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  2. Energy Efficient Dishwasher Energy Efficient Dishwasher

Energy Efficient Dishwasher

V-ZUG AG has developed and produced household appliances for more than 100 years and is the Swiss market leader. Ever since its foundation the company strives to introduce new and innovative household appliances into the market.

Brief information

School:

Engineering and Architecture

Status:

Completed

Period:

01.10.2012 - 31.12.2014

Overview

In modern dishwashers, heat pumps are integrated for heating up the water in order to reduce the consumption of electrical energy compared to conventional dishwashers with electrical resistance heating. Nevertheless, analyses have shown that there is still unused potential to shorten the duration of the dishwashing program, lowering both the electrical power and the water consumption. Many of these new insights and findings can also be adapted to dishwashers without heat pumps.

The two competence centers “Thermal Energy Systems and Process Engineering” and “Fluid Mechanics and Hydraulic Machines” support the V-ZUG AG in the optimization of the heat pump and the drying process as well as in the development of a new water pump.

In the area of optimizing the heat pump and the drying process, different mathematical-physical simulation models were developed. With the aid of these models it is possible to investigate and assess different concepts and configurations. In this way, the most promising measures can be identified and implemented very quickly. Furthermore, the effort for experimental studies can be reduced significantly.

For example, one result is a new type of condenser that is available for heat pumps. It notably reduces the logarithmic temperature difference of the heat transfer due to increased heat transfer coefficients. Furthermore, an evaporator was developed that is embedded within a latent heat storage filled with a phase change material.

For drying dishes, a new drying concept was developed, which provides targeted cooling of one of the dishwasher walls dependent on the temperature of the drying air. The goal is to avoid mist in the dishwasher for the following reasons. On one hand mist lowers the heat and material transfers and, on the other hand, it remoistens already dry dishes. This drying concept is particularly suitable for dishwashers without heat pumps.

During the entire dishwashing program, the water pump is in operation and is responsible for a considerable share of the energy consumption in modern, efficient dishwashers. By means of simulations (Computational Fluid Dynamics CFD), a new radial pump with a higher hydraulic efficiency was developed and designed. As well as the increased hydraulic efficiency it is also more stable when pumping fluids with air entrained, such as foams.

The results of this project helped V-ZUG AG to extend their technological leadership in the field of innovative and energy efficient household appliances.

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

Type of project

Forschung

Internal organisations involved
  • CC Fluid Mechanics and numerical methods
  • CC Thermal Energy Systems and Process Engineering
External project partner
  • V-Zug AG
External project funder
  • Kommission für Technologie und Innovation (KTI)
Funding
  • KTI-HSLU als Hauptgesuchsteller/in
  • Private / Stiftungen
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Persons involved: internal

Project manager
  • Stefan Flück
Member of project team
  • Werner Birrer
  • Ernesto Casartelli
  • Lukas Gasser
  • Silvan Hug
  • Mirko Kleingries
  • Thomas Nussbaumer
  • Mario Rosso
  • Beat Wellig
  • Jörg Worlitschek
  • Christoph Zumbühl

Brief information

School:

Engineering and Architecture

Status:

Completed

Period:

10/01/2012 - 12/31/2014

Project Head

Stefan Flück

Research Associate

+41 41 349 35 41

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