Hydronic Heating

Front 1

Actuator

Back 1

An electrically or pneumatic ally controlled driven device that adjust the position of a valve stem or damper based on the signal it receives from a controller

Front 2

Air change method

Back 2

Expressing the rate of air leakage into a building.

Front 3

Air binding

Back 3

Inability of circulator to dislodge a large air pocket at a high point in a piping system

Front 4

Air film resistance

Back 4

Thermal resistance of air film along a wall, ceiling or floor surface

Front 5

Air handler

Back 5

Device consisting of a blower and finned tube coil. Used either heat or cool the air passing through it based on temperature of the fluid circulating through the tubes of a coil

Front 6

Air infiltrated

Back 6

Process of outside air entering a building as inside air leaks out of building

Front 7

Air purger

Back 7

Device that separates air bubbles from movies system fluid and ejects them from the system

Front 8

Air vent

Back 8

Manual or automatic device that releases ai bubbles from piping system

Front 9

Aquastat

Back 9

Electromagnetic switch that measure temperature of a liquid at some point in the system and opens or closes electrical contact based on temperature and set point temperature

Front 10

Balancing

Back 10

Process of adjusting flow in multiple circuit system

Front 11

Boiler feed valve

Back 11

Pressure reducing valve that maintain the system at a set pressure and automatically fill the system if pressure drops

Front 12

Boiler reset control

Back 12

Smart controller that automatically changes water temperature of system based on outdoor temperature

Front 13

Brine

Back 13

Anti freeze solution contain water and glycols

Front 14

BTU

Back 14

Amount of energy required to raise one pound of water one degree Fahrenheit

Front 15

Buffer tank

Back 15

Insulated storage tank indirectly connected to the heat source

Front 16

By pass loop

Back 16

Piping circuit where water flows directly back to the heat source

Front 17

Calorific value

Back 17

Amount of energy released by burning specific unit of volume

Front 18

Check valve

Back 18

Allows flow in one direction

Front 19

Chiller

Back 19

Decide that operated based on refrigeration cycle to create chilled water usually for building cooling purposes

Front 20

Circuit

Back 20

Piping arrangements allows fluid to flow from boiler supply through heat emitter and return back to boiler

Front 21

Circulator

Back 21

Pump that creates flow in hydronic system by creating pressure differential

Front 22

Circulator controller system

Back 22

Multi zoned system where different zones are controlled by turning dedicated circulators on and off

Front 23

Closely spaced tees

Back 23

Two tees installed close to each other order to create hydraulic separation when multiple circulator installed in a system

Front 24

Compressor

Back 24

Device which refrigerant gas is compressed in volume and simultaneously increased in temperature

Front 25

Condensate

Back 25

Liquid resulting when vapour is cooled below dew point

Front 26

Condenser

Back 26

Component in refrigerant system that transfer heat from system fluid by condensing the refrigerant

Front 27

Conduction

Back 27

Transfer of heat through vibration of molecules. Mis the in contact with each other

Front 28

Covnection

Back 28

Transfer of heat from one place to another by movement of molecules caused by changes in densities of liquid or gas

Front 29

Conventional boiler

Back 29

Gas fired boiler that not intended to operate with sustained condensation of flue gases

Front 30

Closed system

Back 30

Hydronic system completely closed off from atmosphere

Front 31

Dead heading

Back 31

Condition where flow created by a circular is completely blocked

Front 32

Delta T

Back 32

Difference in temperature between supply water and return water of boiler or secondary circuit

Front 33

Dew point

Back 33

Temperature where water vapour in mixture of gases begin to condense into water droplets

Front 34

Distribution system

Back 34

Assembly of fittings,piping and valves that distributes heater water from heat source to heat emitters

Front 35

Diverted valve

Back 35

Valve that will direct incoming water into one of two possible directions

Front 36

Domestic hot water

Back 36

Heated water used to purposes of cooking washing or human consumption

Front 37

Dry base boiler

Back 37

Boiler where entire heat exchanger located above the combustion chamber

Front 38

Efficiency

Back 38

Ratio of energy output divided by amount of energy input

Front 39

Electromechanical controls

Back 39

Controls that use mechanical components

Front 40

Expansion tank

Back 40

Device designed to accommodate for expansion of water as it heated

Front 41

Fan coil

Back 41

Heat emitter containing a fined tube coil and a fan to create forced convection in heated space

Front 42

Feet of head

Back 42

Unit of measure that express the head energy of a fluid

Front 43

Finned tube baseboard

Back 43

Heat emitter made up of copper tube with aluminum fins that mounted on the wall

Front 44

Flow check valve

Back 44

Check valve that prevents backflow as well as forward migration due to buoyancy of hot water

Front 45

Flow coefficient

Back 45

Dow rate in gallons per min of 60f water needed to create a pressure drop of 1PSI across piping component or valve

Front 46

Flow rate

Back 46

Volumetric rate of flow of a fluid

Front 47

Flow switch

Back 47

Electromechanical switch that opens or closes a set of contacts when this is flowing through it

