Tested device was applied instead of fan heater and oil heater with energy
consumption of 1.5 – 2.5 kW. The initial temperature in the premise was 12ºС.
Vapour-air flow rate was set at 0.25 m/s. Mass of adsorbent ‘silica gel – sodium
sulphate’ was 10 kg. As heat insulator mineral wool (thickness 100 mm, thermal
conductivity coefficient 0.035 W · m/K) was used. Tested device was applied instead
of fan heater and oil heater with energy consumption of 1.5 – 2.5 kW. The initial
temperature in the premise was 12ºС. Vapour-air flow rate was set at 0.25 m/s. Mass
of adsorbent ‘silica gel – sodium sulphate’ was 10 kg. As heat insulator mineral wool
(thickness 100 mm, thermal conductivity coefficient 0.035 W · m/K) was used. Two
modes corresponded to the load-factoring of electric energy in the morning or in the
evening (first or second half-term) were applied. As both modes applied, indoor
temperature is varied within limits from 20 ºС to 22ºС during day or night period. Two
peaks according to discharging and charging of heat energy device are observed on
both curves, they being registered as the first and second after accumulator start.
Higher temperature when charged is resulted from composite adsorbent
regeneration temperature. The adsorbent can be regenerated by the heat provided by
solar collector during day hours or by resistance element in night hours. Efficiency
factors calculated with ratio of two peaks are almost 32 % for both operating modes.
These values are correlated with computed values 33 % for the same conditions.
Advisability of adsorptive heat storage device for heating premises was confirmed
by comparing of energy consumption with solid fuel combustion boiler, gas-fired
combustion boiler and electric boiler, when heat demand equaled to 339.5 MJ per day
for floor area 100 m
2
. When open-type adsorptive heat accumulator used, energy
consumption in heat supply system was decreased in minimum of 3.5 times versus gas-
fired combustion boiler. In comparison with solid fuel combustion boiler and electric
boiler energy consumption can be reduced no less than 2.9 and 2.4 times. When
adsorbent regeneration provided by solar collector, energy consumption was decreased
about 90, 76 and 61 times versus gas-fired combustion boiler, solid fuel combustion
boiler and electric boiler, respectively.
Design of adsorptive heat pump developed for distributed heating systems is
presented on Fig. 7. Operating the adsorptive heat pump proceeds into two steps. The
first stage is associated with adsorption, and the second one being corresponded to
adsorbent regeneration. On the first stage (adsorption) water vapor is supplied from
the evaporator (7) through open distributing checker (10) and then adsorbed by
composite material (adsorbent) (4). At that, heat of adsorption transfers from granule
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