new simulation studie

8/3/2019 New Simulation Studie

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Benefits of Floor Heating ControlIndividual Room Temperature Control In Hydronic FloorHeating Applications Simulation Studies, August 2003Danfoss Floor Heating Hydronics


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Benefits of Floor Heating Control

Personal Thermal Comfort

oom temperature is a main factor for personal thermal comfort

The desired room temperature depends on activity, clothing, and personal taste

Desired temperatures varies for each room in the house

Kitchen ~ 20 C

Bedroom ~ 17 C

Bathroom ~ 23 C

Living room ~ 20 C


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How Do We Achieve Optimal Personal Thermal Comfort ?

In order to achieve the desired temperature in each room

it must be possible for the user to define/set the

temperature in each room

It must be possible to differentiate temperatures between

the rooms, - e.g. typically the user wishes the bathroom to

be warmer than the bedroom

The heating system should at all times supply the correct

amount of energy needed to each room so that large

fluctuations resulting in the room being too warm or too cold

is avoided

Optimal comfort is achieved when the user has exactly the

temperature desired in each room of the house


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Individual Room Temperature Control

Desired temperature in bathroom

Desired temperature in living room

Desired temperature in bedroom

Temperature without individual room control

Temperature with individual room control

Hour

C temperature


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Individual Room Temperature Control Conclusion

In order to fulfill the desire for optimal personal thermal comfort it is necessary to utilize

Individual Room Temperature Controls of your heating system


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Individual Room Temperature Controls

Precise regulation of the temperature corresponding to

the specific set-point chosen for each room by the user

Individual Room Temperature Controls adjust heat flow

depending on user pattern, free heat through windows,appliances, etc.

Optimal personal thermal comfort

Individual Room Temperature Controls adapt heat output

to heat loss in each room

Minimized costs with regard to energyconsumption/saving


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The Simulation Studies

Danfoss has carried out simulation studies in order to clarify

the importance ofIndividual Room Temperature Control of

the heating system with regard to:

Personal thermal comfort

Energy consumption


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The Simulation System: IDA Indoor Climate and Energy 3.0

IDA Indoor Climate and Energy 3.0 is a general-purpose

modeling and simulation tool for modular systems where

components are described with equations

IDA

Indoor Climate and Energy

3.0 is a new generationtool for simulation of thermal comfort, indoor air quality and

energy consumption in buildings

More than 900 registered users, mostly HVAC designers

but also educators and researchers

First version was released in May 1998. Version 3.0,

released in November2001, marks a major development

step with

several significant improvements


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The Simulation System: IDA Indoor Climate and Energy 3.0

IDA Indoor Climate and Energy 3.0 is developed by the company EQUA in close co-

operation with a network of academic institutions, each contributing through expert

usage and model development:

Royal Institute of Technology , Stockholm, Sweden

Building Services Engineering, Sweden

Helsinki University of Technology, Heating, Ventilating and Air-Conditioning, Finland

Hochschle fr Technik+Architektur, HLK Engineering, Luzern, Switzerland

University of Kassel, Department of Building Physics, Germany

Norweigan University of Science and Technology, Dept. of Refrigeration and Airconditioning,

Norway

For more information please refer to the EQUA homepage http://www.equa.se


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System Control Methods

Automatic control of flow temperature using an

electronic weather compensator

With individual room temperature control

Without individual room temperature control

Manual control of flow temperature by occupant

operation of self-acting flow regulator




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Benefits of Floor Heating ControlAutomatic Control of Flow Temperature Using an Electronic Weather

Compensator

No occupant interaction on the heating system during heating

season

Apartment with 6 rooms

No reference room control

Doors to bathroom and bedroom closed and the other doors open Flow control to each room is on/off with a dead-band of 0.25 C

