能源质量与能源供应温度有关。为了评估奥斯陆郊外Fornebu规划的100 GWh区域供暖系统，引入了TEA曲线，而不是火用项。在分析能源系统时提出的问题是:——我们如何设计出一种能提高低温能源利用率的设计？——低流速设计，即低管道成本，是否与低温能源的使用兼容？——我们能通过分布的温度和相应的能量量来可视化所使用的能量的质量吗？TEA曲线的能量供应温度为x- 轴和y轴上的能量供应量。举例说明:TEA曲线的计算如下，并将其加起来超过一年:当供水/回水温度为75°C/40°C时，在40°C以下、52°C以下34%和75°C以下100%的温度下供应0%的电力。在此基础上，可以绘制一条涵盖一年内不同供水/回水温度的年持续时间曲线，即TEA曲线。实现了TEA曲线的电子表格分析工具，并用于Fornebu的供热厂设计和优化。本文介绍了TEA曲线，并说明了如何进行评估。 讨论中包括60°C/50°C到110°C/40°C的不同设计温度。主要发现是:——TEA曲线清楚地表明了能源质量的使用——避免分流-尽可能利用可用的高温——与60°C/50°C设计相比，75°C/40°C设计提高了能耗水平。单位:I-PCITION:研讨会，ASHRAE交易，第105卷，pt。1999年2月2日，西雅图

Energy quality relates to energy supply temperatures. Instead of the exergy term, a TEA curve was introduced for evaluating the planned 100 GWh district heating system of Fornebu, outside Oslo.The questions that were raised when analyzing the energy system were:-- how could we make a design that improves the use of low temperature energy?-- is a design with low flow rate, i.e. low pipeline costs, compatible with the use of low temperature energy?-- can we visualize the quality of the energy used through the distributed temperatures and the corresponding quantity of energy?The TEA curve has the energy supply temperature on the x-axis and the energy supply quantity on the y-axis. Exemplified the TEA curve is calculated as follows, and adds it up over one year: When the water supply/return temperature is 75°C/40°C then 0% of the power is supplied at temperatures below 40°C, 34% below 52°C, and 100% below 75°C. On this basis an annual duration curve, TEA curve, covering the different supply/return water temperatures over a year, can be made.A spreadsheet analysis tool for the TEA curve was implemented, and used for the heating plant design and optimiza-tion at Fornebu.The paper presents the TEA curve and shows how evaluations may be done. Different design temperatures ranging from 60°C/50°C to 110°C/40°C are included in the discussion.The main findings are:-- The TEA curve demonstrates clearly the use of energy quality-- Avoid shunting; -utilize the available high temperatures when possible--A 75°C/40°C design improves the level of energy use compared to a 60°C/50°C design.Units: I-P