Assignment 2 Cc608

7/17/2019 Assignment 2 Cc608

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ASSIGNMENT 2

QUESTION 1

Large building need to be demolished by machinery components because of few

factors The factors are!"

• To reduce the time needed to demolish a building

• To sa#e cost

• Only s$illed person will do demolishing wor$s

• %an reduced labor cost

QUESTION &

'(NU(L )E'OLITION E*+LOSION )E'OLITION

• )emolition process start from

the top of a building until the

ground

• ,efore demolishing- structure

of the bulding need to studied

to de#elop a blasting design• Use hand"held tools such as

.ac$ hammer

• Use dynamite

• )emolition wor$ assessed by

competent person

• )emolition wor$ assessed only

by e/pert

• Suitable only for small

buildings

• Suitable for multi"storeyed

buildings

• Ta$e long period to complete

demolition of a building

• Ta$e only few seconds to

demolish a building

QUESTION 0



1 %ompressor The purpose of the compressor is to draw the low"temperature- low"

pressure #apour form the e#aporator #ia the suction line Once drawn- the

#apour is compressed hen #apour is compressed- it rises in

temperature Therefore- the compressor transform the #apour from a low"

temperature #apour to a high"temperature #apour- in turn increasing the

pressure The #apour is then released from the compressor in to the

discharge line

& The e#aporator



The purpose of the e#aporator is to remo#ed unwanted heat from

the product- #ia the li2uid refrigerant The li2uid refrigerant contained

within the e#aporator is boiling at a low pressure The le#el of this

pressure is determined by two factors!"

" The rate in which heat is absorbed from the product to the li2uidrefrigerant in the e#aporator

" The rate in which the low"pressure #apour is remo#ed from the

e#aporator by the compressor

To enable the transfer of heat- the temperature of the li2uid

refrigerant must be lower than the temperature of the product being

cooled One transfered- the li2uid refrigerant is drawn from the e#aporator

by the compressor #ia the suction line hen lea#ing the e#aporator coil

the li2uid refrigerant is in #apour form



0 %ondenser

The purpose of condenser is to e/tract heat from the refrigerant to

the outside air Usually installed on the reinforced roof of the building-

which enables the transfer of heat 3ans mounted on the condensor units

are used to draw air through the condensor coils The temperature of thehigh"pressure #apour determines the temperature at which the

condensation begins (s heat has to flow from the condenser to the air- the

condensation temperature must be higher than that of the air- usually

between 1&4c to "14c The high"pressure #apour within the condenser is

then cooled to the point where it becomes a li2uid refrigerant once more-

whilst retaining some heat The li2uid refrigerant then flows from the

condenser in to the li2uid line



5 E/pansion 6al#e

Located at the end of li2uid line- before the e#aporator The high"

pressure li2uid reaches the e/pansion #al#e- ha#ing come from the

condenser The #al#e then reduce the pressure of the refrigerant as it

passes through the office- which is located inside the #al#e On reducingthe pressure- the temperature of the refrigerant also decreases to a le#el

below the surrounding air This low"pressure- low temperature li2uid is

then pumped in to the e#aporator

QUESTION 5



3actor that affect escalator design !

(i) Physical requirement

The #ertical and hori7ontal distanced to be spanned must be considered

These factors will determine the length and pitch of the escalator The

building infrastructure must be able to support the hea#y components

(ii) Location

The escalator should be located where it can be easily seen by the general

public In department stores- customers should be able to #iew the

merchandise easily In addition- up and down escalotor trafficshould be

physically seperated and should not lead onto confines spaces

(iii) Traffic pattern

The traffic pattern should be also be anticipated In some buildings- the

ob.ecti#e is simply to mo#e people from one floor to another- but in others

there may be a more specific re2uirement- such as funneling #isitors

towards a main e/it or e/hibit The escalator- must be design to carry

there2uired number of passengers

(i) Safety consi!eration

Escalators are re2uired to ha#e mo#ing handrails that $eep pace with the

mo#ement og the steps This helps riders steady themsel#es- especially

when stepping onto the mo#ing stairs Occasionally- a handrail will mo#e

at slightly different speed from the step- causing it to 8creep9 slowlyforward or bac$ward relati#e to the steps The lose of the synchroni7ation

between handrail and step speed can result from slippage and wear

() Aesthetic preferences

The architects and designers can choose from a wide range of styles and

colors for the handrails and tinted side panels

Documents

Assignment 2 Cc608