment or any problems encountered? Does this section adhere to the guidelines?

____/3 References - Are references (for the tables) included and properly cited in the

report according the guidelines stated in the lab report guidelines?

____/4 Appendix - Are the original raw data sheet and the lab handout included? Is a

copy of the Armfield software graph included to show that the system reached steady state?

Presentation (10%)

____/5 Is everything spelled correctly? Are there errors in grammar or punctuation?

____/5 Is the document neat and attractive? Is a consistent format used for text and

figures been used throughout the report?

____/100 TOTAL

Grader Comments are in the report.

Refrigeration/Air Conditioning System

EGR 2500

Laboratory Assignment #4

November 16, 2018

Prepared for:

Dr. K. Kobus

Submitted by:

Abstract

The objective of this lab assignment was to observe and analyze data pulled from a controlled

refrigeration system. The system used is an Armfield RA1-MKII Refrigeration/Air-Conditioning

Learning System. The temperature and pressure of the refrigerant in the system was measured at

various points throughout the system and other values such as work input and enthalpy were

calculated from the collected data. The refrigeration system was connected to a PC so that we

could easily adjust settings and measure the data required. Once we had collected the data

required, we used the formula for conservation of energy in order to model different

thermodynamic properties of the refrigerant and the system itself including heat transfers and

work. Data was then plotted in order to showcase trends from our collected data and the

properties of the materials utilized. Near the end of the lab, calculations were made for multiple

heat transfer rates throughout the system, and system efficiency. Questions concerning different

aspects of refrigeration in general and also our experiment in specific were answered as well.

Results