Too much insulation, on the other hand,, would be costly, and not provide much more effective ness. This is a classic type of optimisation problem, balancing capital and operating costs.

• 另一方面，过度绝热，花费很大而且并不能大大提高效率。这就是在投资与操作费用之间求平衡的一个典型的优化问题。