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Detailed monitoring analysis of two residential NZEBs with a ground-water heat pump with desuperheater.

Number: pap. 3471

Author(s) : DERMENTZIS G., OCHS F.

Summary

Two new, residential, and high performance buildings were constructed according to Passive House standard in Innsbruck, Austria (with cold winters and mild summers). The two multi-family houses consist of 26 apartments - 16 in the north and 10 in the south building. The goal of the project was to achieve net zero energy building (NZEB) standard, which was defined in this project as the annual balance between the electricity consumed for heating and ventilation (excluding household appliances), and the electricity produced by renewable sources. Thus, a heat pump, solar thermal collectors, photovoltaics (PV) and ventilation units with heat recovery were installed. The two stage ground-water source heat pump with a power of 58 kW (at W10/W35) includes desuperheating. The available roof space of the north building was covered by a solar thermal system with 74 m2 and PV with 52.5 m2 (8.5 kWp). An additional PV system of 99.8 m2 (16 kWp) was placed in the roof of the south building. The ventilation units were centralized (three in total) including heat recovery. The heating distribution system was floor heating, and a heat exchanger was installed in each flat for domestic hot water (DHW) supply. A four pipe distribution system was used to minimize the distribution losses; two pipes for the DHW (flow temperature of 52°C) and two pipes for the space heating (with flow temperature of 35°C). Therefore, stratification was obtained in the 6000-liter storage to improve energy performance, since the heat pump can operate at a low sink temperature for supplying space heating. A detailed monitoring system was installed consisting of 58 temperature sensors, 12 humidity sensors, 2 pressure sensors, 37 signals (e.g. controllers, valves, pumps, etc.), 22 heat meters, 7 electricity meters, and 2 volume flow meters. The main focus was the energy performance of the HVAC systems. The thermal comfort of the south building was monitored, too. The operation of a monitoring system has started in November 2015. In this paper, two years of monitoring results are analyzed and discussed. The energy performance of the technical system and each subsystem is presented in detail. The importance of quality assurance control e.g. with monitoring is highlighted. In addition, the difference in annual heating demand showed the importance of at least two years of monitoring for the new constructions. Moreover, the present study enhances the discussion about evaluation of NZEBs with a monitoring example from central Europe.

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Details

  • Original title: Detailed monitoring analysis of two residential NZEBs with a ground-water heat pump with desuperheater.
  • Record ID : 30024889
  • Languages: English
  • Subject: Environment
  • Source: 2018 Purdue Conferences. 5th International High Performance Buildings Conference at Purdue.
  • Publication date: 2018/07/09

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