Choosing the right radiator are one of the most important parts of a central heating installation, and a well-specified radiator is essential to ensure the homeowner does not waste money or energy on overheating their home.
Heat loss calculations are essential in order to establish the correct radiator output and size required for a particular room. The final heat loss figure (given in Watts) can be matched up with a radiator of a similar or higher output. If this figure is underestimated, the room will not reach the required temperature in the depths of winter, and the house will be under heated. If it is overestimated, the room will be overheated and uneconomical. Approximations of the sizing of the radiator in a room can be estimated by using a standard calculation but, for best accuracy, a qualified heating engineer or designer should be consulted.
When calculating the heating requirement of a room, it is important to consider other factors which can affect the rate of heat loss, for example:
Outdoor temperature. The amount of heat lost from a building can depend on its location.- The Highlands of Scotland compared to Sunny Cornwall.
Building location and wind conditions. Buildings situated in open space and in windy regions lose heat at a higher rate than identical buildings located in a settlement protected from extreme weather.
Age of building. Modern buildings are usually better insulated than old buildings.
Windows and glazing. High quality windows reduced the rate of heat transfer and cut the costs of heating for the homeowner.
Position of external walls. Rooms without any external walls will have a lower rate of heat transfer.
Indoor temperature. The purposes for which the room is used should be considered – the higher the required temperature is, the larger the radiator should be.
Heating parameters. In most cases heat loss figures are stated according to the industry standard EN442, i.e. water temperature, flow and return and the indoor temperature are calculated at the level of 75/65/20°C. If the installation operates within different parameters from the ones given or the indoor temperature is lower or higher than 20°C, correction factors must be used.
Rettig Purmo radiators have a large range of panel radiators to suit all types of situation.