FI107647B - Method and apparatus for temperature control - Google Patents

Description

107647

METHOD AND APPARATUS FOR ADJUSTING TEMPERATURE

The present invention relates to a method for controlling the temperature by controlling the flow of a medium as defined in the preamble of claim 1. The invention further relates to a temperature control device as defined in the preamble of claim 6.

It is previously known to use a temperature control method in which a medium, such as air, water or the like, is introduced into a space, e.g. The temperature control device includes a controller which is connected to the actuator and the detector. The controller has a specific setpoint temperature that the control aims to achieve. The indicator is intended to indicate the room temperature.

The problem is the use of known technology for both cooling and heating. When system 20 is used for both heating and cooling, there must be two separate pipe networks, which complicates construction and raises construction costs. Specifically, adding room-specific cooling is: 1 difficult and expensive. Problems also arise from the fact that when the temperature is only measured in the room, • 1 ·. · Eg in a room, the control does not react quickly enough to changes in temperature of 11 and thus the temperature variation in time is significant.

The object of the invention is to eliminate the disadvantages mentioned above.

As to the features of the invention, reference is made to the claims.

In the process of the invention, the space heating; to adjust the temperature, the room temperature is measured, * * · · ·: 1 35 to the room temperature setpoint, and the comparison is to control the flow of media to the room. According to the invention, the temperature of the incoming medium in addition to the room temperature is measured and compared to the room temperature. In addition, the room temperature is compared to the setpoint temperature, whereby the flow is controlled based on the comparison.

5 In one embodiment of the method, the actuator does not limit fluid flow when the room temperature is greater than the incoming medium temperature and the room temperature is greater than the controller temperature setpoint. In this case, no limitation occurs because the setpoint value is to lower the room temperature and the incoming medium temperature is lower than the room temperature, so without limiting the flow, the room temperature decreases. Therefore, it is desired that the device cool the space.

15 In one embodiment of the method, the actuator limits fluid flow when the space temperature is lower than the incoming medium temperature and the space temperature is greater than the controller temperature setpoint. The flow is then restricted because the temperature of the space 20 is already higher than the setpoint temperature of the controller and the temperature of the incoming medium is still higher than the temperature of the space. Therefore, it is desired that the device inhibit heating in the state.

. »In an application of the method, the actuator * * ♦ * * '*. 25 limits the medium flow when the room temperature is * * • * \ higher than the incoming medium temperature and the room temperature * * '· * · »is lower than the controller temperature setpoint. This limits the flow as the incoming medium further decreases the temperature and the room temperature; V 30 is already lower than the controller setpoint.

Therefore, it is desired that the device prevent cooling in the state.

In one embodiment of the method, the actuator does not restrict fluid flow when the room temperature '*. ** 35' is lower than the incoming medium temperature and the room temperature · · is smaller than the controller temperature set ··· ♦. This does not limit the flow of the medium, 107647 because the incoming medium raises the room temperature and the room temperature is lower than the controller temperature setpoint. Therefore, it is desired that the device warms the space.

The control device of the invention includes a controller having a setpoint setpoint for the room temperature, an actuator arranged to control the flow of the medium, and a first detector indicating the setpoint temperature. According to the invention, the control device 10 includes a second detector which measures the temperature of the incoming medium and a comparator which compares the temperature of the incoming medium and the space.

In one embodiment of the device, the control device includes a state machine, e.g., a relay or power fete, the first of which 15 is connected to the comparator, the state machine and the second state machine, the second state machine is further connected to the controller. The state machines have two possible states, open or closed. When two state machines are combined in a manner according to the invention, the state-20 combination gives four different states.

In one embodiment of the device, the control device includes one or more detectors, which may be:. · · A temperature sensor. Detectors may be required for::: several, since the differences in the temperature of the space at different locations may be significant, and thus, for example, averaging the temperatures provided by the various detectors may be obtained. . ·. lan the average temperature at which butter- '. !! better control of the room temperature.

In one embodiment of the device, the control device 30 is electrically operated, wherein the device is arranged from electrical components. For example, the actuator is a servomotor * valve.

: 1.: Thanks to the invention, room-by-room heating or cooling can be easily and inexpensively achieved since the system does not require two separate pipe networks. Since temperature measurement is now performed at two different locations, namely the state and the incoming medium, the temperature variation with respect to control is significantly reduced over time.

The invention will now be described in more detail by way of example with reference to the accompanying drawings, in which Figure 1 shows a temperature control device according to the invention; and Fig. 2 shows a table of functions of the adjusting device of Fig. 1.

