IEA HPP Annex 28 Test procedure and seasonal performance calculation of residential heat pump with combined space and domestic hot water production.

IEA HPP Annex 28Test procedure and seasonal performance calculation

of residential heat pump with combined space and domestic hot water production

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IEA HPP Annex 28

Introduction to the project

Workshop IEA HPP Annex 288th International Heat Pump Conference, Las Vegas, 30 May 2005

Carsten Wemhöner, Operating Agent IEA HPP Annex 28

Institute of Energy, University of Applied Sciences Basel

IEA HPP Annex 28 N 139

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Outline of the presentation

Outline of the workshop

Background of the project

Results of the state-of-the-art survey, conclusions

Overview of national contributions

Project structure of the IEA HPP Annex 28

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Background of IEA HPP Annex 28

Source: KWT Source: Stiebel Eltron

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Background of IEA HPP Annex 28

Solution to overcome this problem of missing comparability

Possibility of comparing different heat pump system layouts or heating systems (system calculation)

Energy labelling (indication at point of sale)

Uniform technical data (component testing)

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Background of IEA HPP Annex 28

Manufacturers: Provision of uniform technical data (competitiveness)

Designers: Technical information for system comparison

Customers: Product information for purchase decision (energy costs, environmental impact)

Policy makers: Key values to set targets in directives (Kyoto protocol)

based on uniform and transparent testing and calculation

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Objectives IEA HPP Annex 28

Test procedure with a minimum of testing expense Easy-to-use calculation methods

as recommendation for standardisation committees

for combined operating heat pump systems for space heating and domestic hot water production

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Objectives IEA HPP Annex 28

Transparent comparison of different heating systems

Reduction of trade barriers

Stimulation of technology improvements

Consumer confidence

Promotion of HP as environmentally sound technologies

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Facts IEA HPP Annex 28

Participants: AT, CA, CH (operating agent), DE, FR, JP, NO, SE, USA

Information: http://www.annex28.net

Project time: Jan 2003 – May 2005Final report: October 2005

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Structure of IEA HPP Annex 28

Task 1: State-of-the-art survey

Task 2: Test procedure with minimum of testing expense

Systems on the market and under development Existing standards for combined operating systems

Task 3: Easy-to-use calculation method

General to cover different system configurations on the market

Enough data to perform the seasonal performance calculation

"Hand calculation method" without extensive computation Transparent method on the basis of publicly available data

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State-of-the-art survey - markets

Europe:

North-America

Mostly alternate operating systems Some simultaneous operating systems, research activities

Japan

Mostly simultaneous operating systems with desuperheating Air-to-air heat pumps for combined air-conditioning/DHW

Little combined operation Market introduction of system with combined floor heating/DHW

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State-of-the-art survey - standards

Europe

North-America

Testing standards for single operation modes heating and DHW European calculation method under development, national regulations

Japan

Testing and calculation for single operation modes heating and DHW Combined operation for Air-to-air heat pumps with desuperheater

Testing and calculation for single operation modes Calculation by adaptation of American standard methods

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Conclusions - Scope

Alternate and simultaneous combined operating systems: Alternate: switching of the heat pump from space heating to

DHW operation

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Alternate operating system layout

Source: WPZ Töss

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Conclusions - Scope

Alternate and simultaneous combined operating systems:

Simultaneous: space heating and DHW heat production at the same time, e.g. by

Desuperheating of compressed refrigerant Subcooling of condensed refrigerant Cascade system layout Extraction of heat from the heating system supply line

Alternate: switching of the heat pump from space heating to DHW operation

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Simultaneous operating system layout

Source: TU Dresden

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Conclusions - Scope

Alternate and simultaneous combined operating systems:

Simultaneous: space heating and DHW heat production at the same time, e.g. by

Desuperheating of compressed refrigerant Subcooling of condensed refrigerant Cascade system layout Extraction of heat from the heating system supply line

Hydronic and air distribution system

Alternate: switching of the heat pump from space heating to DHW operation

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Conclusions – System boundary

Generator with attached storages (heating buffer, DHW) and back-up generators (e.g. supplementary electrical resistance heating)

Source: prEN 14335 general part

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Conclusions - Testing

Based on existing standards for single operation modes

Heat pump

DHW storage/Instantaneous water heater

Back-up heater

Black-box testing System testing for highly integrated layouts

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Conclusions - calculation Based on bin-methodology

Relative energy requirement in the bin corresponds to ratio of bin areas(weighting factor)

Operation conditions at operating point valid for the entire bin

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National contributions - focus

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Structure of the Workshop

Part 1: Introduction

Part 2: Calculation method

Part 4: Test procedure

Part 5: Conclusions, Implications and Discussion

Part 3: Experiences from systems in the field monitoring

Coffee break

Transparencies can be downloaded at Annex 28 website http://www.annex28.net

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Thank you for your attention!