[单项选择]{{B}}第二篇{{/B}}

The use of heat pumps has been held back largely by skepticism about advertisers’ claims that heat pumps can provide as many as two units of thermal energy for each unit of electrical energy used, thus apparently contradicting the principle of energy conservation. Heat pumps circulate a fluid refrigerant(致冷剂) that cycles alternatively from its liquid phase to its vapor phase in a closed loop. The refrigerant, starting as a low-temperature, lowpressure vapor, enters a compressor ’driven by an electric motor. The refrigerant leaves the compressor as a hot, dense vapor and flows through a heat exchanger called the condenser, which transfers heat from the refrigerant to a body of air. Now the refrigerant, as a high-pressure, cooled liquid confronts a flow restriction which causes the pressure to drop. As the pres sure falls, the A. explain the differences in the working of a heat pump when the out-door temperature changes B. contrast the heating and the cooling modes of heat pumps C. describe heat pumps, their use, and {actors affecting their use D. advocate the more widespread use of heat pumps 查看答案 更多"{{B}}第二篇{{/B}} The use "的相关试题: [单项选择]{{B}}第二篇{{/B}} The use of heat pumps has been held back largely by skepticism about advertisers’ claims that heat pumps can provide as many as two units of thermal energy for each unit of electrical energy used, thus apparently contradicting the principle of energy conservation. Heat pumps circulate a fluid refrigerant(致冷剂) that cycles alternatively from its liquid phase to its vapor phase in a closed loop. The refrigerant, starting as a low-temperature, lowpressure vapor, enters a compressor ’driven by an electric motor. The refrigerant leaves the compressor as a hot, dense vapor and flows through a heat exchanger called the condenser, which transfers heat from the refrigerant to a body of air. Now the refrigerant, as a high-pressure, cooled liquid confronts a flow restriction which causes the pressure to drop. As the pres sure falls, the A. carefully qualifying the meaning o{ that principle B. pointing out a factual error in the statement that gives rise to this question C. supplying additional relevant facts D. denying the relevance of that principle to heat pumps. 查看答案 [单项选择] The use of heat pumps has been held back largely by skepticism about advertisers’ claims that heat pumps can provide as many as units of thermal energy for each unit of electrical energy used, thus apparently contradicting the principle of energy conservation. Heat pumps circulate a fluid refrigerant that cycles alternatively from its liquid phase to its vapor phase in a closed loop. The refrigerant, starting as a low-temperature, low-pressure vapor, enters compressor driven by an electric motor. The refrigerant leaves the compressor as a hot, dense vapor and flows through a heat exchanger called the condenser, which transfers heat from the refrigerant to a body of air. Now the refrigerant, as a high-pressure, cooled liquid, confronts a flow restriction which causes the pressure to drop. As the pressure falls, the refrigerant expands and partially vaporizes, becoming chilled. It then passes through a second heat exchanger, the evaporator, which transfers heat from the air to the A. explain the differences in the working of a heat pump when the outdoor temperature changes B. contrast the heating and the cooling modes of heat pumps C. describe heat pumps, their use, and factors affecting their use D. advocate the more widespread use of heat pumps 查看答案 [单项选择] The use of heat pumps has’ been held back largely by skepticism about advertisers’ claims that heat pumps can provide as many as units of thermal energy for each unit of electrical energy used, thus apparently contradicting the principle of energy conservation. Heat pumps circulate a fluid refrigerant that cycles alternatively from its liquid phase to its vapor phase in a closed loop. The refrigerant, starting as a low-temperature, low-pressure vapor, enters compressor driven by an electric motor. The refrigerant leaves the compressor as a hot, dense vapor and flows through a heat exchanger called the condenser, which transfers heat from the refrigerant to a body or air. Now the refrigerant, as a high-pressure, cooled liquid, confronts a flow restriction which causes the pressure to drop. As the pressure falls, the refrigerant expands and partially vaporizes, becoming chilled. It then passes through a second heat exchanger, the evaporator, which transfers heat from th A. explain the differences in the working of a heat pump when the outdoor temperature changes B. contrast the heating and the cooling modes of heat pumps C. describe heat pumps, their use, and factors affecting their use D. advocate the more widespread use of heat pumps 查看答案 我来回答: 提交 最新试题 ●    [判断题]高瓦斯矿井采煤工作面甲烷超限断电范围是:工作面及其回风巷内全部非本质安全型电气设备。() ●    [判断题]高速铁路通信相关岗位从业人员的工作经历要求：从事铁路干线通信设备维护工作不少于2年。 ●    [单选题]闭锁料斗慢速装料的主要现象为( )。 ●    当未来市场利率趋于下降时，应选择发行（）。 ●    [单选题]车站办理（ ）接车或通过时，可不出场接送列车。 ●    [不定项选择题]直接影响信息流广告点击量的因素包括 网站地图 我要搜题网  版权所有  ©2023  湘ICP备18016427号   购买搜题卡查看答案 [会员特权] 开通VIP， 查看 全部题目答案 [会员特权] 享免全部广告特权 推荐91天 ¥36.8 ￥80元 31天 ¥20.8 ￥40元 365天 ¥88.8 ￥188元 请选择支付方式 微信支付 支付宝支付 点击支付即表示同意并接受了《购买须知》 立即支付 系统将自动为您注册账号 已有账号登录 找回账号密码 请使用微信扫码支付 订单号： 请不要关闭本页面，支付完成后请点击【支付完成】按钮 支付完成 取消支付 恭喜您，购买搜题卡成功 系统为您生成的账号密码如下： 账号 密码 重要提示：请拍照或截图保存账号密码！ 我要搜题网官网：https://www.woyaosouti.com 我已记住账号密码