Deck 14: Auxiliary Loads and Specialized Topics

Question 1

With a centralized hydronic heating system, cost allocation is handled by measuring the total thermal energy transferred to each space on a periodic (usually monthly) basis.This approach is called heat metering, or, more commonly in North America "____."

A) climate control
B) BTU Metering
C) shared metering
D) central bookkeeping

Answer 1

B

Question 2

One way of initiating several short on/off cycles is by adding thermal mass to the distribution system using an insulated buffer tank.

Answer 2

False

Question 3

As a rule, the piping and circulator, as well as the thermal rating of the tank's heat exchanger should be able to ____ heat as fast as the boiler, or other heat source, can produce it.

A) transfer
B) exchange
C) store
D) distribute

Answer 3

A

Question 4

For garage heating, radiant slab heating is the least efficient in situations where a relatively constant temperature will be maintained.

Question 5

It is often necessary to adjust valves within each branch to achieve flow rates equal or close to those necessary for proper heat delivery.This process is called "____" the system.

A) balancing
B) regulating
C) adjusting
D) pressuring

Question 6

An indirect water heater is an insulated storage tank that produces its own heat, as does a typical direct-fired water heater.

Question 7

Buffer tanks are always needed when the system contains several small individually controlled loads that have low thermal mass.

Question 8

The dominant heat loss from pools is caused by evaporation of water.

Question 9

Domestic hot water (DHW) is by far the most common auxiliary load to be combined with hydronic space heating.

Question 10

When low mass on/off heat sources are combined with extensively zoned distribution systems, it is possible for the heat source to ____ when only one or two zones operate.

A) bind up
B) not respond
C) overcompensate
D) short-cycle

Question 11

One method of providing domestic hot water using a boiler, which was widely used in older North American hydronic systems, was to insert a copper heat exchanger called a ____ into the upper portion of the boiler.

A) flat plate
B) plate and frame
C) tankless coil
D) coil and shell

Question 12

The author's position is that antifreeze must be used in all hydronic garage heating applications.

Question 13

An advantage of snow and ice melting systems (also know as SIM systems) is the ability to use almost any fuel or heat source to provide the energy needed to operate the SIM system.

Question 14

A pool heat exchanger is piped into the system as a(n) ____ branch circuit.

A) indirect
B) parallel
C) series
D) hydraulic

Question 15

Many auxiliary loads require a transfer of heat from the hot water released by a boiler or other heat source to some other liquid operating at a lower temperature.Such situations require the use of a ____.

A) counterflow
B) heat exchanger
C) hydraulic interface
D) thermal plate

Question 16

Most manufacturers of indirect water heaters provide two types of rating information.One is called the first hour rating; the other is called the ____ rating.

A) thermal mass
B) hydraulic pressure
C) head
D) continuous flow

Question 17

One benefit of an indirect water heater is that the stored water provides ____ that allows the boiler to operate for longer cycles, and thus at higher efficiencies.

A) hydraulic pressure
B) heat interface
C) thermal circulation
D) thermal mass

Question 18

Hydronic snow and ice melting systems (also know as SIM systems) use ____ tubing embedded in pavements to melt snow and ice.

A) copper
B) stainless steel
C) aluminum
D) PEX or PEX-AL-PEX

Question 19

A minitube distribution system designed to take advantage of the large temperature difference available between hot boiler water and the relatively cool water returning from a heated slab-on-grade floor.

Question 20

Although space heating is the primary load, hydronic systems can also provide heat to other auxiliary loads.Examples include domestic water heating, garage heating, pool or spa heating, and snow melting.