CA2211746A1 - Ventilation controller using outside condition parameters and method to control humidity in buildings and basements - Google Patents
Ventilation controller using outside condition parameters and method to control humidity in buildings and basementsInfo
- Publication number
- CA2211746A1 CA2211746A1 CA 2211746 CA2211746A CA2211746A1 CA 2211746 A1 CA2211746 A1 CA 2211746A1 CA 2211746 CA2211746 CA 2211746 CA 2211746 A CA2211746 A CA 2211746A CA 2211746 A1 CA2211746 A1 CA 2211746A1
- Authority
- CA
- Canada
- Prior art keywords
- ventilation
- humidity
- buildings
- basements
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/0008—Control or safety arrangements for air-humidification
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D22/00—Control of humidity
- G05D22/02—Control of humidity characterised by the use of electric means
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ventilation (AREA)
Abstract
Abstract Not Yet Available
Description
Incomplete Application for a Patent Title: Ventilation Controller Using Outside Condition Parameters and Method to Control Humidity in Buildings and Basements Description of the invention:
This invention relates to an environmental controller using outside weather conditions parameters - temperature and relative humidity- in addition to the values inside the house. This invention is also a method to control ventilation devices such as air extractors, air exchangers, heat recovery ventilators and/or dehumidifiers, in order to control moisture condensation, indoor air quality and energy efficiency of buildings with or without basement.
Typically, the controller uses a temperature and a humidity sensor both installed outside the building, and another sensor installed inside the building to measure inside relative humidity.
The program in the controller uses outside temperature and humidity to automatically calculate the set point for relative humidity. This set point is used to start and stop ventilation devices in the building to control inside humidity level. The set point is determined in order to maintain inside air dew point just below the temperature of the coldest parts of the building envelope, maintaining a maximal humidity content and avoiding condensation at the same time, for a better indoor air quality.
In winter, the moisture content of cold outside air is low and ventilation is always able to remove the excess of humidity generated inside the house, especially in the new airtight type of construction. The coldest parts of the building envelope are generally windows on which condensation is not desired. Winter setting is determined in terms of inside relative humidity and depends on outside temperature. To avoid condensation, the inside humidity set point will decrease with colder outside temperature. When outside temperature increases (as well as window surface temperature), the humidity set point will increase up to a maximum level. This will avoid unnecessary high rates of ventilation, generating therefore energy savings for heating while avoiding a too low level of inside air moisture content which may cause health problems for occupants.
In summer, condensation problems and indoor air quality generally occur in basement.
Basement floor and walls below ground level remain cold late in the warm season. As humidity content of warm outside air increases, its ability to remove humidity from the house decreases.
When outside air dew point exceeds basement floor and wall surface temperature, condensation problems increase, causing potential hazard for structural damages and health problems due to mould. Summer setting of the ventilation controller is based on outside air dew point. House basement ventilation is activated when outside air dew point is lower than a value chosen as the temperature of the coldest inside surface of the basement. Above this point, the controller will stop ventilation and can activate an electrical outlet on which users can connect a standard dehumidifier if they own one. This strategy gives priority to basement ventilation rather than to dehumidifier operation, increasing basement air quality and generating energy savings.
TN conseil, Conseillers en technologie de l'environnemenf inc. E-mail: tn.conseil~sympatico 5227, rue Notre-Dame est, bureau 200 Tel: (514) 254-3541 Montréal, Qc, HlN 3K5, Canada Fax: (514) 257-7729 A manual adjustment wili allow to increase or decrease the différence between the controller actual set point and the automatically determined value of dew point to account for the different characteristics of building envelope and basement construction such as type of window and insulation level.
' 4 Existing controllers for residential ventilation are generally based on inside relative humidity only, with a manual set-point adjustment. Compared to existing controllers, this controller offers the following advantages:
~ Automatic indoor humidity set point in winter to maintain the minimal rate of ventilation able to control condensation, avoiding:
~ a manual adjustment normally required with outdoor temperature variation;
~ unnecessary dry air maintained inside the house, which may cause health problems;
~ too high rates of ventilation which increase energy consumption.
