Abstract
A possibility of gas engine waste heat conversion into cold for air conditioning in mines using lithium bromide absorption chillers is investigated. Dependencies of parameters of a thermodynamic cycle and energy indicators of chillers on temperatures of a heating medium and a coolant are obtained using mathematical modelling. It is shown that it is rational to use two chillers with sequential movement of a heating medium and a coolant through them in opposite directions for a full conversion of gas engine waste heat. COP of such a system is 0.733. This allows obtaining 2140 kW of cooling capacity with a coolant temperature of 7 °C when using a gas engine JMS-620 by Jenbacher.
Highlights
Non-traditional energy-saving technologies [1 – 15] start to be applied more widely in coal mines of Ukraine at the present time
Excess waste heat of gas engines (GE) can be converted into cold for air conditioning using lithium bromide absorption chillers (LBAC) in deep coal mines that require air conditioning of mine workings
The specific refrigerating capacity q0 produced by LBAC depends on the amount of specific thermal load qh and the chiller coefficient of performance (COP) as shown in the formula (23)
Summary
Non-traditional energy-saving technologies [1 – 15] start to be applied more widely in coal mines of Ukraine at the present time. These technologies include heat pumps based on lowpotential heat and technologies of burning coal mine methane using gas engines (GE). GEs are cogeneration plants (modules) that generate electrical energy and waste heat for heating systems [1]. Excess waste heat of GEs can be converted into cold for air conditioning using lithium bromide absorption chillers (LBAC) in deep coal mines that require air conditioning of mine workings. There are known cases of generation of cold using LBAC in the world practice of air conditioning in mines, including those when waste heat from GEs is converted into cold [16]
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