NL2001904C - Thermostat and method for controlling a hvac system, and a method for providing feedback to a user of a hvac system. - Google Patents
Thermostat and method for controlling a hvac system, and a method for providing feedback to a user of a hvac system. Download PDFInfo
- Publication number
- NL2001904C NL2001904C NL2001904A NL2001904A NL2001904C NL 2001904 C NL2001904 C NL 2001904C NL 2001904 A NL2001904 A NL 2001904A NL 2001904 A NL2001904 A NL 2001904A NL 2001904 C NL2001904 C NL 2001904C
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- NL
- Netherlands
- Prior art keywords
- thermostat
- hvac system
- power output
- temperature value
- visual indicator
- Prior art date
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1917—Control of temperature characterised by the use of electric means using digital means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Air Conditioning Control Device (AREA)
Description
P29516NLOO/RPO
Thermostat and method for controlling a HVAC system, and a method for providing feedback to a user of a HVAC system
FIELD OF THE INVENTION
5 The invention relates to the field of HVAC systems, and more specifically to a thermostat for controlling a HVAC system. Further the invention relates to a method of controlling a HVAC system and to a method of providing a user with feedback concerning the operational status of a HVAC system.
10 BACKGROUND OF THE INVENTION
Occupants of dwellings and commercial structures have long benefited from the inclusion of a heating, ventilating, and air conditioning or HVAC system that regulates the temperature and humidity within the dwelling or structure. Traditionally, the thermostat that 15 controlled this temperature regulating equipment was a fairly simple electromechanical device that was simply wired to a heating device and/or to a cooling device. Once installed, the user need only move a selector switch between heating and cooling to designate which equipment was desired to be operated, move a selector switch between run and auto for a fan control, and rotate a dial to a desired set point temperature. No other user interface to the thermostat 20 was needed or available, and no indication of system operation was provided.
To provide such indication of the operational status of the HVAC system, such digital thermostats now often include light emitting diode (LED) type indicators that illuminate when the heating and/or cooling equipment in the home is active. This provides an immediate visual 25 indication of the operational status of the heating and/or cooling equipment. This is for example shown in European patent application EP 1 879 090 A2.
An alternative solution is disclosed in International patent application WO 2007/027645, which discloses a thermostat for a HVAC system having a display system that 30 provides heating and cooling system operating information to the user. The display system provides animated icons on the user display of the digital thermostat. WO 2007/027645 further discloses that a bitmap image on the user display of the digital thermostat is overwritten with another bitmap image at a given frequency indicating operation of the heating -2- and/or cooling equipment. WO 2007/027645 further discloses that the frequency of overwriting is varied to provide a visual perception of various speeds of the fan.
When a HVAC system is used it has been found or at least generally accepted that 5 the ideal temperature setting should be between 18°C and 20°C. Any temperature above 20°C in the winter season or below 18°C in the summer season will result in a too large energy consumption. While most people fully appreciate the need to conserve energy and are willing to cooperate in such endeavour, achieving such goal is not always possible, largely due to human error or negligence. For example, energy is wasted when the consumer forgets 10 to turn the HVAC off when there is no one in the house. Energy is also wasted when the consumer neglects to adjust the setting during night time, or is used to inappropriate (too high and/or too low) temperature settings. Neither EP 1 879 090 nor WO 2007/027645 is able to convey such information to a user of the HVAC system.
15 In the European patent application EP 1 703 356 A1 it is proposed to provide a thermostat with a LED that can emit light of different colours dependent on either a set temperature or a measured room temperature. EP 1 7030 356 A1 discloses that one of said temperatures is relatively high, the colour of the light emitted is in the red range. When one of said temperatures is relatively low, the colour of the light emitted is in the blue range. This 20 provides the user with information on whether or not his temperature settings are within a normal range.