Front 48

Flow velocity

Back 48

Speed at which fluids travels within the system. Unit of measure feet per second

Front 49

Heat anticipator

Back 49

Adjustable resistor integral to a electromechanical room thermostat used to minimize overshoot

Front 50

Heat exchanger

Back 50

Device that transfer heat from fluid to another that doesn’t allow the two fluids to contact each other

Front 51

Heat emitter

Back 51

Device that is designed to exact heat from system fluid and transfer it to be heated

Front 52

Heat pump

Back 52

Device that uses refrigerant cycle to move heat from an area of lower temperature to one of higher

Front 53

Heat sink

Back 53

Material or area that absorb heat from system

Front 54

Heat source

Back 54

Device to supply heat to building

Front 55

High limit setting

Back 55

Upper temperature limit set on a temperature controller

Front 56

Home run distribution

Back 56

Distribution system that uses supply and return manifold and each circuit receives dedicated supply and return piping

Front 57

Hydraulic equilibrium

Back 57

Condition where the head energy created by a circulator is equal to head lost in a system due to friction losses in piping

Front 58

Hydraulic separation

Back 58

Device to allow circulators to operate independent of each other

Front 59

Impeller

Back 59

Rotation disc with vanes within a circulator

Front 60

Indirect water heater

Back 60

Insulated storage tank that contains an internal head exchanger. Water in the tank is heating by heated system water

Front 61

Infiltration

Back 61

Unintentional leakage of outside air into heated space

Front 62

Injection mixing

Back 62

Method of controlling water temperature to an area by adding hot water to a circuit and simultaneously removing cold water

Front 63

Laminar flow

Back 63

Condition when system fluid streamlines are parallel as travel through the piping

Front 64

Latent heat vs sensible heat

Back 64

Latent is heat added or removed when substance changes state while sensible is heat the is measure by a Change in temperature when it is added for removed

Front 65

Load

Back 65

Heating requirement for building room or storage tank

Front 66

Low water cut off

Back 66

Safety control switch that de-energize the burner circuit when water level on system drops helper certain point

Front 67

Mean radiant temperature

Back 67

Average temperature of all surfaces in a room

Front 68

Manifold

Back 68

Piping component that serves as common beginning or end like for multiple circuits

Front 69

Mechanical energy

Back 69

Total kinetic energy of an object or substance

Front 70

Microbubble resorber

Back 70

Type of air separator that captures micro bubbles from the system duos by use of coalescing mesh

Front 71

Mixing valve

Back 71

Device used to blend hot and cold water tot reach desired outlet supply temperature

Front 72

Modulating

Back 72

Ability to heat source or valve to operate within an output range and will continuously adjust to meet the current load

Front 73

Mod/con boiler

Back 73

Boiler designed to withstand sustained condensation of flue gases and also modulate the output of the boiler to match the demand of the heating system

Front 74

Multi zone systems

Back 74

System designed to have independently controlled areas through you a building and have varying room temperature

Front 75

Normally closed contacts

Back 75

Electrical contact in reply or switch that are closed under not operating conditions

Front 76

Normally open contacts

Back 76

Electrical contacts in replay or switch that are open under not operating conditions

Front 77

Outdoor reset control

Back 77

Control for hydronic system that will vary the water temperature dependent on the outdoor temperature

Front 78

Overshoot

Back 78

Condition where actually controlled temperature rises above the set point temperature due to residual heat from the system

Front 79

Packaged boiler

Back 79

Boilers that are solid with majority of components pre mounted

Front 80

Panel radiator

Back 80

Heat emitter that can be mounted on wall or ceiling and the majority of heat it emits is by thermal radiation

Front 81

Point of no pressure change

Back 81

Point where expansion tank is connected to system

Front 82

Primary/secondary

Back 82

Piping arrangements used when multiple circuits are required

Front 83

Priority

Back 83

Control strategy that dedicated the entire heat output from the heat source to own load regardless of multiple zones are calling for heating

Front 84

Relay

Back 84

Electrically operated switch

Front 85

Relay

Back 85

Electrically operated switch

Front 86

Setback

Back 86

Reducing temperature set point in effort to conserve energy

Front 87

Stratification

Back 87

Natural tendency of warm air to settle near the ceiling and cool air to settle near the floor due to different densities

Front 88

Stratification

Back 88

Natural tendency of warm air to settle near the ceiling and cool air to settle near the floor due to different densities

Front 89

Thermal expansion

Back 89

Materials to expand or contract when heated or cooled

Front 90

Thermal equilibrium

Back 90

Condition in a system where heat lost from a room is equal to head added to a room

Front 91

Thermal equilibrium

Back 91

Condition in a system where heat lost from a room is equal to head added to a room

Front 92

Ton

Back 92

Equals to 12,000 btu/hr

Front 93

Transformer

Back 93

Electrical decide that reduce or increase voltage in an AC circuit

Front 94

Cavitation

Back 94

Formation of vapor pockets when pressure on liquid drops below vapor pressure

Front 95

Hydraulic separator

Back 95

Allows circulator to operate independently from one another