Heat Pumps

An air source heat pump (ASHP) is a system which transfers heat from outside to inside a building, or vice versa. Under the principles of vapour compression refrigeration, an ASHP uses a refrigerant system involving a compressor and a condenser to absorb heat at one place and release it at another. They can be used as a space heater or cooler, and are sometimes called "reverse-cycle air conditioners"

• Evaporator
• Compressor
• Condenser
• Expansion valve
• Fan

Function:

Fan draws out side ambient air in to the heat pump and pass through the evaporator coil. In the evaporator coil, the refrigerant can turn liquid to gas at very low temperature. This gas compressed by compressor to elevate the temperature and pressure. Condenser is nothing but tube in tube or tube in shell heat exchanger is made of copper pipe with no welding inside. The internal spiral surface of copper tube ensure effectiveness of heat exchanger. Provision is made for gas as well as water connection.

Heated gas pass through one tube while water passes through the shell. Water gets instantly heated from 15 deg.c to 55 deg.c. Refrigerant gas is condensed and goes to liquid from the same pressure as discharged by compressor. In expansion valve, causes sudden pressure drop in refrigerant, in turn refrigerant temperature drop to temperature below the ambient air. It is ready to receive heat from air. Thus gas cycle complete.

• An Air to Water Heat Pump is up to 4 times more efficient than an electrical heating system.
• In an electrical system: 1 KW of electrical power = 1 KW of Heating.
• In a Heat Pump: 1 KW of electrical power = Up to 5 KW Heating.
• This improved efficiency makes the Heat Pump
• Payback in less than two years.
• The Heat Pump also emits Cool Air which can be ducted and utilized for Space Cooling.

A. Evaporator coil :

Evaporator coil used is of fin and tube type. This fins are hydrophilic treated aluminium fins to resists corrosion and copper tubes are inner grooved type, which increases the heat transfer in the refrigerant side.

B. Water Heat Exchanger (Condenser)

1. High efficiency tube-in-tube heat exchanger for circulating type.

High working pressure :

The copper pipe is of 0.8- 1.2 mm thickness, no welding inside with its extra ordinary pressure resistance property. The copper pipe is without any leakage under 5kg/sq.cm pressure test.

Working Condition

• The internal spiral surface of the copper tube ensures the effectiveness of
• heat exchange and prevent from lubricant accumulation.
• Grooved external surface of the copper tube increases heat transfer area which is 3.7 times of the smooth surface.

C. Compressor:-

• Famous branded rotary compressor for domestic heat pumps.
• Copland or Donfoss scroll type compressor for commercial and industrial heat pump.
• Can work at -25deg.C,low noise, long life and long working time design.

D. Pumps:-

• Domestic range are supplied with built-in circulation pump, heat pump
• supply with German Willo pumps as a standard supply.

E. Expansion Valve:-

• Thermal expansion wall(TEV) is used for domestic range.
• Alco(Emerson) or Donfoss thermal expansion wall(TEV) is used for commercial range.

F. Intelligent Control:-

The units are supplied with microprocessor based digital controller with LCD display. The control is programmed to provide maximum protection to the heat pump system and accurate temperature control. The control panel is completely fixed and cabled at manufacturing unit and supplied along with all accessories.

Domestic Heat pump circulating model adopts high efficiency tube – in – tube water heat exchanger and incorporate a built in German Willo pump and for every installation. The unit is capable of producing hot water with a maximum temperature up to 55 deg.c It can retrofit to existing solar water heater tank or electrical geyser to replace electric water heater. save more than 2/3 energy.

Features and High lights of Heat pump (Circulating Model)

• High Efficiency rotary & scroll compressor
• High efficiency eco-friendly R134A, R417A or R407C refrigerant without ozone depletion.
• Immediate hot water production.
• Built in German Willo circulation water pump.
• Intelligent microprocessor based controller with LCD display.
• Adjustable water temperature setting : 25 – 60 deg,c
• Tube – in – tube water heat exchanger with a maximum water pressure up to 2.5 kg/sq.cm.
• Thermal expansion valve (TEV) for expansion with reliability and high precession.
• Inner grooved copper tube for higher efficiency.
• Blue hydrophilic aluminium fin to resist the corrosion.
• Automatic defrosting function included
• Can be retrofit the existing geyser and used in conjunction with solar hot water system.
• Easy installation & maintenance.
• Heat pump work all through the year including monsoon and winter.

Domestic Hot water Heat pump ( circulating Model)

Technical specification