ARCHITECTURAL SERVICES

PACKAGED AIR CONDITIONERS

GROUP MEMBERS-BHAVYA SHARMAVIKRAM SOLANKISAKSHI SRIVASTAVAANUBAHV GUPTAANIRUDHA PRASAD

PACKAGE AIR CONDITIONER Package ac is a bigger version of the

window air conditioner. It has a higher cooling or heating

capacity and is usually able to cool an entire house or commercial building.

The nominal capacities ranges from 3 tonne to 15 tonne.

it also has 2 units: indoor unit and outdoor unit.

COMPONENTS This self contained unit is assembled in

a casing where all the air conditioning components are housed. They include:

Compressor Water cooled or air cooled condenser Electric panel Thermosatic expansion valve Air filter

Front panel Evaporator fan and housing heating and humidifying components:

PACKAGE AIR CONDITIONER CONDENSER TYPE The condenser used in a package air

conditioner can be air-cooled or water-cooled type.

air-cooled type is usually for capacity below 5 tone and water-cooled for capacity above 5 tone.

The capacity of air-cooled type is lower than that of water-cooled condenser using the same compressor.

In water cooled condenser- all components are assembled at the factory site. The gas charging is also done at the factory thus one does not have to perform the complicated operations of the laying piping, evacuation, gas charging and leak testing at the site.

In air-cooled condenser- There is a outdoor unit that comprises of the important components like the compressor, condenser and in some cases the expansion valve.

AIR QUANTITIES In the air distribution, centrifugal fans are

usually provided at the evaporator side which can develop higher static pressure.

Air distribution is done through ducts and grills.

The air quantities are usually in the range of 10-11.3 cubic meter/min per tone.

In critical application such as computer room which need higher rate of air flow,higher capacity fans with air flow up to 550 cfm are provided.

TWO REFRIGERATION SYSTEMS In some units,two independent

refrigeration systems are include in the package. In this case, the cooling coils have a common tube sheets though the two systems are independent.

Two separate water-cooled condenser or a condenser with an internal partition that forms two independent condensers are used.

It is a common practice to have one compressor running all the time with the other compressor control by a single-stage thermostat.In this case, the capacity can be controlled

either to 50% to 100%.

HOW DO PACKAGE UNIT WORK? Package units are unique, all-in-one self

contained systems that supply both cooling and heating equipment in one “package”. These units can be situated in a mechanical room, at grade adjacent to the condition space or on the rooftop of home or business.

Unlike split system, package units combine a condenser coil, evaporator coil, cooling fan, compressor and in many models, a gas furnace all in the same unit.All are equipped with a blower (centrifugal fan) to distribute the conditioned air throughout the structure.

Package units come in three variants:- Package heat pumps offering heating/cooling using heat pump technology. Packaged air conditioners tocool your residence or business and can heat it as well, using electric resistance heat strips during the cold winter season. Packaged gas-electric units offer all-in-one air conditioning and natural or LPG gas- powered furnace performance.

BENEFITS OF PACKAGE SYSTEM Space efficiency- Unlike split systems

units, all components of complete heating and cooling system are contained in one location,making package units ideal for scenarios in which indoor space is at a premium.

Energy efficient heating and cooling performance- All package units now offer 13 SEER or higher cooling performance. Gas package units offer 80% AFUE heating performance or better.

Low initial investment- Manufacturers can carefully match component capacity and efficiency to maximize performance in a tightly integrated cost effective package.

Quick installation- Since all components are factory preassembled little on-site fabrication is necessary thereby eliminating many of the challenges of split system installation.

Aesthetics- Package units have virtually zero living or commercial space requirements.

Safety- Package units are installed by certified professionals who understand the technical challenges of constructing a gas supply system high voltage wiring,high pressure refrigerant lines and routing critical condensate lines.

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