Solar water heating systems for houses

Sep 9, 2017   //   by admin   //   Knowledge Base  //  No Comments

Solar Water heaters or SWH systems are special models created to utilize solar energy for obtaining hot water for various purposes. Solar water heating (SWH) systems consist of numerous innovations and considered as one of the renewable energy technologies that have been well conventional used for many years. There are numerous places where   SWH has been widely used including India all over the world like  in Turkey , China, Austria, Cyprus, Israel, Japan, Austria , China and Austaralia. It is observed to be of two kinds. One is “closed coupled systems” and the other is “Pump circulated systems”.

In a “close-coupled” SWH system the storage tank is parallel mounted above the solar collectors on the topside. The hot water naturally rises into the tank with the help of thermo siphon flow. In a “pump-circulated” system the storage tank is floor or ground mounted. It is below the altitude of the collectors and with the help of a circulating pump water moves or heat transfer fluid is used in between the collectors and the tanks. It is specially designed to deliver hot water for complete year. One of the disadvantage is that in winter sometimes there would not be sufficient solar heat gain for the production of hot water.

Solar water heaters are also active or passive in nature. An active system electric pump is used to circulate the heat-transfer fluid whereas in a passive system no pump is required. How much quantity of hot water a solar water heater can produce is depending on the size and type of the system, availability of solar rays ( Sun) at the place, appropriate fitting, and the angle and direction of the collectors.

A solar heating system for houses.

Solar heater system

Solar Water heating :

Hot water heated through the sun rays is used in numerous ways. Although possibly used in a residential setting in order to offer household hot water and producing electricity as well. It is designed in a appropriate manner   for sunny days. It is of great advantage as it is simple to use and comparatively cheaper can be very well used for places with the hot climatic conditions . Solar energy has promoted by many countries like China, Europe & Japan . It follows the heating process via system set up in houses for further use of heat produced.

For heating water by solar energy a system is set up , here a collector is generally fixed firmly to a roof / wall facing the direct sun rays on a working fluid. This working fluid is either pumped through an active system or entered through a passive system by means of natural convention . A collector is an insulated box made up of simple glass material. A flat metal sheet attached with it act as a solar absorber . It is then connected with a copper pipe and set of dark colored metal tubes surrounded by a glass cylinder also called as vacuum.

Residential solar thermal established as mentioned before passive or compact and active or pumped systems comprises of an auxiliary energy source i.e an outer source electric heating system , outer gas connection or a central heating element using fuel oil. A minimum temperature is maintained in a tank at 55 °C . It becomes active only when water persuaded in the tank will fall below this maintained temperature. In this way hot water can be available most of the time.

Solar water heating and hot-water central heating system can also used in combination. Solar heat will either be determined in a pre-heating tank that supply into main tank where heat is generated through a central heating mechanism. Else the solar heat exchanger will put back the minor heating element and the higher element will stay behind in existing place in order to supply for any type of heating at times when solar energy is unavailable . The main need of central heating mechanism is during night and during winter season due unavailability of solar power. Thus solar water heating system can produce up 85 % of useful domestic hot water.

In India Banglore is emerged in first place to deploy solar water heating mechanism .A single heater can generate up to 200 MW per day. Moreover it is also among the first in reducing rebate of 50 on monthly electricity bills in placing an incentive mechanism for residents using roof-top thermal systems. These systems ate paramount for the rest of the structures as well.

Another city , in western India Pune also built up solar water heaters for households and promote its installation.

 

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