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One of the most important properties of water relevant to its use in hydronic systems is specific heat.
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If the material changes phase while absorbing heat, its temperature will change.
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The specific heat of water is high in comparison to other common materials. In fact, water has one of the highest specific heats of any known material.
Frage 4
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The difference in heat capacity of water versus that of air is the single greatest advantage of using water rather than air to convey heat.
Frage 5
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The density of water is not dependent on temperature.
Frage 6
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It is often necessary to determine the quantity of heat stored in a given amount of material that undergoes a specific temperature change. An equation known as the sensible heat quantity equation, can be used for this purpose.
Frage 7
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The quantity of heat absorbed or released from the material is expressed as Btu/hr.
Frage 8
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The rate of heat transfer into or out of the fluid stream in equations is expressed as Btu.
Frage 9
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The vapor pressure of a liquid is the minimum pressure that must be applied at the liquid's surface to prevent it from boiling.
Frage 10
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When hydronic systems are first filled with water, dissolved air is present in the water throughout the system.
Frage 11
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The heat absorbed or released by a material while it remains in a single phase is called __________ heat.
Antworten
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radiant
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sensible
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ambient
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latent
Frage 12
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If the material changes phase while absorbing heat, its temperature does not change. The heat absorbed in such a process is called ________ heat.
Antworten
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radiant
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sensible
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ambient
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latent
Frage 13
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Although it is not a defined scientific term, it could be said that water is almost _________ times more "thermally concentrated" than air.
Frage 14
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Hydronic system designers often need to know the __________ of heat transfer to or from a stream of water flowing through a device such as a heat source or heat emitter.
Antworten
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rate
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temperature
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thermal mass
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exact volume
Frage 15
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The ___________ pressure of a liquid is the minimum pressure that must be applied at the liquid's surface to prevent it from boiling.
Antworten
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surface
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mean
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vapor
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systemic
Frage 16
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The viscosity of a fluid is an indicator of its resistance to __________.
Antworten
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flow
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heat
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combining
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displacement
Frage 17
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The amount of air that can exist in solution with water is strongly dependent on the water's temperature. As water is heated, its ability to hold air in solution __________.
Antworten
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rapidly increases
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remains constant
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is viscosity dependent
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rapidly decreases
Frage 18
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When a quantity of liquid water is put under pressure, there is __________ change in its volume.
Antworten
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a significant
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very little
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a corresponding
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a formulaic
Frage 19
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The total liquid flow rate entering any portion of a fluid-filled (non-leaking) piping assembly will __________ the total flow rate exiting that assembly.
Antworten
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always equal
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never equal
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might equal
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approximate
Frage 20
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Incompressibility implies that liquids can exert tremendous pressure in any type of filled and closed container when they __________ due to heating.
Antworten
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contract
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dissolve
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expand
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vaporize