[工學(xué)]建筑環(huán)境學(xué)chapter41-2thermalcomfortable(1)-資料下載頁
2025-03-22 02:33本頁面
【正文】 e to global warming of the World’s weather systems. CFCs ) 氟氯碳化物類 CFC replacements 氟利昂替代物 ? Ammonia 氨 is an efficient refrigerant but its toxicity and flammability requires special safety measures. ? Carbon dioxide 二氧化碳 is used in some large refrigeration plants and requires high operating pressures. ? Compression refrigeration cycle 壓縮式制冷循環(huán) ? Absorption refrigeration cycle 吸收式制冷循環(huán) refrigerators 制冷機(jī) A heat pump is a device which extracts heat from a low temperature source and upgrades it to a higher temperature. For a heat pump, The condenser coils are used to heat air or other medium Heat pumps 熱泵 ? The coefficient of performance (COPH) of a heat pump 熱泵的性能系數(shù) is the ratio of heat output to the energy needed to operate the pump 211H i n pu te n e r g y P u m pou t pu t e n e r g y H e a t C O PTTT???Heat pump efficiency ? 一熱泵功率為 10kW，從溫度為 13℃ 的周圍環(huán)境向用戶供熱，用戶要求供熱溫度為 95 ℃ 。如果熱泵按逆卡諾循環(huán)工作，求供熱量。 解：設(shè)熱泵按逆卡諾循環(huán)運(yùn)行，根據(jù)題意， t1= 95 ℃ ， t2= 13℃ n pu te n e r g y P u m p ou t pu t e n e r g y H ea t C O P211H ???? TTT pump energy input :10kW heat energy output: 熱泵從環(huán)境中取得的熱量 供熱量中 注冊設(shè)備師考試題 ? 冬季 利用熱泵為房屋供暖，使室內(nèi)溫度保持在 20℃ ，需要向室內(nèi)供熱 3000W，室外環(huán)境溫度為 5℃ ，試求該熱泵的熱泵性能系數(shù)（供熱系數(shù)）？ ? 帶動該熱泵工作所需要的最小功耗是多少？ ? ? Heat sources for heat pumps ? Air ? Earth ? Water ? Exhaust heat A geothermal heat pump system. Summary of chapter 2 Nature of heat, its measurement and its effect 熱的性質(zhì)、量度和作用 Heat transfer 熱傳遞 Gases and vapours, and their effects 氣體和蒸氣，及其作用 Refrigerators and heat pumps 制冷機(jī)及熱泵 useful sentence patterns： XX is the standard SI unit of YY ?焦耳是國際單位制中能量的單位 ?開爾文是國際單位制中溫度的單位 Table XX gives YY values for a variety of materials ?表（ ）給出了不同材料的（ 比容 ） 值 xx will be discussed in later chapter. ? 這些問題在以后的章節(jié)中會講到。 ? 物質(zhì) /體： matter material substance They have the basic characteristics given below. ? 它們具有以下特性 XX is given by the following formula. ? (潛熱 ）可用下式計算 ? (顯熱）可用下式計算 XX is about YY times that of ZZ ?鋁 的膨脹系數(shù)是 鋼 的 2倍 ?塑料 的膨脹系數(shù)是 鋼 的 10倍 ?酒精 的膨脹系數(shù)是 水 的 5倍 ? Expand on heating and contract on cooling ?受熱膨脹冷卻收縮 For each degree of temperature rise ?溫度每降低 1℃ xx is inversely proportional to yy ? 體積 與 壓力 成反比 xx is directly proportional to yy ? 體積 與 熱力學(xué)溫度 成正比 ? 壓力 與 熱力學(xué)溫度 成正比 Temperature must always be in xx ?溫度應(yīng)采用開氏溫度 ?溫度可采用攝氏溫度 The sum of xx ?各分壓力之和 Have already been described ?已經(jīng)講過的 xx is ( are ) shown schematically in figure yy ? 壓縮循環(huán)的工作原理如圖 xx is the ratio of yy to zz ? 熱泵的性能系數(shù)是（ 輸出的熱量 ）與（ 熱泵運(yùn)轉(zhuǎn)所需能量 ）的比值 ? is of two types: 對流有兩種類型 Exercises in class 1) The following statements are related to the “Greenhouse effect”, which one is correct ( ) A short wavelength can pass through the atmosphere B short wavelength can pass through the glass C longer wavelength can pass through the atmosphere D longer wavelength can pass through the glass 2) Among the following statements , which one is correct? ( ) A A refrigeration cycle can make cooling effect only B A refrigeration cycle can make heating effect only C A refrigeration cycle can make the cooling effect and heat effect at the same time D The principle of refrigerator is the same as that of heat pump 3) In pression refrigeration cycle, which ponent can make cooling effect （ ） A pressor B evaporator C expansion valve D condenser 4) In pression refrigeration cycle, which ponent can make heating effect （ ） A pressor B evaporator C expansion valve D condenser 5) the extraction coil (evaporator) of heat pump can absorb heat from（ ） A air B earth C water D exhaust heat 6) A refrigerant must be below its( ), or it will not( ) , and it must be above its( ) , or else it will( ) . A critical temperature B melting point C solidify D liquefy Other exercises ? 有一臺放置在室外的冷庫，從減小冷庫冷量損失的角度，冷損失最小的冷庫外殼顏色為（ ） A 綠色 B 藍(lán)色 C 灰色 D 白色 ? 大氣層能阻止地面上絕大部分的熱輻射透過，這稱之為大氣層的（ ） A 選擇性 B 溫室效應(yīng) C 吸收性 D 反射性 ? 兩表面發(fā)射率均為 的無限大平行平板，若在其間加入兩個表面發(fā)射率也是 的遮陽板，則換熱量減少為原來的（ ） A 1/5 B 1/4 C 1/3 D 1/2
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