准二级压缩多联机严寒地区供暖性能研究
摘要：为了推动多联机在严寒地区的应用，在哈尔滨搭建了一个准二级压缩多联机实验台，采用根据室外温度分段控制压缩机吸气状态的控制策略，进行了91天的测试。结果表明：采用提出的控制策略，实验机组在整个测试期间均可以稳定运行，最高排气温度为90.6℃,季节性能系数为2.40,且室内温度能够满足供暖需要；导致机组在严寒地区制热量不足的主要因素是误除霜，而不是室外低温，误除霜引起的最大逐时制热量不足率为24.31%,而室外低温环境只有7.74%;在室外温度为-22.5～7.5℃时实验机组的供暖效果较好，室外温度低于-22.5℃时存在制热量不足；因严寒地区的机组选型较大且受压缩机最低频率限制，故在室外温度高于7.5℃时，机组存在频繁启停现象。
关键词：多联机准二级压缩供暖性能低温供暖严寒地区补气误除霜
尊敬的用户，本篇文章需要2元，点击支付交费后阅读
限时优惠福利：领取VIP会员
全年期刊、VIP视频免费!
全年期刊、VIP视频免费!
参考文献[1] 陈超，黄惠，贾永宏.多联机空调系统在西北地区展览型建筑中的应用[J].暖通空调，2022,52(增刊1):112- 114.
[2] 徐欣，雒秦光，杨文杰，等.重庆市某办公建筑节能改造方案与节能量分析[J].暖通空调，2019,49(9):86- 90.
[3] 佟思辰，林坤平，赵墨.海口某金融办公楼空调系统设计与中庭节能分析[J].暖通空调，2021,51(增刊2):74- 78.
[4] 龙惟定.碳中和城市建筑能源系统(1):能源篇[J].暖通空调，2022,52(3):2- 17.
[5] 肖寒松，张国辉，石文星，等.多联机控制技术进展与展望[J].制冷与空调，2019,19(11):69- 79.
[6] 刘晓庆，易博.喷气增焓技术对多联机制冷性能影响分析[J].建筑热能通风空调，2019,38(7):61- 63.
[7] 李建民，孟凡兵.低温空气源热泵在山西某航空文化展示中心应用[J].暖通空调，2021,51(增刊1):244- 246.
[8] CHO I Y,SEO H,KIM D W,et al.Performance comparison between R410A and R32 multi-heat pumps with a sub-cooler vapor injection in the heating and cooling modes[J].Energy,2016,112:179- 187.
[9] KANG D H,JEONG J H,RYU B.Heating performance of a VRF heat pump system incorporating double vapor injection in scroll compressor[J].International journal of refrigeration,2018,96:50- 62.
[10] MIN B C,NA S K,LEE T M,et al.Performance analysis of multi-split variable refrigerant flow (VRF) system with vapor-injection in cold season[J].International journal of refrigeration,2019,99:419- 428.
[11] YANG M H,WANG B L,LI X T,et al.Evaluation of two-phase suction,liquid injection and two-phase injection for decreasing the discharge temperature of the R32 scroll compressor[J].International journal of refrigeration,2015,59:269- 280.
[2] 徐欣，雒秦光，杨文杰，等.重庆市某办公建筑节能改造方案与节能量分析[J].暖通空调，2019,49(9):86- 90.
[3] 佟思辰，林坤平，赵墨.海口某金融办公楼空调系统设计与中庭节能分析[J].暖通空调，2021,51(增刊2):74- 78.
[4] 龙惟定.碳中和城市建筑能源系统(1):能源篇[J].暖通空调，2022,52(3):2- 17.
[5] 肖寒松，张国辉，石文星，等.多联机控制技术进展与展望[J].制冷与空调，2019,19(11):69- 79.
[6] 刘晓庆，易博.喷气增焓技术对多联机制冷性能影响分析[J].建筑热能通风空调，2019,38(7):61- 63.
[7] 李建民，孟凡兵.低温空气源热泵在山西某航空文化展示中心应用[J].暖通空调，2021,51(增刊1):244- 246.
[8] CHO I Y,SEO H,KIM D W,et al.Performance comparison between R410A and R32 multi-heat pumps with a sub-cooler vapor injection in the heating and cooling modes[J].Energy,2016,112:179- 187.
[9] KANG D H,JEONG J H,RYU B.Heating performance of a VRF heat pump system incorporating double vapor injection in scroll compressor[J].International journal of refrigeration,2018,96:50- 62.
[10] MIN B C,NA S K,LEE T M,et al.Performance analysis of multi-split variable refrigerant flow (VRF) system with vapor-injection in cold season[J].International journal of refrigeration,2019,99:419- 428.
[11] YANG M H,WANG B L,LI X T,et al.Evaluation of two-phase suction,liquid injection and two-phase injection for decreasing the discharge temperature of the R32 scroll compressor[J].International journal of refrigeration,2015,59:269- 280.
Heating performance analysis of quasi-two-stage compression variable refrigerant flow system in severe cold zone
Abstract: To promote the application of variable refrigerant flow system(VRF) in the severe cold zone, a quasi-two-stage compression VRF test rig is built in Harbin, a segmented control strategy for the suction refrigerant state of the compressor based on outdoor temperature is adopted, and a 91-day test is conducted. The results show that by adopting the proposed control strategy, the experimental unit can operate stably during the whole test period, the highest discharge temperature is 90.6 ℃, the seasonal coefficient of performance reaches 2.40, and the indoor temperature can meet the heating demand. The main reason leading to the heating capacity shortage of the unit in the severe cold zone is mal-defrost, but not ultra-low outdoor temperature. The maximum hourly heating capacity shortage rate caused by the mal-defrost is 24.31%, while it is 7.74% caused by the ultra-low outdoor temperature. The heating effect of the experimental unit is better at the outdoor temperature of-22.5 to 7.5 ℃, and there is insufficient heating when the outdoor temperature is below-22.5 ℃. Due to the large selection of the unit in the severe cold zone and the limit of the lowest frequency of the compressor, the unit is frequently started and stopped when the outdoor temperature is higher than 7.5 ℃.
Keywords: variable refrigerant flow system; quasi-two-stage compression; heating performance; low-temperature heating; severe cold zone; vapor injection; mal-defrost;
311
0
0