Although EP 1 703 356 A1 makes a user aware of possible deviant temperature settings, the user may accept such settings and has no feedback on the power output of the 25 HVAC system. Hence, EP 1 703 356 A1 does not make a user fully aware of the energy consumption of the HVAC system.
SUMMARY OF THE INVENTION
30 It would therefore be desirable to provide a thermostat which can provide the user with feedback on the power output of the HVAC system. It would further be desirable to provide at least a good alternative to the known thermostats.
To better address one or more of these concerns, in a first aspect of the invention a 35 thermostat for controlling a HVAC system is provided, the thermostat comprising a visual indicator for displaying operational information of the HVAC system, the visual indicator being -3- arranged to display said information with a display frequency. The thermostat is arranged to adjust the display frequency on the basis of the level of power output of the HVAC system. By coupling the power or energy consumption of the HVAC system to the frequency at which the visual indicator displays the operational information thereof, the user will be directly informed 5 on the level of the power output.
In an embodiment the power output of the HVAC system is determined on the basis of a temperature difference between a desired temperature value and an ambient temperature value.
10
In an embodiment the display frequency decreases with a decreasing level of power output and vice versa. This provides the user with feedback that may be considered analogous to a heartbeat, i.e. the harder the HVAC system is working the higher the frequency of the displayed information. This provides the user in a very intuitive manner with 15 information concerning the operational status of the HVAC system.
In an embodiment the visual indicator comprises a light source, in particular comprises a LED. This provides clearly visible way of providing information.
20 In an embodiment the light source is controlled to emit light in a pulsating manner, wherein the light source emits light between a maximum level and a minimum level. In this manner the effect of a heart beat of the system is further emphasized.
In an embodiment the light source is arranged to emit light of different colours, 25 wherein the thermostat is further arranged to control the colour of the emitted light dependent on a temperature value. In this manner it is also possible to provide the user of the HVAC system with feedback on the actual temperature settings he is using. By using colours as an indication of the temperature value there is no need to interpret the information, for example when a numerical representation is used.
30
In an embodiment the temperature value is a setpoint temperature value, so that the user gets direct feedback on his settings.
In an embodiment the temperature value is a measured ambient temperature value, 35 so that the user gets direct feedback on the level of the temperature in his surroundings.
-4-
In an embodiment the visual indicator comprises a further light source that is arranged to emit light of different colours and wherein the thermostat is further arranged to control the colour of the emitted light of the further light source dependent on a measured ambient temperature value. In this manner the feedback is divided over at least two light sources, 5 which enhances the usability of the thermostat.
In an embodiment the visual indicator is further arranged to alphanumerically and/or graphically display one of the actual power output and efficiency of the HVAC system, so as to further increase the awareness of a user.
10
According to a second aspect of the invention a method of controlling a HVAC system is provided, the method comprising, determining a value of the power output of the HVAC system, and controlling a visual indicator, which visual indicator is arranged to display 15 operational information of the HVAC system with a display frequency, based on the determined value of the power output of the HVAC system.
According to a third aspect of the invention a method of providing feedback to a user on the operational status of a HVAC system being controlled by a thermostat is provided, the 20 thermostat comprising a visual indicator arranged to display operational information of the HVAC system, the method comprising determining a value of a power output of the HVAC system, and controlling a display frequency of the visual indicator on the basis of the determined value of the power output of the HVAC system.
25 These and other aspects of the invention will be more readily appreciated as the same becomes better understood by reference to the following detailed description and considered in connection with the accompanying drawing in which like reference symbols designate like parts.
30 BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 depicts a thermostat according to the invention.
DETAILED DESCRIPTION OF EMBODIMENTS 35
Figure 1 depicts a plan view of a thermostat 10 according to an example of the invention. Figure 1 depicts the thermostat 10 as it would be seen by a user. The thermostat -δ- ΙΟ is configured to control a HVAC system, and in the example of Figure 1 the thermostat 10 is used to control a boiler of a central heating system. It is to be understood that the invention is not limited to the example shown, but is applicable to HVAC systems in general.
