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Reducing the global warming impact of a household heat pump dishwasher using hydrocarbon refrigerants
ASKO Appliances AB, Lidköping.
Norwegian University of Science and Technology.
2016 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 99, 1295-1302 p.Article in journal (Refereed) Published
Abstract [en]

In a heat pump dishwasher, the dishware and the dishwater constitute the heat sink and a water tank filled with water, which can freeze, the heat source. A simulation model developed and validated earlier was modified and used in a parameter study to determine the lowest total electricity usage for the refrigerants R134a, R290, and R600a with different cylinder volumes of the compressor. The total equivalent warming impact (TEWI) was calculated in three regions with different CO2 eq. emissions from electricity generation, i.e., Sweden, Europe (OECD), and Europe (Non-OECD), for small, medium-sized, and large households. In regions with low CO2 eq. emissions from electricity generation, the total TEWI of a heat pump dishwasher is the lowest with R600a and the highest with R134a, and in regions with high CO2 eq. emissions, the total TEWI is the lowest with R600a and the highest with the conventional electrical element.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 99, 1295-1302 p.
Keyword [en]
Household appliances, Natural refrigerant, Electrical reduction, TEWI, GWP
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
URN: urn:nbn:se:kau:diva-48130DOI: 10.1016/j.applthermaleng.2016.02.018OAI: oai:DiVA.org:kau-48130DiVA: diva2:1080955
Available from: 2017-03-13 Created: 2017-03-13 Last updated: 2017-04-21Bibliographically approved
In thesis
1. Apply heat pump systems in commercial household products to reduce environmental impact: How to halve the electricity consumption for a household dishwasher
Open this publication in new window or tab >>Apply heat pump systems in commercial household products to reduce environmental impact: How to halve the electricity consumption for a household dishwasher
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In the household appliance industry, heat pump systems have been used for a long time in refrigerators and freezers to cool food, and the industry has driven the development of small, high-quality, low-price heat pump components. In the last few decades, heat pump systems have been introduced in other household appliances, with the express purpose of reducing electricity consumption. Heat pump tumble dryers have been on the market since 2000 and dominate the market today. A heat pump dishwasher was introduced on the market in 2014 and a heat pump washing machine in 2016. The purpose of adding a heat pump system in these three products was to decrease electricity consumption.

Papers I and II used a methodology where transient simulation models were developed and used to increase knowledge about how to decrease electricity consumption for a tumble dryer and a dishwasher by adding a heat pump system. Papers II to V showed that a lower electricity consumption and lower global warming potential together with an energy-efficient drying method, where no humid air evacuates to the kitchen, give a heat pump dishwasher competitive advantages compared to any conventional dishwasher currently on the market. Using simulations, this dissertation concludes that a future commercial heat pump dishwasher, using R600a as a refrigerant, will reduce electricity consumption and total equivalent warming impact (TEWI) by 50% compared to the conventional dishwasher.

The willingness from the customer chain to pay extra for this heat pump dishwasher is because of the decreases electricity consumption and the fact that no humid air evacuates to the kitchen. This willingness makes the heat pump dishwasher to a variant which have possibility to succeed on the future market.

The challenge for the manufacturer is to develop and produce a high-quality heat pump dishwasher with low electricity consumption, predict future willingness to pay for it, and launch it on the market at the right moment with the right promotion in order to succeed.

Abstract [en]

The competition in the household appliances industry is strong. Manufacturers are continuously trying to develop, produce and sell product functions and features with good profit. To continually develop new features that the customer chain is willing to pay for is a key factor for a manufacturer to survive.

In this study has a heat pump system been added as a new feature to a dishwasher. The first heat pump dishwasher was introduced on the market in 2014 and the heat pump system was only used to heat the dishwasher. Comparing that first heat pump dishwasher was a new closed drying method introduced in this study where no humid air evacuates to the kitchen. Experiments and simulations showed that a dishwasher with an added heat pump system can decrease the total electricity consumption by 50% when cleaning and drying the dishware comparing to an on market conventional dishwasher.

The willingness from the customer chain to pay extra for this heat pump dishwasher is because of the decreases in electricity consumption and the fact that no humid air evacuates to the kitchen. This willingness makes the heat pump dishwasher to a variant which have possibility to succeed on the future market.

Place, publisher, year, edition, pages
Karlstads universitet, 2017
Series
Karlstad University Studies, ISSN 1403-8099 ; 2017:10
Keyword
household appliance, electricity consumption, heat pump, environmental impact
National Category
Energy Engineering
Research subject
Environmental and Energy Systems
Identifiers
urn:nbn:se:kau:diva-48132 (URN)978-91-7063-759-9 (ISBN)978-91-7063-760-5 (ISBN)
Public defence
2017-05-05, 9C203, Nyquistsalen, Karlstad, 09:15 (Swedish)
Opponent
Supervisors
Available from: 2017-04-13 Created: 2017-03-13 Last updated: 2017-11-17Bibliographically approved

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