Data/hora: 19/06/2024 11:46:54

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 03/11/1993
Data da última atualização: | 03/11/1993
Autoria: | BOETTCHER, A.; MUHLBAUER, W.; REISINGER, G.
Afiliação: | Institute for Agricultural Engineering, Hohenheim University D - 7000 Stuttgart 70, Garbenstrasse 9.
Título: | Comparison of different plastic foil solar water heaters.
Ano de publicação: | 0
Fonte/Imprenta: | Garbenstrasse: s. d.
Idioma: | Inglês
Conteúdo: | Solar water heaters, commercially produced in industrial countries are in most cases too expensive for application in developing countries. A simple low-cost storange water heater was developed mainly for use in countries with high isolation, where houses are traditionally costructed with flat roofs. The storange collector basically consists of a water sack supported by insulation material, a frame made of aluminium and a transparent cover foil. The water sack is built up of a temperature resistant PTFE-PE foil tube. At both open ends the foil tube is clamped into clamping fixture and fixed to the frame. For increasing the absorptance an electrolytically blackened copper foil can be placed inside the water sack is 1 m in width and is commercially available up to a length of 10 m. The water volume amounts 30-70 1/m2. For reducing theheat losses at the back side the water sack is spread out on an aluminium laminated polyurethane foam plate. The U-value of that material is 0.4 W/m2K. Due to its high mechanical strength this insulation material can be used as a part of the frame. The top losses are reduced by a cover of highly UV-stabilized PE-EVA air bubble foil, which has an value of 3.2 W/m2K. Since the installation areas of the solar water heater are not always even, a levelling equipment is mounted underneath the frame.
Palavras-Chave: | Armazenagem; Plantas; Secagem solar.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (15391-1) - ADC - SP - -- - S1890 -  - S1890 - DIS