Energetic, economic and environmental analysis of a health-care facility HVAC system equipped with a run-around membrane energy exchanger

Run-Around Membrane Energy Exchanger (RAMEE) is a novel heat and moisture recovery system that consists of two separate supply and exhaust exchangers coupled with an aqueous salt solution flow. The salt solution transfers energy (heat and moisture) in a closed loop between outdoor ventilation air and the exhaust air from buildings. The system performance is a function of the flow rate of the salt solution and ventilation air and the outdoor air conditions. The dependency of system performance on the solution flow rate and the outdoor conditions requires adjustment of the appropriate flow rate which gives the optimal system performance at any specific outdoor condition. In this paper, the RAMEE is simulated for a hospital building in four different climates using TRNSYS and MATLAB computer programs. The steady-state RAMEE can reduce the annual heating energy by 60% in cold climates and annual cooling energy by 15–20% in hot climates. The RAMEE has an immediate payback in cold climates and a 1 to 3-year payback in hot climates depending on the pressure drop across the exchangers. Finally, the RAMEE reduces greenhouse gas emission (CO2-equivalent) by 25% and 10% in cold climates and hot climates, respectively.

[1]  M. Orme.  Estimates of the energy impact of ventilation and associated financial expenditures , 2001 .

[2]  Carey J. Simonson,et al.  Air-to-air exchangers , 2003 .

[3]  R. Besant,et al.  Steady-state performance of a run-around membrane energy exchanger (RAMEE) for a range of outdoor air conditions , 2011 .

[4]  J. Niu,et al.  Effectiveness Correlations for Heat and Moisture Transfer Processes in an Enthalpy Exchanger With Membrane Cores , 2002 .

[5]  Standard Ashrae.  Thermal Environmental Conditions for Human Occupancy , 1992 .

[6]  Weiwei Liu,et al.  Evaluation program for the energy-saving of variable-air-volume systems , 2007 .

[7]  Carey J. Simonson,et al.  Heat and Moisture Transfer in Desiccant Coated Rotary Energy Exchangers: Part I. Numerical Model , 1997 .

[8]  Frank P. Incropera,et al.  Fundamentals of Heat and Mass Transfer , 1981 .

[9]  Carey J. Simonson,et al.  Application of neural networks to predict the transient performance of a Run-Around Membrane Energy Exchanger for yearly non-stop operation , 2012 .

[10]  Carey J. Simonson,et al.  Performance testing of a counter-cross-flow run-around membrane energy exchanger (RAMEE) system for HVAC applications , 2010 .

[11]  R. Besant,et al.  Numerical model and effectiveness correlations for a run-around heat recovery system with combined counter and cross flow exchangers , 2009 .

[12]  R. C. Weast.  CRC Handbook of Chemistry and Physics , 1973 .

[13]  R. Besant,et al.  Transient behavior of run-around heat and moisture exchanger system. Part І: Model formulation and verification , 2009 .

[14]  Yi Jiang,et al.  HEAT AND MASS TRANSFER IN A MEMBRANE-BASED ENERGY RECOVERY VENTILATOR , 1999 .

[15]  Mohammad Rasouli,et al.  Applicability and optimum control strategy of energy recovery ventilators in different climatic conditions , 2010 .

[16]  H. Hemingson.  The impacts of outdoor air conditions and non-uniform exchanger channels on a run around membrane energy exchanger , 2010 .

[17]  Carey J. Simonson,et al.  Transient behavior of run-around heat and moisture exchanger system. Part IІ: Sensitivity studies for a range of initial conditions , 2009 .

[18]  Carey J. Simonson,et al.  Application of neural networks to predict the steady state performance of a Run-Around Membrane Energy Exchanger , 2012 .

[19]  Özden Ağra,et al.  Determining the best type of heat exchangers for heat recovery , 2010 .

[20]  Means.  Means mechanical cost data , 1983 .