5 The thermostat 10 comprises a user input element 20. With the user input element 20 a user can manually change the set temperature, switch the heating system on or off and can select a so-called switch point mode of the thermostat 10 in which a pre-programmed switching cycle is activated. In the example of Figure 1, the user input element 20 is a rotatable knob 30 which can be turned about its central axis, as is indicated by double arrow 10 A. By turning the rotatable knob 30 fully counterclockwise, the heating system will be turned off, as is indicated with the word “off”. Turning the knob 30 clockwise again the heating system will be turned on and a temperature setting or desired temperature value can be set, as is indicated with the word “manual”. By turning the knob 30 fully clockwise, the thermostat 10 is put into its switch point mode and a pre-programmed cycle (if available) will be executed 15 by the thermostat, as is indicated with the word “program”. In order to be able to execute the switch point mode the thermostat 10 is preferably provided with a electronic memory and a processor. The thermostat 10 may in such a case be provided with a first communicating device 40, which allows the thermostat 10 to communicate with a programming device such as a personal computer (not shown), either wireless such as via Bluetooth, Wi-Fi or radio, or 20 wired. The first communication device 40 may also comprise a socket for receiving an external memory, such as an USB memory stick or any other suitable memory card.
The thermostat 10 further comprises a second communication device 50 that is arranged for a two-way communication with the heating system. The second communication 25 device 50 may also be incorporated with the first communication device 40. Further the second communication device 50 may communicate with the boiler using in a wired or wireless way. As any usual thermostat, the thermostat 10 controls the heating system on the basis of a difference between a set or desired temperature value and an ambient temperature of the space in which the thermostat 10 is located. To this effect the thermostat 10 is provided 30 with an ambient temperature sensor 60. The temperature measured by the ambient temperature sensor 60 and the desired temperature set by the user are provided as temperature data to the processor of the thermostat 10 which controls the heating system on the basis thereof, in other words, the thermostat 10 can determine the required power output the heating system must deliver to attain the desired temperature.
35
Normally, thermostats are provided with an alphanumerical display which indicates the set temperature and the ambient temperature. The thermostat according to the invention -6- proposes a different approach, in particular in view of a general goal of achieving greater awareness with users on how to conserve energy. The thermostat 10 is provided with a first visual indicator 70 which comprises a multi-coloured light source, in particular a multicoloured LED or an array of a plurality of LED’s, which can emit light over at least a 5 substantial part of the visible spectrum. This means in practice that the first visual indicator 70 can emit light in the range of at least dark blue to purple. The actual colour of the emitted light is determined by the ambient or actual temperature and will indicate whether the actual temperature is above or below a temperature which is generally accepted as comfortable.
The warmer it gets above this preferred temperature, the more the visual indicator 70 or LED 10 will emit light in the red range. In the opposition situation, the cooler it is below the preferred temperature, the more the visual indicator 70 or LED will emit light in the blue range. In case the temperature is substantially corresponding to said preferred temperature, the LED will emit light that is greenish in colour indicating that the ambient temperature corresponds to the preferred temperature.
15
The same principle can be used for indicating the temperature set by the user by means of the knob 30, either by setting the desired temperature manually or using the switch point mode of the thermostat 10. The processor compares the desired temperature with the temperature which is generally accepted as comfortable and controls a second visual 20 indicator 80, which also comprises a light source, in particular a LED or an array of a plurality of LED’s, that can emit light of different colours. Similarly as described above, the thermostat or its processor compares the set temperature with the preferred temperature and controls the colour of the light emitted by the second visual indicator 80 on the basis thereof. In case the desired or set temperature is higher than preferred the emitted light will be in the red 25 range of the visible spectrum. On the other hand when the set temperature is lower than the preferred temperature, the emitted light will be in the blue range of the visible spectrum. In case the desired temperature substantially corresponds to the preferred temperature, the emitted light will be in the green range of the visible spectrum. By providing direct feedback to the user on how his settings compare to the generally accepted or preferred temperature 30 settings, the user’s awareness can be increased.
