MCCCD Official Course Competencies:

HVA210  2003 Fall – 2011 Fall

Facilities Air Conditioning Systems

1.

Identify the abbreviations used to describe the temperature ranges for heating and cooling systems. (I)

2.

Convert between the United States customary system (USCS) and the International Systems (SI) of units measurement. (II)

3.

List the four environmental conditions controlled by an air conditioning system. (III)

4.

Describe the types of zoned air conditioning systems and characteristics of all-water and air-water systems. (IV)

5.

Describe the components and their function of a forced air system (V)

6.

Explain the units of measurements related to air and the use of specific measuring equipment. (V)

7.

Determine the amount of cooling or heat required to keep rooms in a building within their temperature specifications. (VI, VII)

8.

Identify the variable properties of air using the psychometric chart. (VIII)

9.

Determine mixed air conditions, required supply air conditions, and reheat requirements using the psychometric chart. (VIII)

10.

Distinguish between different types of commercial fans and select a fan using manufacturer fan curves. (IX)

11.

Describe the operation of chilled-water air conditioning systems. (X)

12.

State the type of compressors and refrigerants used with high-pressure water chillers (X)

13.

Explain the purge system used on low-pressure refrigerants. (X)

14.

State the relationship of cooling capacity of the water tower and the wet-bulb temperature of the outside air. (XI)

15.

Describe and calculate the properties of water for specific conditions. (XII)

16.

Calculate pressure distribution in hydronic systems. (XIII)

17.

Calculate fluid flow, pressure loss, and head loss in pipes. (XIV, XV)

18.

Describe pump operating characteristics and evaluate pump performance. (XVI)

19.

Describe the process for pressurization of a closed hydronic system. (XVII)

20.

Describe expansion and pressurization equipment and determine correct tank size. (XVII)

21.

Describe the process for pressurization and pressure boosting of open hydronic systems. (XVIII)

22.

Describe the basic features of warm air furnaces and heating boilers. (XIX)

23.

Describe the function of the operating and safety controls for furnaces and boilers. (XIX)

24.

Calculate specific applications for heat storage. (XX)

25.

Explain specific types of terminal users (units) and evaluate coil performance. (XXI)

26.

Describe the theory and components related to automatic control. (XXII)

27.

Explain specific types of distribution systems and calculate constant and variable volume. (XXIII)

28.

Compare and contrast constant volume to variable volume of chilled water systems. (XXIII)

29.

Describe the operating temperature and pressures for high and low temperature water systems. (XXIV)

30.

Describe the procedure for interconnections of dual temperature systems. (XXV)

MCCCD Official Course Outline:

HVA210  2003 Fall – 2011 Fall

Facilities Air Conditioning Systems

I. Abbreviation and Temperature Ranges

A. Abbreviations

B. Temperature ranges

II. Measurement Systems

A. United States customary system (USCS)

B. International system of units (SI)

III. Scope and Uses of Air Conditioning

A. Scope of air-conditioning

B. Four environmental conditions

C. Components of air conditioning systems

D. All-Water (hydronic) air conditioning systems

E. Human comfort

F. Comfort standards

IV. Air Conditioning Systems and Equipment

A. All-air systems

1. single zone systems

2. reheat systems

3. multizone systems

4. dual duct systems

5. variable air volume

B. All-water systems

C. Air-water systems

1. room units

2. unitary air conditioners

3. rooftop units

D. Air handler units

1. cooling and heating units

2. coil selection

E. Air filters

1. methods of dust removal

2. types of air cleaners

3. selection

V. Forced Air System

A. Components

B. Function

C. Duct pressure

1. total

2. static

3. velocity

D. Units of measurement

1. cubic feet per minute

2. cubic feet per second

3. feet per minute

E. Measuring equipment

1. incline manometer

2. u-tube manometer

3. rotating vane anemometer

4. deflecting vane anemometer

5. magnehelic

6. pitot tube

F. Air ducts

1. types of duct systems

2. configurations

VI. Heating Loads

A. Heat transfer

1. rate

2. thermal resistance

3. coefficient

4. losses

B. Infiltration and ventilation heat loss

C. Design conditions

VII. Cooling Loads

A. Room heat gains

1. exterior

2. interior

3. solar radiation

4. lighting

5. people

6. equipment

7. infiltration

B. Design conditions

C. Other heat gains

1. ducts

2. fan and pump

D. Duct air leakage

VIII. Psychrometrics

A. Terms

1. dry bulb

2. wet bulb

3. dew point

4. relative humidity

5. specific humidity

6. enthalpy

7. sensible heat ratio

8. total heat

B. Points

1. dry bulb line

2. wet bulb line

3. dew point

4. relative humidity

5. specific humidity

6. enthalpy scale

7. sensible heat scale

C. Application

1. room conditions

2. sensible heat ration line

3. leaving conditions

4. apparatus dew point

5. sensible heat process

6. humidifying

7. dehumidifying

D. Conditions for standard air

1. 14.7 psi

2. 69 deg. F.