~ Control of humidity brought inside the house by outside air during the warm season, especially in basement:
~ Priority to fresh air ventilation ~ Optional operation of dehumidifier only when outside air dew point exceeds basement surface temperature The automatic adjustment of inside humidity set point depending on outside temperature was proposed for humidification control (controllers known as a humidistat~) but not for residential ventilation control (controllers known as a dehumidistat ~).
Robinson in US 4,189,094, filed Feb. 6, 1978, teaches the automatic control of ventilation degree in response to variations in the outside temperature.
Wylie, Calvin, Crites and Patrick in US 5,065,585, filed Oct. 25, 1990, teach the free cooling of the interior of buildings using fresh air when there is a demand for cooling and inside temperature exceeds outdoor air temperature by a predetermined degree.
Stephen in US 4,148,147 filed Oct. 28, 1977 teaches the optimum utilization of energy in the operation of ventilation fans and dehumidihcation for the curing of grain, based on air temperature differential measurements.
Newell in US 4,659,009 filed Apr. 4, 1985, teaches the control of ventilation and heating apparatus in response to excessive relative humidity.
Sarazen and Beam in US 5,253,804 filed May 12, 1992, teach a temperature and humidity controlled fan in housing with a temperature responsive louver arrangement for ventilating building foundation.
Other control strategies for ventilation propose the use of pollutant detectors such as carbon dioxide in US 5,215,498 filed June 6, 1991 taught by Wong and McGibbon.
TN conseil, Conseillers en fechnologie de l'environnement inc. E-mail:tn.c~n~ ympatico 5227, rue Notre-Dame est, bureau 200 Tel: (514) 254-3541 Montréal, Qc, HlN 3K5, Canada ~ Fax: (514) 257-7729
This invention relates to an environmental controller using outside weather conditions parameters - temperature and relative humidity- in addition to the values inside the house. This invention is also a method to control ventilation devices such as air extractors, air exchangers, heat recovery ventilators and/or dehumidifiers, in order to control moisture condensation, indoor air quality and energy efficiency of buildings with or without basement.
Typically, the controller uses a temperature and a humidity sensor both installed outside the building, and another sensor installed inside the building to measure inside relative humidity.
The program in the controller uses outside temperature and humidity to automatically calculate the set point for relative humidity. This set point is used to start and stop ventilation devices in the building to control inside humidity level. The set point is determined in order to maintain inside air dew point just below the temperature of the coldest parts of the building envelope, maintaining a maximal humidity content and avoiding condensation at the same time, for a better indoor air quality.
In winter, the moisture content of cold outside air is low and ventilation is always able to remove the excess of humidity generated inside the house, especially in the new airtight type of construction. The coldest parts of the building envelope are generally windows on which condensation is not desired. Winter setting is determined in terms of inside relative humidity and depends on outside temperature. To avoid condensation, the inside humidity set point will decrease with colder outside temperature. When outside temperature increases (as well as window surface temperature), the humidity set point will increase up to a maximum level. This will avoid unnecessary high rates of ventilation, generating therefore energy savings for heating while avoiding a too low level of inside air moisture content which may cause health problems for occupants.
In summer, condensation problems and indoor air quality generally occur in basement.
Basement floor and walls below ground level remain cold late in the warm season. As humidity content of warm outside air increases, its ability to remove humidity from the house decreases.
When outside air dew point exceeds basement floor and wall surface temperature, condensation problems increase, causing potential hazard for structural damages and health problems due to mould. Summer setting of the ventilation controller is based on outside air dew point. House basement ventilation is activated when outside air dew point is lower than a value chosen as the temperature of the coldest inside surface of the basement. Above this point, the controller will stop ventilation and can activate an electrical outlet on which users can connect a standard dehumidifier if they own one. This strategy gives priority to basement ventilation rather than to dehumidifier operation, increasing basement air quality and generating energy savings.
