JPH0221503B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device used as a hot water supply device, an air conditioning device, or a heating heat source for a greenhouse, etc. The present invention relates to a heat source device using an engine-driven heat pump, which is provided with a condenser that heats the fluid to be heated by heat exchange with the engine, and an exhaust heat recovery device that heats the fluid to be heated with the exhaust heat of the engine.

Such a heat source device using an engine-driven heat pump not only uses the engine as a drive device for the heat pump, but also uses the engine to drive a compressor to apply a moderate and sufficient load to the engine, thereby increasing the engine's own power consumption. This system is designed to make effective use of secondary waste heat and thereby increase the heating efficiency of the heated fluid.
In a device configured to supply low-temperature heated fluid from a heating/cooling system, greenhouse, etc., during steady operation after the temperature of the low-temperature heated fluid has risen to the set temperature or a temperature close to it, the engine Although it is possible to guarantee the heating effect of the heated fluid by the waste heat recovery device by applying a moderate and sufficient load to the At the beginning of operation, when the load is less than 1/2 of the load during operation, the load applied to the engine by the compressor drive is still small, and the amount of heat generated by the engine is small. Since the heating rate itself is slow and the increase in engine load is also rate limiting, the time required to raise the temperature of the heated fluid to the set temperature after the start of operation is long. The drawback was poor start-up performance.

The present invention has an object to overcome such conventional drawbacks.

A heat source device using an engine-driven heat pump according to the present invention includes a first state in which low-temperature heated fluid from a load device is supplied to the condenser without passing through the exhaust heat recovery device; The present invention is characterized in that it is provided with a heated fluid supply control mechanism that can freely switch to a second state in which the high-temperature heated fluid is supplied after heating.

According to such a characteristic configuration of the present invention, the condensing temperature is rapidly increased by switching the control mechanism to the second state in which the high-temperature heated fluid from the exhaust heat recovery device is supplied to the condenser, and the condensation temperature is increased rapidly. The compressor load increases rapidly in proportion to the rise in temperature, and this increase in compressor load also makes it possible to generate enough engine heat, and furthermore, this increase in engine heat generation increases the amount of heat supplied to the condenser. As mentioned above, by rapidly increasing the condensing temperature, it is possible to increase the engine load and further increase the rate of increase in the condensing temperature.

Therefore, according to the present invention, in the initial stage of operation, by switching the heated fluid supply control mechanism to the second state, the load applied to the engine by driving the compressor in a short time after the start of operation, that is, By increasing the amount of heat generated by the engine, it is possible to rapidly raise the temperature of the heated fluid heated by the exhaust heat recovery device to the set temperature, improving the start-up performance of the operation, and at the same time supplying the heated fluid during steady operation. By switching the control mechanism to the first state, an appropriate load is applied to the engine by driving the compressor to heat the fluid to be heated in the exhaust heat recovery device, and the fluid to be heated is also heated in the condenser. The heating fluid can be heated most efficiently.

Embodiments of the present invention will be described below with reference to FIG.

Load equipment A (water heater, air conditioning equipment, greenhouse, etc.)
an engine-driven heat pump B that heats the fluid to be heated (generally water) in the circulating fluid to be heated supply path a; and an exhaust heat recovery device C that heats the prepacked fluid to be heated with the exhaust heat of the engine 1. Together, they form a heat source device.

The heat pump B includes a refrigerant circuit b including a refrigerant compressor 2 driven by the engine 1, a condenser 3 that heats the fluid to be heated by heat exchange with compressed refrigerant, an expansion valve 4, and atmospheric heat. It is constructed by interposing an alternating-shaped evaporator 5.

The condenser 3 and the exhaust heat recovery device C are connected in parallel to the heated fluid supply path a.

The engine 1 is a water-cooled engine.

The exhaust heat recovery device C includes a first heat exchanger 6 that heats the fluid to be heated with the cooling water of the engine 1, and a first heat exchanger 6 that heats the fluid to be heated with the cooling water of the engine 1, and a first heat exchanger 6 that heats the fluid to be heated with the cooling water of the engine 1, and
A second heat exchanger 7 that heats the fluid to be heated with the exhaust gas of the
It is composed of.

8 is a heated fluid supply pump.

