JP2919311B2 - Refrigerant heating type heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating apparatus for heating a refrigerant for heating a refrigerant to perform a heating operation.

[0002]

2. Description of the Related Art Conventionally, a compressor, an indoor heat exchanger, a refrigerant heater, and an accumulator are sequentially connected in a ring shape, and refrigerant flowing out of the indoor heat exchanger is sent to the refrigerant heater. 2. Description of the Related Art There is known a refrigerant heating type heating apparatus in which an evaporated refrigerant is sent to a compressor via an accumulator, adiabatically compressed, and a high-temperature and high-pressure refrigerant flowing out of the compressor is condensed in an indoor heat exchanger.

[0003] In this refrigerant heating type heating apparatus, the indoor fan is attached to the indoor heat exchanger, and the indoor fan is rotated to heat exchange the indoor heat exchanger with the indoor air to heat the room. The controller determines the heating power of the refrigerant heater and the number of revolutions of the indoor fan based on the difference between the detected room temperature and the set room temperature.

[0004] In this type of refrigerant heating type heating device, a pressure sensor is disposed downstream of the compressor, and when the refrigerant pressure rises abnormally, a safety device for stopping the heating operation and protecting pipes and the like is usually provided. Is provided.

[0005]

SUMMARY OF THE INVENTION The inventors of the present invention have found that in the above-mentioned conventional refrigerant heating type heating apparatus, when the heating operation is performed when the room temperature is high, the refrigerant pressure becomes too high. Particularly, in the case where the pressure sensor is provided, the heating operation is frequently stopped, and the usability is poor.

The reason why the refrigerant pressure becomes high will be described below. If the difference between the detected room temperature and the set room temperature is constant, the controller operates the refrigerant heater with the same heating power regardless of whether the detected room temperature is high or low. However, as the room temperature increases, the amount of heat released by the indoor heat exchanger decreases, and the enthalpy of the entire refrigerant cycle increases.

An object of the present invention is to provide a refrigerant heating type heating apparatus excellent in safety, in which the refrigerant pressure does not become too high even when the heating operation is performed when the room temperature is relatively high.

[0008]

In order to solve the above-mentioned problems,
The present invention employs the following configuration. (1) A compressor for compressing a refrigerant, an indoor heat exchanger provided with an indoor fan, a refrigerant heater heated by a heating source, and an accumulator are connected in a ring-like manner in order in a circular manner, and the refrigerant flowing out of the indoor heat exchanger is connected. Send to the refrigerant heater, evaporate the refrigerant in the refrigerant heater, adiabatic compression of the gas refrigerant carried out from the refrigerant heater by the compressor via the accumulator, high temperature and high pressure discharged from the compressor When performing a heating operation in which gas refrigerant is condensed in the indoor heat exchanger to release heat into the room, a controller is provided based on a difference between a detected room temperature detected by a room temperature sensor and a set room temperature set by room temperature setting means. Calculates the target heating amount of the heating source and the target rotation speed of the indoor fan, and heats the heating source at the target heating amount and rotates the indoor fan at the target rotation speed. As that, in the refrigerant heating type heating device for controlling the heat source and the indoor fan, and a limit means for detecting room temperature to limit the maximum heating amount of the heating source is higher than a predetermined temperature.

(2) A compressor for compressing the refrigerant, an indoor heat exchanger provided with an indoor fan, a refrigerant heater heated by a heating source, and an accumulator are sequentially connected in a ring-like manner in a line, and The refrigerant flowing out is sent to the refrigerant heater, the refrigerant is evaporated in the refrigerant heater, and the gas refrigerant carried out from the refrigerant heater is adiabatically compressed by the compressor via the accumulator and discharged from the compressor. In performing a heating operation in which a high-temperature and high-pressure gas refrigerant is condensed in the indoor heat exchanger to radiate heat into the room, based on a difference between a detected room temperature detected by a room temperature sensor and a set room temperature set by room temperature setting means. The controller calculates a target heating amount of the heating source and a target rotation speed of the indoor fan, and the heating source is heated at the target heating amount and the room is heated at the target rotation speed. As § down rotates, the refrigerant heating type heating device for controlling the heat source and the indoor fan, detecting room temperature provided a reduction means for reducing the target heating amount is higher than a predetermined temperature.

