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Temperature change of heat carriers when passing through a heat exchangerBog'liq 1. Ж.Н.Узоқов MAXSUS SON 2023-1 мақола нашрга чиқди.Temperature change of heat carriers when passing through a heat exchanger
The temperature of the primary heat
carrier is the water of the compressor
cooling system
The temperature of the secondary heat
carrier is the water that uses the heat of the
heated water in the compressor cooling
system
Temperature at the
inlet of the heat
exchanger, ,
С
The temperature at the
outlet of the heat
exchanger,
,
С
Temperature at the
inlet of the heat
exchanger, ,
С
Temperature at the
outlet of the heat
exchanger,
,
С
25,5
20,0
5,0
15,0
The flow rate consumption of the secondary heat carrier was 20 m3/h or 5.5 kg/s. The thermal
power processed in the experimental device can be determined from the heat balance equation as the
heat flux received by the coolant of the secondary heat carrier:
=
∙
∙ (
−
)
(6)
where M
2
is the mass consumption of the secondary heat carrier, kg/s; c
p
is the average specific
isobaric heat capacity of water, equal to 4.19∙10
3
J⁄(kg∙K); T
2
'
, T
2
''
is the temperature of the secondary
heat carrier at the inlet and outlet of the heat exchanger.
Substituting the measured data, we get the value of the processed heat power equal to 230 kW.
The recycling coefficient can be calculated according to the following formula:
=
∙
э
∙
э
∙
, (7)
where q
T
is the relative consumption of standard fuel for generating heat in mine boilers, kg/kJ;
η
e
– FIK of the power transmission line between the power station and the mine; q
e
– comparative
consumption of standard fuel for electricity production, kg/kJ; N_k is the power of the compressor
engine, kW.
If the specific fuel consumption for heat production in mine boilers for mining conditions is
4.04∙10
(-5)
kg/kJ and the specific fuel consumption for electricity production is 9.43∙10
(-5)
kg/kJ, FIK
Assuming that ƞ
e
=0.9, the power value of the processing energy calculated above and equal to 230
kW, the actual power consumed by the engine of the 4BM10-100/8 compressor from the network for
its normal operation is 600 kW, were taking the value of the energy coefficient of operation equal to
0.15, that is, in this case, taking into account the recycling of the heat released from the heated water
in the cooling system, the total FIK of the compressor unit increases by 15%.
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