In the example of Figure 1, the second visual indicator 80 is shaped as a semi-circle that surrounds the knob 30. However, it is also possible to provide a single light source capable of displaying light of different colours or even to integrate the first 70 and second 80 35 visual indicators, whereby the single visual indicator indicates the desired temperature when the knob 30 is used and indicates the ambient temperature in all other situations.
-7-
The strength of the emitted light may also be positively proportional to the ambient lighting, such that the colour remains visible in both bright and dark ambient lighting situation. To this effect the thermostat 10 is further provided with an ambient light sensor 90.
5 Although the use of coloured light as a means of providing feedback to a user on the status of the heating system already increases the awareness of the users, the inventors have realized that the feedback given can be further improved by providing feedback to the user on the power output level of the heating system, which in turn is indicative or determined by the temperature difference between the desired temperature and the ambient temperature. 10 The larger this difference, the higher the power output of the heating system will be. The inventors have realized that in analogy with a heart beat of a person doing physical labour, i.e. the harder said person is working the higher his heart rate will be, feedback in a visible form having a display frequency that is indicative of the level of power output is an intuitive and informative way of providing information on how hard the heating system is working.
15 Hence, the thermostat 10 is arranged to control the display frequency on the basis of the level of power output of the heating or HVAC system. More in particular, the display frequency should preferably decreases with a decreasing level of power output and vice versa. A very suitable way of providing this feedback is to control the first or second visual indicators 70, 80 in this manner such that light is emitted in a pulsating manner between a maximum lighting 20 level and a minimum lighting level, whereby the frequency is dependent on the power output of the heating system. This provides a visible animation of the feedback that strongly resembles a heart beat. Instead of controlling the visual indicators 70, 80 it is also possible to provide a separate visual indicator. It is even conceivable that the visual indicator that displays the information concerning the power output level of the heating system is physically 25 separate from the thermostat.
In addition to what has been described above, the awareness of a user can be further increased by presenting the user with additional feedback, either in alphanumerical and/or in graphical form on the actual power output and/or the efficiency of the HVAC system. This can 30 for example be achieved by providing a LCD screen as visual indicator, which screen displays said information. It is noted that this kind of feedback can also be used independently. Such a thermostat would comprise a visual indicator arranged to display operational information of a HVAC system, wherein the visual indicator is arranged to alphanumerically and/or graphically display one of the actual power output and efficiency of the HVAC system.
35
The thermostat in accordance with the present invention allows the user to conveniently obtain status, usage and ambience information much more effortlessly than -8- conventional thermostats and increases his (or hers) awareness on the energy consumption of the heating system.
As required, detailed embodiments of the present invention are disclosed herein; 5 however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure. Further, the 10 terms and phrases used herein are not intended to be limiting, but rather, to provide an understandable description of the invention. In particular, the invention is not limited to a heating system as exemplified above, but can be used for any HVAC system.
It is for example also possible to use an LCD screen as a visual indicator where the 15 LCD screen displays an animated icon with a display frequency that is indicative of the power output of the HVAC system.
Although the present invention is described in the example of a heating system in particular and a HVAC system in general, it is noted that the principle underlying the present 20 invention can also be used in other fields where temperature control is used. Examples are the use of ovens or microwaves, thermostatic faucets for hot water supply, sauna’s etc.
The terms "a" or "an", as used herein, are defined as one or more than one. The term plurality, as used herein, is defined as two or more than two. The term another, as used 25 herein, is defined as at least a second or more. The terms including and/or having, as used herein, are defined as comprising (i.e., open language, not excluding other elements or steps). Any reference signs in the claims should not be construed as limiting the scope of the claims or the invention.
30 The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
A single processor or other unit may fulfil the functions of several items recited in the claims.