(3) In the refrigerant heating type heating apparatus having the structure of (1) or (2), a pressure sensor is provided in a pipe downstream of the compressor, and the refrigerant pressure in the pipe is limited to a limit value. When it reaches, the heating operation is stopped.

[0011]

The gas refrigerant discharged from the refrigerant heater is compressed by the compressor, and the temperature and pressure of the refrigerant increase by adiabatic compression. The gas refrigerant changes from the state shown in FIG. 4 along the isentropic line. It displaces and the enthalpy rises slightly (adiabatic compression step). The high-temperature and high-pressure gas refrigerant discharged from the compressor is displaced from the state of FIG. 4 along the isothermal isobar, and condenses in the indoor heat exchanger, and the indoor heat exchanger radiates the heat generated by the condensation into the room. (Refrigerant condensation step).

The refrigerant flowing out of the indoor heat exchanger is displaced from the state of FIG. 4 along the isenthalpy line,
It is sent to the refrigerant heater (refrigerant decompression step). The refrigerant evaporates in the refrigerant heater heated by the heating means, displaces from the state in FIG. 4 along the isothermal isobar, and the enthalpy of the refrigerant increases (refrigerant evaporation step).

When the room temperature is low and the detected room temperature is equal to or lower than the predetermined temperature, the controller sets the target heating of the heating unit based on a difference between the detected room temperature detected by the room temperature sensor and the room temperature set by the room temperature setting unit. The amount and the target rotation speed of the indoor fan are calculated, and the heating source and the indoor fan are controlled such that the heating source is heated at the target heating amount and the indoor fan rotates at the target rotation speed.

If the difference is small, the controller calculates
The target heating amount of the heating means and the target rotation speed of the indoor fan are small, the heating means heats with a small heating amount, and the indoor fan rotates at a low rotation speed (the rotation speed of the compressor is constant). Thereby, both the change width of the enthalpy of the refrigerant in the refrigerant evaporation step and the amount of heat released into the room of the indoor heat exchanger in the refrigerant condensation step are reduced, and the heating capacity is reduced (state → state → state ′ → state ′ → state). ……).

If the difference is large, the controller calculates
The target heating amount of the heating means and the target rotation speed of the indoor fan are large, the heating means heats with a large heating amount, and the indoor fan rotates at a high rotation speed (the rotation speed of the compressor is constant). As a result, the width of change of the enthalpy of the refrigerant in the refrigerant evaporation step and the amount of heat released into the room of the indoor heat exchanger in the refrigerant condensation step both increase, and the heating capacity increases (from state to state to state to state to state ...). ).

According to the present invention, if the difference between the detected room temperature and the set room temperature is constant irrespective of the detected room temperature, the controller controls the heating source with the same heating power regardless of whether the detected room temperature is high or low. For operation, as the room temperature (detection room temperature) increases, the amount of heat released by the indoor heat exchanger decreases, the enthalpy of the entire refrigerant cycle increases, and the refrigerant pressure increases. However, in the present invention, since the limiting means is provided,
When the detected room temperature is higher than the predetermined temperature, the maximum heating amount of the heating source is limited, and an increase in the enthalpy of the entire refrigerant cycle is suppressed. This suppresses a rise in the refrigerant pressure and is excellent in safety.

According to a second aspect of the present invention, if the difference between the detected room temperature and the set room temperature is constant irrespective of the detected room temperature, the controller controls the heating source with the same heating power regardless of whether the detected room temperature is high or low. For operation, as the room temperature (detection room temperature) increases, the amount of heat released by the indoor heat exchanger decreases, the enthalpy of the entire refrigerant cycle increases, and the refrigerant pressure increases. However, in the present invention, since a reducing means is provided,
When the detected room temperature is higher than the predetermined temperature, the target heating amount is reduced, and an increase in the enthalpy of the entire refrigerant cycle is suppressed. This suppresses a rise in the refrigerant pressure and is excellent in safety.

