首页
登录
职称英语
Water for your home is heated by electricity or by gas. In either case, the w
Water for your home is heated by electricity or by gas. In either case, the w
游客
2025-01-05
12
管理
问题
Water for your home is heated by electricity or by gas. In either case, the way in which the water circulates to and through a modern heater is the same. Cold water enters through pipe in the top of the tank. The pipe, which extends almost to the bottom of the tank, ’is called a dip tube or drop tube.
As the cold water is discharged from this tube into the bottom of the tank, it is heated by electric elements or a gas burner. Hot water, being lighter in weight than eold water, rises to the top of the tank where it is drawn off through an outlet tube to faucets and appliances that use hot water.
Whether water is heated by electricity or gas, the temperature of the water is controlled by a thermostat that "senses" temperature. As water heat reaches a preset temperature, the thermostat responds by closing the switch that allows the electric current to flow. When water falls below the preset temperature, the heating elements are turned back on.
About Electrically Operated Units
Two types of electrically-operated, water heaters prevail: induction and immersion.
As the term indicates, an induction type heats water by inducting heat from an electric coil. The electric coil does not come into contact with the water. Instead, the element is strapped around the outside of the tank and is covered with heavy insulation, causing heat to pass through the wall of the tank.
In contrast, an immersion water heater has the elements in direct contact with water. Elements pass right through the wall of the tank, with openings around them sealed tightly so the tank maintains its watertight integrity.
How Gas Operated Units Work
Water heaters that use gas as the heating element have as their main parts a gas burner and pilot light. The burner is positioned outside the tank — never in contact with water. Its flame is directed against the bottom of the tank so cold water being discharged from the dip tube is heated.
Water Heaters
Situated in such a position as to be kept hot at all times by the pilot light is a flame sensor. If for some reason the pilot light goes out, the flame sensor cools, and in so doing cuts off the flow of gas to theburner.
Selecting a Water Heater
If you are building a new home, remodeling an older home, or replacing a water heater that has failed, you will want to select a new heater that best meets your family’s needs. The General Public Utilities Corporation has provided a guide that may be used to make a selection:
[br] This article is mostly likely taken out of______.
选项
A、a textbook intended for technicians
B、a consumer guide
C、a book on the history of electric appliances
D、an operation manual for a type of water heater
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3898982.html
相关试题推荐
Waterforyourhomeisheatedbyelectricityorbygas.Ineithercase,thew
Solar-generatedelectricitydocsnotcarrythehealthorenvironmentalrisks
Solar-generatedelectricitydocsnotcarrythehealthorenvironmentalrisks
InOldEnglishthewordgirlcanrefertoayoungpersonofeithersex.Todayit
InOldEnglishthewordgirlcanrefertoayoungpersonofeithersex.Todayit
A______consistsof’avowelsound,eitheronitsownorinthecompanyofone
CampaigningontheIndianfrontierisanexperiencebyitself.Neitherthelan
CampaigningontheIndianfrontierisanexperiencebyitself.Neitherthelan
Untilrecentlydaydreamingwasgenerallyconsideredeitherawasteoftimeor
Icanonlyassumetheyeithercompletelyignorantovertheeconomicsontheissu
随机试题
[originaltext]Washington(dpa)-AfterthefailuresoftheirpasttwoMarsm
A、Thesalarywastoolow.B、Theworkscheduleconflictedwithhisstudy.C、Them
以票据申请质押贷款的,必须对( )进行连续性审查。A.票据 B.出票人
脑动脉粥样硬化时,脑组织可发生A、萎缩 B、软化 C、梗死 D、出血
5岁女婴,家长反映其身高、体重远低于同龄人,为了解其骨龄发展情况,需做的检查是A
2009年浙江普通高中招生人数越是山东的; A、40% B、50%
土地所有权可以用于抵押。( )
(2017年真题)假定某段的现价为32美元,如果某投资者认为这以后的3个月中股票
(2019年、2018年、2016年真题)下列各项中,应计入其他应付款的是
在诊断感染性心内膜炎时,下列哪项概念是错误的A、可以有不发热的病例 B、脑栓塞
最新回复
(
0
)