Next, a first state in which the low-temperature heated fluid from the load device A is supplied to the waste heat recovery device C and the condenser 3 in parallel, and a first state in which the waste heat recovery device C and the condenser 3 are connected in series. The heated fluid supply control mechanism 9, which can automatically switch to the second state where the heated fluid is circulated and supplied, and its operation will be described. This control mechanism 9 has three on-off valves.
V ₁ , V ₂ , V ₃ , a sensor 9C that detects the temperature of the heated fluid at the inlet of the condenser 3 _, and a sensor 9C that detects the temperature of the heated fluid at the inlet of the condenser ₃ ;
It is equipped with a controller 9B that switches the open/close state of _V3 .

A first state (see Fig. 1) When the temperature detected by the sensor 9C is higher than the set value, the on-off valves _V1 and _V2 are opened by the action of the controller 9B, and the on-off valve _V3 is closed. Cycle like the arrow above. That is, the fluid to be heated discharged from the supply pump 8 is divided into the exhaust heat recovery device C and the condenser 3 side before the on-off valve _V1 , and is supplied to both in parallel and heat exchanged at each location. After that, they are combined and sent to load device A.

(b) Second state (see Figure 2) When the temperature detected by the sensor 9C falls below the set value, the on-off valve V ₁ is activated by the action of the controller 9B.
V ₂ closes, on-off valve V ₃ opens, and the circuit circulates as shown by the dashed arrow on the drawing. That is, the entire amount of the heated fluid discharged from the supply pump 8 first passes through the exhaust heat recovery device C to undergo heat exchange, and the flow path 9A connects the fluid outlet of the exhaust heat recovery device C and the inlet of the condenser 3. The heated fluid is heated in the exhaust heat recovery device C and then further heat exchanged in the condenser 3 before being sent to the load device A.

According to the configuration of the above embodiment, the control mechanism 9 is switched to the second state at the beginning of operation when the heated fluid temperature is below the set value, and during steady operation when the heated fluid temperature is higher than the set value, the control mechanism 9 is switched to the second state. When the mechanism 9 is switched to the first state and in the initial stage of operation, the heated fluid heated by the exhaust heat recovery device C is supplied to the condenser 3, so that the condensation temperature rises. The load applied to the engine 1 by driving the compressor 2 increases, that is, the amount of heat generated by the engine 1 increases. As mentioned above, when the temperature of the heated fluid increases and the condensing temperature rises, the increase in the condensing temperature promotes the increase in the temperature of the heated fluid, and the increase in the temperature of the heated fluid increases the condensing temperature. As a result, the heated fluid temperature rises to the set value in a short time after the start of operation. On the other hand, during steady operation, a moderate load is applied to the engine 1 by driving the compressor 2, and while the fluid to be heated is heated in the exhaust heat recovery device C, the fluid to be heated is also heated in the condenser 3. , the fluid to be heated can be heated efficiently.

In the above embodiment, the temperature of the fluid to be heated at the inlet of the condenser 3 is detected to switch between the first state and the second state. The configuration may be such that a detection sensor is provided to switch between the first state and the second state.

Furthermore, in the embodiment, the heated fluid heated by the condenser 3 and the heated fluid heated by the exhaust heat recovery device C are supplied to the common load device A to constitute one heat source. In the invention, the two heated fluids may be supplied to separate load devices to constitute two heat sources.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

FIG. 1 is a piping system diagram showing the flow in the first state of the present invention, and FIG. 2 is a piping system diagram showing the flow in the second state. 1...Engine, 2...Refrigerant compressor, b...Refrigerant circuit, 3...Condenser, C...Exhaust heat recovery device, A
... Load device, 9 ... Heated fluid supply control mechanism.

Claims (1)

[Scope of Claims] 1. A refrigerant circuit b equipped with a refrigerant compressor 2 driven by the engine 1 is provided with a condenser 3 that heats the fluid to be heated by heat exchange with the compressed refrigerant. In a heat source device using an engine-driven heat pump, which is equipped with an exhaust heat recovery device C that heats a fluid to be heated with the exhaust heat of A heated fluid supply control mechanism 9 is provided that can switch freely between a first state in which the heated fluid is supplied without passing through the fluid and a second state in which the high temperature heated fluid is supplied after being heated by the exhaust heat recovery device C. A heat source device that uses an engine-driven heat pump. 2. When the refrigerant pressure, the refrigerant temperature, or the temperature of the heated fluid supplied to the condenser 3 falls below a set value, the heated fluid supply control mechanism 9 automatically controls the
The heat source device using an engine-driven heat pump according to claim 1, wherein the heat source device is reversibly switched to the second state. 3. The method according to claim 1 or 2, wherein the condenser 3 and the exhaust heat recovery device C are connected in parallel to the heated fluid supply path a to the load device A. A heat source device that uses an engine-driven heat pump.