According to the third aspect of the present invention, since the limiting means is provided, when the detected room temperature is higher than the predetermined temperature, the maximum heating amount of the heating source is limited, and the increase in enthalpy of the entire refrigerant cycle is suppressed, and the refrigerant pressure is reduced. Is suppressed. For this reason, even when the set temperature is set high when the room temperature is high, the refrigerant pressure in the pipe downstream of the compressor does not reach the limit value, and the heating operation does not frequently stop, so that the usability is good (claim 1).
Is quoted).

Since the reducing means is provided, when the detected room temperature is higher than the predetermined temperature, the target heating amount is reduced, thereby suppressing an increase in the enthalpy of the entire refrigerant cycle and an increase in the refrigerant pressure. For this reason, even when the set temperature is set high when the room temperature is high, the refrigerant pressure in the pipe downstream of the compressor does not reach the limit value, and the heating operation does not frequently stop, so that the usability is good. Is quoted).

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention (Claim 1,
3) will be described with reference to FIGS. The gas heating / cooling apparatus A of the refrigerant heating type employing the configuration of the present invention,
Each functional member is connected by piping, and as shown in FIG. 1, the compressor 1 → the four-way valve 2 → the indoor heat exchanger 3 → the two-way valve 4 → the refrigerant heater 5 → the accumulator 6 → the compressor 1 The refrigerant is circulated in order to perform a heating operation, and as shown in FIG.
→ Four-way valve 2 → Outdoor heat exchanger 7 → First check valve 8 → Capillary tube 9 → Indoor heat exchanger 3 → Four-way valve 2 → Second check valve 10 → Accumulator 6 → Compressor 1 The cooling operation is performed.

An indoor fan 31 blows air to the indoor heat exchanger 3, an outdoor fan 71 blows air to the outdoor heat exchanger 7,
11 is a check valve. Reference numeral 12 denotes "closed" during the cooling operation, the compressor 1 is stopped during the heating operation and the low pressure 17k.
g / cm ² G or more, a two-way valve which is “open” at 13 g or more, 13 is a gas burner, 14 is a proportional valve, 15 is a pressure switch that outputs a stop signal when the pressure of the refrigerant in the line 150 exceeds a limit value, 16 is a combustion fan.

The indoor unit U of the gas heating / cooling apparatus A of the refrigerant heating type
As shown in FIG. 3, a temperature setting device 21 for setting a target room temperature, a room temperature sensor 22 for detecting a room temperature, a heating amount calculating means 231 for calculating a heating amount, and an indoor fan for feedback controlling the indoor fan 31 A controller 23 having a control unit 232, a comparison unit 233 for comparing the detected room temperature with the first and second predetermined temperatures (28 ° C./27° C.), a heating amount limiting unit 234, and a communication unit 235 for performing bidirectional communication; A mode setting unit 24 for setting operation modes such as a heating operation and a cooling operation,
A reference voltage output unit 25 that outputs a voltage corresponding to the first and second predetermined temperatures is provided.

The outdoor unit S includes a controller 53 having communication means 531 for performing two-way communication, combustion fan control means 532 for controlling the combustion fan 16, and proportional valve control means 533 for controlling the proportional valve 14. It is arranged.

The compressor 1 is a rotary type having sliding blades, and is driven by a compressor motor (power consumption: about several hundred W to several kW) 101 to which AC-100V is supplied, and is sent from the accumulator 6. Adiabatic compression of the incoming gas refrigerant. The compressor 1 may be of a scroll type or a reciprocating type.

The four-way valve 2 is an electromagnetic valve for switching the flow path of the refrigerant. The flow path of the refrigerant is formed as shown by the arrow in FIG. 1 during the heating operation, and flows as shown by the arrow in FIG. 2 during the cooling operation. A path is formed.

The indoor heat exchanger 3 is a meandering pipe having fins and the like blown by the indoor fan 31, and is disposed in the indoor unit U installed indoors and the outdoor unit S installed outdoors. And a refrigerant pipe. The flow direction of the refrigerant is reversed between the heating operation (in the direction of the arrow in FIG. 1) and the cooling operation (in the direction of the arrow in FIG. 2). The two-way valve 4 is an electromagnetic valve that opens during the heating operation and closes during the cooling operation, and is arranged so that the refrigerant does not flow into the refrigerant heater 5 during the cooling operation.

