MCCCD Official Course Competencies:

HVA103  2004 Spring – 2008 Fall

Refrigeration Applications and Components II

1.

Apply knowledge of terms and equations related to mass, density, flow, acceleration, and gravity. (I)

2.

Explain the concept of pressure including its units of measurement and methods for measuring it. (II)

3.

Perform calculations to include work and power, temperature, and changes in heat and gases. (III, VII, IX, X)

4.

Explain energy and the Law of Conservation. (IV)

5.

Describe matter including its specific states and molecular make-up. (V)

6.

Differentiate between temperature and heat. (VI)

7.

Describe specific terms related to heat, methods of heat transfer, and the direction and ratio of heat transfer. (VIII)

8.

Explain changes in gases using the Laws of Boyles, Charles and the general gas laws. (X)

9.

With supporting explanation, plot specific processes of gases. (XI)

10.

Differentiate between the stages of vapors and liquids. (XII)

11.

Interpret pressure-temperature tables. (XIII)

12.

Describe the refrigeration process, component parts, and function. (XIV)

13.

Evaluate refrigeration system capacity and the processes of the refrigeration cycle. (XV, XVIII, XIX)

14.

Explain the component parts of the pressure-enthalpy (p-h) diagram and function of the chart. (XVI)

15.

Plot a simple saturated refrigeration cycle on the p-h chart. (XVII)

16.

Compare and contrast the processes to increase condensing Temperature and to decrease suction temperature. (XX)

17.

Calculate the effects of superheating and subcooling during the refrigeration cycle. (XX, XXII)

18.

Compare and contrast the simple saturated cycle with a super- heated and a subcooling cycle. (XXI, XXIII)

19.

Evaluate the effects of a liquid to suction heat exchange. (XXIV)

20.

Evaluate the effects of pressure loss resulting from friction within the refrigeration cycle. (XXV)

MCCCD Official Course Outline:

HVA103  2004 Spring – 2008 Fall

Refrigeration Applications and Components II

I. Specific terms and equations

A. Terms

1. Mass and density

2. Specific gravity

3. Mass and volume flow ratio

4. Velocity and speed

5. Acceleration

6. Acceleration of gravity

B. Equations

1. Mass and density

2. Specific gravity

3. Mass and volume flow ratio

4. Velocity and speed

5. Acceleration

6. Acceleration of gravity

II. Pressure - its units and methods of measuring

A. Pressure

B. Units pounds/area

C. Methods of measuring

1. Atmospheric

2. Barometers

3. Pressure gauges

4. Manometers

5. Bourdon gauges

6. Absolute pressure

III. Work, power and equations

A. Work

B. Power

C. Equations

1. Work

2. Power

IV. Energy and the Law of Conservation

A. Energy

B. Component parts

1. Kinetic

2. Potential

3. Total internal energy

C. Law of Conservation

V. Matter and molecular make up

A. Matter

B. States of matter

1. Solid

2. Liquid

3. Vapor (gaseous)

VI. Temperature and heat

A. Temperature characteristics

B. Heat characteristics

C. Differences

VII. Temperature measurements and calculations

A. Temperature measuring

B. Scales

1. Celsius

2. Fahrenheit

3. Kelvin

4. Rankine

C. Calculate scale changes

1. Celsius c=f-32/1.8

2. Fahrenheit f=(1.8) (c)+32

3. Kelvin C=273

4. Rankine F+460

VIII. Direction and rate of heat transfer, methods of heat transfer and associated terms

A. Terms

1. British thermal unit

2. Specific heat

3. Sensible heat

4. Latent heat

5. Super heat

B. Heat transfer

1. Rate

2. Direction

3. Methods

C. Other

IX. Calculate heat changes

A. Q=MC (T2-T1) sensible-temperature change

B. Q=(M) (hif) latent-fusion

C. Q=(M) (hfg) latent-vaporization

D. Mechanical energy Q=w/j

X. Boyles, Charles, general gas laws

A. Laws

1. Boyles

2. Charles

3. General

B. Calculate changes in gases

XI. Specific processes of gases

A. Processes

1. Pressure volume

2. Constant temperature

3. Isothermal

4. Adiabatic

5. Polytropic

B. Plot

XII. Vapor and liquids

A. Vapors

1. Superheated

2. Saturated

3. Effects of pressure

4. Vaporization

5. Evaporation

6. Condensation

B. Liquid-vapor mixture

C. Liquid

1. Saturated

2. Subcooled

XIII. Pressure-temperature tables

A. Pressure

1. Gauge

2. Absolute

B. Temperature relationship

C. Table components

1. Temperature

2. Pressure

3. Volume

4. Density

5. Enthalpy

6. Entropy

XIV. Refrigeration process

A. Process

B. Components

C. Function

XV. System capacity

A. Mass flow rate

B. Volume flow rate

C. Refrigeration effects

D. Compressor capacity

XVI. Pressure-enthalpy diagram of function of chart

A. Regions

1. Subcooling

2. Saturated mix

3. Superheated

B. Identify lines

C. Function of chart

XVII. Saturated refrigeration cycle

A. Simple refrigeration cycle

B. Plotting cycle

C. p-h diagram

XVIII. Refrigeration process

A. Vaporizing process

B. Compression process

C. Expansion

D. Condensing

E. Theoretical power

F. Coefficient of performance

XIX. Refrigeration cycle processes

A. Increase in condensing with a contrast suction

B. Decrease in vaporization with a contrast condensing

XX. Superheating during the refrigeration cycle - calculations of effects

A. qe (British Thermal Unit - evaporator)

B. qw (Work)

C. qc (Condenser)

D. Theoretical power

E. COP (Coefficient of performance)

XXI. Simple saturated cycle versus superheated cycle

A. qe (British Thermal Unit - evaporator)

B. qw (Work)

C. qc (Condenser)

D. Theoretical power

E. COP (Coefficient of performance)

XXII. Subcooling during the refrigeration cycle

A. qe (British Thermal Unit - evaporator)

B. qw (Work)

C. qc (Condenser)

D. Theoretical power

E. COP (Coefficient of performance)

XXIII. Subcooling cycle versus a saturated cycle

A. qe (British Thermal Unit - evaporator)

B. qw (Work)

C. qc (Condenser)

D. Theoretical power

E. COP (Coefficient of performance)

XXIV. Effects of liquid to suction heat exchanger

A. Subcooling liquid region

B. Superheated region

C. Capacity changes

1. qe (British Thermal Unit - evaporator)

2. qw (Work)

3. qc (Condenser)

4. Theoretical power

5. COP (Coefficient of performance)

XXV. Effect of pressure loss

A. Evaporation

B. Suction line

C. Discharge line

D. Condenser

E. Metering device

F. Capacity of system

1. qe (British Thermal Unit - evaporator)

2. qw (Work)

3. qc (Condenser)

4. Theoretical power

5. COP (Coefficient of performance)