Claims (15)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2001904A NL2001904C (en) | 2008-08-21 | 2008-08-21 | Thermostat and method for controlling a hvac system, and a method for providing feedback to a user of a hvac system. |
| EP09168349A EP2157492A3 (en) | 2008-08-21 | 2009-08-21 | Thermostat and method for controlling a heating, ventilation and air conditioning assembly and for supplying a message on the operation status of such an assembly to a user |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2001904 | 2008-08-21 | ||
| NL2001904A NL2001904C (en) | 2008-08-21 | 2008-08-21 | Thermostat and method for controlling a hvac system, and a method for providing feedback to a user of a hvac system. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL2001904C true NL2001904C (en) | 2010-03-10 |
Family
ID=41466800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL2001904A NL2001904C (en) | 2008-08-21 | 2008-08-21 | Thermostat and method for controlling a hvac system, and a method for providing feedback to a user of a hvac system. |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2157492A3 (en) |
| NL (1) | NL2001904C (en) |
Families Citing this family (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8727611B2 (en) | 2010-11-19 | 2014-05-20 | Nest Labs, Inc. | System and method for integrating sensors in thermostats |
| US8918219B2 (en) | 2010-11-19 | 2014-12-23 | Google Inc. | User friendly interface for control unit |
| US8843239B2 (en) | 2010-11-19 | 2014-09-23 | Nest Labs, Inc. | Methods, systems, and related architectures for managing network connected thermostats |
| US9104211B2 (en) | 2010-11-19 | 2015-08-11 | Google Inc. | Temperature controller with model-based time to target calculation and display |
| US8195313B1 (en) | 2010-11-19 | 2012-06-05 | Nest Labs, Inc. | Thermostat user interface |
| US9459018B2 (en) | 2010-11-19 | 2016-10-04 | Google Inc. | Systems and methods for energy-efficient control of an energy-consuming system |
| US10241527B2 (en) | 2010-11-19 | 2019-03-26 | Google Llc | Thermostat graphical user interface |
| US9552002B2 (en) | 2010-11-19 | 2017-01-24 | Google Inc. | Graphical user interface for setpoint creation and modification |
| US11334034B2 (en) | 2010-11-19 | 2022-05-17 | Google Llc | Energy efficiency promoting schedule learning algorithms for intelligent thermostat |
| US9075419B2 (en) | 2010-11-19 | 2015-07-07 | Google Inc. | Systems and methods for a graphical user interface of a controller for an energy-consuming system having spatially related discrete display elements |
| US10346275B2 (en) | 2010-11-19 | 2019-07-09 | Google Llc | Attributing causation for energy usage and setpoint changes with a network-connected thermostat |
| US9092039B2 (en) | 2010-11-19 | 2015-07-28 | Google Inc. | HVAC controller with user-friendly installation features with wire insertion detection |
| US8850348B2 (en) | 2010-12-31 | 2014-09-30 | Google Inc. | Dynamic device-associated feedback indicative of responsible device usage |
| US9256230B2 (en) | 2010-11-19 | 2016-02-09 | Google Inc. | HVAC schedule establishment in an intelligent, network-connected thermostat |
| US9453655B2 (en) | 2011-10-07 | 2016-09-27 | Google Inc. | Methods and graphical user interfaces for reporting performance information for an HVAC system controlled by a self-programming network-connected thermostat |
| US9222693B2 (en) | 2013-04-26 | 2015-12-29 | Google Inc. | Touchscreen device user interface for remote control of a thermostat |
| US8893032B2 (en) | 2012-03-29 | 2014-11-18 | Google Inc. | User interfaces for HVAC schedule display and modification on smartphone or other space-limited touchscreen device |
