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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Chapter 50, Problem 12RQ
Free-cooling can be accomplished if the
A. enthalpy of the return air is lower than the enthalpy of the outside air.
B. enthalpy of the outside air is lower than the enthalpy of the return air.
C. enthalpy of the return air is lower than the enthalpy of the supply air.
D. enthalpy of the return air is the same as the enthalpy of the outside air.
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Chapter 50 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 50 - Which of the following is true regarding the...Ch. 50 - Which process would best represent the opposite of...Ch. 50 - Mixed air is best described as the combination of...Ch. 50 - Which of the following should be taken into...Ch. 50 - A bonded roof is one that has A. reinforced steel...Ch. 50 - Properly installed roof curbs will reduce the...Ch. 50 - When rigging a unit to the roof, what minimum...Ch. 50 - What is the acceptable method for communicating...Ch. 50 - Prob. 9RQCh. 50 - Prob. 10RQ
Ch. 50 - The most efficient way to establish the best...Ch. 50 - Free-cooling can be accomplished if the
A....Ch. 50 - Prob. 13RQCh. 50 - Prob. 14RQCh. 50 - Explain why the outside air damper is typically...Ch. 50 - Briefly explain the purpose of ASHRAE Standard 62.Ch. 50 - Explain the concept of demand control ventilation.Ch. 50 - Explain how carbon dioxide levels can be used to...Ch. 50 - Describe the blowers used on VAV systems.Ch. 50 - A cooling-only VAV box has all of the following...Ch. 50 - Which of the following is true regarding a reheat...Ch. 50 - Variable refrigerant flow systems sense the...Ch. 50 - The acronym PID stands for ______, _____, and...Ch. 50 - Explain the main benefit of a heat-recovery VRF...Ch. 50 - The pump on a dry cooler can direct water to...Ch. 50 - During low ambient conditions, the space cooling...
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- What causes fractionation in certain refrigerant blends?arrow_forwardWhat would operating an engine with 100% water in the cooling system cause? Select one: a. Corrosion of the metal parts in the cooling system b. Premature hose deterioration c. Engine overheating d. Loss of heat in the passenger compartmentarrow_forwardEnthalpy of vaporisation is equal to __________at critical point. A. saturation temperature B. zero C. saturation point D. saturation pressurearrow_forward
- PLEASE DO NOT USE PSYCHROMETRIC CHART. THANK YOU 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).arrow_forwardWhat is "isothermal compression" and its definition in practise ? Please choose correct option. a. It is a compression during which temparature of the air is kept constant. Compression process should be done very slowly to allow any heat to transfer to the surrounding medium. b. It is the expansion of air in a motor, during which it is heated and given extra energy. c. It is the periodic compression and expansion of a gas in a compressor as to load and unload energy to it. d. It is the compression of air in a compressor, which is neither running too fast or too slow, suitable for practical purposes. e. It is the compression of air in a heat-insulated cylinder, but compression should be very slow.arrow_forwardWhich of the following statement(s) is(are) correct? Group of answer choices A. N B. The pressure, volume, and temperature of the steam are not connected by simple equations unlike ideal gases. C. An irreversible adiabatic process is a constant entropy process. D. The vaporization process of steam is isobaric in nature. E. The general energy equations for ideal gas are analogous to the equations for the processes of vapors.arrow_forward
- Recirculated air from the indoor space is 7,500 cfm (75 degrees F dry bulb, 50% RH). Ventilation air from outdoors is 2,500 cfm (95 degrees F dry bulb, 76 degrees F wet bulb). Leaving air off the cooling coil is 10,000 cfm (55 degrees F dry bulb, 90% RH). What is the wet bulb temperature of the indoor air that is being recirculated? Group of answer choices 61.5 degrees 63.5 degrees 62.5 degrees 61 degreesarrow_forwardHow can we calculate air enthalpy change?arrow_forwardAs the Airstream is cooled and dehumidified, the relative humidity____ and the absolute humidity___ A. Increases , Increases B. Decreases, Decreases C. Increases, decreases D. Decreases, Increasesarrow_forward
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