IT8317709A1 - Heating and air conditioning system with heat recovery via heat pump - Google Patents

Description

DESCRIPTION OF THE INDUSTRIAL INVENTION TITLE "heating-air conditioning system with heat recovery by means of a heat pump"

SUMMARY

A system for heating and air conditioning with heat recovery, characterized by the use of a reversible refrigeration cycle heat pump connected to a hot water generator and an air conditioner, as well as to a network for circulating cold fluid at a substantially constant temperature, to use the heat content of said cold fluid to heat water and the environment in winter; by inverting the refrigeration cycle, in summer the heat extracted from the environment by said air conditioner is used to produce hot water.

DESCRIPTION

The present invention relates to a system for heating and air conditioning environments, with heat recovery by means of a heat pump. More precisely, the invention concerns a system for air conditioning and heating environments, production of hot sanitary water, which allows the use of low-thermal content absorbents as heat sources that would otherwise be wasted, as generally happens in traditional systems. The system according to the invention is characterized by the fact that for heating and air conditioning the environment, an invertible refrigeration cycle heat pump is used, connected to a hot water generator and to an air conditioner as well as to a cold fluid circulation network at a substantially constant temperature, to use the thermal content of said cold fluid to heat the water and the environment in winter; in summer, the inversion of the direction of circulation of the refrigerant fluid allows the heat removed from the environment by said air conditioner to be used to produce hot water. In particular, a closed-cycle flow (water) is provided which can be connected in winter between said heat pump and said generator and air conditioner to transfer to them the heat removed from said cold fluid, while in summer it is connected between said air conditioner and said heat pump to transfer to said generator, through said cold fluid, the heat removed from the environment.

The characteristics and advantages of the system according to the present invention will emerge more clearly from the following description of one of its embodiments, given by way of example and not of limitation with reference to the attached diagram.

With reference to the above diagram, the following is indicated: 1 - VA71 water-to-water heat pump, with reversal of the refrigerant circulation direction by means of a 4-way valve. The electrical power absorbed by the compressor of the above heat pump is 2 HP; the power output is approximately 6500 Kcal/h. 2 - boiler with 10 mm thick polyurethane foam thermal insulation, with a capacity of 200 litres and double exchange, consisting of a coil and an external jacket as shown in the attached drawing. 3 - water-air thermoventilation battery for generating cold and heat in the room. 4 - hydraulic circuit for supplying water from the well to the heat pump. 5 - hydraulic circuit for expelling water either from the heat pump or from the boiler exchange cavities. 6 - hydraulic circuit for inlet from the aqueduct to supply the system. 7- hydraulic circuit or for the use of domestic hot water.

the hydraulic circuit for transporting heat or cold from the heat pump to the boiler and/or to the

fan heater group.

The heat pump bases its operation on

refrigeration cycle. During winter operation

the heat pump transfers 11 absorbed heat

from well water (T =? 13T16?C), through the

evaporator, to the internal environment to be heated, tra-

mild the capacitor. The coefficient of performance

of the pump (?.?.?,), defined as the ratio between

The power output and the power absorbed, ?, under opportup

in conditions, much greater than 1.

In the case of the pump in question the C.O.P. = 5.

This high C.O.P. is possible thanks to the other tempje-

well water supply, even in the winter season

nal. During the summer season the direction of circulation of the refrigerant is reversed.

via a 4-way valve! This way you can exchange

the role between the evaporator and the condenser.

The internal environment is cooled and the heat

subtracted from it is transferred to the pqzr water

zo. In conclusion: 1) in the evaporator in winter

well water enters at T * 13-?-1G?C and exits, at a loss

re, at T =? 8?10?Cj water comes out in the condenser at

T ? 50-r52?C which goes to the user (boiler + fan coil).

Claims (1)

1) Environmental heating-air conditioning system with heat recovery, characterised by the fact that an invertible refrigeration cycle heat pump is used, connected to a hot water generator and to an environmental air conditioner, as well as to a cold fluid circulation network at a substantially constant temperature, to use the thermal content of said cold fluid in order to heat water and the environment in winter; by inverting the refrigeration cycle, in summer the heat removed from the environment by said air conditioner is used to produce hot water. 2) System according to claim 1), comprising - a network for the circulation of cold fluid at a substantially constant temperature; - a hot water generator; an air conditioner a closed-cycle fluid selectively connectable to said generator and to said air conditioner; | - a heat pump in which in winter the refrigerant evaporator is connected to said cold fluid network while heat is released via 2j In summer, well water enters at T = 1-i*a-?$0C and exits at T ? 50?C from the condenser (reverse cycle); water exits the evaporator at T ? 5?-7?C which goes to the fan-assisted coil system for cooling the room. With reference to the drawing of has therefore; A) Winter season: the 3-way solenoid valve is in the A-C position and the 2-way solenoid valve on the system flow line is open. The heat pump supplies both the boiler and the fan-assisted heating system. The exchange with the boiler takes place via the coil; the C.O.P. is approximately 5. The cooled well water is sent directly to the waste water outlet. B) Summer stallion; the 3-way solenoid valve is in position A-B; the 2-way solenoid valve is in position A-B. In these conditions, the internal environment is cooled by the thermo-ventilation unit. The heat extracted from the internal environment is transferred by the heat pump to the well water; this water, which exits at a temperature of approximately 50°C, is sent into the heat exchanger cavity of the boiler to heat the domestic hot water and, therefore, to waste. In this way, the heat extracted from the environment is recovered, resulting in significant energy savings. said closed cycle to the hot water generator and to the air conditioner; in summer, however, the refrigerant evaporator is connected to said closed cycle which extracts heat from the environment via the air conditioner and supplies heat to the generator via said cold fluid. l) System for IX environmental heating-air conditioning with heat recovery substantially as described and illustrated above