True Dual Two-Stage Gas Infra-Red Tube Heaters provide precise air to gas ratios at both the high- and low-heat stages for optimum efficiency.
该管式红外线加热器提供低热量的最佳效率高精度空气对气体比。
There is great energy-saving potential in the oil refineries of the P. R. China because of the shortcomings such as high temperatures of discharging gas and low heat efficiency in the heaters.
我国炼油厂加热炉普遍存在排烟温度高和热效率低的缺点，具有较大的节能改造潜力。
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