![]() ![]() ![]() The limitation of DCHME is the contamination of the streams depending on the degree of miscibility. DCHME is a device in which the two process streams are flowing and contacting each other to exchange heat and mass between these two streams, which can be gas-solid, gas-liquid, liquid-liquid, liquid-solid, or solid-solid streams. The objective of this study is to develop a mathematical model to be used as a tool for designing DCHME and to be applied as a sub-function of the model predictive control system to predict the effectiveness and dependent parameters of DCHME under the different load conditions and its various input parameters.įor more than 100 years ago, direct contact heat and mass exchangers (DCHME) have been widely used in various industries, including chemical process plant, food, and beverage industry, geothermal heat recovery, seawater desalination, waste heat recovery, energy storage systems, production of steam generation for the Rankine power cycle, air conditioning and refrigeration industries, and many so forth. Thus, this model can reflect both heat and mass transfer behavior in every spatially distributed physical system. This study developed a mathematical model for these two types of exchangers by using a discretized volume with distributed lumped-parameters method instead of using the conventional log mean enthalpy difference (LMHD) and NTU-effectiveness method. Based on their structure, DCHME can be categorized into two groups two fluids direct contact (TFDC) exchanger and two direct contacts with one non-contact fluid (TDCONF) exchanger. Hence, DCHMEs are widely used in numerous applications in various industries, including the air conditioning industry for cooling and dehumidification and heating and humidification. DCHME has a capability to exchange of both heat and mass between the two fluids in the same process. A direct-contact heat and mass exchanger (DCHME) has many advantages over a traditional surface-type heat exchanger, including a high heat transfer coefficient, simplicity of design, and low OPEX and CAPEX. ![]()
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