CAJ | 학술논문

为将毛细管换热器应用于日光温室中，该文试验测试了毛细管换热器的热工性能和流动阻力，得到毛细管换热器在0.0306、0.0222和0.0139 kg/s流量下散热量与过余温度（20～50℃范围内）的关系曲线以及相应阻力和流量的变化关系曲线。在低于40℃的低温热水供暖状态时，在25～30℃的过余温度下毛细管换热器垂直放置时可提供258～323 W/m2的散热量，而水平放置时散热量达到307～381 W/m2。在此基础上，设计了一套采用生物质固体成型燃料供热的基于毛细管换热器的日光温室低温供暖系统，试验温室和对照温室建筑面积均为518.5 m2。测试结果表明，采用合理的供暖方案，在每天燃烧秸秆固体成型燃料125 kg能保证试验温室夜间平均冠层气温10℃以上，-15 cm土壤温度15℃以上，与对照温室相比，夜间平均气温、最低气温和-15 cm土壤温度分别提高了9.0、6.5和5.7℃。
위장모세관환열기응용우일광온실중，해문시험측시료모세관환열기적열공성능화류동조력，득도모세관환열기재0.0306、0.0222화0.0139 kg/s류량하산열량여과여온도（20～50℃범위내）적관계곡선이급상응조력화류량적변화관계곡선。재저우40℃적저온열수공난상태시，재25～30℃적과여온도하모세관환열기수직방치시가제공258～323 W/m2적산열량，이수평방치시산열량체도307～381 W/m2。재차기출상，설계료일투채용생물질고체성형연료공열적기우모세관환열기적일광온실저온공난계통，시험온실화대조온실건축면적균위518.5 m2。측시결과표명，채용합리적공난방안，재매천연소갈간고체성형연료125 kg능보증시험온실야간평균관층기온10℃이상，-15 cm토양온도15℃이상，여대조온실상비，야간평균기온、최저기온화-15 cm토양온도분별제고료9.0、6.5화5.7℃。
Solanaceous fruit vegetables are able to be planted in a solar greenhouse without a heating system during winter in northern China. But low temperatures under 8℃often happen at night in a solar greenhouse. So a heating system in a solar greenhouse is a crucial technology for agricultural fresh produce such as vegetables in winter in order to improve the inner environment. A new heating technique using a capillary tubemat exchanger was introduced to a solar greenhouse. Thermal characteristics and property of flow resistance were tested under 0.0306 kg/s, 0.0222 kg/s and 0.0139kg/s water flow rates and 20~50℃ excess temperature in a laboratory. The diameter and wall thickness of the capillary tube was 4 mm and 1 mm. The length, width, and distance between neighboring capillary tubes were 2800 mm, 600 mm, and 20 mm. Function curves of heat flux and local resistance under different water flux were obtained. The influence of water flux could be ignored, but set position had a great influence on the results. The heat fluxes were 258~323 W/m2 and 307~381 W/m2 when sample capillary tubemat exchangers were set with vertical position and horizontal position under an excess temperature of 25~30℃. Inorder to test the feasibility of the capillary tubemat exchangers in a solar greenhouse, a low water temperature heating system using capillary tubemat exchangers was designed for a solar greenhouse with a 518.5m2 covered area seated in Beijing Changping district. 120 m2 capillary tubemat exchangers were installed along the back wall and side wail in the solar greenhouse. A biomass boiler supplied th℃e 6h0eat water. Low 40℃ water was supplied to the capillary tubemat exchangers using a water mixing valve. Contrast tests were conducted between two same structure solar greenhouses in winter during the year 2012 through 2013, during which one solar greenhouse with a heating system and the other without were monitored. Soil temperature at the 15cm depth and canopy temperature were measured every 10 minutes during the experiment in the two greenhouses. Average night canopy temperature and soil temperature at 15cm depth under ridge cultivation could be kept at 10℃and 15℃above while using 125 kg of straw biomass fuels every night. The average night canopy temperature, lowest temperature, and soil temperature at 15 cm depth under ridge cultivation during the experiment were 9.0℃, 6.5℃, and 5.7℃higher than compared to a solar greenhouse.