Hotel Engineering Training HVAC System

. – – Tel: (62) 361 7910518 Fax: (62) 361 7910518

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Drs. Agustinus Agus Purwanto, MM

Thermal Comfort 

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Balancing heat produced by one’s body with surroun ng env ronment. Body heat lost by convection, radiation, and evapora on

Factors that influence comfort     

indoor temperature humidity air movement room surface temperatures overall air quality

Comfort zone 

Insert comfort zone chart

Heat sources 

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Electricity– Electricit y– Used in all all electric electric heaters. heaters. Requires Requires no no . . Natural Natu ral gas – Clean burnin burning. g. Flue requi required. red. Very Very efficient. Delivered via underground pipe que e petro eum – re at ve y c ean urn ng. equ res on-site storage tank. Delivered via truck. Fue uell oil oil – te ten ndenc to cre rea ate dir irt/ t/sm smo oke. Re uir ires es onsite storage tank. Delivered via truck. Various grades available.  –  from local utility or in large complexes with central steam plant. Supply and return lines required.

Heating equipment  

Furnaces and Boilers om ust on e c ency

Flue Furnace

Heat Exchanger

Cooling Systems 

Boyles Ideal Gas Law  –   –   – 

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ressure Temperature Volume

Certain gases react more actively  –   –   – 

CFC’s HCFC’s

The Refrigeration Cycle Compressor

Evaporator Coil on enser

Expansion Valve/ Metering Device

o

oo ng system operat ng an maintenance concerns 

Types of compressors  –   –   – 

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ec proca ng Centrifugal Rotary

Energy efficiency ratio (EER) Integrated part load values (IPLV) Environmental Environmen tal Protection Agency  –   – 

supervises aspects of refrigeration equipment maintenance im ortance of eliminatin or reducin refri erant leaks

oo ng system operat ng an maintenance concerns 

Types of compressors  –   –   – 

  

ec proca ng Centrifugal Rotary

Energy efficiency ratio (EER) Integrated part load values (IPLV) Environmental Environmen tal Protection Agency  –   – 

supervises aspects of refrigeration equipment maintenance im ortance of eliminatin or reducin refri erant leaks

HVAC system types 

Centralized systems; quiet  –   –   – 

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three-pipe four-pipe

Decentralized systems; not as quiet  – 

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wo-p pe

heating and cooling sources in guestroom itself or along

Hybrid systems  – 

characteristics of centralized and decentralized systems

ystem types an ma ntenance nee s o HVAC systems for other building areas 

Air handling units  – 

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ouse eep ng,

c en, ma n enance…

Packaged air conditioning units  – 

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so a on o zones

usua us uallll mo moun unte ted d on on roo rooff

Maintenance issues  – 

Filter replacement

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e c ec ng an rep acemen cleaning of fans and heat transfer surfaces

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HVAC controls  

Today’s controls are often electronic ermostat  –   – 

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enthalpy or economizer economizer control  —

Digital control systems  –   –   – 

varia vari able air vo volu lum me VAV s ste tems ms load sensing equipment EMS sensors

Cooling towers    

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Startup and shutdown concerns Inspection and lubrication of pumps and fans Removal of dirt and other debris Treatments to reduce bacteria, scale, and corrosion Inspection of metal surfaces