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HVAC > Condensor > Flashcards

Condensor Flashcards

1
Q

De superheat

A

Sensible Cooling of discharge reaper

Contains superheat, motor heat, and heat

First 10 to 15% of condenser

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2
Q

To condense

A

Removal of light and heat from the evaporator

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3
Q

Subcool

A

Sensible cooling of liquid refrigerant occurs in the last 5 to 10% of condense

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4
Q

Condenser split

A

The difference between condensing temperature minus air entering the condenser

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5
Q

Condenser splits very

A

Standard refrigeration and AC is 10 SEER or 30°

Commercial 20 to 25

High-efficiency 15 to 20

Remote refrigeration 10 to 30

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6
Q

Subcooling

A

Condensing temperature minus liquid line temperature

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7
Q

Subcooling prevents…

A

Flash, gas, and liquid line

1° of sub Cooling equals half percent increase system system efficiency

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8
Q

Condensed liquid can flash into vapour from

A

Pressure drop and added heat

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9
Q

Adding refrigerant…

A

Raises sub, Cooling

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10
Q

Low ambient

A

Air entering the condenser below 60

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11
Q

Low head pressure causes metering problems

A

The TEV would starve the evaporator

90° or below is low pressure

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12
Q

Two methods to control head pressure

A

Fan cycle control, and condenser flooding

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13
Q

Fan cycle

A

Wood head pressure falls the fan shuts off

When head pressure rises, the fan starts

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14
Q

Condenser flooding

A

Same as overcharging the unit

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15
Q

HP stands for head pressure regulating valve

A

It restricts liquid flow out of condenser back up, refrigerant in the condenser raises, head pressure and bypasses, hot gas to warm, cool liquid 

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16
Q

Cleaning condensers

A

Use a non-acid coil cleaner and use pump, sprayer pressure washer, steam or hot water hose

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17
Q

Indoor condensers

A

Clean condenser first and clip as hooks onto the condenser face mount of fibreglass air filter on the S hooks

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18
Q

Ice machines

A

Most have factory installed condenser filters

19
Q

Microchannel condenser coil

A

Flat plates or channels, replace around tubing and new designs, increase condenser efficiency and condenser size is reduced

20
Q

Tube tube water cooled condensers

A

Refrigerant flows in the outer tube

21
Q

Flanged type

A

Two straight tubes one inside the other and flanges are moveable for cleaning

22
Q

Coil type

A

Two coil tubes, one inside the other 

23
Q

Regulating valve helps

A

Coldwater comes in and lowers head pressure condensing temperature so the regulating valves help maintain consistent of these 

24
Q

If mineral buildup is more than 10°

A

You can adjust the water regulating valve with a service valve inch to adjust flow 

25
Q

Where do minerals start to form?

A

We’re hot. Gas enters in the warm condenser water leaves.

26
Q

Shell and tube water cooled condensers

A
27
Q

Wastewatersystems

A

City water washed down drain

Use 1.5 gpm at 75 degrees

28
Q

Recirculated systems (cooling towers)

A

Circulate 3gpm ton at 85 degrees

29
Q

Fan at air outlet

A

Pulls air through tower

Cools water rejects heat

30
Q

Fan pushes air

A

Through cooler

31
Q

Evaporating water cools condenser

A

Which is inside the tower

32
Q

Cooling towers are heat rejecters

A

They do not condense refrigerant and are not considered condensors

33
Q

Water cooled condenser is part of

A

Water cooled chiller

34
Q

Entering Wet Bulb Temp

A

Lowest temp that water can theoretically reach evaporation

Most important parameter in tower selection

35
Q

Approach

A

Is difference between water leaving and entering wet bulb

36
Q

7F is common

A

78 and 85 from approach

37
Q

Range

A

Difference is difference temp in water leaving and entering of tower (9.4-10

38
Q

Total Heat Rejection

A

Amount of sheet to be removed from the circulating water within the tower

It is equal to the refrigeration effect plus the work of compression

115-2118

39
Q

Drifted or winded

A

Drift is air that gets in trained in the airflow and discharge to the atmosphere

Very small and very widely does not include water by evaporation

Proximately 0.00 0.00

40
Q

Evaporation

A

For each pound of water cooling power evaporates it removes about 1050 BTU from the water that remains

Approximately one percent of tower GPM

41
Q

Blow down or bleed off

A

Water contains impurities when it is evaporated. These impurities are left behind.

Bleed test is determined by specialist who are trained

42
Q

Make up is amount of water

A

Required to replace normal losses caused by drift evaporation blowdown

43
Q

Types of cooling towers

A

Natural draft, which is atmospheric and mechanical draft which has a induced drive-through and forced blow through

HVAC (16 decks)

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