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 10, Problem 10RQ
A portion of a refrigerant blend that is evaporating or condensing before the rest of the same blend is called__________.
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In the diagram below inlet air is drawn over a pool of liquid water in a steady-state, steady-flow isobaric process. Evaporation on the pool resultsin saturated air at the exit. The pool of liquid water is assumed to be at the same temperature as the exitair. Discharge fans at the exit provide a volumetric flow rate of 800,000 ft3/min.
Problem #2: Assume that the R134a chiller is turned off such that Qout = 0, but the evaporative coolersystem continues to operate. Determine:a) The exit temperature, T2 (°F)b) The mass flow rate dry air through the system (lbm/sec).c) The rate of liquid water resupply required for continuous operation (lbm/hour).
Define a near-azeotropic refrigerant blend, and give two examples.
Chapter 10 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 10 - How can liquid refrigerant be added to the...Ch. 10 - How is the refrigerant cylinder pressure kept...Ch. 10 - Why does the refrigerant pressure decrease in a...Ch. 10 - What type of equipment normally has the...Ch. 10 - Why are digital scales preferred over other types...Ch. 10 - How does a graduated cylinder account for the...Ch. 10 - What methods besides weighing and measuring are...Ch. 10 - Two or more refrigerants combined together to...Ch. 10 - Define temperature glide, and give examples of...Ch. 10 - A portion of a refrigerant blend that is...
Ch. 10 - What is the main difference between a zeotropic...Ch. 10 - What is meant by "restricting" liquid refrigerant...Ch. 10 - What causes fractionation in certain refrigerant...Ch. 10 - When should a service technician use the...Ch. 10 - A service technician is charging an...Ch. 10 - A technician takes the following readings on an...
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- Define a near-azeotropic refrigerant blend, and give twoexamples.arrow_forwardDefine a zeotropic refrigerant blend, and give an example.arrow_forward6-The point at which water directly converts into steam is called ___________ A.sensible heat of vaporisation B.latent heat of vaporisation C.saturation point D.critical pointarrow_forward
- The most popular refrigerant used in the past for residential air-conditioning is R- ________.arrow_forwardI. ESSAY/ ENUMERATION 1. GIVE ATLEAST 5 ADVANTAGES AND 5 DISADVANTAGES OF INORGANIC REFRIGERANTS. 2. HOW DOES A REFRIGERANT WORKS IN A REFRIGERATION SYSTEM? 3. DIFFERENTIATE POSITIVE AZEOTTROPES AND NEGATIVE AZEOTROPES IN TERMS OF THEIR APPLICATION IN REFRIGERATION SYSTEMS. 4. THE FOUR MAIN COMPONENTS OF A REFRIGERATION SYSTEM ARE COMPRESSOR, CONDENSER, EVAPORATOR AND AN EXPANSION VALVE. EXPLAIN BRIFLY THE FUNCTION OF EACH COMPONENT AND THE FLOW OF THE CYCLE.arrow_forwardA. What is the effects of different input parameters on evaporator operating pressure. B. How does the change in evaporator pressure affect the process?arrow_forward
- QUESTION 14 An industrial refrigeratot uses (NH3) Ammonia, and a reciprocating compressor. At the begining of compression the refrigerant is dry staurated at 1bar and operates adibatically with index 1.3 and copression ratio 20. At the final stage, the fluid is saturated vapour. Using the prescribed property table, the specific volume after compression is (to 4 d.p) in (unit symbol). The volumetric ratio is (to 4.d.p) and the final specific volume is (to 2 d.p.). The work done on the refrigerant during the process is (to 1 d.p in kilo of unit symbol). The initial specific enthalpy of dry saturated (2 d.p) in (kilo of unit symbol), while that refrigrant is of after compression is (1 d.p) in (kilo of unit symbol) and the initial specific internal energy of dry saturated refrigrant is (2 d.p) in (kilo of unit symbol) then (3 d.p) in (kilo of unit symbol) after compression. The heat transferd per unit mass to the or from the the cylinder walls during the process is (to 2 d.p. in kilo of…arrow_forward9) What is the refrigeration effect?A: It is the energy transfer per kg of refrigerantB: It is the energy transfer per oC of refrigerantC: It is the energy reject per kg of refrigerantD: It is the energy reject per oC of refrigerantarrow_forward7. Clarify the most important characteristics of an ideal refrigerantarrow_forward
- 2. Double-Effect Evaporator with Reverse Feed. A feed rate of 20410 kg/hr of 10 wt % NaOH solution at 48.9 °C is being concentrated in a double-effect reverse-feed evaporator to produce a 50% solution. Saturated steam at 178.3 °C is fed to the first evaporator and the pressure in the second effect is 10.34 kPa abs. The heat-transfer coefficient for each effect is assumed to be 2840 W/m?-K. Calculate the heat-transfer area, the steam consumption rate, and the steam economy.arrow_forwardThe sensible heat that is added to a saturated vapor after all of the liquid has boiled away is referred to as _____.arrow_forwardAre federal excise taxes on reclaimed refrigerants the same as those for new refrigerants?arrow_forward
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