Design of hot water-supply using renewable energy sources
Abstract
Design of hot water-supply using renewable energy sources
Incoming article date: 22.04.2013"Application of solar energy in supplying various infrastructure units is urgent these days. Traditionally these were the centralized urban heating systems, which were used for heating buildings. The suggested heating system is composed of solar collectors with a total area of 44.16 m2 and with a volume flow of hot water to the consumer of 1.5 m3/h. Computer-aided heating circuit consists of traditional circuits, composed of solar collectors, circulation pump and a lamellar heat exchanger. Additionally, the scheme is extended by a fixed temperature water tank and a circuit, which interfaces the heating systems. They will be in their turn separated by a heat exchanger. The equipment also provides an opportunity of organizing a reverse pairing with the heating systems to return the excess heat into the network. This scheme has several modes of operation. In the conditions of nighttime, cloudy afternoon, light fog or smog water heating is provided by a central source. If during daytime, while being heated directly by the sun the water gets overheated the overheated water discharge mode is switched on automatically to discharge excess heat to a central heating system. The scheme provides for a “solar connectors and central source of heat parallel operation mode” to maintain the desired temperature, for example in the morning. According to the results of observations the share of water heating due to the solar collectors in summer is on average about 75%. Shared usage of central source of heat and solar collectors allows to efficiently use the available energy resources."
Keywords: renewable energy sources; solar collectors; computer-aided heating circuit; reverse pairing with the heating systems; efficient using of the available energy resources