Study On The Value Methods Of The Outdoor Calculated Temperature For Intermittent Heating

The heating outdoor calculated temperature is the crucial parameter of the building thermal load calculation and equipment selection. In the current HVAC design specification, the determination method of heating outdoor calculated temperature is "on average over the years doesn’t guarantee daily average temperature of five days",mainly for the heat load calculation of continuous heating. But most buildings like office buildings, residences, schools and other buildings are not continuously use for all year and all day. For these intermittent heating buildings that has clear rules of using time, during the heat load calculation, if still using the continuous heating outdoor calculated temperature of the specification, it is appear houses’ overheating,energy consumption’s wasting and other problems. However, there is lack of outdoor calculated temperature and statistical methods. Therefore, for the intermittent heating buildings those have clear intermittent discipline, it should find reasonable methods for outdoor calculated temperature of intermittent heating. In this paper, the main research contents and results are as follows:(1) According to the characteristics of the intermittent time and the characteristics of intermittent heating, intermittent heating buildings has been classified, and the using rules of all kinds of intermittent heating building have been put forward.(2) In accordance with the existing value method of the outdoor calculated temperature for continuous heating, analyzed the deference between outdoor meteorological data of intermittent heating and continuous heating, several statistical methods of outdoor calculated temperature for intermittent heating have been put forward, and the reasonable analysis for statistical methods has been given.(3) For different intermittent buildings, the value methods of outdoor calculated temperature for short-term intermittent heating have been proposed(three kinds), the value method of outdoor calculated temperature for long-term intermittent heating has been proposed(one kind), the value methods of outdoor calculated temperature for long and short term integrated intermittent heating have been proposed(three kinds), and each methods were illustrated.(4) In accordance with the different intermittent heating buildings, using proposed method to statistically calculate, the heating outdoor calculated temperature values of major urban have been gained. Most of the city can be increased 3.0 ~ 6.0 ℃.(5) The change value of outdoor calculated temperature for intermittent heating on the influence of thermal load calculation has been analyzed, the change rates of the heat load for different intermittent heating buildings in major cities have been given,the maximum decreased of 22.0%.(6) The characteristics of the value method of outdoor calculated temperature for intermittent heating were analyzed, and applicable conditions have been proposed.