Comparison of operating costs between lithium bromide refrigeration and electric refrigeration

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Coal prices have been very low over the past two years, and whether it is large chemical plants that use combined heat and power systems or enterprises that employ small industrial coal boilers, lithium bromide refrigeration can help save a significant amount of money. Taking a 1000KW chiller as an example, the comparison is as follows: 1) For electric screw chillers, with an energy efficiency value of 5 and an electricity price of 0.65 yuan, the hourly electricity cost = 1000/5*0.65 = 130 yuan. 2) For lithium bromide chillers (powered by small industrial coal boilers), the heat value of 1 ton of saturated steam at 0.8 Mpa is 660,000 kcal; assuming a thermal efficiency of 75% for the coal boiler, and with coal having a heat value of 5000 kcal per unit, the cost per ton of steam is 66/0.75/0.5*0.45 = 79.2 yuan. Adding the costs associated with water and electricity usage, which amount to 6 yuan per ton, the total cost per ton of steam is approximately 85 yuan. The gas consumption for 1000KW lithium bromide systems is 1.07 tons (including losses due to steam condensation), while the electricity consumption is 5 KW. The total operating cost of lithium bromide systems equals the cost of steam plus the electricity cost: 85*1.07 + 5*0.6 = 95 yuan. By using lithium bromide for electric cooling, the operating costs can be reduced by about 26%.