The refrigerant heater 5 is a heat absorbing tube arranged in a meandering shape. The refrigerant heater 5 is disposed in an outdoor unit (not shown) installed outdoors, and is heated by combustion gas generated by combustion of the gas burner 13. Gas burner 13 ｛3000kcal / h
(Minimum value) to 10000 kcal / h (maximum value)
The gas whose gas amount is set by the proportional valve 14 and the combustion air supplied by the combustion fan 16 are mixed and forcibly burned. The refrigerant is saturated in the pipeline of the refrigerant heater 5. Further, the refrigerant is in a superheated vapor state in the pipeline from the outlet of the refrigerant heater 5 to the accumulator 6.

The accumulator 6 has a straight tubular refrigerant gas inlet pipe and a substantially U-shaped refrigerant gas outlet pipe having an opening at an upper portion in an airtight container. It is arranged in front of the compressor 1 in order to prevent intrusion.

The reference voltage output unit 25 outputs the first predetermined temperature (2
8 ° C.), the reference voltage V corresponding to the second predetermined temperature (27 ° C.)
₁ and V ₂ are output to the comparison unit 233. The comparison unit 233
The voltage V output from the room temperature sensor 22 and the reference voltages V ₁ and V
_2, it is determined whether the detected room temperature is higher than the first predetermined temperature (28 ° C.) and whether the detected room temperature is lower than or equal to the second predetermined temperature (27 ° C.).

The heating amount limiting means 234 detects that the detected room temperature is the first
When the comparing unit 233 determines that the temperature is higher than the predetermined temperature (28 ° C.), the maximum value (maximum heating amount) of the necessary heat amount Q described later is
Limit to 00 kcal / h. If the comparing unit 233 determines that the detected room temperature is equal to or lower than the second predetermined temperature (27 ° C.) during the limitation, the maximum value of the required heat quantity Q described later is set to 10,000 k.
cal / h.

Next, the operation of each part and the change in the state of the refrigerant during the heating operation of the gas cooling / heating device A will be described. Since the compressor 1 adiabatically compresses the gas refrigerant (superheated vapor state) sent from the accumulator 6, the temperature and pressure of the refrigerant increase, and the gas refrigerant (superheated vapor state) changes from the state shown in FIG. Along the state (superheated steam state)
And the enthalpy rises slightly.

The gas refrigerant discharged from the compressor 1 passes through the four-way valve 2 and condenses in the indoor heat exchanger 3 blown by the indoor fan 31 (superheated steam → saturated → supercooled liquid). At this time, the indoor unit U makes the heat generated by condensation into warm air and blows it indoors.

Since the liquid refrigerant flowing out of the indoor heat exchanger 3 is decompressed in the pipeline, it is displaced from the state along the isenthalpy line (on the saturated liquid line) and passes through the two-way valve 4 to heat the refrigerant. The vessel 5 is reached.

The liquid refrigerant (saturated state) evaporates in the refrigerant heater 5 heated by the gas burner 13, and is displaced from the state to a state (superheated vapor state) along an isothermal isobar, and the enthalpy of the refrigerant rises. The refrigerant in the state (superheated vapor state) is sent to the compressor 1 via the accumulator 6.

Next, the operation of the gas cooling / heating apparatus A in the automatic air volume heating operation (first air volume to eighth air volume) will be described. In the mode setting unit 24, the air volume automatic heating operation (with temperature control)
Is set, the heating amount calculating unit 231 sets the temperature setting unit 2
Based on the temperature difference (Tt-Tn) between the target room temperature Tt set in 1 and the detected room temperature Tn detected by the room temperature sensor 22, the indoor heat exchanger 3 performs the refrigerant condensation step (corresponding to the state in FIG. 4 → state). Then, the required heat quantity Q to be released is calculated every predetermined time τ (for example, every minute). The maximum value of the required heat quantity Q is 10,000 kcal / h (detection room temperature Tn ≦ 28 ° C.).
) Or 8000 kcal / h (detection room temperature Tn>
28 ° C).

