Hydronics 1

In a hydronic system, boiler water temperature is usually maintained at ___ so heat can be immediately delivered to the tank.

180°F to 200°F

___ are powered by electricity and use refrigerants to cool the air.

Air conditioners

If the boiler is located in the basement of a multi-story building, what should the PRV be set as if it is using water as the HTF? The gauge is located 70 feet below the highest elevation.

Approximately 35 psig

Forced-air systems cost less than hydronic systems to operate and maintain because of the durability and long life of the equipment.

False

In early civilizations, cooling techniques included using natural shading from the sun, such as building on the south side of slopes or trees.

False

Industrial and commercial use of steam heating is still common today.

True

Original hydronic systems used baseboard hydronic units for heating, with cooling supplied by a water chiller and fan coil unit distributing cool air through short ducts to each room.

True

The objective of any building heating or cooling system, including a hydronic system, is to provide the maximum human comfort possible.

True

Zoning is particularly important in multilevel homes and large buildings.

True

A good example of outdoor reset used for coils (unit heaters, convector baseboard, AHU's, etc) is _______________.

When outside air temperature is 0 degrees F, the HTF will be at 180 degrees F.

Hydronic system equipment that is normally installed in a mechanical room includes ___.

a chiller or other method to create chilled HTF

The three ways that domestic water can be heated using the same boiler that supplies the hydronic system are with a ____________________, with an additional heat exchanger, or with an indirect-fired water heater installed in the boiler.

combination boiler

Examples of ___ units are unit heaters and fan coil terminal units

forced convection

There are ____________________ basic hydronic distribution types.

four

A ___ hydronic system is a hydronic system in which circulation to the heating units is accomplished by the difference in the density of water in the supply and return mains.

gravity

In the early 1900s, closed hydronic systems were still gravity-based systems that relied on the ___ in the system to circulate the water and were slow to affect temperature change in the building.

high pressures and temperatures

A(n) ____________________ system is a heating and/or cooling system that uses water or another fluid as a heat transfer medium to move heat from one area to another.

hydronic

The temperature of the supply HTF from the boiler is sometimes controlled automatically according to the outside temperature using a ____________________ control system.

master-submaster

Far less water than air is needed to distribute the same amount of heat, meaning that hydronic water distribution can use piping that is ___ the equivalent air ductwork

much smaller than

A(n) ____________________ hydronic system is a hydronic system that is, at some point, open to the atmosphere.

open

A distribution system includes ___.

piping and fittings to transport the HTF

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.

radiation

Hydronic heating and cooling is efficient because the ___ of water circulating through the system is automatically increased or decreased to meet varying weather conditions.

temperature

A typical modern hydronic heating and cooling system is divided into ___ main parts

three

Every terminal unit, regardless of type or whether directly or indirectly installed, requires ___.

union connections to attach the terminal unit to distribution piping