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  3. Dishwasher with Heat Pump Dishwasher with Heat Pump

Dishwasher with Heat Pump

Household appliances such as dishwashers consume high amounts of electrical energy but also show a high potential for reducing the energy consumption in the daily life.

Brief information

School:

Engineering and Architecture

Status:

Completed

Period:

20.01.2010 - 31.12.2011

Overview

Conventional dishwashers require large amounts of high-quality electrical energy. The largest share of this energy is used for heating the rinsing water, the dishes and the housing. The heating is accomplished using an electrical resistance heater. It therefore makes sense to implement measures that reduce the electrical energy required for heating purposes.

For this CTI project, a heat pump for dishwashers was developed that reduces the electrical energy demand of the dishwasher. The entire system is heated with the process water, which is heated in the condenser of the heat pump. The evaporator is embedded within a latent heat storage. By using the solidification enthalpy of the phase change, the overall size of the heat source can be minimized.

As an additional measure, a modified drying process was developed in combination with the heat pump. This process positively influences the efficiency of the heat pump by lowering the inner temperature lift of the heat pump. Through these measures the electrical energy demand can be reduced by 30-50% compared with today’s standard dishwasher models.

Aufgeklappter Geschirrspüler mit Wärmepumpe, © Hochschule Luzern - Technik & Architektur
Eisspeicher und Kondensator des Wärmepumenaggregates, © Hochschule Luzern - Technik & Architektur
Schema der Integration einer Wärmepumpe in einem Geschirrspüler, © Hochschule Luzern - Technik & Architektur
Wärmepumpenaggregat eines Geschirrspülers, © V-ZUG AG
Heat pump unit of a dishwasher, © V-ZUG AG
Opened dishwasher with heat pump, © Lucerne University of Applied Sciences and Arts
Ice storage and condenser of the heat pump unit, © Lucerne University of Applied Sciences and Arts
Technical schema of an integrated heat pump in a dishwasher, © Lucerne University of Applied Sciences and Arts
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Facts

Type of project

Forschung

Internal organisations involved
  • CC Thermal Energy Systems and Process Engineering
External project partner
  • V-Zug AG
Funding
  • KTI-HSLU als Hauptgesuchsteller/in
  • Private / Stiftungen
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Persons involved: internal

Project manager
  • Beat Wellig
Member of project team
  • Werner Birrer
  • Ernesto Casartelli
  • Stefan Flück
  • Lukas Gasser

Brief information

School:

Engineering and Architecture

Status:

Completed

Period:

01/20/2010 - 12/31/2011

Project Head

Prof. Dr. Beat Wellig

Lecturer

+41 41 349 32 57

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Lucerne University of Applied Sciences and Arts


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info@hslu.ch

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