The indoor fan control means 232 determines the required heat quantity Q
The number of air flow stages (fan rotation speed) of the indoor fan 31 is determined in proportion to the predetermined time τ (for example, every minute), and the indoor fan 31 is feedback-controlled so as to obtain the air flow of the number of stages. Fan airflow = κ · Q (where κ is a coefficient)

The combustion fan control means 532 determines the required heat quantity Q
加熱 Heating amount calculating means 231 by communication means 235, 531
A rotation amount at which a combustion air amount suitable for the combustion amount of the gas burner 13 is output in the refrigerant evaporation step (corresponding to the state from FIG. 4 to the state). The combustion fan 16 is controlled so as to achieve the rotation speed.

The proportional valve control means 533 outputs a heating amount corresponding to the required heat amount Q to the gas burner 13 in the refrigerant evaporation step (corresponding to the state from FIG. 4 to the state) for a predetermined time τ.
Each time, the amount of electricity to the proportional valve 14 is controlled based on the detected rotation speed.

Specifically, the target room temperature Tt and the detection room temperature Tn
In the early stage of the heating operation in which the temperature difference (Tt−Tn) is large,
The indoor fan control means 232 reduces the air volume of the indoor fan 31 to 8
Speed, and the proportional valve control means 533 determines the combustion speed of the gas burner 13 to be 8 speeds (burning amount = 10000 kcal / h). Then, as the time elapses and the temperature difference (Tt−Tn) between the target room temperature Tt and the detected room temperature Tn decreases, the air volume of the indoor fan 31, the air volume of the combustion fan 16, and the combustion speed of the gas burner 13 decrease. It is being done.

However, when the detection room temperature Tn> 28 ° C.,
Since the required heat quantity Q is limited to a maximum of 8000 kcal / h, the air volume of the indoor fan 31 is limited to six speeds, and the combustion speed of the gas burner 13 is limited to six speeds (80,000 kcal / h).

The gas cooling / heating device A of this embodiment has the following advantages. [A] detected room temperature Tn> 28 For ° C. (t ₁ later in FIG. 5)
The required heat quantity Q is reduced by 20% to 8000 kcal / h
And the combustion speed of the gas burner 13 is limited to six speeds (80000 kcal / h), so that an increase in the enthalpy of the entire refrigerant cycle can be suppressed. Thereby, even when the heating operation is performed when the room temperature is high (detection room temperature Tn> 28 ° C.), the increase in the refrigerant pressure is suppressed, and the strength of the pipe such as the pipe 150 is not reduced, so that the safety is excellent.

[A] When the room temperature is high (detection room temperature Tn> 28)
℃), even if the heating operation is performed, the rise in refrigerant pressure is suppressed,
Since the refrigerant pressure in the conduit 150 does not reach the limit value, the pressure switch 15 does not operate, and the heating operation does not stop carelessly (see each curve in FIG. 5).

[C] The heating capacity is increased or decreased by increasing or decreasing the amount of combustion of the gas burner 13 and the number of revolutions of the indoor fan 31 without changing the capacity of the compressor 1. Need not be provided with an inverter circuit for continuously varying. For this reason, it is not necessary to use expensive electronic parts, and it is not necessary to take measures against noise leakage, distortion of power supply waveforms (harmonics), and the like, and the gas cooling and heating apparatus A can be manufactured at low cost.

Next, a second embodiment of the present invention (Claim 2,
3) will be described based on FIGS. 1, 2, 4, and 6. FIG. The refrigerant heating / cooling / heating apparatus B employing the configuration of the present invention differs from the gas cooling / heating apparatus A in the following points.

The heating amount reducing means 236 detects that the detected room temperature is the first
When the comparing unit 233 determines that the temperature is higher than the predetermined temperature (28 ° C.), the necessary heat amount Q calculated by the heating amount calculating unit 231 is reduced by 20.
Reduce by 00 kcal / h. During the restriction, the detection room temperature is
When the comparing unit 233 determines that the temperature is equal to or lower than the predetermined temperature (27 ° C.), the reduction is stopped.

