Quiz
Chapter 11 - Quiz
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Perguntas do quiz (20)
1A zone is any area of a building for which indoor air temperature is controlled by a single thermostat (or other type of temperature controller).
- AVerdadeiro
- BFalso
2Different rooms within a single zone (e.g., controlled by a single thermostat) and supplied with the same water temperature cannot be maintained at different temperatures by adjusting the flow rate through individual heat emitters.
- AVerdadeiro
- BFalso
3If the heat emitters are connected in series , the system flow rate will pass through each heat emitter. If the heat emitters are connected in parallel, the flow rate through each heat emitter can be proportioned based on load using an equation.
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- BFalso
4Given the surface area of their bodies, hydraulic separators should be insulated to minimize heat loss to their surroundings.
- AVerdadeiro
- BFalso
5Designers should think of hydraulic separation as a physical concept that must be accomplished as an all-or-nothing condition.
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- BFalso
6When a circulator with the flat curve is used, the differential pressure across the circulator changes dramatically as zone circuits turn on and off.
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7The electronically commutated motors and improved hydrodynamic design of current generation variable-speed pressure-regulated circulators provide wire-to-water efficiencies that are approximately double those of standard wet-rotor circulators with permanent split capacity.
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8If a fixed-speed circulator is selected, a differential pressure bypass valve should be installed to reduce the potential for flow noise when only one or two zones are active.
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9Over the last two decades, many heating professionals have come to recognize the failure of PEX and PEX-AL-PEX tubing as universal piping materials for residential and light commercial hydronic systems.
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10Primary/secondary (P/S) piping is the only way to achieve hydraulic separation between simultaneously operating circulators.
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11The time required to cool down or warm up a zone is significantly affected by the __________ of the heat emitter(s), and the building itself.
- Athermal envelope
- Bthermal mass
- Cambient temperature
- Dsetpoint temperature
12All hydronic systems, regardless of how they are designed or installed, attempt to simultaneously stabilize at two unique operating conditions called thermal equilibrium and __________ equilibrium.
- Aspatial
- Bhydraulic
- Czoning
- DR-value
13In a technique known as __________, the designer repeatedly analyzes both the hydraulic and thermal performance of a system using "candidate" hardware options and operating conditions, until a combination is found that yields acceptable heat distribution.
- Atrial and error
- Bselective pairing
- Celimination
- Diteration
14Ideally, each circulator in a system will establish a differential pressure and flow rates that is unaffected by the presence of another operating circulator within the system. This very desirable condition is called __________.
- Ahydraulic equilibrium
- Bhydraulic separation
- Cthe pump curve
- Dideal circulation
15The degree to which two operating circulators interact with each other depends on the head loss of the piping path they have in common. This piping path is called the __________ piping.
- Acirculatory
- Bserpentine
- Chead loss
- Dcommon
16The purpose of differential pressure bypass valves (DPBV) is to _________ the differential pressure imposed on the distribution system by a fixed-speed circulator as the system flow rate decreases due to closing zone valves.
- Aaccelerate
- Bequalize
- Climit
- Dincrease
17One approach that takes advantage of the flexibility of PEX or PEX-AL-PEX tubing is called a __________ distribution system.
- Ahydroplastic
- Bhome run
- Chybrid
- Dgreen
18The closely spaced tees connecting a secondary circuit to the primary circuit are __________ when air is being purged from the system.
- Acounterproductive
- Binstrumental
- Cessential
- Dirrelevant
19The concept of __________ provides a means by which the electrical energy consumption of a distribution system, per unit of heat delivery capacity, can be calculated and compared.
- Ahydraulic separation
- Bhydraulic equilibrium
- Cthermal envelope
- Ddistribution efficiency
20The diverse loads served by many modern residential and light commercial systems often dictate that the distribution system contains elements from __________ of the basic distribution systems discussed in this chapter.
- Aone specific
- Btwo or more
- Cat least three
- Dpossibly none
Informações
- Descrição
- Distribution Piping Systems
- Autor
- Neil Revollo
- Idioma
- English
- Visualizações
- 491
- Etiquetas
- Avaliação
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