Energy Conservation Equipment

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Question 1

A fixed-plate air-to-air heat exchanger used in an ERV unit _____.

A	transfers sensible heat only
B	transfers latent heat only
C	precools ventilation air in the winter
D	precools ventilation air in the summer

Question 2

A rotary air-to-air heat exchanger that has a(n) _____ wheel media can recover total heat.

A	aluminum
B	Monel®
C	lithium chloride
D	copper

Question 3

A refrigeration system in which the hot discharge gas from the reciprocating compressor can be diverted from the system condenser and into a heat recovery condenser is commonly called a _____.

A	double-bundle condenser system
B	dual-condenser system
C	bypass condenser system
D	heat pump heat reclaim system

Question 4

In a chiller system with a double-bundle condenser, the compressor hot discharge gas can be routed to _____.

A	the cooling condenser
B	the heat recovery condenser
C	neither the heat recovery condenser or the cooling condenser
D	both the heat recovery condenser and the cooling condenser

Question 5

The coils in a runaround loop system are installed in the exhaust duct and supply duct. Installation of the coils in these locations gives _____.

A	no temperature difference between the airstreams flowing in the ducts
B	the minimum temperature difference between the airstreams flowing in the ducts
C	the greatest temperature difference between the airstreams flowing in the ducts
D	a recovery efficiency exceeding 80 percent

Question 6

A heat pipe heat exchanger _____.

A	decreases the dehumidification capacity of a system
B	transfers heat from one end of the exchanger to the other
C	is an active device that needs no electrical energy input
D	operates constantly, regardless of the temperature difference between the airstreams flowing in the supply and exhaust ducts

Question 7

Thermosiphon loops are used when __________.

A	heat exchangers may be enclosed in a single shell
B	the supply and exhaust air ducts are not mounted next to each other
C	the supply and exhaust air ducts must be mounted next to each other
D	gravity cannot be used to transfer energy between two airstreams

Question 8

In an air-side economizer, the changeover from the mechanical cooling mode to the free cooling mode is controlled mainly by the _____.

A	outdoor air enthalpy sensor
B	return air enthalpy sensor
C	space thermostat
D	discharge air sensor

Question 9

In a steam system that uses a heat recovery flash tank _____ the flash tank.

A	high-pressure steam and high-pressure condensate can be piped out of
B	high-or medium-pressure steam condensate can be piped into
C	hot water can be piped into and low-pressure steam piped out of
D	low-pressure steam and high-pressure condensate are piped out of

Question 10

Which of the following statements most accurately describes a utility demand reduction program?

A	Comfort cooling systems are only permitted to operate at night during the summer.
B	The utility charges twice as much for energy during peak demand hours.
C	Office buildings are required to close during peak demand hours.
D	Some comfort air conditioning equipment is turned off during peak demand hours.

Question 11

The three types of airflow in a fixed-plate heat exchanger are _____.

A	counterflow, direct flow, crossflow
B	vertical flow, parallel flow, counterflow
C	crossflow, direct flow, reverse flow
D	parallel flow, crossflow, counterflow

Question 12

The purpose of a heat pipe heat exchanger is to _____.

A	extract sensible heat from the exhaust air
B	preheat the air entering the evaporator
C	remove latent heat from the indoor air
D	provide emergency heat in the event of a compressor failure

Question 13

During the charge cycle of an IceBank® system, _____.

A	the ice banks alone are used to satisfy the cooling demand
B	the chiller capacity is used to make ice
C	the ice bank is used to augment the chiller
D	any leftover ice is melted so the freezing process can start again

Question 14

The purpose of a condenser heat recovery system is to _____.

A	store heat for later use
B	capture heat that is rejected by the condenser
C	extract heat from the refrigerant before it enters the condenser
D	pre-cool air entering the evaporator

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Energy Conservation Equipment

Energy Conservation Equipment

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