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Effektivnoct' dvukhstupenchatogo teploutilizatora na teplobykh trubakh

100%

Kulikova N., Red'ko A.

Motrol. Motoryzacja i Energetyka Rolnictwa

2013

tom 15

nr 6

Method to estimate water permeability functions of moderately wet soils with help of heat pipe technique

88%

Globus A. M., Gee G. W., Fayer M., White M.

Zeszyty Problemowe Postępów Nauk Rolniczych

1996

tom 436

Water permeability of moderately wet soils, i.e., their unsaturated hydraulic conductivity and water diffusivity are seldom measured directly, yet are often needed by numerical models to simulate transport processes. These functions can be evaluated from steady state water content and temperature profiles in heat pipes - closed columns of uniformly moistened soil subjected to temperature gradient. For such systems Sw = DT/D(θ) = -dθ/dT where Sw is the thermogradient coefficient, DT is the thermal water diffusivity, D(θ) is isothermal water diffusivity and dθ/dT is the rate of change of water content with temperature deduced from steady state profiles of θ(x) and T(x), x - is the distance from one of column ends. DT varies in a relatively narrow range and can be assumed as a constant.Then D(θ) can be estimated as DTSw where Sw is measured in various locations along soil columns. Using water retention data, the steady water content profile can be procedure for estimating D(θ) can then be applied to estimate hydraulic conductivity, K(θ). Soil columns ranging in length from 5 to 10 cm, exposed to thermal gradients of l°C/cm for periods as short as 7 d, at initial suction values ranging from 1 to 1.5 MPa, can be used to estimate D and K with uncertainties of factor of five or less in the suction range from 0.03 to 3 Mpa.

Ocenka ehffektivnosti solnechnykh teplovykh kollektorov na osnove aljuminievykh teplovykh trub pri renovacii starykh zdanijj

75%

Khairnasov S., Voloshchuk V., Zakovorotnijj A., Kozak D.

Motrol. Motoryzacja i Energetyka Rolnictwa

2014

tom 16

nr 4

Ograniczanie wyników

2 Motrol. Motoryzacja i Energetyka Rolnictwa

1 Zeszyty Problemowe Postępów Nauk Rolniczych

1 Fayer M.

1 Gee G. W.

1 Globus A. M.

1 Khairnasov S.

1 Kozak D.

1 Kulikova N.

1 Red'ko A.

1 Voloshchuk V.

1 White M.

1 Zakovorotnijj A.

1 2014

1 2013

1 1996

Wyniki wyszukiwania

Effektivnoct' dvukhstupenchatogo teploutilizatora na teplobykh trubakh

Method to estimate water permeability functions of moderately wet soils with help of heat pipe technique

Ocenka ehffektivnosti solnechnykh teplovykh kollektorov na osnove aljuminievykh teplovykh trub pri renovacii starykh zdanijj