Views: 30 Author: 1stsunflower Publish Time: 2019-11-14 Origin: Site
Solar space heating systems are an effective and excellent way to reduce costly energy bills during your heating season.
Solar home heating system works alongside your current heating system to use the sun's energy to reduce your consumption of oil, propane, or other fossil fuels. If the solar system cannot provide adequate space heating, an auxiliary or back-up system like gas heater provides the additional heat.
Traditionally used with solar evacuated tube collectors, these systems work to provide free, solar heating for your home throughout your entire heating system.
How to Design a Solar Heating System for Home?
A client in Spain who wants to set up a floor heating system for his house in winter months and at the same time, system needs to provide domestic hot water all year round.
Design Request
An economical solution for the realization of a project of houses equipped with solar water heater.
a) Domestic hot water (+/- 80lt / day)
b) Underground heating (+/-86m²) we need only January - February - March - November and December
Design Basis
This project is located in in the south of Spain. We use the meteorological data of Malaga as the design basis.
The entire system must provide 80L of hot water every day throughout the year, and provide enough heat energy for room during winter months.
According to sun insolation in Malaga, we are going to use three 30-tube collectors to heat the 300L water tank. System specification is below.
Product List
No. | Name | Model | Quantity | Unit |
1 | Solar collector | SFB305818 | 3 | sets |
2 | Pressure tank | SFO300CC | 1 | set |
3 | Controller | SR658 | 1 | set |
4 | Circulating pump | Wilo RS15/6 | 2 | sets |
5 | Expansion vessel | 19L | 1 | pc |
6 | three-way solenoid valve | DN20 | 1 | pc |
7 | Air vent valve | R88 | 2 | pcs |
8 | Check valve | DN20 | 4 | pcs |
9 | Filter valve | DN20 | 4 | pcs |
10 | Hot ball valve | DN20 | 2 | pcs |
11 | Connectors between collectors | DN22 | 2 | pcs |
System Diagram
Design Feature
This is an automatic control system, at any time of within the year, solar collectors preferentially heat the tank. We can set the maximum water temperature of the tank to 60 degrees Celsius (temperature can be set by the controller according to customer request) these hot water meet demand of one household.
During January - February - March - November and December, When the water tank temperature reaches for example 60 ° C, R4 automatically switches to the heat underground floor.
When there is excess hot water in the tank, you also can heat the underground by switching on R2
Question of Customer
So far the client raised a question. How does the system work if it hits a rainy day? The customer is a very careful person and all kinds of situations have been taken into consideration. This is indeed a question worth considering.
How to solve it?
On sunny days, the solar energy provides enough heat for the collector to heat the tank. On cloudy or rainy days, when solar energy is not enough, the backup power can be used to heat tank.
1. When the solar energy is insufficient, you can start the electric heating in tank to heat the water inside.
2. Add a backup equipment to the entire system, such as gas water heaters, electric water heaters. When the solar energy is insufficient, start the backup energy to heat tank.
The customer is very satisfied with the design of the whole system. Because the system meets the customer's needs, and also solves the customer's concerns with reasonable prices.
Selecting the appropriate solar space heating system depends on factors such as the site, design, and heating needs of your house.
The local climate, the type and efficiency of the collector(s), and the collector aperture area determine how much heat a solar heating system can provide.
Most buildings require a back-up heating system. Supplementary or back-up systems supply heat when the solar system cannot meet heating requirements. Backups can range from a wood stove to gas heater, electric heater etc.
