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Comparison of different refrigerant circuit layouts for two condensers with air and water as heat sinks.

Author(s) : GONZÁLVEZ-MACIÁ J., MUÑOZ M., MARTÍNEZ-BALLESTER S., et al.

Summary

HVAC hydronic installations with simultaneous heating and cooling demand are usually projected by using two different energy production systems i.e. a chiller and a boiler or heat pump. However, there is a commercial demand for project simplification and plug & play installations. Because of that many air conditioning and heat pump manufacturers are offering units which are able to produce chilled and hot water at the same time performing an actual heat recovery from one zone of the building to another. These are so called water-to-air-to-water heat pumps. Basically they are heat pumps which integrate an evaporator for chilled water production, a condenser for hot water production and an air-coil to be used as alternative heat/sink for the unbalanced load. Many times, the commercial available products are not fulfilling the expectations in terms of cooling and heating capacities control. It is difficult to design the suitable frigorific circuit and regulation algorithm in a way that variable simultaneous cooling and heating demand can be satisfied at the same time. Some possible arrangements of the refrigerant circuit are compared by means of simulation. These possible arrangements of the refrigerant circuit are three: serial, parallel and on/off circuit. The serial configuration consists in two condensers connected in the same refrigerant line, the parallel configuration consists in two condensers connected in parallel and the on/off configuration consists of alternating the operation of the condensers in order to satisfy demand so that when one works the other is in standby. The three arrangements of the refrigerant circuit are simulated by software "IMST-ART" comparing range of partial load covered and energetic efficiency of the different options as function of partial load ratio using the new concept of Total COP.

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Details

  • Original title: Comparison of different refrigerant circuit layouts for two condensers with air and water as heat sinks.
  • Record ID : 2011-0126
  • Languages: English
  • Source: IIR/Eurotherm sustainable refrigeration and heat pump technology conference. Proceedings of the Eurotherm Seminar No. 88, Stockholm, Sweden, June 13-16, 2010.
  • Publication date: 2010/06/13

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