Electricity for Refrigeration, Heating, and Air Conditioning
9th Edition
ISBN: 9781285179988
Author: Russell E. Smith
Publisher: Cengage Learning
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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
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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- In a high voltage circuit,is the fan motor a power passing or power consuming device?arrow_forwardWhat are the modern applications of adaptive control in control engineering? why does car air conditioner switches on with ignition?arrow_forwardTime constant of thermocouple is 3 milliseconds. An engineer measures the temperature of water and sees that the temperature is less than the real temperature of the boiling water (100 C). How long does the engineer need to wait at least to see the 95 C? 8 milliseconds 5 milliseconds 3 milliseconds none of the given 9 milliseconds not sufficient informationarrow_forward
- 14. During the summer the temperature inside a van reaches 130 F while the outside temperature is a constant 95 F. When the driver gets into the van, she turns on the air conditioner with the thermostat set at 60F If the time constant for the van is 1/K, = hr, when will the temperature inside the van reach 80 F?arrow_forwardI need to solve question 1arrow_forwardWhy are digital scales preferred over other types for charging refrigeration and air-conditioning systems?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_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_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_forward
- Why is a low-voltage thermostat normally more accuratethan a high-voltage thermostat?arrow_forwardA domestic refrigerator sits in a kitchen, switched on, with the refrigerator door wide open. The kitchen itself is well insulated and it can be assumed no heat can escape or enter the kitchen from the outside. Which of the following is the most accurate statement. а. The temperature in the kitchen will stay the same. O b. The temperature in the kitchen could go up or down depending on the mechanical efficiency of the compressor. O c. The temperature in the kitchen will go down very slightly. d. The temperature in the kitchen could go up or down, depending on the Coefficient of Performance (COP) of the refrigerator. е. The temperature in the kitchen will go up very slightly.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
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