一、前言热电偶作为温度传感器以它价格低廉、结构简单、动态响应快等优点被广泛应用于温度测量上。在暖通空调领域里,许多场合需测量不同温度场间的温差值以求得其间的传热量。如室内、外表面温差、表冷器进、出口水温差等。一般所习惯采用的手段是先分别测出两个不同 I. INTRODUCTION As a temperature sensor, a thermocouple is widely used for temperature measurement because of its advantages of low cost, simple structure, and fast dynamic response. In the field of HVAC, many occasions need to measure the temperature difference between different temperature fields in order to obtain the heat transfer between them. Such as indoor and outdoor surface temperature difference, surface cooler inlet and outlet water temperature difference. The commonly used method is to first measure two different