Reliability Problems of Heat Pumps Outlined




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Reliability has been a top problem ever since heat pumps came into practice. There were a lot of problems which were associated with the device for measuring capillary tube refrigerant. They were not directly associated with the capillary tube itself. The chief concern was the overcharging.

Nowadays the industry of heat pumps is faced with other problems. With the vaster use of higher efficiency unitary systems, there are more thermostatic expansion valves installed than before. They are replacing capillary tubes, and they have their own peculiarities and hence their new issues.

It has been pointed out that when new commercial divided systems are installed, with heat pumps etc., more than half of them are installed with inappropriate refrigerant charge and inappropriate airflow. The consequence is reduced efficiency owing to improper installation. So they do not provide energy savings.

It is true that the reliability of heat pumps has increased massively. That was pointed out in a report which was presented at the International Energy Agency Heat Pump Conference held in 2005. But reliability is connected with the quality of installation of commercial equipment.

Nowadays customers and commercial enterprises are aware of the reliability of heat pumps. They are also aware of the shared current issues which comprise the following. As mentioned above, poor existing installations are among the most shared issues. Another issue involves the sizing of the substitute equipment, because incorrect sizing method there can be no proper operation. in addition another frequent issue is related to the improper calculations of loads. Superheating and subcooling calculations ensure that heat pumps are installed properly and serviced efficiently, to provide the needed reliability.

The problems of installation and substitute is crucial because the reliable operation of new heat pumps is considerably affected by the quality of the substitute system and its kind. For example, older heat pump installations that used to be sized for heating mostly may not be equipped with the proper ductwork to meet cooling requirements.

The air side should receive adequate shares of attention and care. Compared to traditional commercial air conditioners, heat pumps are much more demanding. The heaviest issue with them is the inadequate air flow – on the indoor side. The reason for that can be an undersized ducting system, or a system of poor quality. As a consequence, the indoor unit is not capable of moving the needed amounts of air. That is especially important for heating operation. As a consequence of incorrect airflow, the operation of the system is skewed, and that has a considerably grave effect on refrigeration. Technicians may make the mistake of classifying that problem as a problem with the refrigerant, and not realize that it is a problem with the airflow.

There can also be problems related to duct leakage which can worsen performance and reduce reliability. With older installations, there can be a leakage of approximately 20 percent of the total quantity of air, which reduces the overall efficiency and the airflow to the commercial premises. Usually the ductwork is not easy to reach, so it cannot be changed. But in such situations solutions should be sought which can deal with the problem in the best manner possible. It is best to contact a HVAC specialized, who will be able to resolve your issues and answer all of your questions.




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