Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Textbook Question
Chapter 45, Problem 2RQ
The operating condition for the single compressor in a household refrigerator is the lowest box temperature, which is typically
A. 0°F
B. -20°F
C. 20°F
D. 40°F
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Chapter 45 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 45 - The typical temperature inside the fresh-food...Ch. 45 - The operating condition for the single compressor...Ch. 45 - When the air temperature in a domestic freezer is...Ch. 45 - Typical head pressures should correspond to a...Ch. 45 - Using the temperature/pressure chart in Unit 3,...Ch. 45 - Using the pressure/temperature chart in Unit 3,...Ch. 45 - If a forced-draft evaporator fan motor is wired in...Ch. 45 - Frost accumulates on the evaporators of...Ch. 45 - The defrost cycle in a domestic refrigerator may...Ch. 45 - Prob. 10RQ
Ch. 45 - What are the two types of evaporators found in...Ch. 45 - Refrigerators currently being manufactured in the...Ch. 45 - Condensers in these refrigerators are...Ch. 45 - Home freezers are air-cooled and may have...Ch. 45 - Induced-draft condensers are typically used with...Ch. 45 - The capillary tube metering device is usually...Ch. 45 - Prob. 17RQCh. 45 - If the compressor has liquid refrigerant returning...Ch. 45 - Some freezers may have ______heaters to prevent...Ch. 45 - Welded ______sealed compressors are normally used...Ch. 45 - Special heaters called ______heaters are often...Ch. 45 - Prob. 22RQCh. 45 - Prob. 23RQCh. 45 - The adjustment device used for low atmospheric...Ch. 45 - Prob. 25RQ
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- A tankless water-heating system gets its heat from thesystem's_______.arrow_forwardA(n) ______well draws water from the top of thewater column, circulates it through the heat pump, and then returns the water to the bottom of the water column.arrow_forwardWhat effect does a slight amount of liquid refrigerant have on a compressor over a long period of time?arrow_forward
- The typical temperature relationship between a standard-efficiency air-cooled condenser and the ambient temperature is A. 50F. B. 40F C. 30F. D. 20F.arrow_forwardIn order to remove moisture from a refrigeration system using a vacuum pump, it must be in a _____state.arrow_forwardIn a solar cooling vapor compression refrigerator system, which component absorbs the heat from the cold space? Select one: a. Condenser coils b. Evaporator c. Receiver d. Compressorarrow_forward
- Question#1 Pressure-enthalpy chart is another method to obtain an initial performance estimation of refrigeration/heat pump cycles used in heating, ventilation and air-conditioning (HVAC) system. Your role is to provide design and installation services for air -conditioning (AC) system a preliminary performance estimation. Given the following design specifications: Refrigerant HFC-134a as the working fluid - Ideal cycle operation condition is assumed - Cycle is operated at high pressure line of 0.8 MPa - Cycle is operated at low temperature line of – 10° C Flow rate is 0.1 kg/sec The head of the department in the company that you are working in asked you to make use of pressure -enthalpy chart provided for HFC-134a refrigerant Task.1 1. Determine the Refrigeration effect (RE), heat of compression (HOC), and heat of rejection (HOR) and their corresponding rate/power values in kW.arrow_forwardNumber 3 The food storage room requires a cooling system with a capacity of 15 tons of refrigeration that operates at an evaporator temperature of -17.5 ° C and a condenser temperature of 37.0 ° C. The refrigerant used is R-134a and the system operates in saturated conditions. a. COP= b.Refrigerant flow rate = Answer in kg / s. c. Heat loss rate in condenser = Answer kJ / s.arrow_forwardQuestion#1 Pressure-enthalpy chart is another method to obtain an initial performance estimation of refrigeration/heat pump cycles used in heating, ventilation and air-conditioning (HVAC) system. Your role is to provide design and installation services for air -conditioning (AC) system a preliminary performance estimation. Given the following design specifications: Refrigerant HFC-134a as the working fluid - Ideal cycle operation condition is assumed - Cycle is operated at high pressure line of 0.8 MPa Cycle is operated at low temperature line of – 10° C Flow rate is 0.1 kg/sec The head of the department in the company that you are working in asked you to make use of pressure -enthalpy chart provided for HFC-134a refrigerant Task.1 2. Estimate the COPR 3. Determine the low-pressure line value.arrow_forward
- What is the coefficient of performance of the refrigeration plant mentioned in # 3?* a. 3.1 b. 3.4 c. 3.7 d. 3.9arrow_forward1* PROBLEM 1.O A standard vapor compression system produces at 24 Tons of Refrigeration using R-22 as a refrigerant while operating between a condenser temperature of 38.5°C and an evaporating temperature of -17.3 °C. The compressor has a 4% clearance volume, 0.75 compression efficiency and 0.78% mechanical efficiency. Compute a) mass flow rate of refrigerant in kg/min, b) volume flow rate (m3/h) of cooling water in the condenser if the water temperature is increased by 12°C, c) clearance volumetric efficiency, d) ideal and actual COP, and e) brake work in kW 1 Add filearrow_forwardTrue or False: All heat pumps are practical anywhere inthe United States. Explain your answer.arrow_forward
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