Minimum operative temperatures registered in the rooms equals

desired temperatures

Flow temperature is adjusted to ensure desired indoor temperatures

at a coldest day of -12C

Thermal comfort related to tube layout is not included in the study Only energy consumption in association with room heating is

considered - efficiency of the energy producing and delivering system

is not considered


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Benefits of Floor Heating ControlManual Control of Flow Temperature by Operation of Self-acting Flow

Regulator

The occupant checks the flow temperature with regular intervals and

change the set-point of the flow temperature regulator if the deviation

between proposed value and present value of the flow temperature is

more than 2C

No occupant interaction on the room thermostats during heating

season

Apartment with 6 rooms

Doors to bathroom and bedroom closed and the other doors open

Flow control to each room is on/off with a dead-band of 0.25 C

Minimum operative temperatures registered in the rooms equals

desired temperature

Flow temperature is adjusted to ensure desired in-door

temperatures at a coldest day of -12 C

Thermal comfort related to tube layout is not included in the study

Only energy consumption in association with room heating is

considered - efficiency of the delivering and energy producing

system is not considered


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Settings For Both Simulations

Heating season: 9 months (September to May)

Set-point temperatures (degrees Celsius)

Living room 20C

Corridor 20C Bedroom 17C

Bathroom 23C

Kitchen 20C

Childrens room 20C

Measured results % of time during heating season, where operative

temperature deviates with less than 1 celcius degree

from set-point temperature


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Benefits of Floor Heating ControlAutomatic Control Of Flow Temperature Using An Electronic Weather

Compensator

0 10 20 30 40 50 60 70 80 90 100

Childrens room

Kitchen

Bathroom

Bedroom

Corridor

Living room



% of time during heating season, whereoperative temperature deviates with less than1 celcius degree from set-point temperature


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Conclusions: Personal Thermal Comfort

Significantly improved personal thermal comfort with individual room temperature

controls

Individual Room Temperature Control is optimal in combination with both electronic

weather compensator and occupant interaction for regulation of flow temperature


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Results on Energy Consumption

Flow temperature control

Pre-setting

of manifold

valves

Without

room

temperature

controls

With

room

temperature

controls

Reduction

in energy

consumptio

n

Automatic using an electronic weather compensator Yes 8372 kWh 7392 kWh 12%

Automatic

using an electronic weather compensator No 9 550 kWh 7390 kWh 23%

Manual

occupant operation of self-acting flowregulator

Yes 9009 kWh 7552 kWh 16%

Manual

occupant operation of self-acting flowregulator

No 10412 kWh 7681 kWh 26%


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Conclusions: Energy Consumption

Significant energy savings can be achieved with Individual Room Temperature Controls

15-25%

Significant energy savings can be achieved in combination with both electronic weather

compensator and occupant interaction for regulation of flow temperature

The simulation results support independent research by e.g. M. Bauer, University of

Stuttgart, who shows possible energy savings of approx. 20-40% for similar applications


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Benefits of Floor Heating ControlSimulation Data:

Automatic Control Of Flow Temperature Using An Electronic WeatherCompensator

Heating season: 9

months

(September to May)

Set-point

temperatur

e

(oC)

% of time during heating season, where

operative temperature deviates with less than1oC from set-point temperature

Without room

control

With room control

Living room 20 70% 98%

Corridor 20 9% 100%

Bedroom 17 0% 67%

Bathroom 23 46% 91%

Kitchen 20 2% 99%

Childrens room 20 0% 97%


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Benefits of Floor Heating ControlSimulation Data:

Manual Control of Flow Temperature by Operation of Self-acting FlowRegulator

Heating season: 9

months

(September to May)

Set-point

temperature

(oC)

% of time during heating season, where

operative temperature deviates with less than

1oC from set-point temperature

Without room

control

With room control

Living room 20 30% 96%

Corridor 20 9% 97%

Bedroom 17 0% 56%

Bathroom 23 30% 98%

Kitchen 20 7% 92%

Childrens room 20 2% 88%

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