3. 13.34 ft3/lb

4. .075 lb/ft3

5. .24 BTU/lb.

IX. Fans and Air Distribution Devices

A. Fan types

B. Fan characteristics

1. performance

2. selection

3. ratings

C. Fan system interaction

1. effect

2. selection of optimum conditions

3. fan laws

D. Construction and arrangements

1. installation

2. energy conservation

E. Air distribution devices

1. patterns

2. location

3. types of air supply devices

4. accessories and connections

5. return air devices

6. sound control

X. Chilled Water Systems

A. Compression cycle chillers

1. high pressure

2. low pressure

B. Reciprocating compressors chillers

1. refrigerants

2. cylinder unloading

3. scroll

4. rotary screw

C. Centrifugal compressor chillers (high pressure)

1. centrifugal compressor

2. evaporators

3. condensers

4. metering devices

D. Low pressure chillers

1. refrigerants

2. compressors

3. condensers

4. metering devices

5. purge units

E. Pump

1. create a pressure difference

2. circulates liquid through the system

F. Absorption Air Conditioning Chillers

1. process

2. simplified absorption refrigeration machine

XI. Cooling Towers

A. Function

B. Types

C. Fire protection

D. Fill material

E. Flow patterns

F. Tower materials

G. Fan section

H. Access

I. Sump

J. Makeup water K Blowdown

XII. Properties and Calculation of Water

A. Properties of water

B. Calculations

XIII. Pressure Distribution

A. Bernoulli's equation

B. Pressure continuity

C. Gravity circulation

D. Resistance head

E. Pressure distribution in open systems

F. Velocity head

G. Parallel paths

XIV. Fluid Flow in Pipes

A. Noise and erosion

B. Laminar flow

C. Effects of flow rate variation

D. Pipe sizing

E. Pump selection

XV. Fluid Flow Calculations

A. Effects of flow rate variation

B. Frictional resistance

C. Pipe sizing

D. Temperature difference

E. Head loss

F. Pump selection

XVI. Pump Characteristics and Performance

A. Characteristics curve

B. Parallel pump operation

C. Variable speed operation

D. Series pump operation

E. Performance

1. starting and stopping pumps

2. impeller size

3. low flow rates

XVII. Pressurization process for closed system

A. Base pressure-purpose and method

B. Primary circuits

1. pump suction

2. pump discharge

3. return

4. split pressurization

C. Primary-secondary systems

D. Interconnected heating and cooling system

E. Branches, subcircuits and secondary circuits

F. Expansion and pressurization equipment

1. expansion tank

2. pump pressurization

3. compression tank

4. calculations for tank size

XVIII. Pressurization Process and Pressure Boosting for Open System

A. Different elevations-atmosphere

B. Combination open and closed systems

C. Vertical distribution

D. Lower supply primary circuits

E. Pressure boosting

XIX. Furnaces and Boilers

A. Furnace controls

B. Heating boilers

1. controls

2. draft

3. fuels

4. flame safety controls

5. boiler application rating and selection

6. installation

C. High efficiency boilers and furnaces

XX. Heat Storage Calculations

A. Heat storage-purpose and method

B. Constant-volume-flow

1. mixing type

2. displacement type

C. Open storage

D. Pressurized closed storage

E. Calculations

1. heat storage capacity

2. storage tank design

XXI. Terminal Users (units)

A. Heat transfer

B. Types of terminal users

C. Coil performance

XXII. Automatic Control

A. Control systems

B. Pilot-operated valves

C. Regulating valves

D. Application to hydronic systems

XXIII. Distribution Systems

A. One-pipe

B. Two-pipe

C. Constant-volume

D. Variable-volume

E. Calculations

XXIV. High and Low Temperature Water Systems

A. Low temperature water systems

B. High temperature water systems

1. design parameters

2. flash suppression

3. blending different temperatures

4. pumps in high water service

5. user end high temperature water

6. water recirculation

7. type and location of expansion and pressurization means

XXV. Dual Temperature System

A. Interconnection-terminal end

B. Interconnection-generator

C. Interconnection-both ends