Figure 1 shows the positioning of the various components of the control device relative to one another. The control device includes a controller 1 which is connected to the state machine, the relay 7 and the relay 7 is further connected to the state machine, the relay 6. The control part 9 of the relay 6 is connected to the output of the comparator 5. The temperature sensor 3 and the temperature sensor 4 are connected to the inputs of the comparator 5. The relay 6 is connected to the control part 10 of the actuator 2. The actuator 2 is located between the incoming water and the heat exchanger 8.

20 Figure 2 shows a function table. The changeover relay is relay 6 and the control relay is relay 7. The first column of the function table contains the temperature conditions::: which are formed by the method according to the invention.

• · · · -1: The second and third columns have switchover and weather • · · ·: 25 possible modes of operation, ie 1 on and 0 in the last column. 0.

A. The following illustrates the operation of the actuator * '' by way of example with reference to the accompanying Figures 1 and 2.

30 The temperature control device operates such that the temperature sensors 3, 4 measure the temperature of the room and the incoming water, on the basis of which comparator 5 controls the relay: 6 and controller 1 controls the relay 7. The controller includes a temperature sensor; 35 to the setpoint temperature of controller 1. Based on the settings of relays 6, ♦ · · ♦ 7 the actuator 2 is controlled. If '**' room temperature TE1 is higher than incoming water 1 • · · · 5 is in state 0 and relay 7 is in state 0, then the flow is in state 1, i.e. the flow is not restricted. When temperatures TE1 5 and TE2 fluctuate very close, the actuator does not react, i.e. actuator actuator 2 does not change state. For example, cooling will only turn on when the temperature difference is more than 1 degree Celsius. This range of hysteresis may be adjustable.

The invention is not limited only to the above exemplary embodiment, but many modifications are possible within the scope of the inventive idea defined by the claims.

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Claims (10)

1. A method for controlling the temperature of a space, such as a room or equivalent, by controlling the flow of a medium, in which process the medium is fed to the space, the temperature (TE1) of the space is fed and the flow of the medium is controlled on the basis of the temperature (TE1) and the temperature setpoint (TA) by means of a functional device (2), characterized in that the temperature (TE2) entering the space is fed, the temperature (TE2) is compared with the temperature (TE1). ) and the temperature (TE1) are compared with the temperature (TA) and the flow of the medium is controlled because of the comparison. 2. A method according to claim 1, characterized in that the flow of the medium is allowed, since the temperature of the space (TE1) is greater than the incoming medium's temperature (TE2) and the temperature of the space (TE1) is greater than the set value (TA ) temperature. 3. A method according to claim 1, characterized in that the flow of the medium to the space is prevented, since the temperature (TE1) of the space is. less than the temperature of the incoming medium (TE2) and • · «·: the room temperature (TE1) is greater than the set value * * * *. . ·. (TA) temperature. • · · 25 Method according to claim 1, characterized in - *** | characterized in that the flow of the medium to the outside space is prevented, since the temperature of the space (TE1) is • · · * · '* greater than the incoming medium's temperature (TE2) and the room's temperature (TE1). less than the setpoint (TA) temperature. Method according to claim 1, characterized in -. characterized in that the flow of the medium to the outflow is allowed, where the room temperature (TE1) is less than the incoming medium temperature (TE2) and out ::: The room temperature (TE1) is less than the set temperature (TA) temperature. • ♦ 9 107647 6. Temperature control means to which: - a control device (1), in which the setpoint (TA) of the space is adjacent to It and which is arranged to compare the temperature (TE1) of the space with the setpoint (TA); - a functional device (2) which is connected to the control device and which is arranged to control the flow of the medium; and 10. a first detector (3) which indicates the temperature (TE1) of the space and which is connected to the control device, characterized in that a second detector (4) indicating the temperature of the incoming medium (TE2) is associated with the control means. and a comparison device (5), which is associated with the control device (1) for comparing the temperatures (TE1) and (TE2) and providing a control signal. 7. Control means according to claim 6, characterized in that the control means includes a first state machine (6), which is associated with the comparison device (5) and the functional device. (2), and a second state machine (7), which is associated with the first state machine (6) and the control device (1); and that the state machine (6, 7) has two different positions. • · · ··· '8. Control means according to claim 6, characterized in that the detector (3, 4) is a • · ·: heat sensor. Control means according to claim 6, characterized in that to the control device (1). ***. hear a detector indicating the room temperature 7 \ (TED · ♦ · · ··! · 10. Control means according to claim 6, characterized in that the control means comprises a plurality of detectors. A · a · a · a