Explanation Purging is the process if accumulation of unwanted fumes, flue gases or the dust in every last heat cycle of exchanger. It may block the heat exchanger tube. Blockage will decrease the efficiency of the system and increase the cost. These gases or fumes must be removed before each heat cycle in the heat exchanger...

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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Heat Exchangers

Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.

Heat Exchanger

The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.

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Chapter 31, Problem 43RQ

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Prepurging a heat exchanger.

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Chapter 31, Problem 42RQ

Chapter 31, Problem 44RQ

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Chapter 31 Solutions

Refrigeration and Air Conditioning Technology (MindTap Course List)

Ch. 31 - The four types of gas furnace airflow patterns are...Ch. 31 - Describe the function of a multipoise or...Ch. 31 - Describe the function of a draft safeguard switch.Ch. 31 - Where are auxiliary limit switches used in heating...Ch. 31 - The specific gravity of natural gas is A. 0.08. B....Ch. 31 - Prob. 6RQ Ch. 31 - The pressure at the manifold for natural gas is...Ch. 31 - Prob. 8RQ Ch. 31 - The typical manifold pressurefor propane gas...Ch. 31 - Why is excess air supplied to all gas-burning...

Ch. 31 - Prob. 11RQ Ch. 31 - True or False: All gas valves snap open and...Ch. 31 - Which of the following features does an automatic...Ch. 31 - What is the function of the servo pressure...Ch. 31 - What is a redundant gas valve?Ch. 31 - Prob. 16RQ Ch. 31 - Prob. 17RQ Ch. 31 - Prob. 18RQ Ch. 31 - Prob. 19RQ Ch. 31 - What is an integrated furnace controller (IFC)?Ch. 31 - What is meant by the warm-air blower's off-delay...Ch. 31 - What are dual-in-line-pair (DIP) switches?Ch. 31 - Prob. 23RQ Ch. 31 - Describe the two types of pilot lights.Ch. 31 - True or False: A thermocouple develops direct...Ch. 31 - Describe how a thermocouple flame-proving system...Ch. 31 - Prob. 27RQ Ch. 31 - Describe how a liquid-filled flame-proving system...Ch. 31 - Prob. 29RQ Ch. 31 - Describe a flame rectification flame-proving...Ch. 31 - Prob. 31RQ Ch. 31 - Describe the difference between a single-rod...Ch. 31 - Prob. 33RQ Ch. 31 - Prob. 34RQ Ch. 31 - Prob. 35RQ Ch. 31 - Prob. 36RQ Ch. 31 - Define the dew point temperature as it applies to...Ch. 31 - Prob. 38RQ Ch. 31 - Prob. 39RQ Ch. 31 - What are four factors that determine the...Ch. 31 - What is a 100% shutoff system?Ch. 31 - What is the difference between a hard and a soft...Ch. 31 - Prob. 43RQ Ch. 31 - When would a combustion blower ever interpurge a...Ch. 31 - Prob. 45RQ Ch. 31 - An orifice is a drilled hole in a _______.Ch. 31 - A______ distributes gas to the various burners.Ch. 31 - True or False: An orifice measures the quantity of...Ch. 31 - Prob. 49RQ Ch. 31 - The ________transfers heat from the hot gas to the...Ch. 31 - Name two types of fan switches.Ch. 31 - Prob. 52RQ Ch. 31 - Prob. 53RQ Ch. 31 - Describe how a two-stage furnace operates.Ch. 31 - Describe how a modulating furnace operates.Ch. 31 - What is a variable-output programmable thermostat?Ch. 31 - Why is a metal vent often preferred rather than a...Ch. 31 - Prob. 58RQ Ch. 31 - Describe why you should never use a flame to leak...Ch. 31 - Prob. 60RQ Ch. 31 - A _____________sample is taken from the flue gas...

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Prepurging a heat exchanger.

Solution Summary: The author explains that prepurging a heat exchanger is the process of removal of accumulated gases, Fumes or the dust during every heat cycle.

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