{"id":10530,"date":"2014-06-09T15:35:55","date_gmt":"2014-06-09T20:35:55","guid":{"rendered":"http:\/\/www.conservators-converse.org\/?p=10530"},"modified":"2014-06-09T15:35:55","modified_gmt":"2014-06-09T20:35:55","slug":"42nd-annual-meeting-collection-care-hvac-may-31-some-trends-in-examining-six-years-of-utility-and-climate-data-at-the-museum-of-modern-art-by-jim-coddington","status":"publish","type":"post","link":"https:\/\/resources.culturalheritage.org\/conservators-converse\/2014\/06\/09\/42nd-annual-meeting-collection-care-hvac-may-31-some-trends-in-examining-six-years-of-utility-and-climate-data-at-the-museum-of-modern-art-by-jim-coddington\/","title":{"rendered":"42nd Annual Meeting – Collection Care & HVAC, May 31, "Some trends in examining six years of utility and climate data at the Museum of Modern Art" by Jim Coddington"},"content":{"rendered":"

Jim Coddington, the chief conservator at the Museum of Modern Art (MoMA) in New York, \u00a0presented some trends that were found from analyzing the environmental data that was collected at MoMA over the past six years. This was particularly interesting because it compared two relatively new or newly renovated buildings with different types of usage\/functionality and HVAC systems. The building on 53rd street, Jim admits, is very leaky from a number of sources, including the many doors through which thousands of people pass, and has a steam and electric HVAC system. The building in Queens (QNS) on the other hand is mostly concrete with very little glass and has a gas powered HVAC system. The data that Jim presented was collected from across the museum including finance, operation, conservation, and vistor services. Needless to say there are a lot of people invested in this.
\nJim showed mostly graphs and charts. These included data showing the\u00a0temperature and %RH outside, inside the buildings, dew point, and comparing this energy usage. I’ve included images of the graphs that I found most interesting or informative.
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\"NYC<\/a>
NYC average monthly temperature (6 year average) showing periods of cooling and heating inside the QNS building. Most graphs showed what the temperature was at 1 PM each day.<\/figcaption><\/figure>
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\"Indoor<\/a>
This graph shows the indoor RH from fixed outdoor dew point to variable indoor set-point Temperature.<\/figcaption><\/figure>
\nIn QNS there is a\u00a0large expenditures of gas in august and dips in winter. This is because that are able to use free cooling to extract excess heat for 8 or9 months, or 3 out of 4 seasons, through a heat exchanger on the roof. In this process, heat is absorbed from the condenser water by air chilled water. The length of time they are able to use free-cooling is based on set points of T and RH (see second image) and\u00a0is affected by air temperature, relative humidity, and water supply temperature. Non-free cooling with the RH set at 50% happens over the summer and is longer at lower temperatures. So during the summer the temperature set point is allowed to drift to 22 degrees C. Jim mentioned that having a narrower set point may actually equal cost savings, but they have no data for that.
\nOn the analysis for the 53rd street building, Jim highlighted that this is a very different situation. It is a high use building, with lots of leakage points and demand on the systems- steam and electric principally. Therefore, the energy usage is much higher.
\nIt has been asked whether heat from visitors is\u00a0significant? In Chris McGlinchey’s calculation, the 360 kJ\/hr given off by the visitors with a typical stay of\u00a04 hours, this is not a huge contributing factor.
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\"\"<\/a>
The combined energy usage in kJ\/m2 at the 53rd street and QNS buildings.<\/figcaption><\/figure>
\nIn Jim’s summary and conclusions- The expected was stated that they are consuming more energy in the 53rd St building than QNS. This is\u00a0mostly in winter (see the third image). The QNS building is more efficient because of the free cooling, lower set point temperature and equates to lower energy usage thanks to an efficient building design.\u00a0Online Resources:<\/p>\n