Term
| Forced-air systems cost less than hydronic systems to operate and maintain because of the durability and long life of the equipment. |
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Definition
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Term
Far less water than air is needed to distribute the same amount of heat, meaning that hydronic water distribution can use piping that is much smaller than the equivalent air ductwork.
T or f |
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Definition
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Term
For practical purposes, enthalpy may be taken as the sum of sensible heat and latent heat.
T or f |
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Definition
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Term
Heat transfer is the flow of heat from one object or substance to another, and it occurs because of a difference in pressure.
T or f |
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Definition
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Term
Single-wall heat exchangers are less efficient than double-wall heat exchangers of equal size.
T or f |
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Definition
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Term
The compressor pumps the vaporized refrigerant away from the evaporator and discharges it at a higher pressure and temperature into the condenser.
T or f |
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Definition
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Term
| A dry cooling tower is a cooling tower with open water loops, allowing direct contact between circulating water and outside air. |
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Definition
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Term
Rotary pumps discharge fluids in an erratic, pulsating flow.
T or f |
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Definition
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Term
The two most commonly used centrifugal pump sealing methods are the stuffing box seal and the mechanical seal.
T or f |
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Definition
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Term
There are four basic classifications of pumps.
T or f |
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Definition
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Term
In air control management systems, manual air vents are recommended to be installed at terminal units and high piping points.
T or f |
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Definition
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Term
All piping expands when cooled and contracts when heated.
T or f |
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Definition
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Term
A lift valve is a hydronic piping system monitoring device that is equipped with an integral check valve designed to minimize system fluid loss when setting up to monitor pumps, heat exchangers, valves, or other devices handling hot or cold HTF.
T or f |
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Definition
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Term
In a single main system, if proper air control equipment is installed at the heat source, further venting should not be necessary.
T or f |
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Definition
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Term
| A single loop system can serve three circuits. |
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Definition
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Term
| There are two types of convection units, natural convection units, which depend upon natural gravity to circulate the air, and forced convection units, which utilize fans or blowers to move air across the unit's element. T or f |
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Definition
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Term
In most cases, the inlet to a heating coil is on the top of the coil, and the outlet is at the bottom.
T or f |
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Definition
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Term
The term "radiant panel" comes from the type of heat transfer a radiant panel system utilizes.
T or f |
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Definition
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Term
A balancing valve is provided at each circuit in a radiant system, or for each area where the flow of HTF must be controlled, in order to provide equal distribution of heat transfer to each zone.
T or f |
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Definition
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Term
Since airflow through large ducts usually has uniform temperatures even within the duct cross-section, small temperature sensors mounted in one spot are always accurate.
T or f |
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Definition
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Term
The purpose of a control system is to achieve and maintain certain conditions, which are quantified as setpoints.
T or f |
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Definition
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Term
A water loop system circulates water from the chiller condenser to the cooling tower and back to the chiller condenser and is typically an open system.
T or f |
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Definition
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Term
Inspecting is a formal assessment of the functionality and efficiency of a system.
T or f |
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Definition
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Term
When a piping system is sized for heating and cooling, the smaller required flow rate is used for sizing the components of the system.
T or f |
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Definition
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Term
In one-pipe primary-secondary systems, the terminal units are located on secondary circuits that are in parallel with the main or primary circuit.
T or f |
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Definition
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Term
| Since the greatest amount of body heat is lost by __ it is logical that the system that most satisfactorily controls this loss is best able to create a comfort condition. |
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Definition
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Term
A typical modern hydronic heating and cooling system is divided into _ main parts?
2,3,4,5? |
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Definition
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Term
Temperature is an indirect measure of the ____
attained by the molecules in a
substance and is a measure of the intensity of heat.
Density, mass, velocity, depth? |
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Definition
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Term
When a vapor is heated to a temperature higher than its boiling point, it is said to be ___?
Saturated, steamed, hot af, superheated? |
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Definition
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Term
The hydronic cooling cycle is composed of ___ separate and distinct cycles that create the complete hydronic cooling system.
2,3,4,5? |
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Definition
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Term
31. A ___cooling tower is a cooling tower in which the water and ambient air are introduced at the top of the tower and flow downward through the fill.
Crossflow, parallelflow, direct flow? |
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Definition
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Term
A ____ valve is a valve that permits fluid flow in only one direction and closes automatically to prevent backflow.
Ball, check, balancing? |
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Definition
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Term
| ____ is the flashing of pumped liquid into vapor bubbles and the subsequent violent collapsing of those bubbles as the liquid moves from suction to discharge through a pump. |
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Definition
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Term
When determining the best location for air separators, the point of ____ should receive first consideration.
High temp, low temp, high pressure? |
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Definition
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Term
As pressure drops occur within a system, dissolved gases are released and can form bubbles when the HTF reaches a low ___?
Density, static pressure, temp? |
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Definition
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Term
| The major difference between copper tube and copper pipe is method of sizing because ___? |
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Definition
| Tubing cannot be threaded |
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Term
A ___is a fitting that creates a greater-than-normal pressure drop in a line in order to divert flow to another line.
3 elbow swing, coupling, diversion fitting? |
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Definition
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Term
The ___ line is the section of the main in a multiple circuit system that carries the
combined capacity of the circuits.
Main, trunk, branch, primary? |
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Definition
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Term
A ___ hydronic system is used where the terminal units, such as unit heaters and
convection units for heating and cooling, have very high pressure drops.
1 pipe, 2 pipe, 3 pipe, 4 pipe? |
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Definition
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Term
In___ is when two or more circuits or branches have a common starting and ending point.
Parallel, unison, combination? |
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Definition
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Term
A ___convection unit is a convection terminal unit that creates convective currents by mechanically moving air past a terminal unit element.
Cabinet, forced air, radiant? |
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Definition
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Term
As chilled water temperatures increase, less moisture condenses out of the air, and the RH ___?
Decreases, balances, increases? |
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Definition
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Term
Radiant panels release 50% to 70% of their heat to a room by radiation and provide the balance of the heat by ___?
Conduction, convection, enthalpy? |
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Definition
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Term
__ value is the measure of thermal resistance of a material or product?
T, M, Jesse value, R |
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Definition
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Term
___ sensors are the most common inputs used in hydronic control systems?
Flow, pressure, Temperature, differential? |
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Definition
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Term
From the point of view of the controller, ___ are output devices.
Sensors, actuators, control signals? |
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Definition
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Term
When preparing to start a hydronic system for the first time, review the job specifications to determine the testing, ___ and adjusting work required and the requirements for reporting the results.
Charging, balancing, pressurizing |
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Definition
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Term
System maintenance should include a ___ inspection of piping and HTF by the property owner or facility manager.
Daily, weekly, monthly, yearly? |
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Definition
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Term
___ head is a function of the weight of HTF and the vertical height of the HTF in the system above a pump.
Total, static, friction, pressure |
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Definition
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Term
When one pump is used with multiple piping circuits, the piping circuit with the
___ is used to size the pump. |
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Definition
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Term
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Definition
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