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Design integration of dedicated outdoor air system with variable refrigerant flow system.

Number: pap. 2439

Author(s) : RANE M. V., VEDARTHAM D. M., BASTAKOTI N.

Summary

Increase in energy consumption by Heating Ventilation Air Conditioning, HVAC sector and improvement in Indoor Air Quality, IAQ, according to ASHRAE standards has led to need of replacement of popular Variable Air Volume, VAV system with sustainable and cost effective systems. Variable Refrigerant Flow, VRF systems have emerged as energy efficient HVAC system in recent years, due to application of inverter driven variable speed compressors in its outdoor units, which offer good part load efficiency. In order to meet IAQ, Dedicated Outdoor Air Systems, DOAS have emerged as efficient systems where more Outdoor Air, OA, can be introduced in the conditioned space while limiting the load and energy required, especially for warm and humid climates. This paper investigates different DOAS configurations that can be integrated with VRF system to achieve thermal comfort and minimize life cycle cost. Various non-compressor based DOAS configurations in literature have been discussed. Cooling and Liquid Desiccant Dehumidification, LDD, of OA by Indirect Evaporative Cooling, IEC, is identified as a suitable option for integration with conventional air-conditioning systems. Psychrometric analysis of the configuration selected for integration with VRF system, for cities from each climate zone of India, is presented. Theoretical analysis for heat and mass transfer has been carried out based on patented nine enhanced passage aluminium extrusion for deployment in Mumbai. Overall heat transfer coefficient on outdoor air side is calculated as 13.89 W/m2K. Mass transfer coefficient on outdoor and indoor air side is obtained as 0.03 m/s and 0.04 m/s respectively. Assumed outdoor air conditions are 31.0 DBT and 80% rh. Water evaporated on indoor air side and water condensed in outdoor air side is obtained as 0.34 g/s and 0.37 g/s respectively. LMTD for the heat transfer process is obtained as 4.2°C for a counter flow heat and mass exchange. Energy and cost saving calculations suggest savings of 2,71 INR/day from heat recovery and 38.6% increase in COP of parallel VRF system.

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Pages: 10 p.

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Details

  • Original title: Design integration of dedicated outdoor air system with variable refrigerant flow system.
  • Record ID : 30019009
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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