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 50, Problem 15RQ
Explain why the outside air damper is typically never completely closed, even when the outside air conditions are not adequate to provide free-cooling.
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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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- 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.arrow_forwardWhy is information regarding the specific volume of gases important to the designer of air-conditioning, heating, and refrigeration equipment?arrow_forwardWhich component is primarily responsible for the pressure in a cooling system? Select one: a. The thermostat b. The water pump c. The radiator cap d. The surge tankarrow_forward
- (b) Bathroom sinks and some other fixtures include an overflow opening in the basin. This opening is located on the wall and near the top of the basin. The overflow opening serves two important functions: If the water tap is left on while the drain stopper is closed, the opening will channel water down into the drain opening rather than letting is spill out of the sink onto the floor. The overflow allows the sink to drain faster by introducing air into the system. A sink with a dimension given in Figure Q2(b), has water flows into it at a rate of 8 L/min. If the drain stopper is closed and water level in the sink remains constant, determine the average velocity of water flows through the 3.0 cm diameter overflow hole. Front 3 cm diameter overflow holes Q-8 L/min 15 3/4| 40 cm 15 cm Side (a) Figure Q2: (a) Picture of the sink; (b) Sink dimension (Ь)arrow_forwardWrite a detailed theory for cooling towers :energy balance, the objective being to energy balance of the system, that is to say, the energy taken by the air must be equal to the energy supplied by water flow.arrow_forwardWhat advantage might the commercially packaged coolant material have over ice other thanit produces less mess?arrow_forward
- Which one of the following statement is correct? * O evaporative cooling and sensible cooling is the same O evaporative cooling is not effective for hot and dry climates O evaporative cooling is a cooling and dehumidification process O evaporative cooling is a cooling and humidification processarrow_forward5. What are the features of the central air conditioning system? 6. What are the disadvantages of using central air conditioning?arrow_forwardDefine absolute humidity and relative humidity. When an air conditioner is operated insummer, lots of water needs to be drained out from it. Briefly explain this situation inrelation to psychrometry.arrow_forward
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