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Foreword With the development of social economy and growth in the living
standard， Heating Ventilation and Air Conditioning（HVAC） energy
consumption has held a larger and larger proportion in national
energy consumption， and thus more attentions are drawn to HVAC
energy conservation of countries in the world． In the 1960s~1970s， the activity of tunnel digging was conducted to
be prepared against war and natural disaster nationwide. The soil
heat transfer obtains the delay features， therefore， the air inside
the tunnel is warm in winter and cool in summer， and generates huge
energy． Applying air source （also known as air energy） heat pump principle
in combination with air characteristics in tunnels， author of the
original work and his research team took the responsibility to
conduct the research project of Air Source Heat Pump Based on Air
through Tunnel of Ministry of Housing and UrbanRural Development，
which implemented deep research and exploration to the
characteristic of air through tunnel in winter and summer as well
as the air source heat pump based on air through tunnel， which put
forward the energy conservation technology of air source heat pump
and air through tunnel coupling， and made approvable contribution
to the promotion of green energysaving building industrial
development. This book， translated and published the research
achievement of the author of original work， The translation work of this book is supported and instructed by
Professor Li Yongan， author of the original work， and assisted by
some colleagues， whereby the translator expresses grateful thanks
to them all． If some mistakes or improper parts are found due to the limited
knowledge level of the translator， you are very welcome to share
criticism and correction． Xing Dean May， 2015 Introduction 1.1Current situation of energy source in China(1) 1.2Utilization of renewable energy resource(4) 1.3Traditional utility pattern of air through tunnel （hereafter
referred to as “ATT”）(6)Chapter 2Characteristic of Formation Temperature
Change 2.1Source of formation energy(9) 2.11Solar radiation energy(9) 2.12Biological heat(10) 2.13Geothermal resources(10) 2.2Thermophysical property of formation soil(10) 2.21Heat conductivity coefficient λ(10) 2.22Specific heat cp(11) 2.23Thermal diffusivity α(11) 2.3Change rules of soil temperature inside formation(13) 2.4Numerical mathematical model for original soil temperature
field(13) 2.41Dynamic model of shallow underground soil temperature
distribution (14) 2.42Solve the shallow formation soil temperature distribution in
application of Fourier Law(16) 2.5Characteristic analysis of formation temperature wave(18) 2.51Formation soil temperature attenuating property(18) 2.52Temperature wave delay(20) 2.53Calculation of original formation soil temperature at the same
time (21)Chapter 3Heat Transfer between Soil and Air in Tunnel 3.1Analysis of tunnel wall heat conduction process(23) 3.2Introduction of coupling problem(25) 3.3Selection of turbulence model(29) 3.4Processing of nearwall region(30) 3.5Mathematical deion of the model(31) 3.6Mesh generation of mathematical model(32) 3.7Definition of boundary conditions in GAMBIT and FLUENT(33) 3.71Settings for boundary conditions(33) 3.7.2Preliminary defining of the types of boundary conditions in
the GAMBIT(36) 3.73Further defining the conditions of the mathematical model in FLUENT(36)Chapter 4Process Analysis of Air through Tunnel in Summer 4.1Determination of different parameters in simulation
computation(40) 4.11Air outdoor meteorological parameters(40) 4.12Formation temperature(41) 4.13Tunnel masonry material(43) 4.14Convection heat transfer coefficient(43) 4.2Analog computation and analysis of all factors for air cooling
through tunnel(44) 4.21Simulation computation and analysis for air cooling factors through tunnel under(44) 4.22Dynamic simulation computation and analysis of air temperature drop through tunnel(52) 4.3Tunnel cooling efficiency(66) 4.31Effect of tunnel length on tunnel cooling efficiency(67) 4.32Effect of tunnel buried depth on tunnel cooling efficiency(68) 4.33Effect of tunnel wind speed on tunnel cooling efficiency(70) 4.34Effect of tunnel structure size on tunnel cooling
efficiency(71) 4.35Effect of different ventilation time on tunnel cooling
efficiency (72)Chapter 5State Change of Air through Tunnel in Winter 5.1Introduction of mathematical model(75) 5.11Model zone setting(76) 5.12Air outdoor meteorological parameters(76) 5.13Formation temperature(78) 5.1.4Soil physical property parameters (79) 5.15Determination of convection heat transfer coefficient(80) 5.2Simulation results(81) 5.3Analog computation and analysis of all factors for air heating
through tunnel(84) 5.31Simulation computation and analysis for air heating factors through tunnel under steady state(84) 5.32Dynamic simulation computation and analysis of air temperature drop through tunnel(94) 5.4Tunnel heating efficiency(105) 5.41Effect of tunnel length on tunnel heating efficiency(106) 5.42Effect of tunnel buried depth on tunnel heating
efficiency(108) 5.43Effect of tunnel wind speed on tunnel heating efficiency(109) 5.44Effect of tunnel structure size on heating
efficiency(110)Chapter 6Air through Tunnel Experimental Study 6.1Experimental object deion(112) 6.2Experimental methods and apparatus(114) 6.21Conditions preparation before the experiment(114) 6.22Experimental methods and procedures(114) 6.23Experimental apparatus(116) 6.3Experimental error analysis(118) 6.3.1Experimental apparatus error analysis(119) 6.3.2Error analysis of experimental measurement(119) 64Experimental procedures and data processing(121) 6.41The experimental procedures and results of tunnel parameters measurement under original state(121) 6.42Experimental procedures and results of each measured
parameters inside the tunnel under ventilation state(125) 6.5Comparative analysis of experimental results and theoretical
calculation (131)Chapter 7ASHP 7.1Heat pump and its type(136) 7.2Air source heat pump （ASHP）(137) 7.3The characteristics of ASHP(140) 7.4The Applicability of ASHP(143)Chapter 8Air Source Heat Pump
Based on Air through Tunnel 8.1Air source heat pump based on air through tunnel(150) 8.2Introduction of ASHP experimental system based on air through
tunnel (152) 8.21Work principle of ASHP system based on ATT(152) 8.22Experiment facility and test method(153) 8.3Experiment data and analysis of ASHP based on ATT(157) 8.4Frostless ASHP based on ATT(162) 8.5Application analysis of ASHP based on ATT(164) 8.6Innovation Analysis of ASHP based on ATT(168)Annex Annex 1Surface Temperature， Temperature Wave Amplitude， and Maximum Depth of Frozen Ground of Main Cities in China(173) Annex 2Calculating Parameter for Building Material Thermo
Physical Characteristic(181)2,3,7,8 |
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武邑县|
阿拉善左旗|
吐鲁番市|
柘荣县|
赣州市|
手游|
普陀区|
琼海市|
长春市|
丹寨县|