Article ID:1674 - 2974(2009) 05 - 0083 - 05 Development of Temperature - Humidity Independent Control Air - Conditioning Unit for Residential Buildings HAN Xing1, ZHANG Xu1, LIU Jin - tao2, GAO S- i yun2, KANG Yue2 ( 1. Institute of HVAC 2. Hisense R residential buildings; cold dehumidification; exper- i mental study CLC number: TB61Document code: A In the ventilation standards, the indoor relative humidity was always ignored in the past, because if the relative humidity is maintained between 30% and 70% ,it affects little on peoples thermal com - fort. [ 1- 3] In Yangtze River area, the outdoor air hu - midity is very high in the whole year, so the building moisture load needs to be taken into consideration when designing theair - conditioning system. [4- 5] Jiang Yi etc. started to study the temperature and humidity control air - conditioning system in 1990s. They[6]pointed out that low temperature cold source (e. g. 7water) must be provided to remove both sensible latent loads, which is a waste of energy, be - y ture cold source. They developed the liquid desiccant dehumidification system to control the humidity and medium temperature cold water refrigerator to control the temperature. However, the liquid desiccant dehumidification systems are often too large and expensive for a res- i dential house. Thus, to develop a new kind of air - conditioner for the residential building to control the temperature and humidity independently is the very problem that we are facing with and to solve. Radiation panel is a new kind of air conditioning device removing heat through radiation[ 7]. The water supply temperature cannot exceed the indoor dew f R3 FSy RFf5ySTNSj ByN X(),,Df Tj Uy ,
[email protected] 第 36 卷第 5 期 2 0 0 9 年 5 月 湖南大學學報 ( 自 然 科 學 版 ) Journal of Hunan University(Natural Sciences) Vol. 36, No. 5 May2 0 0 9 cause sensible load can be removed b higher tempera -point temperature in case o condensation on its sur - eceived date: 2009- 0 - 09 oundation item:upported besearchund o the 11thearciechationalupport Pro ect iograph :HAing 1981-male Phoong iniversit Corresponding author E - mail: hang u - hvacmail. tong i. edu. cn face. However, the water supply temperature is a- l ways around 7 Celsius degree, which is much lower than the indoor dew point temperature. Consequent- ly, heat exchangers or mixture valves are needed to get medium temperature cold water (around 18 Ce- l sius degrees), which is obviously a waste of energy according to the second law of thermodynamics. Thus, producing medium temperature cold water ( 16 ~ 18) directly is a solution to t he problem. At the same time, dry air is needed to compen - sate the indoor latent load; otherwise, condensation may happen on the surface of the radiation panel. In this paper, we developed a high efficiency residential air - conditioning unit, which can produce medium temperature cold water and dry air simulta - neously to deal with the sensible load and latent load separately. 1Study on the Supply Air In t
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