thermodynamics lab report - h111j unit

8/17/2019 Thermodynamics Lab Report - H111J Unit

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Lebanese International University

School of Engineering

Department of Mechanical EngineeringMENG320L—Thermodynamics Lab

Section ID:C

Experiment Code: TH2-1

Experiment Title:Boyle's Law Demonstration

Report No:2

Student Name !ader "#hdarStudent ID:11$10121 %arah %alha 11$302&

Lab Intructor:Hassan (aber

Date:

I. Objectives of the Experiment

The objective of the experiment was to investigate Boyle's aw! which in other

terms is the investigation of the relationship between press"re an# vol"me.


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II. Equipment used in this Experiment

1. Re# $pirit in %lass Thermometer.&. nit ()*).


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III. Description of the Apparatus

1. The ()*) nit consists of two chambers! the fl"i# chamber an# the meas"ringchamber! that are connecte# by a copper t"be an# flow control valve.

Figure 1. ()*) nit

&. The vol"me of mass of air is fixe# in the meas"ring chamber an# is increase#

or re#"ce# by "sing the oil in the fl"i# chamber.


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Figure 2. +eas"ring ,hamber Figure . Fl"i# ,hamber

3. The compressor either provi#es compresse# air to the fl"i# chamber via a

control valve an# #ischarge co"pling or it provi#es a so"rce of vac""m to the fl"i#chamber via the s"ction co"pling. They are connecte# to the fl"i# chamber thro"gh the

bl"e hose an# co"pling point.

Figure !. The compressor


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Figure ". The compressor's #ischarge -/ an# its s"ction co"pling -*/

$) The com*ressor is started and sto**ed by a main switch +o,nd on a

small electrical console that contains the *ower lead resid,al c,rrent circ,it

brea#er and *ress,re .a,.e) The *ress,re .a,.e reads the *ress,re in the

meas,rin. chamber)

Figure #. The electrical console

/) The .as ol,me in the meas,rin. ol,me is indicated by a scale

+o,nd on the .lass s,r+ace) The tem*erat,re is indicated by the red s*irit in

.lass thermometer)


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Figure $. Re# $pirit in glass thermometer

0. n or#er to assist in the operation of the "nit! the relief valve is constantly "se#

as a blow off point for the compressor.

Figure %. The relief valve -1/ an# press"re control valve -&/

!otes

- The deice will reset a,tomatically when the com*ressor oerheats

since the com*ressor is *rotected by a thermal switch which will disconnect

the electrical s,**ly at the com*ressor motor)

- The hi.h *ress,re c,t o,t switch is s,**osed to be o*eratin.

normally at 2)2 bar .a,.e and the relie+ ales are s,**osed to be ad,sted

below a *ress,re o+ 2)/ bar .a,.e)

- The ,id chamber sho,ldnt be 4lled aboe the ma5im,m 4ll indictor

line)

!"#

!$#


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I&. 'rocedure

1. ,onnect the compressor to the meas"ring chamber.&. T"rn on the compressor! 2eep it on till it rea#s 4) 256m&.

3. T"rn the compressor off.

. 7pen the flow valve "ntil it reaches 1* cm in the meas"ring chamber.

*. Relief the s"ction port an# ret"rn the chamber press"re to the ) 256m& ga"ge

press"re -atmospheric press"re/0. 8isconnect the compressor from the meas"ring chamber.

4. ,onnect the compressor to the fl"i# chamber.

9. 7pen the flow valve an# recor# the press"re every *cm of oil height change.


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&. (o))ected Data

*ab)e 1. 8ata collecte# from the experiment

Gauge %reure!&%a#

'il (eight !cm# Temperature !)C#

0 1/ 21

-$1 10 21

-60 / 21

-6& 0 21


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&I. (a)cu)ated +esu)ts ,if an-

*ab)e 2. ,alc"late# #ata from observe# #ata

Gauge%reure!*%a#

+bolute%reure!*%a#

'il (eight!cm#

'il,olume!L#

+ir,olume!L#

Temperature ! -C#

0 100 1/ 0)7/ 0)2/ 21

-$1 /& 10 0)/ 0)/ 21

-60 $0 / 0)2/ 0)7/ 21

-6& 31 0 0 1 21

*ab)e . :bsol"te press"re an# air vol"me relationship

+bolute%reure!*N.m"#

100 /& $0 31

+ir ,olume!mm/#

0)2/ 0)/ 0)7/ 1

Contant *!N0m#

2/ 2&)/ 30 31

8abs 9 8.a,.e : 8atm

;here


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@5am*le +or 8.a,.e 9 -$1 #8a

8abs9 A-$1:100 #8a

8abs9 /& #8a

oil 9 A hoil chamber ? hchamber

;here


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8abs air 9 #

;here


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&II. Data *reatment ,(a)cu)ations and tabu)ated data or/and

graphs

Graph $1 The inerse absol,te *ress,re-ol,me o+ air relationshi*

ol,me o+ air increases the inerse *ress,re also increases and it is a

strai.ht line since it is linear)

since as the


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&III. Discussion and (onc)usion

The obectie o+ this e5*eriment was eri4ed) Boyles law inesti.ates

the relationshi* between the *ress,re and ol,me o+ an ideal .as ,nder

constant tem*erat,re) The .ra*h is increasin. linearly which means that the

inerse absol,te *ress,re is directly *ro*ortional to the ol,me o+ air in other

words the absol,te *ress,re is inersely *ro*ortional to the ol,me o+ air

since its a strai.ht line the slo*e o+ this line acts as the # constant) There+ore

an e>,ation o+ 89# ,nder constant tem*erat,re is eri4ed) The inacc,racy

o+ the # constant was +o,nd it wasnt e>,al in all cases o+ 89# cases) This

error is related to the inacc,racy in readin. the obsered data or the

mal+,nctionin. o+ the H0/0 ,nit there+ore a small mar.in o+ diFerence

e5isted between the #s calc,lated) This sim,lation o+ Boyles Law e5*eriment

came to a concl,sion with the eri4cation o+ the law that ,nder constanttem*erat,re the ol,me and *ress,re o+ an ideal .as are inersely

*ro*ortional as the ol,me o+ air increased the absol,te *ress,re decreased)

thermodynamics lab report - h111j unit

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