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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Chapter 5, Problem 1RQ
What are the three types of electrical diagrams used in the heating, cooling, and refrigeration industry?
Expert Solution & Answer
To determine
The three types of electrical diagrams used in heating, cooling, and refrigeration industry.
Explanation of Solution
The three types of electrical diagrams used in heating, cooling and refrigeration industry are as follows:
- 1. Schematic diagrams: Schematic diagrams are the diagrams having symbols of electrical components and lines to represent wiring and these are also known as circuit diagrams. They represent the connection of the electrical objects in a circuit that helps to find an error in a circuit so that it can be rectify before manufacturing it.
- 2. Pictorial diagrams: Pictorial diagrams are also similar to schematic diagrams. They differ by the presentation of electrical objects in the circuit. In pictorial diagrams, the electrical objects are represented by the actual picture of the electrical objects. These diagrams are easy to understand because of the picture presentation of objects.
- 3. Installation diagrams: Installation diagrams are also called as wire diagrams. The wires are represented by the different colors and sizes so that the installer easily understands the connections. These diagrams also give the information about the arrangement of the devices and their relative positions.
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Students have asked these similar questions
4.75 An air-conditioning system is shown in Fig. P4.75 in which
air flows over tubes carrying Refrigerant 134a. Air enters
with a volumetric flow rate of 50 m³/min at 32°C, 1 bar, and
exits at 22°C, 0.95 bar. Refrigerant enters the tubes at 5 bar
with a quality of 20% and exits at 5 bar, 20°C. Ignoring heat
transfer at the outer surface of the air conditioner, and
neglecting kinetic and potential energy effects, determine at
steady state
(a) the mass flow rate of the refrigerant, in kg/min.
(b) the rate of heat transfer, in kJ/min, between the air and
refrigerant.
3
R-134a
P3 = 5 bar
x3 = 0.20
Refrigerant 134
Air
P₁ = 1 bar
T₁ =32°C 305 K
(AV), 50 m³/min
=
Air
2-P2 = 0.95 bar
T2 22°C 295 K
=
=
4
R-134a
P4 = 5 bar
T4=20°C
4.42 Steam enters a well-insulated turbine operating at steady
state at 4 MPa with a specific enthalpy of 3015.4 kJ/kg and a
velocity of 10 m/s. The steam expands to the turbine exit where
the pressure is 0.07 MPa, specific enthalpy is 2431.7 kJ/kg,
and the velocity is 90 m/s. The mass flow rate is 11.95 kg/s.
Neglecting potential energy effects, determine the power
developed by the turbine, in kW.
The two blocks A and B have weights WA = 60 lb and
WB = 10 lb. If the kinetic coefficient of friction between the
incline and block A is μk = 0.2, determine the speed of A
after it moves 3 ft down the plane starting from rest. Neglect
the mass of the cord and pulleys.
3
B
Chapter 5 Solutions
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Ch. 5 - What are the three types of electrical diagrams...Ch. 5 - A load is an electrical device that __________. a....Ch. 5 - What is the major load of an air-conditioning...Ch. 5 - Identify the following symbols for loads:Ch. 5 - Prob. 5RQCh. 5 - What do the terms normally open and normally...Ch. 5 - What is the difference between a magnetic starter...Ch. 5 - Prob. 8RQCh. 5 - Draw a heating and a cooling thermostat and...Ch. 5 - A three-pole contactor would allow how many paths...
Ch. 5 - A disconnect switch is used to __________. a. open...Ch. 5 - What determines whether a pressure switch opens or...Ch. 5 - Identify the following symbols for...Ch. 5 - What is the difference between a thermal overload...Ch. 5 - What is the purpose of a transformer? Draw the...Ch. 5 - Which of the following is not a requirement for an...Ch. 5 - What is the purpose of a legend on a schematic...Ch. 5 - A factual diagram is _____. a. a pictorial diagram...Ch. 5 - Identify the following symbols for safety devices.Ch. 5 - Prob. 20RQCh. 5 - True or False: The schematic diagram tells service...Ch. 5 - What is the difference between a pilot duty and a...Ch. 5 - What type of switch would be used to open or close...Ch. 5 - What is the purpose of a fuse in an electrical...Ch. 5 - True or False: A solenoid valve is a device that...Ch. 5 - What is a signal light used for in a control...Ch. 5 - Change the following normally open elements from...Ch. 5 - Draw the symbols for the following electrical...Ch. 5 - Add letter designations to the symbols to indicate...Ch. 5 - Draw a symbol for a magnetic starter.
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- 123 12) The spring has a stiffness k = 200 N/m and an unstretched length of 0.5 m. If it is attached to the 3-kg smooth collar and the collar is released from rest at A, determine the speed of the collar when it reaches B. Neglect the size of the collar. 2 m S Z k=200 N/m B 1.5 marrow_forward11) The assembly consists of two blocks A and B which have a mass of 20 kg and 30 kg, respectively. Determine the speed of each block when B descends 1.5 m. The blocks are released from rest. Neglect the mass of the pulleys and cords. Barrow_forward8) The 1000-lb elevator is hoisted by the pulley system and motor M. If the motor exerts a constant force of 500 lb on the cable, determine the power that must be supplied to the motor at the instant the load has been hoisted s = 15 ft starting from rest. The motor has an efficiency of ε = 0.65. 0000arrow_forward
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