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Title: Simulation tests on dehumidifiers for optimal energy usage
Authors: Lee, Germaine Cai Hui.
Keywords: DRNTU::Engineering
Issue Date: 2013
Abstract: It is becoming of great significance to substantially model building energy usage and function of humidity control systems in order to achieve higher energy savings level in view of increasing environmental issues and need for energy efficiency. With the development of EnergyPlus program, it has become possible for design engineers to analyse the energy usage of dehumidifiers and find a room size that best fits the dehumidifier with respect to cost savings and water removal. Previous research studies have shown that Direct Expansion dehumidifiers are energy efficient and help reduce the cost of maintenance of home durability and acceptable air quality. A generic performance curve was also developed from the data of six residential dehumidifiers to enable ease of simulation of energy usage for dehumidifiers at a rated operating condition. Therefore, this project will be a series of simulation on four of the Direct Expansion dehumidifiers to find a room size which best fits the dehumidifiers at the relative humidity set-point, that yields highest water removal which are not provided by the manufacturers under Singapore weather conditions. The test results show that all four dehumidifiers have a larger optimal room size when the relative humidity set-point is 70% compared to when it is at 50% and 60%. For 50% and 60% relative humidity set-points, the optimal room sizes are similar around 40 m2 to 47 m2. For 70% relative humidity set-point, the optimal room sizes for the four dehumidifiers are all above 70 m2 but Ultra-Aire XT150H has the highest at 97 m2. All four dehumidifiers are adequate for dehumidifying a living room size around 34 m2 in Singapore housing to a healthy level of 70% and below relative humidity as it has not exceed the optimal room size.
Rights: Nanyang Technological University
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:MSE Student Reports (FYP/IA/PA/PI)

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Numerous dehumidifiers are available in the market at present, however not all are energy efficient and contribute to excessive energy consumption. National Renewable Energy Laboratory’s (NREL) carried out an experiment on six residential dehumidifiers of different capacities in the Heating, Ventilating, and Air-Conditioning (HVAC) Systems Laboratory at a standard rated operating condition of 80ºF, 60% RH. All of these dehumidifiers met the ENERGY STAR efficiency standards [1]. However the available information provided by manufacturers for these dehumidifiers does not allow residences to obtain better energy efficiency without a known room size at which the dehumidifier yields highest water removal for various operating zone relative humidity set-points which can be controlled by EnergyPlus program. Therefore, there is a need to carry out a simulation test to deduce the room size that enables each of these dehumidifiers to have highest energy efficiency in terms of water removal at various healthy relative humidity set-points. 935.29 kBAdobe PDFView/Open

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