Controlling under surface heating/cooling

• US 10,488,057 B2
• Filed: 11/12/2008
• Issued: 11/26/2019
• Est. Priority Date: 11/15/2007
• Status: Active Grant

• Current Assignee: Uponor Innovation AB (Uponor Oyj)
• Original Assignee: Uponor Innovation AB (Uponor Oyj)
• Inventors: Jonsson, Ulf
• Primary Examiner(s): Huson, Gregory L
• Assistant Examiner(s): Namay, Daniel E
• Application Number:
  US12/742,189
• Publication Number:
  US 20110006125A1
• Time in Patent Office: 4,031 Days
• Field of Search: 126 69, 237 69, 237 12, 237 8 A, 237 2 A, 237 59, 237 62, 237 8 R, 237 81, 165 49, 165 56, 165267-269, 165201, 236 1 B, 236 36, 236 91 R
• CPC Class Codes: F24D 19/1009 for central heating
• CPC Class Codes: F24D 3/12 Tube and panel arrangements for ceiling, wall, or underfloor heating electric underfloor heating F24D13/02
• CPC Class Codes: G05D 23/1934 each space being provided with one sensor acting on one or more control means
• CPC Class Codes: Y02B 30/00 Energy efficient heating, ventilation or air conditioning [HVAC]
• CPC Class Codes: Y02B 30/70 Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

Controlling under surface heating/cooling by supplying liquid to at least two supply loops in an under surface heating/cooling system, and controlling the flow of the liquid on and off such that during the duty cycle the flow is high and between the duty cycles the flow is off. Room temperature is controlled by controlling the percentage of the duty cycles, which percentage is determined on the basis of the heating demand of the rooms. Different loops are controlled such that at least in two different loops the duty cycles start at different moments.

Claims

1. A method of controlling under surface heating/cooling, the method comprising

supplying liquid to at least two supply loops in an under surface heating/cooling system, and

controlling the flow of the liquid on and off such that during a duty cycle the flow is high and between the duty cycles the flow is off

whereby

room temperature is controlled by controlling a ratio of the duty cycle to a control time frame, the ratio being determined on the basis of the heating demand of the rooms, and each of the at least two supply loops is controlled such that a maximum ratio of the duty cycle to the control time frame is limited to 70%.

2. A method according to claim 1, wherein

at least in two different loops the duty cycles are performed at different times.

3. A method according to claim 2, wherein

at least in two different loops having essentially the same length the duty cycles are performed simultaneously.

4. A method according to claim 2, wherein

the duty cycle is significantly shorter than the overall time constant of the heating step response of the floor and room.

5. A method according to claim 1, wherein

at least in two different loops having essentially the same length the duty cycles are performed simultaneously.

6. A method according to claim 5, wherein

the duty cycle is significantly shorter than the overall time constant of the heating step response of the floor and room.

7. A method according to claim 1, wherein

the duty cycle is significantly shorter than the overall time constant of the heating step response of the floor and room.

8. The method of claim 1 wherein each of the at least two loops is controlled such that a minimum ratio of the duty cycle to the control time frame is limited to 15%.