Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN: 9781337399128
Author: Russell E. Smith
Publisher: Cengage Learning
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Textbook Question
Chapter 3, Problem 19RQ
Why are series-parallel control circuits important in the circuitry used in air-conditioning equipment?
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Chapter 3 Solutions
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Ch. 3 - What is a series circuit?Ch. 3 - What is a control circuit?Ch. 3 - Safety devices in an electrical circuit are...Ch. 3 - How are series circuits used in air-conditioning...Ch. 3 - Why are series circuits used for most control...Ch. 3 - The current draw in a series circuit is _____. a....Ch. 3 - The voltage drop of a series circuit is _____. a....Ch. 3 - How would switches used as safety devices be...Ch. 3 - Draw a series circuit with a thermostat, a...Ch. 3 - Two identical 115-volt light bulbs connected in...
Ch. 3 - Prob. 11RQCh. 3 - Prob. 12RQCh. 3 - Parallel circuits are used in the air-conditioning...Ch. 3 - Why are parallel circuits used in the...Ch. 3 - Prob. 15RQCh. 3 - Prob. 16RQCh. 3 - If two 115-volt loads were connected in parallel...Ch. 3 - What is a series-parallel circuit?Ch. 3 - Why are series-parallel control circuits important...Ch. 3 - Draw a series-parallel circuit with one switch...Ch. 3 - What is the resistance of a parallel circuit with...Ch. 3 - What is the resistance of a parallel circuit with...Ch. 3 - What is the total ampere draw of a parallel...Ch. 3 - What is the voltage of a series circuit with four...Ch. 3 - What is the resistance of a series circuit with...
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- The figure-of-merit indicating the quality of a refrigeration unit is usually the coefficient of performance COP ≡ heat absorbed/net work put in What is the COP for this magnetic refrigeration device? (use wnet = 100 J/mol)arrow_forwardWhy are digital scales preferred over other types for charging refrigeration and air-conditioning systems?arrow_forwardII. Circuit Analysis The circuit below illustrates an electro-pneumatic system, answer the following questions: +34V 1 3 4 2 S2E Y1 5V Pneumatic circuit Electric circuit 1. What is the type of switch S1 and S2? 2. Is the electric circuit above direct or indirect? Explain why? 3. What is the name of the part which labeled as Y1? 4. Explain what happen when switch S1 is pressed. 5. Suggest a way to extend the cylinder, and what do you think is the application of this type of circuit? 4,arrow_forward
- Q1- The following data relates to the office air conditioning plant having maximum seating capacity of 25 occupants: Outside design conditions Inside design conditions Solar heat gain Latent heat gain per occupant = 120 W Sensible heat gain per occupant = 100 W Lightening load Sensible heat load from other sources = 11000 W = 34°C DBT, 28°C WBT = 24°C DBT, 50% RH = 9120 W = 2500 W Infiltration load = 16 m / mim tas(ADP) = 8 °C Assuming 30% fresh air and 70% of recirculated air passing through the evaporator coil and the by-pass factor of 0.15, find the dew point temperature of the coil, capacity of the plant, Volume flow rate of supply air, Supply air temperature.arrow_forwardWhat is the heat output, in Btu/h, of a terminal unit with a T of 10F and a water flow rate of 5 gpm?arrow_forwardThree water coils are connected in parallel. The water supplied to the coils feeds into a commonreturn line. The first coil feeds 60 gpm of 125 o F water into the return line. The second coil feeds 50gpm of 120 o F water into the line. The third coil feeds 50 gpm of 118 o F water into the commonreturn line. What is the temperature of the water in the common line after the three streams ofwater mix?arrow_forward
- Why is a low-voltage thermostat normally more accuratethan a high-voltage thermostat?arrow_forwardThree common controls used in central electric heat applications are thermostats, contactors (or relays), and A. capacitors. B. sequencers. C. cool anticipators.arrow_forwardUnder what conditions, an absorption machine give less cooling effect?arrow_forward
- 1 The condenser can be part of which loop(s)? a- Airside loop b- Chilled-water loop c- Refrigeration loop d-Heat-rejection loop e-Controls loop 2 The evaporator can be part of which loop(s)? a- Airside loop b- Chilled-water loop c- Refrigeration loop d-Heat-rejection loop e-Controls loop 3 Which loop is eliminated in a direct expansion (DX) system? a- Airside loop b- Chilled-water loop c- Refrigeration loop d-Heat-rejection loop e-Controls loop 4 What are some benefits of using a "packaged" piece of cooling equipment rather than a "split" system?arrow_forwardWhy is a low-voltage thermostat normally more accurate than a high-voltage thermostat?arrow_forward5. What are the features of the central air conditioning system? 6. What are the disadvantages of using central air conditioning?arrow_forward
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