Temperature-monitoring and control system

• US 4,058,254 A
• Filed: 07/11/1975
• Issued: 11/15/1977
• Est. Priority Date: 01/26/1968
• Status: Expired due to Term

• Current Assignee: Danfoss A/S
• Original Assignee: Danfoss A/S
• Inventors: Hallgreen, Knud Julius
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US05/594,964
• Time in Patent Office: 858 Days
• Field of Search: 236/1 R, 236/68 B, 236/6, 236/36, 219/499, 317/42, 73/362 AR, 338/22 R, 323/75 H, 323/75 N, 361/165
• US Class Current: 236/68.00B
• CPC Class Codes: G05D 23/1934 each space being provided with one sensor acting on one or more control means
• CPC Class Codes: G05D 23/24 the sensing element having a resistance varying with temperature, e.g. a thermistor

Abstract

The invention relates to a system for measuring or controlling the thermal comfort in spaces used by living beings. In operation an output signal is produced which indicates whether or how much the actual thermal conditions in the space differ from comfort conditions and this output signal may be used to control the comfort conditions in the space. The sensing means takes into account the same conditions as does a living being with respect to convection heat, radiation heat and the heat produced by metabolism. The last mentioned heat might be set in accordance to the activity level of the living being. The surface temperature of the sensing means is compared with a comfort temperature set by a second setting means. If the first setting means is set to a higher heat supply, the second setting means is simultaneously set to a lower comfort temperature and vice versa.

Claims

1. A system for controlling the thermal comfort in a space used by living beings comprising sensing means adapted to be influenced by convection heat and to receive and deliver radiant heat, first adjustable setting means for continuously supplying heat energy to said sensing means corresponding to an expected activity level so that its surface temperature is above ambient temperature, first indicator means for indicating the temperature of said sensing means, second adjustable setting means for selecting a desired comfort temperature setting, second indicator means associated with said second adjustable setting means for indicating said desired comfort temperature setting, and means for the common setting of said first and second setting means so that an increase in the heat energy supplied to said sensing means corresponds to a lowering of said desired comfort temperature setting and vice versa;

said first and second indicating means being subject to comparison to control the thermal input to said space.

2. A system according to claim 1 in which said surface of said sensing means has a radiant absorption coefficient which corresponds to that of a living being.

3. A system according to claim 2 in which said sensing means and said first and second indicator means are in a bridge circuit, said sensing means being an NTC-resistance in one branch and said second setting means being a rheostat in a second branch of said bridge circuit.

4. A system according to claim 3 in which said first setting means controls the supply voltage of said bridge circuit.

5. A system according to claim 3 in which said first setting means controls the current through a heater arranged near said sensing means.