65kW central air conditioner

central air conditioner. cooling: 52kW to 130kW CE,CCC,ISO9001,ISO14001

Air source and water source heat pumps

Domestic or commercial applications

Best quality and price competitive.

ISO9001 and ISO14001 Certified factory

With Full heat pumps Production Line Workshop

Technical background heat pump R&D Team and Skillful Workers

National standard Testing Laboratory to ensure quality.  

SIMULTANEOUS DEMAND FOR BOTH HEATING AND COOLING

The following are some typical applications where both heating and cooling energy demands exist:

Gymnasium – hot water for showers and air conditioning for activity areas.Sauna – hot water for sauna and air conditioning for reception counters.Swimming Pool – heating for pool water and cooling or dehumidification for ancillary areas.Hair Salon – hot water for shampoo and air conditioning for salon.Club House of Housing Estate – hot water provision for various activities and air conditioning for indoor areas.Catering – hot water for catering services and air-conditioning for dinning, servicing areas or kitchen.Hospital – hot water for pre-heating in steam generation, for bathing patients, cleansing and cooling supplementing central air-conditioningFoot Massage – hot water for message and cooling for venue. 

DEMAND FOR HEATING ONLY

The followings are some typical heating applications where heat pumps can be used:

Boilers – heat pumps can be used to generate the hot water direct or serve for pre-heating efficiently of a boiler system for hot water or steam generation.Laundry – Laundry plants consume large amount of hot water and heat pumps can meet the demands efficiently. 

Heat pump is a machine that would extract heat energy from a relatively cool medium (the heat source) and transfer it to a relatively hot medium (the heat sink) to make the cool medium cooler and the hot medium hotter. This is comparable to a machine producing two effects, one for heating and the other for cooling.

Moreover, heat pump is an energy efficient machine to provide heating and cooling in many applications. Normally, for one unit of electrical energy supplied to the heat pump, it would produce more than one unit of heating energy as well as more than one unit of cooling energy. This is far more efficient than other heating processes which normally produce less than one unit of heating energy due to losses.

The efficiency of heat pump will be superb in applications where both heating and cooling are required simultaneously so that heat energy and cooling energy from the heat pump could be fully utilized.

  

1 Heat Pump Cycle

Like refrigeration machines, most heat pumps operate on either a vapor compression or an absorption cycle. Electrically driven heat pumps normally operate on the former cycle. It has an electrical compressor that circulates refrigerant between a condenser and an evaporator. At the condenser, heat energy is released when vapor refrigerant is condensed to liquid phase, while at the evaporator, heat energy is extracted (in other words, cool energy is produced) as the liquid refrigerant is vaporized.

2. Operation Efficiency – Coefficient of Performance

The amount of heat energy and cool energy produced at the condenser and evaporator respectively depends on a number of factors such as temperature of the media surrounding the condenser and evaporator, type of refrigerant, and working pressure of refrigerant vapor entering the condenser.

For electrically driven heat pumps, the coefficient of performance (COP) which is the ratio of thermal energy output from a heat pump to electrical energy input to its compressor, an operation efficiency indicator for the heat pump. Energy output of a heat pump depends on how one utilizes its heat and cool energy output. For heating only applications, the COP is the ratio of the heat energy output to the electrical energy input. For applications that utilize both heat and cool energy, the COP is the ratio of the total heat and cool energy output to the electrical energy input, and would be higher as shown in the equation below:

COP=COP(heating) + COP(cooling)=(E(heat)+E(cool))/E(electrical)

Theoretically by definition, COP(heating) is greater than COP(cooling) by 1. It is because heat energy delivered by a heat pump is the sum of the heat energy extracted from the heat source at the evaporator and energy to drive the compressor.

Generally, heat pump can achieve a COP(heating) of 3 and the corresponding COP(cooling) would be around 2, Hence, the overall COP of a heat pump for both heating and cooling can be up to around 5.

1 Air to Water

Air-to –water heat pumps are those which extract heat energy from ambient air (the heat source) and reject it to water media (the heat sink). This type is quite common as cool air and hot water so produced are more versatile in applications. For instance, an air-to-water heat pump installed for kitchen, where the environment is hot, can provide spot cooling to occupants as well as hot water for catering service efficiently.

The temperature of hot water that can be produced by a heat pump depends on the refrigerant and the temperature of the heat source. Conventional heat pumps are designed to be efficient for generating water of around 40 degree. For water temperature as high as 90 degree, it can be produced by heat pumps that use carbon dioxide as refrigerant, however, the main concern in using CO2 heat pump is the extremely high working pressure(around 4 to 5 times higher than conventional refrigerants).

Direct type heat pump using conventional refrigerant (i.e. normal refrigerant pressure) for producing adequate flow of higher temperature water. Such heat pump can be regarded as instantaneous water heater and the hot water storage may be eliminated.

2. Water-to-Water

Water-to-Water heat pump can be employed to generate hot water for venues with central air-conditioning. The cool water output can be deployed via heat exchanger to the chilled water return circuit of the central air-conditioning plant to save plant energy. The heat pump COP, however, may not be at optimum as heat is extracted from the chilled water of the central A/C plant which is a cool medium. 

65kW central air conditioner