Next, the operation of the gas air conditioner B in the automatic air volume heating operation (1st air volume to 8th air volume) will be described. In the mode setting unit 24, the air volume automatic heating operation (with temperature control)
Is set, the heating amount calculating unit 231 sets the temperature setting unit 2
Based on the temperature difference (Tt-Tn) between the target room temperature Tt set in 1 and the detected room temperature Tn detected by the room temperature sensor 22, the indoor heat exchanger 3 performs the refrigerant condensing step (corresponding to the state from FIG. 4 to the state). The required amount of heat Q to be released is calculated every predetermined time τ (for example, every minute). However, when the calculated required heat amount Q exceeds 10,000 kcal / h, the required heat amount Q is set to 10,000 kcal / h. Further, when the detected room temperature Tn> 28 ° C., the required amount of heat Q is uniformly reduced by 2000 kcal / h by the heating amount reducing means 236.

The indoor fan control means 232 determines the required heat quantity Q
The number of air flow stages (fan rotation speed) of the indoor fan 31 is determined in proportion to the predetermined time τ (for example, every minute), and the indoor fan 31 is feedback-controlled so as to obtain the air flow of the number of stages. Fan airflow = κ · Q (where κ is a coefficient)

The combustion fan control means 532 determines the required heat quantity Q
加熱 Heating amount calculating means 231 by communication means 235, 531
A rotation amount at which a combustion air amount suitable for the combustion amount of the gas burner 13 is output in the refrigerant evaporation step (corresponding to the state from FIG. 4 to the state). The combustion fan 16 is controlled so as to achieve the rotation speed.

The proportional valve control means 533 outputs a heating amount corresponding to the required heat amount Q to the gas burner 13 in the refrigerant evaporation step (corresponding to the state shown in FIG. 4).
Each time, the amount of electricity to the proportional valve 14 is controlled based on the detected rotation speed.

Specifically, the target room temperature Tt and the detection room temperature Tn
In the early stage of the heating operation in which the temperature difference (Tt−Tn) is large,
The indoor fan control means 232 reduces the air volume of the indoor fan 31 to 8
Speed, and the proportional valve control means 533 determines the combustion speed of the gas burner 13 to be 8 speeds (burning amount = 10000 kcal / h). Then, as the time elapses and the temperature difference (Tt−Tn) between the target room temperature Tt and the detected room temperature Tn decreases, the air volume of the indoor fan 31, the air volume of the combustion fan 16, and the combustion speed of the gas burner 13 decrease. It is being done.

However, when the detection room temperature Tn> 28 ° C.,
Since the required heat quantity Q is reduced by 2000 kcal / h, the maximum air volume of the indoor fan 31 is 6 speed, and the maximum combustion speed of the gas burner 13 is 6 speed (80000 kcal / h).

The gas cooling and heating apparatus B of this embodiment has the following advantages. [D] If the detected room temperature Tn> 28 ° C, the required heat quantity Q
Is uniformly reduced by 2000 kcal / h, so that an increase in enthalpy of the entire refrigerant cycle can be suppressed.
Thereby, even when the heating operation is performed when the room temperature is high (detection room temperature Tn> 28 ° C.), the increase in the refrigerant pressure is suppressed, and
Since the strength of the piping such as 50 is not reduced, the safety is excellent.

[E] When the room temperature is high (detection room temperature Tn> 28)
℃), even if the heating operation is performed, the rise in refrigerant pressure is suppressed,
Since the refrigerant pressure in the pipe 150 does not reach the limit value, the pressure switch 15 does not operate, and the heating operation does not stop carelessly.

[F] The heating capacity is increased or decreased by increasing or decreasing the amount of combustion of the gas burner 13 and the number of revolutions of the indoor fan 31 without changing the capacity of the compressor 1. Need not be provided with an inverter circuit for continuously varying. For this reason, it is not necessary to use expensive electronic components, and it is not necessary to take measures against noise leakage, distortion of power supply waveforms (harmonics), and the like, and the gas cooling and heating apparatus B can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a circulation path of a refrigerant when a refrigerant heating type gas cooling and heating apparatus according to first and second embodiments of the present invention performs a heating operation.

