What is the eComfort 300?

The new Grayson eComfort 300 will provide advanced passenger heating and cooling (HVAC) for electric buses, utilising high-efficiency reversible heat pump technology. Its modular construction means the new range of E-Bus Heat Pump has the option to include Battery Thermal Management System with heat recovery, which minimises waste.

One of the main benefits of the eComfort 300 is the innovative air island distribution for single-deck vehicles, dramatically reducing energy consumption and thermal losses. At Grayson, we offer all customers the flexibility of design and functionality to ensure we meet all system requirements without compromising on performance or quality. The C300 also has the capability to operate in 100% fresh air mode to provide passenger protection from Covid 19.

Future of Thermal Management

Overview

System Benefits

  • Modular system and flexible design.
  • Low installation costs.
  • Lightweight solution.
  • Low power consumption.
  • Low maintenance system.
  • Options for 3 or 5 year service contracts.

System Features

  • Island air distribution removes thermal losses from air being blown through insulated ceiling ducts.
  • Direct hot or cold airflow to passengers.
  • Functionality for simultaneous cooling of batteries and heating of passengers.
  • Optional PTC heating for low ambient conditions.
  • PMW regulated fans offering low noise levels.
  • Optional 100% recirculated air, 100% fresh air or mixed recirculation functionality.

Air Island Distribution

Cooling Mode

  • Cooling mode offers air to air cooling to the passenger saloon via a central air distribution island beneath the evaporator assembly.
  • Option for liquid feed for battery thermal management.
  • Air island incorporates return air from the passenger saloon.
  • Removes the need for insulated ducts to distribute air.

Cooling Mode

 

Heating Mode

  • Direct air to air reversible heat pump to the passenger saloon via a central air distribution island beneath the evaporator assembly.
  • Option for liquid feeds for battery thermal management.
  • Battery cooling and passenger heating are available simultaneously.
  • Removes the need for insulated ducts to distribute air.

Heating Mode

C300 Auxiliary Air Island

Utilising the modular approach to create a lightweight, efficient electric vehicle HVAC, we’ve developed an auxiliary evaporator island which would be used to improve air distribution within the vehicle saloon for passenger comfort.

Connected to the main C300 roof unit, the Auxhillary island avoids unnecessary weight and space claim on the roof of the vehicle, whilst ensuring full functionality of the heat pump components.

Without the need for a localised condenser and fan assembly, the evaporator island provides hot or cold air into the saloon, up to 4m from the central air distribution.

C300 Auxiliary Air Island

Specifications

C300 Model

Weight KG/Ib

Dimensions (MM)

Dimensions (Inches)

Refrigerant Type

Nominal Voltage (V)

Ambient Range °C/°F

Available Passenger Cooling

Available Passenger Heating

High Voltage Amps

Low Voltage Amps

Battery Thermal Management (BTMS)

+PTC Heating Options

C300H ( 400v) Heat only

108 / 238

2230 x 960 x 290

88 x 38 x 11

R407C

400VAC

-5/40 23/104

24kW

82,000 BTU/hr

8

70

X

Yes

C300H ( 600v) Heat only

85 / 187

2230 x 960 x 290

88 x 38 x 11

R407C

600VDC

-5/40 23/104

24kW

82,000 BTU/hr

8

70

X

Yes

C300HB ( 600v) Heat only with BTMS

105 / 231

2230 x 960 x 290

88 x 38 x 11

R407C

600VDC

-5/40 23/104

24kW

82,000 BTU/hr

8

70

X

Yes

C300HC ( 400v) Heat & Cool

115 / 253

2230 x 960 x 290

88 x 38 x 11

R407C

400VAC

-5/40 23/104

14 or 21 kW

47,500 or 71,500 BTU/hr

24kW

82,000 BTU/hr

8

70

X

Yes

C300HC ( 600v) Heat & Cool

90 / 198

2230 x 960 x 290

88 x 38 x 11

R407C

600VDC

-5/40 23/104

14 or 21 kW

47,500 or 71,500 BTU/hr

24kW

82,000 BTU/hr

8

70

X

Yes

C300HCB ( 600v) Heat & Cool with BTMS

125 / 298

2230 x 960 x 290

88 x 38 x 11

R407C

600VDC

-5/40 23/104

14 or 21 kW

47,500 or 71,500 BTU/hr

24kW

82,000 BTU/hr

8

70

Yes

Yes

C300 Auxiliary Island

60 / 132

1200 x 1100 x 300

47 x 43 x 11.8

R407C

N/A

-5/40

23/104

14 or 21 kW

47,500 or 71,500

BTU/hr

24kW

82,000 BTU/hr

N/A

20

N/A

Yes