US 10,539,333 B2Granted

Apparatus and method for heating air at an air treatment device

AssigneeFläKtgroup Sweden AB

InventorJohan Andersson

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Abstract

An air treatment device (1) and a method for heating of aft, in a heating mode, at an air handling unit (2), which comprises a heat recovery device (3). The device further comprises a heat pump (6), comprising an evaporator (7), arranged in a first air stream (4), in the flow direction, after the heat recovery device (3), and a condenser (8) arranged in a second air stream (5), in the flow direction, after the heat recovery device (3). The device further comprises an auxiliary heater (9) for supplying, in addition to the recovered energy, external heat energy. The auxiliary heater (9) is positioned in the first air stream (4), in the flow direction, after the heat recovery device (3) and before the evaporator (7) for heating and thereby the heat pump (6) operation is maintained and a better total efficiency for the plant is achieved.

Claims10

Dependent claims

An air treatment device (1) comprising:

an indoor facing side and an outdoor facing side,
an air handling unit (2) having a first duct and a second duct, each of the first duct and the second duct having an inlet and outlet, and the air handling unit having a controllable heat recovery device (3) which, in a heating mode, being arranged to recover heat energy from a first airstream (4) and transfer the recovered heat energy to a second airstream (5), the first duct conducting the first airstream from the inlet of the first duct on the indoor facing side of the air treatment device to the outlet of the first duct on the outdoor facing side of the air treatment device, and the second duct conducting the second airstream conducting-air from the inlet of the second duct on the outdoor facing side of the air treatment device to the outlet of the second duct on the indoor facing side of the air treatment device, the first and the second air ducts continuously preventing air from passing from the first to the second airstream and from the second airstream to the first airstream,
said air treatment device (1) further comprises a heat pump (6) which, in the heating mode, being arranged to recover the heat energy from the first airstream (4) and transfer the recovered heat energy to the second airstream (5) to heat the air passing to the indoor facing side of the air treatment device via the outlet of the second duct, and the heat pump (6) comprises a condenser (8) and an evaporator (7), the evaporator being arranged in the first airstream (4), in a flow direction of the first airstream, downstream of the heat recovery device (3), and
the condenser (8) being arranged in the second airstream (5), in a flow direction of the second airstream, downstream of the heat recovery device (3),
the air treatment device (1) further comprising an auxiliary heater (9) for supplying the first airstream with external heat energy in addition to the recovered heat energy,
wherein the auxiliary heater (9) is an electric heater (10) and only communicates with the air passing through the first duct from the indoor facing side of the air treatment device, and the auxiliary heater is positioned in the first airstream (4) within the first duct, in the flow direction of the first airstream, downstream of the heat recovery device (3) and upstream of the evaporator (7), and the air treatment device (1) further comprises a control device (21), which is configured to control heating power of the electric heater (10), the recovery of heat energy by the heat recovery device, and operation of the heat pump, and
in the heating mode, the heating power of the electric heater being either increased or decreased by the control device along a substantially continuous power curve such that a certain temperature (T1) of the first airstream between the heat recovery device (3) and the evaporator (7) is maintained.

4 more elements

A method for heating of air in an heating mode of an air treatment device (1), said air treatment device (1) comprises an indoor facing side and an outdoor facing side, an air handling unit (2) having first and second ducts and a controllable heat recovery device (3), for recovering heat energy from a first airstream (4) and transferring the recovered heat energy to a second airstream (5), the first duct conducting the first airstream from the indoor facing side to the outdoor facing side of the air treatment device, and the second duct conducting the second airstream from the outdoor facing side to the indoor facing side of the air treatment device, said air treatment device (1) further comprises a heat pump (6), for recovering heat energy from the first airstream (4) and transferring the recovered heat energy to the second airstream (5), said heat pump (6) comprises an evaporator (7) arranged in the first airstream (4), in a flow direction of the first airstream, downstream of the heat recovery device (3), and a condenser (8) arranged in the second airstream (5), in a flow direction of the second airstream, downstream of the heat recovery device (3), the air treatment device (1) further comprises an auxiliary heater (9) which is positioned to only communicate with air passing through the first duct from the indoor facing side of the air treatment device for supplying the first airstream with external heat energy, in addition to the recovered heat energy, the method comprising:

locating the auxiliary heater (9) in the first airstream (4), in the flow direction of the first airstream, downstream of the heat recovery device (3) and upstream of the evaporator (7) for supplying the external heat energy only to the air passing from the indoor facing side to the outdoor facing side of the air treatment device;
using an electric heater (10) as the auxiliary heater (9);
using a control device (21) as the air treatment device (1) for controlling the electric heater (10),
operating the air treatment device in the heating mode to increase a temperature of the air of the second airstream conducted from the outdoor facing side to the indoor facing side of the air treatment device and
either increasing or decreasing heating power of the electric heater with the control device along a substantially continuous power curve for maintaining a certain temperature (T1) of the first airstream between the heat recovery device (3) and the evaporator (7).

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/032,075Filed 12 Nov 2014
Priority: SE 135140026 Nov 2013
Published: US 2017/0003036 A15 Jan 2017
Granted: 21 Jan 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification22 codes

F24D 12/02
Other central heating systems: having more than one heat source
F24D 5/12
Hot-air central heating systems ; Exhaust gas central heating systems: using heat pumps
F24D 19/1087
For air heating systems: system using a heat pump
F24F 12/001
Use of energy recovery systems in air conditioning, ventilation or screening: with heat-exchange between supplied and exhausted air