﻿ Thermal and hydraulic calculation of water underfloor heating.
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# Water Underfloor heating Calculator

When specifying the area, take into account the necessary margins from the walls.
Units of measurement are square meters.
The area of the water underfloor heating
m2
Purpose of the calculated room Room assignment
The required air temperature in the calculated room.
The units of measurement are degrees Celsius.
Desired indoor air temperature
The temperature of the air in the room below.
If there is no room, specify 0.
The units of measurement are degrees Celsius.
The air temperature in the lower room
The step of laying the water underfloor heating pipe.
Units of measurement are millimeters.
Pipe pitch
mm
The type of pipes used in the water underfloor heating system, the outer diameter and wall thickness. Pipe type
The temperature of the liquid at the outlet of the boiler to the water underfloor heating system.
The units of measurement are degrees Celsius.
Liquid temperature at the inlet
The temperature of the liquid at the entrance to the boiler from the water underfloor heating system. On average, the temperature of the liquid at the entrance to the water underfloor heating system is 5-10% lower.
The units of measurement are degrees Celsius.
The temperature of the liquid at the output
The length of the pipe from the boiler to the calculated room "back and forth".
Units of measurement are meters.
Length of the supply line
meters
The approximate amount of heat needed to heat the room.
Units of measurement - Watts.
Room heat loss
W

mm
mm
mm

mm
mm
mm

## Thermal calculations

 Total heat flow 1277.6 W Specific heat flow in the upward direction 79.85 W/m2 Specific heat flow in the downward direction 10.01 W/m2 Total specific heat flow 89.86 W/m2 Total heat flow per linear meter 13.48 W/m Average liquid temperature 32.5 ℃ Maximum floor temperature 26.92 ℃ Minimum floor temperature 24.27 ℃ Average floor temperature The floor temperature is comfortable. 25.59 ℃

## Hydraulic calculations

 Pipe length 116.67 meters It is necessary to divide the room into 2 loops by 63.33 meters Thermal load on each loop 786.32 W Fluid flow in each loop 0.027 kg/s Fluid velocity The fluid velocity is normal. 0.237 m/sec Linear pressure losses in the loop Linear pressure losses are normal. 6895.17 Pa Total volume of liquid 13.19 liters

## Information on the purpose of the calculator

The online water underfloor heating calculator is designed to calculate the main thermal and hydraulic parameters of the system, calculate the diameter and length of the pipe. The calculator provides an opportunity to calculate the underfloor heating, implemented in a "wet" way with the arrangement of a monolithic floor made of cement-sand mortar or concrete, as well as with the implementation of a "dry" method, using heat-distributing plates. The device of the TP system by the "dry" method is preferable for wooden floors and ceilings.

If the maximum permissible values of the main parameters are overestimated, the calculator will indicate errors.

Heat flows directed from bottom to top are the most preferable and comfortable for human perception. That is why room heating with warm floors is becoming the most popular solution compared to wall-mounted heat sources. The heating elements of such a system do not take up additional space, unlike wall radiators.

Properly designed and implemented underfloor heating systems are a modern and comfortable source of space heating. The use of modern and high-quality materials, as well as correct calculations, allows you to create an efficient and reliable heating system with a service life of at least 50 years.

The underfloor heating system can act as the only source of room heating only in regions with a warm climate and using energy-efficient materials. In case of insufficient heat flow, the use of additional heat sources is mandatory.

The calculations obtained will be especially useful for those who plan to implement a underfloor heating system with their own hands in a private house.

For a more accurate calculation, be sure to contact qualified specialists in your region!

## General information on the results of calculations

• Total heat flow
• - The amount of heat generated in the room. If the heat flow is less than the heat loss of the room, additional heat sources are needed, for example, such as wall radiators.
• Heat flow in the upward direction
• - The amount of heat released into the room from 1 square meter of area in the upward direction.
• Heat flow in the downward direction
• - The number of "lost" heat and not participating in the heating of the room. To reduce this parameter, it is necessary to choose the most effective thermal insulation under the pipes of the water underfloor heating.
• Total specific heat flow
• - The total amount of heat generated by the water underfloor heating system from 1 square meter.
• Total heat flow per linear meter
• - The total amount of heat generated by the water underfloor heating system from 1 linear meter of pipe.
• The average temperature of the liquid
• - The average value between the design temperature of the liquid of the supply pipeline and the design temperature of the liquid of the return pipeline.
• Maximum floor temperature
• - The maximum temperature of the floor surface along the axis of the heating element.
• Minimum floor temperature
• - The minimum temperature of the floor surface along the axis between the pipes of the water underfloor heating.
• Average floor temperature
• - Too high a value of this parameter may be uncomfortable for a person . To reduce this parameter, it is necessary to increase the pitch of the pipes, reduce the temperature of the liquid or increase the thickness of the layers above the pipes.
• Pipe length
• - The total length of the water underfloor heating pipe, taking into account the length of the supply line. With a high value of this parameter, the calculator will calculate the optimal number of loops and their length.
• Thermal load on the pipe
• - The total amount of heat energy received from heat energy sources, equal to the sum of heat consumption of heat energy receivers and losses in heat networks per unit of time.
• Liquid flow rate
• - The mass quantity of the liquid intended to supply the required amount of heat to the room per unit of time.
• The speed of movement of the liquid
• - The higher the speed of the liquid, the higher the hydraulic resistance of the pipeline, as well as the noise level generated by the liquid. The recommended value is from 0.15 to 1m/s. This parameter can be reduced by increasing the inner diameter of the pipe.
• Linear pressure losses
• - Reduction of pressure along the length of the pipeline caused by the viscosity of the liquid and the roughness of the inner walls of the pipe. Excluding local pressure losses. The value should not exceed 20000Pa. It can be reduced by increasing the inner diameter of the pipe.
• Total liquid volume
• - The total quantity of liquid for filling the internal volume of pipes of the water underfloor heating system.

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