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IEA HPP Annex 28 N 140. IEA HPP Annex 28 Calculation of compact units. Workshop IEA HPP Annex 28 8 th International Heat Pump Conference, Las Vegas, 30 May 2005 Thomas Afjei, Institute of Energy, University of Applied Sciences Basel. Outline of the presentation. Introduction compact units.

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iea hpp annex 28 calculation of compact units

IEA HPP Annex 28 N 140

IEA HPP Annex 28Calculation of compact units

Workshop IEA HPP Annex 28

8th International Heat Pump Conference, Las Vegas, 30 May 2005

Thomas Afjei, Institute of Energy,

University of Applied Sciences Basel

outline of the presentation
Outline of the presentation
  • Introduction compact units
  • System layout of compact units
  • Approach for the calculation
introduction compact units
Introduction compact units
  • Background
  • In low- and ultra-low energy dwellings, significantly reduced heating energy requirement
  • Share of domestic hot water energy requirement increasing up to 50%

(ultra-low energy houses)

  • Air-tight buildings => usually equipped with mechanical ventilation system with heat recovery
  • High insulation and high passive solar gains

=> eventually comfort cooling demand in summertime

conclusion system layout
Conclusion system layout
  • Compact unit
  • Highly integrated system layout with core elements
    • Heat pump
    • Domestic hot water storage
    • Ventilation heat recovery system
  • Optional solar collector
  • Optional cooling function in summertime
  • Air heating systems and/or systems with hydronic distribution
consequences calculation
Consequences calculation
  • Heat recovery

Energy requirement:

  • Reduction of energy demand by recovery of ventilation losses
  • Electrical expense for the operation of the ventilation system

Source temperature:

  • heat recovery influences source temperature of the heat pump
  • ground-to-air heat exchanger influences source temperature
assumptions calculation
Assumptions calculation
  • Operation

Heating energy requirement is covered in the order:

  • heat recovery (running through in the heating period)
  • heat pump
  • back-up heater

Domestic hot water energy requirement is covered in the order:

  • solar collector (optional)
  • heat pump
  • back-up heater
additional input data for compact units

temperature difference outside-supply air temperature difference return-outside air

OA =

Temperature change coefficient

Additional input data for compact units
  • Heat recovery:
    • key value: temperature change coefficient
  • mass flow rates
  • electricity input for ventilation
additional input data for compact units9
Additional input data for compact units
  • Solar energy system:
    • solar collector characteristics, meteo data
  • Ground-air heat exchanger:
    • outlet temperature (if not already considered in performance characteristics, see testing method HTA Lucerne)
calculation method compact units

Design indoor temperature

HP

HP

S

HR

HP

OP3

S

HP

Balance point temperature

Balance point temperature

HR

HP

design outdoor

temperature

HP

HR

S

BU

BU

calculation method compact units

Upper ambient temperature for heating

OP4

  • Domestic hot water covered by heat pump and back-up
  • Heating requirement covered by heat pump and back-up
  • heat recovery
    • Reduction of heating energy requirement
    • lower inlet temperature to heat pump
  • domestic hot water energy requirement partly covered by solar contribution

(optional)

OP2

OP1

HP

ambient dry bulb temperature [°C]

DHW

Space Heating