Increasing solar gains by using hot water to heat dishwashers and washing machines
2007 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 27, 646-657 p.Article in journal (Refereed) Published
Seventy to ninety percent of the electric energy used by dishwashers and washing machines heats the water, the crockery, the laundry and the machine and could just as well be replaced by heating energy from solar collectors, district heating or a boiler. A dishwasher and a washing machine equipped with a heat exchanger and heated by a hot water circulation circuit instead of electricity (heat-fed machines) have been simulated together with solar heating systems for single-family houses in two different climates (Stockholm, Sweden and Miami, USA). The simulations show that a major part of the increased heat load due to heat-fed machines can be covered by solar heat both in hot and cold climates if the collector area is compensated for the larger heat load to give the same marginal contribution. Using ordinary machines connected to the hot water pipe (hot water-fed machines) and using only cold water for the rinses in the washing machine gives almost the same solar contribution; however considerably lower electrical energy savings are achieved. The simulations also indicate that improvements in the system design of a combisystem (increased stratification in the store) are more advantageous if heat-fed machines are connected to the store. Thus, using heat-fed machines also encourages the use of more advanced solar combisystems
Place, publisher, year, edition, pages
2007. Vol. 27, 646-657 p.
dishwasher, clothes washer, washing machine, domestic appliances, solar heating system, solar combisystem, solar hot water system, SDHW, system design
IdentifiersURN: urn:nbn:se:kth:diva-6493DOI: 10.1016/j.applthermaleng.2006.05.027ISI: 000241706500042OAI: oai:DiVA.org:kth-6493DiVA: diva2:11220
QC 201009162006-12-042006-12-042010-09-16Bibliographically approved