| JP2014534405A (en) | 2011-10-21 | 2014-12-18 | ネスト・ラブズ・インコーポレイテッド | User-friendly, networked learning thermostat and related systems and methods |
| EP2769279B1 (en) | 2011-10-21 | 2018-12-26 | Google LLC | Energy efficiency promoting schedule learning algorithms for intelligent thermostat |
| CN104335129B (en) | 2012-03-29 | 2016-09-14 | 谷歌公司 | A kind of method generating energy use report for the HVAC system for being controlled by programmable thermostats |
| US10054964B2 (en) | 2012-05-07 | 2018-08-21 | Google Llc | Building control unit method and controls |
| US8708242B2 (en) | 2012-09-21 | 2014-04-29 | Nest Labs, Inc. | Thermostat system with software-repurposable wiring terminals adaptable for HVAC systems of different ranges of complexity |
| US9046414B2 (en) | 2012-09-21 | 2015-06-02 | Google Inc. | Selectable lens button for a hazard detector and method therefor |
| US9520252B2 (en) | 2012-09-21 | 2016-12-13 | Google Inc. | Adaptable hazard detector mounting plate |
| ES2621566T3 (en) * | 2014-01-20 | 2017-07-04 | Irsap Spa | Method to provide a visual indication of the room temperature set on an electronic thermostat and a corresponding electronic thermostat |
| US9702582B2 (en) | 2015-10-12 | 2017-07-11 | Ikorongo Technology, LLC | Connected thermostat for controlling a climate system based on a desired usage profile in comparison to other connected thermostats controlling other climate systems |
| DK3217245T3 (en) | 2016-03-11 | 2022-05-09 | Danfoss As | THERMOSTAT FACILITY |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU6882581A (en) * | 1980-04-03 | 1981-10-08 | Appliance Control Systems Pty. Ltd. | Heater temperature control |
| US6164374A (en) * | 1998-07-02 | 2000-12-26 | Emerson Electric Co. | Thermostat having a multiple color signal capability with single indicator opening |
| US6726112B1 (en) * | 2003-03-07 | 2004-04-27 | Joseph Ho | Illuminating thermostat |
| EP1703356A1 (en) * | 2005-03-14 | 2006-09-20 | emz-Hanauer GmbH & Co. KGaA | Thermostat comprising a color display |
| US20070045442A1 (en) * | 2005-08-31 | 2007-03-01 | Ranco Incorporated Of Delaware | Thermostat display system providing backlight warning |
| WO2007027645A2 (en) * | 2005-08-31 | 2007-03-08 | Ranco Incorporated Of Delaware | Thermostat display system providing animated icons |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7913925B2 (en) * | 2004-07-23 | 2011-03-29 | Ranco Incorporated Of Delaware | Color changing thermostatic controller |
| US7667163B2 (en) | 2006-07-10 | 2010-02-23 | Ranco Incorporated Of Delaware | Thermostat with adjustable color for aesthetics and readability |
-
2008
- 2008-08-21 NL NL2001904A patent/NL2001904C/en not_active IP Right Cessation
-
2009
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU6882581A (en) * | 1980-04-03 | 1981-10-08 | Appliance Control Systems Pty. Ltd. | Heater temperature control |
| US6164374A (en) * | 1998-07-02 | 2000-12-26 | Emerson Electric Co. | Thermostat having a multiple color signal capability with single indicator opening |
| US6726112B1 (en) * | 2003-03-07 | 2004-04-27 | Joseph Ho | Illuminating thermostat |
| EP1703356A1 (en) * | 2005-03-14 | 2006-09-20 | emz-Hanauer GmbH & Co. KGaA | Thermostat comprising a color display |
| US20070045442A1 (en) * | 2005-08-31 | 2007-03-01 | Ranco Incorporated Of Delaware | Thermostat display system providing backlight warning |
| WO2007027645A2 (en) * | 2005-08-31 | 2007-03-08 | Ranco Incorporated Of Delaware | Thermostat display system providing animated icons |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2157492A2 (en) | 2010-02-24 |
| EP2157492A3 (en) | 2013-02-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM | Lapsed because of non-payment of the annual fee |
Effective date: 20170901 |