Good afternoon, ladies and gentlemen. I am honoured to have the chance to attend the International Conference. The topic of my paper is “Numerical Investigation and Thermal Analysis of a Refrigerant-heated Radiator Heating System coupled with Air Source Heat Pump” .The outline of my talk is as follows, the first part I want to introduce the background of this research. the second part is the field test and its data. the third part covers the simulation comparison of different heating devices. Finally, simple conclusions are given.
The motivation for this work is to alleviate the environmental problems caused by fossil energy consumption. As we can see in the picture. When the winter heating period comes, the smog comes along. The entire northern region is shrouded in harmful particulate matter in winter while it will be disappeared in summer. it is related to the massive combustion of fossil fuels in winter in heating period. In order to improve the environment, electric heating equipment were used to replace the coal fired boiler in the heating season. Among the existing electric heating facilities, such as Electric heating film, Storage calorifier. Among the existing electric heating facilities (ASHP) has been widely used in most areas due to its advantages of higher energy efficiency, easy installation and environmental-friendly. The commonly used ASHP systems were the water heating system and air conditioner heating (ACH) system. In water heating system, the system efficiency is lower than the ACH system due to the higher condensation temperature and additional energy consumption of circulating pumps. In the ACH system, the indoor air flow rate is strengthened by the fan settled in the air conditioners, which may cause strong draught sensation and make users feel uncomfortable. So, A novel radiator is urgently needed. The structure of the new refrigerant-heated radiator in the paper is described in Fig1.2. There are two kinds of radiators in the picture. The radiator consists of two steel shells, each consisting of two steel plates. The Refrigerant-heated radiator heating (RRH) system has some obvious characteristics. The experiments are performed at the outdoor air temperature of 0 ± 1 °C. As the condensing temperature increases from 33 °C to 57 °C, the difference between the surface temperature of the radiator and the condensing temperature varies from 0.21 °C to 2.75 °C. In addition, the temperature difference between the refrigerant and radiator is less than 1 °C when the condensing temperature maintains at 41 °C. Uniform surface temperature and constant emissivity Each surface of the room is assumed as diffuse ash surface\Windows and doors are closed\ human activities and heat dissipation of the machine are all out of consideration.
The average temperature for ACH system is about 1 °C higher than that of radiator heating, which is 21.7 °C and 20.7 °C, respectively. A homogeneous temperature distribution is observed in RRH system except some regions close to the radiator and in the two different system, the lowest temperature appears near the door.The surface temperature of the radiator is stable and close to the condensing temperature and temperature difference is close to 1 °C at the condensing temperature of 41 °C.3.A homogeneous temperature variation is obtained for the RRH system while an obvious temperature gradient exists in the ACH system.4.In the range of human activities (0.1 m-2 m), the temperature gradient of the RRH system is about 2 °C, while it is about 6 °C – 8 ℃ in the position of Z=3.4 m in ACH system.
演讲大纲如下，第一部分为研究的背景。第二部分是现场测试及其数据。第三部分为不同加热装置的室内温度场模拟比较。最后总结一些简单的结论。
本文研究的目的在于缓解化石能源消耗引起的环境问题。当冬季采暖期到来时，整个北部地区的冬季就被有害颗粒物笼罩，在夏季消失。这种现象和化石燃料在冬季的燃烧是相关的。为改善环境，在加热季节采用电加热设备代替燃煤锅炉。在现有的电热设备，如：电热膜、蓄热式加热器、空气源热泵在现有电加热设备中，由于具有能量效率高、安装方便、环境友好等优点，在大多数领域得到了广泛的应用。常用的ASHP系统是水暖系统和空调供暖系统。在水加热系统中，由于较高的冷凝温度和循环泵的附加能耗，系统效率低于ACH系统。在ACH系统中，室内空气流速通过空调中安装的风机而加强，这可能引起强烈的通风感，并使用户感到不舒服。因此迫切需要一种新型的辐射器。新型制冷剂加热散热器的结构由两个钢壳组成，每个钢壳由两个钢板组成。制冷剂采暖散热器供暖系统具有明显的特点
一种分布式能源、制冷剂加热系统、没有风扇，会让我们远离室内噪音、自然对流（NT）与辐射换热。在现场实验中，对系统的热性能进行了研究。实验是在室外空气温度0±1°C下进行的。随着冷凝温度从33°C增加到57°C，散热器表面温度与冷凝温度之差从0.21°变化。此外，当冷凝温度保持在41℃时，制冷剂与散热器的温差小于1℃。仿真结果如下：ACH系统的平均温度比散热器高1℃左右，分别为21.7℃和20.7℃。在RRH系统中，除了靠近散热器的一些区域外，观察到均匀的温度分布，而在两个不同的系统中，最低温度出现在门附近。为了便于观察，比较了不同位置的垂直温度变化。在RRH系统中，0.1 m和2 m之间的温差为2.4℃，垂直温度分布是一致的。另一方面，在Ach系统中，0.1 m和2 m之间的温差为4°C。风口温差在6℃～8℃左右。 |