The Research Of Phase Change Materials Applied In Low Temperature Hot Water Floor Of North Swine Building

In recent years, China’s animal husbandry has been gradually transfered to the East northarea. But in the northern area of China, the winter is long and cold, the cold feed conversionefficiency and swine production performance is lower. So in winter in the north, keeping warmis very important. Pigs one day is about more than70%of the time to lie down to rest, So theimprovement of pig lying area temperature environment is a key problem, But how to furtherimprove the pig belly sense temperature, the decrease of heat and cold stress in pigs is toconsider the design problem.PCM(Phase change materials) have the function of store and release heat, So this designusing PCM in the low temperature hot water floor, and change the structure of the ground,and itis a good method to improve the temperature environment of pig lying area. In this design,Through the literature review, we screening the ratio of80%:20%,70%:30%and60%:40%capric acid and lauric acid as the eutectic Composites, The super lightweight ceramsite as matrixphase change material production type; Then the phase change materials in different proportionswith phase change material thickness were20mm,30mm and40mm, phase change materialtop from the ground surface distance were10mm,20mm and30mm9block transformationconcrete ground, and make the control piece without phase change material surface.Through the10different conditions of ground samples of temperature measurement anddata analysis by the data acquisition:(1) The surface temperature of ground rises with theincrease of water temperature;(2)The PCM energy storage concrete surface heating and coolingare slower than normal concrete ground,but the peak temperature is lower than the normal;(3)After drawing Chart, by comparing the results obtained, the panel4（The ratio of decanoicacid and lauric acid is70%:30%、The thickness is20mm、The distance is20mm）has thehighest temperature, but no ultra25℃, and it can raise the temperature quickly; The lowesttemperature are panel9（The ratio of decanoic acid and lauric acid is80%:20%、The thicknessis40mm、The distance is20mm） and3（The ratio of decanoic acid and lauric acid is60%:40%、The thickness is40mm、The distance is30mm）, and the both have no much changes,Several other pieces of the temperature is basically the same;(4) Through the thermalperformance comparison, The thermal performance of the panel4（The ratio of decanoic acidand lauric acid is70%:30%、The thickness is20mm、The distance is20mm） is better;Through the analysis of orthogonal test table, We can draw the optimum level in the experiment of capric acid and lauric acid ratio is70%:30%, the thickness of the PCM is20mm and the topof the PCM from the ground surface distance is20mm; Provides the basis for making the phasechange materials ground.The use of PCM to raise pigs abdomen feeling temperature, reducedthe temperature fluctuations in piggery and to save building energy consumption provides a newand reliable way.