FIG. 2 is an explanatory diagram showing a circulation path of a refrigerant when a refrigerant heating type gas cooling and heating apparatus according to the first and second embodiments of the present invention performs a cooling operation.

FIG. 3 is a block diagram of the gas cooling and heating apparatus according to the first embodiment of the present invention.

FIG. 4 (a) is a Mollier diagram showing a state change of a refrigerant used in the gas cooling and heating apparatus according to the first and second embodiments of the present invention, and FIG. 4 (b) is an explanatory diagram thereof.

FIG. 5 is a diagram illustrating an elapsed time t, a heating amount, a pressure, and a temperature when the gas cooling and heating apparatus according to the first embodiment of the present invention performs a heating operation.
It is a graph which shows the relationship with curves, such as suction temperature.

FIG. 6 is a block diagram of a gas cooling and heating apparatus according to a second embodiment of the present invention.

[Explanation of symbols]

A, B Refrigerant heating gas cooling / heating device (refrigerant heating device) 1 Compressor 3 Indoor heat exchanger 5 Refrigerant heater 6 Accumulator 13 Gas burner (heating source) 15 Pressure switch (pressure sensor) 21 Temperature setting device (room temperature) Setting means) 22 Room temperature sensor 23, 53 Controller 31 Indoor fan 234 Heating amount limiting means (Limiting means) 236 Heating amount reducing means (Reducing means) Tn detection room temperature Tt Target room temperature (Setting room temperature)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-107131 (JP, A) JP-A-5-106855 (JP, A) JP-A-56-18225 (JP, A) JP-A-56-107 47937 (JP, A) JP-A 2-96566 (JP, U) JP-A 60-191852 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F24D 7/00

Claims (3)

(57) [Claims] 1. A compressor for compressing a refrigerant, an indoor heat exchanger provided with an indoor fan, a refrigerant heater heated by a heating source, and an accumulator are sequentially connected in a ring-like manner, and exit from the indoor heat exchanger. The refrigerant is sent to the refrigerant heater, the refrigerant is evaporated in the refrigerant heater, and the gas refrigerant discharged from the refrigerant heater is adiabatically compressed by the compressor via the accumulator, and the high temperature discharged from the compressor is discharged. In performing a heating operation in which high-pressure gas refrigerant is condensed in the indoor heat exchanger to radiate heat into the room, based on a difference between a detected room temperature detected by a room temperature sensor and a set room temperature set by room temperature setting means, A controller calculates a target heating amount of the heating source and a target rotation speed of the indoor fan, and heats the heating source at the target heating amount and the indoor fan at a target rotation speed. In a refrigerant heating type heating device that controls the heating source and the indoor fan so that the rotation of the heating source, when the detected room temperature is higher than a predetermined temperature, a limiting means for limiting the maximum heating amount of the heating source is provided. Refrigerant heating type heating device. 2. A compressor for compressing a refrigerant, an indoor heat exchanger provided with an indoor fan, a refrigerant heater heated by a heating source, and an accumulator are sequentially connected in a ring-like manner, and exit from the indoor heat exchanger. The refrigerant is sent to the refrigerant heater, the refrigerant is evaporated in the refrigerant heater, and the gas refrigerant discharged from the refrigerant heater is adiabatically compressed by the compressor via the accumulator, and the high temperature discharged from the compressor is discharged. In performing a heating operation in which high-pressure gas refrigerant is condensed in the indoor heat exchanger to radiate heat into the room, based on a difference between a detected room temperature detected by a room temperature sensor and a set room temperature set by room temperature setting means, A controller calculates a target heating amount of the heating source and a target rotation speed of the indoor fan, and heats the heating source at the target heating amount and the indoor fan at a target rotation speed. In a refrigerant heating type heating device that controls the heating source and the indoor fan so that the rotation of the refrigerant source, a reduction means for reducing the target heating amount when the detected room temperature is higher than a predetermined temperature is provided. Heating system. 3. The refrigerant heating type heating apparatus according to claim 1, wherein a pressure sensor is provided in a pipe downstream of the compressor, and a heating operation is performed when the refrigerant pressure in the pipe reaches a limit value. A refrigerant heating type heating device characterized by stopping the operation.