Table 1 Data used in the present numerical study

Cp _d

Specific heat of adsorbent

920 J kg⁻¹ K⁻¹

Cp _t

Specific heat of tubes (copper) containing the adsorbent

380 J kg⁻¹ K⁻¹

E _g

Emissivity of glass cover

0.88^a

E _P

Emissivity of the top wall of adsorber-collector

0.1^a

n _g

Number of glass cover

1^a

r

Particular gas constant

259.34 J kg⁻¹ K⁻¹

S

Adsorber-collector surface

0.73 m²

t _max

Maximum time of heating process A–C (Fig. 2)

12 h

U _b

Loss coefficient from the bottom of the adsorber-collector

0.9 W K^−1a

W _v

Wind velocity

1 m s⁻¹

α

Thermal expansion coefficient of adsorbate

0.00126 K^−1b

Ω

Adsorber-collector inclination

34 °C^a

σ

Stefan-Boltzmann constant

5.670367E-8 W m⁻² K⁻⁴