The Hartman Co.

Principal of The Hartman Co., an HVAC engineering and technology-development firm, Thomas Hartman, PE, is an internationally recognized expert in the field of advanced high-performance building-operation strategies. His accomplishments include development of Hartman Loop, an integrated approach to chiller-plant control that dramatically improves operating efficiencies as plant load decreases; Terminal Regulated Air Volume, a network-based, variable-air-volume control technology that coordinates central-fan-airflow and supply-air-temperature control with actual zone requirements; the Dynamic Control family of software strategies and algorithms, which were among the first to employ integrated strategies to take advantage of microprocessor-based control systems; and the Hartman Energy Valuation System, one of the first hourly building-energy simulation programs.

Reinventing Building Control Networks  3
Our industry’s failure to advance the state of building controls is responsible for the waste of at least 50 percent of the energy applied to comfort systems in typical buildings today. This article explains why building control networks must be improved and outlines the capabilities they must have to meet the ever-increasing demand for improved comfort and efficiency.
Control Freaks: A Path to Low-Energy Buildings 1
Our industry stumbles badly in addressing technical challenges related to the achievement of truly energy-efficient buildings. Analyses show office buildings built today can operate below 10 kWh per square foot annually and do so with simple, straightforward mechanical and electrical systems that are easy to operate and maintain. Yet few buildings are doing that. Why?
The 2009 renovation of the Emprire State Building HVAC system
Control Freaks: Time for New HVAC-System Concepts 3

Over the years, major changes in commercial building heating and cooling load patterns have occurred, but we still design and implement HVAC systems the sae way we have for generations. It's time for a change.

When It Comes to Building Controls Design, It's Important to Get the Little Things RIght 1
Many building control systems fall short of planned performance because commuications beween controls designers and building operators can fall short
Would You Buy a Car Designed and Built the Way Buildings Are?
Would you buy a car designed by one entity, built by another, and proven by a third? That's how our buildings are constructed.
Control Freaks: Tom Hartman on Building Controls
The always-provocative Tom Hartman weighs in with his views on the state of the HVAC building-controls industry.
Getting Past the Building-Performance Brick Wall 2
The challenge of achieving higher-performing buildings is more than any one of the independent entities in the industry can solve. As a result, no solution is developed, and the industry hits a brick wall.
The Wave of the Future: Building-Efficiency Business Plans
Climate change means that U.S. building-efficiency policy is likely to become more strident. Why not build a business model that will benefit from that?
Achieving Success in a Dysfunctional Building-Controls Environment
Here are five steps controls contractors can and should consider to improve the performance of building-control-system projects.
Building-Controls Designers: Conducting the Orchestra
Building-controls and building-automation-system designers can follow four steps to ensure success in creating high-performing buildings.
The Changing Role of Engineers in Building Control
The engineer is key to advancing controls and must become much more involved — just not in the way many are today. In this column I’d like to outline more specifically how I think MEP design firms should think about revamping their role in designing building controls.
Keys to Designing More-Effective Control Systems
Building-control systems are notorious for failing to meet the performance expectations of their designers and operators.
New Strategies for Optimizing Building Performance
For many HVAC design engineers, building controls are an afterthought. Largely because so few engineers have hands-on experience with modern control systems, the design community as a whole tends to think controls are a much simpler component of the HVAC system than they really are. This is reflected in the generally poor quality of typical control-sequence documents and the disjointed process that continues to be employed to implement them.
A New Focus on Building Control Networks
Network capabilities of building control systems historically have lagged behind other networked-based systems. And hardwired connections for each input/output (I/O) point remain the most popular means of connecting end devices to these systems. This needs to change and change quickly. Here are three reasons why.
The Two Futures of HVAC Controls
Two futures are possible for HVAC controls. One is exciting; the other not so much so. In the exciting scenario, controls rapidly evolve so that in just a few years building controls have extensive self-commissioning, self-tuning, self-diagnostic and correction, and even self-configuring features.
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