TN conseil, Conseillers en technologie de l'environnemenf inc. E-mail: tn.conseil~sympatico 5227, rue Notre-Dame est, bureau 200 Tel: (514) 254-3541 Montréal, Qc, HlN 3K5, Canada Fax: (514) 257-7729 A manual adjustment wili allow to increase or decrease the différence between the controller actual set point and the automatically determined value of dew point to account for the different characteristics of building envelope and basement construction such as type of window and insulation level.
' 4 Existing controllers for residential ventilation are generally based on inside relative humidity only, with a manual set-point adjustment. Compared to existing controllers, this controller offers the following advantages:
~ Automatic indoor humidity set point in winter to maintain the minimal rate of ventilation able to control condensation, avoiding:
~ a manual adjustment normally required with outdoor temperature variation;
~ unnecessary dry air maintained inside the house, which may cause health problems;
~ too high rates of ventilation which increase energy consumption.
~ Control of humidity brought inside the house by outside air during the warm season, especially in basement:
~ Priority to fresh air ventilation ~ Optional operation of dehumidifier only when outside air dew point exceeds basement surface temperature The automatic adjustment of inside humidity set point depending on outside temperature was proposed for humidification control (controllers known as a humidistat~) but not for residential ventilation control (controllers known as a dehumidistat ~).
Robinson in US 4,189,094, filed Feb. 6, 1978, teaches the automatic control of ventilation degree in response to variations in the outside temperature.
Wylie, Calvin, Crites and Patrick in US 5,065,585, filed Oct. 25, 1990, teach the free cooling of the interior of buildings using fresh air when there is a demand for cooling and inside temperature exceeds outdoor air temperature by a predetermined degree.
Stephen in US 4,148,147 filed Oct. 28, 1977 teaches the optimum utilization of energy in the operation of ventilation fans and dehumidihcation for the curing of grain, based on air temperature differential measurements.
Newell in US 4,659,009 filed Apr. 4, 1985, teaches the control of ventilation and heating apparatus in response to excessive relative humidity.
Sarazen and Beam in US 5,253,804 filed May 12, 1992, teach a temperature and humidity controlled fan in housing with a temperature responsive louver arrangement for ventilating building foundation.
Other control strategies for ventilation propose the use of pollutant detectors such as carbon dioxide in US 5,215,498 filed June 6, 1991 taught by Wong and McGibbon.
TN conseil, Conseillers en fechnologie de l'environnement inc. E-mail:tn.c~n~ ympatico 5227, rue Notre-Dame est, bureau 200 Tel: (514) 254-3541 Montréal, Qc, HlN 3K5, Canada ~ Fax: (514) 257-7729
Claims
Claims Not Yet Available
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2211746 CA2211746A1 (en) | 1997-08-19 | 1997-08-19 | Ventilation controller using outside condition parameters and method to control humidity in buildings and basements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2211746 CA2211746A1 (en) | 1997-08-19 | 1997-08-19 | Ventilation controller using outside condition parameters and method to control humidity in buildings and basements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2211746A1 true CA2211746A1 (en) | 1999-02-19 |
Family
ID=4161134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2211746 Abandoned CA2211746A1 (en) | 1997-08-19 | 1997-08-19 | Ventilation controller using outside condition parameters and method to control humidity in buildings and basements |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2211746A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1083390A3 (en) * | 1999-09-07 | 2002-12-04 | Sharp Kabushiki Kaisha | Air conditioner having dehumidifying and ventilating functions |
| CN113846875A (en) * | 2021-11-29 | 2021-12-28 | 四川宏华电气有限责任公司 | Condensation-preventing electric control room for field operation, control system and control method |
-
1997
- 1997-08-19 CA CA 2211746 patent/CA2211746A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1083390A3 (en) * | 1999-09-07 | 2002-12-04 | Sharp Kabushiki Kaisha | Air conditioner having dehumidifying and ventilating functions |
| CN113846875A (en) * | 2021-11-29 | 2021-12-28 | 四川宏华电气有限责任公司 | Condensation-preventing electric control room for field operation, control system and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |