Dehumidification, Air Conditioning & Heat Pumps

Latent Degradation Concepts

We have a long history of evaluating the performance of air conditioners and dehumidifiers – including research to understand how this equipment performs under field conditions. We have measured the field performance of these systems as well developed and used detailed research-grade simulation tools to provide understanding and to quantify impacts.

We have also evaluated a broad range of desiccant technologies to provide enhanced dehumidification performance for improved humidity control. We have field tested innovative desiccant systems and have developed detailed simulation tools to predict the performance of these systems.

Example Projects

Energy Efficiency and Cost Assessment of Humidity Control Options for Residential Buildings

Cooling and dehumidification technologies vary in performance depending on a wide range of factors including building characteristics, operating factors, and equipment type. CDH Energy worked with the Building Science Corp. to develop a simulation for ASHRAE to improve understanding of how these factors affect space humidity levels as well as operating costs. The model focuses on single-family homes in humid climates, and it incorporates many variables, including climate, house configuration and efficiency, assumed loads, and the type of cooling and dehumidification equipment used. After verifying the model, CDH Energy used it to compare a variety of situations. Results can be found in the ASHRAE report RP-1449.

Space Cond O  Space Cond

Sensitivity Analysis of Installation Faults on Heat Pump Performance

Quality issues when installing heating, ventilation, and air conditioning (HVAC) equipment can cause the equipment to run at lower efficiencies. These faults—such as improper refrigerant charge, incorrect airflow, oversized equipment, and leaky ducts—exist in typical installations and can waste significant amounts of energy. To understand which installation faults have the most potential to degrade heat pump performance, CDH Energy developed simulations based on building, equipment, and climate effects in a single-family residential house and ran them to find seasonal electricity consumption for various combinations of faults. This work, carried out for the National Institute of Standards and Technology (NIST), is available in the NIST Technical Note 1848.