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vars.txt
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num_duct_now = 지금 순서
length_duct_now = 지금 길이
num_duct = 총 갯수
length_duct = 총 길이 모음
length_duct_now = 지금 길이
length_duct_end = 끝 길이
num_duct = 끝 갯수
conduction
k * A * 1/x * (T1-T2)
convection
h_conv * A * (T1 - T2)
ventilation
q_v * p(lau) *C_p * dT
soil density, specific heat, conduction rate
pvc? density, specific heat, conduction rate
ventilation rate
공기
밀도, 비열, 이상적 환기량, 대류열계수
토양
밀도, 비열, 열전도계수
PVC
밀도, 비열, 열전도계수
<< soil >>
***density
light siliceous soil = 1500
density of dry gravel soil = 1600
soil gravel wet = 1800
soil clay dry = 2000
soil clay wet = 2300
mixed soil and pebbles = 1800 - 2200
vegetable soil = 1700
***specific heat
specific heat of dry soil = 800 J/kg degC
specific heat of wet soil = 1480 J/kg degC
***k_cond
thermal conductivity of soil = 0.45 - 1.10 W/m C
overall heat transfer coefficient = 1.00 - 2.45 W/m2 C
density of soil : http://www.themeter.net/pesi-muc_e.htm
specific heat infos : https://www.engineeringtoolbox.com/specific-heat-capacity-d_391.html
thermal conductivity of soil : https://www.researchgate.net/figure/The-influence-of-soil-thermal-conductivity-to-pipeline-operation_tbl1_267599373
<< air >>
density = 1.225 kg/m3
convective heat transfer coefficient of free convection air = 2.5 - 25 W/(m2 K)
of forced air = 10 - 500
specific heat = 1.005 kJ/kg degC
suggested outdoor air ventilation rate (ACPH(ACH) air changes per hour ) =
h_c of air : https://www.sciencedirect.com/topics/engineering/convection-heat-transfer-coefficient
density of air : https://www.macinstruments.com/blog/what-is-the-density-of-air-at-stp/
specific heat of air : https://www.engineeringtoolbox.com/specific-heat-capacity-d_391.html
recommended air changes per hour for home : https://smartairfilters.com/en/blog/ashrae-per-hour-office-residential-school-virus/
<<PVC>>
density 1.38 g/cm3
thermal conductivity = 0.19 W/(m K)
specific heat = 840 - 1170 J/kg degC
density of PVC : https://www.bpf.co.uk/plastipedia/polymers/pvc.aspx
thermal conductivity of PVC : https://www.engineeringtoolbox.com/thermal-conductivity-plastics-d_1786.html
specific heat of PVC : https://www.engineeringtoolbox.com/specific-heat-capacity-d_391.html